We supply precision mold ejector pins for plastic mold & die casting

  • Standard sizes have a big stock and can send out in the same day. The customized type is available upon request.
  • Follow DIN, JIS, AISI Standard.
  • Metric ejector pins or Inch ejector pin size are available.
  • Standard material: SKD61, SKH51, 1.2344, 1.2210, H13. SKD61, Other material is optional upon request.
  • Hardened and Nitrided are regular types. Surface polish, black oxidized, DLC coated, TiN coated is available.
Mold Ejector Pins Supplier, Straight Ejector Pin, Blade Ejector Pin

For over 18 years, DEK has been one of the leading ejector pins suppliers in the world. Whether you need a short run of complex ejector pins, or simply need the standard sizes ejector pins, our production line can meet your needs.

Our standard size ejector pins are produced by the automatic machine with tight tolerances, the special or customized type will be produced by our experienced machinists with manual equipment. Our experienced machinists are equipped to quickly and accurately set up even your most complex jobs and deliver them on time, with the quality you expect.

Mold Ejector Pin, Blade Ejector Pin, Stepped Ejector Pin, Injector Pin
Product list

Straight Ejector Pins

DEK offers a full line of Striahgt Ejector Pins which includes Nitrided and Hardnned Throughtout types. All are 100% meet JIS, DIN and AISI Standards. Both inch and metric sizes are available.

JIS MISUMI PUNCH EJECTOR PINS, SKD61 EJECTOR PIN, DIN 1530
A-1001
  • Standard: JIS
  • Material: SKD61
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Vacuumed + Nitrided
JIS MISUMI PUNCH EJECTOR PINS, SKD61 EJECTOR PIN, DIN 1530
A-1002
  • Standard: JIS
  • Material: SKH51
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout
DIN 1530A Ejector Pin
A-1003
  • Standard: DIN 1530
  • Material: 1.2344
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Nitrided
JIS MISUMI PUNCH EJECTOR PINS, SKD61 EJECTOR PIN, DIN 1530
A-1004
  • Standard: DIN 1530
  • Material: 1.2510
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout
JIS MISUMI PUNCH EJECTOR PINS, SKD61 EJECTOR PIN, DIN 1530
A-1005
  • Standard: AISI
  • Material: H13
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Nitrided
JIS MISUMI PUNCH EJECTOR PINS, SKD61 EJECTOR PIN, DIN 1530
A-1006
  • Standard: AISI
  • Material: M2
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout

Blade Ejector Pins / Flat Ejector Pins

You can get any specifics of blade ejector pins with a short time. These flat ejector pins are 100% processed according to the drawing, which will never affect the use of the injection mold.

Ejector-Blade-Supplier.jpg
A-1101
  • Standard: JIS
  • Material: SKD61
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Vacuumed + Nitrided
Ejector-Blade-Supplier.jpg
A-1102
  • Standard: JIS
  • Material: SKH51
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout
Blade Ejector Pin, Flat Ejector Pin
A-1103
  • Standard: DIN 1530
  • Material: 1.2344
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Nitrided
Ejector-Blade-Supplier.jpg
A-1104
  • Standard: DIN 1530
  • Material: 1.2510
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout
Ejector-Blade-Supplier.jpg
A-1105
  • Standard: AISI
  • Material: H13
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Nitrided
Ejector-Blade-Supplier.jpg
A-1106
  • Standard: AISI
  • Material: M2
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout

Stepped Ejector Pin / Shoulder Ejector Pin

You can get any type of stepped ejector pins here, with a bottom price and faster delivery. Diameter from φ1.0 to φ40 mm, length from 63mm to 1250mm is available.

Stepped Ejector Pin, Shoulder Ejector Pin
A-1201
  • Standard: JIS
  • Material: SKD61
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Vacuumed + Nitrided
Stepped Ejector Pin, Shoulder Ejector Pin
A-1202
  • Standard: JIS
  • Material: SKH51
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout
DIN 1530 C Stepped Ejector Pin
A-1203
  • Standard: DIN 16756
  • Material: 1.2344
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Nitrided
Stepped Ejector Pin, Shoulder Ejector Pin
A-1204
  • Standard: DIN 16756
  • Material: 1.2510
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout
Stepped Ejector Pin, Shoulder Ejector Pin
A-1205
  • Standard: AISI
  • Material: H13
  • Inner Hardness: HRC48-52°
  • Sufrace Hardness: HV900-1100°
  • Type: Nitrided
Stepped Ejector Pin, Shoulder Ejector Pin
A-1206
  • Standard: AISI
  • Material: M2
  • Inner Hardness: HRC58-62°
  • Surface Hardness: HRC58-62°
  • Type: Hardened Throughout

Custom Made Special Pins

In addition to the standard sizes ejector pin, we can produce a variety of special injector pins. Such as special shape processing, coating, or made of stainless steel, etc.
DLC Coating Ejector PIN, Coated Ejector Pins
DLC Coated Ejector Pin
  • DLC Coating.
  • Any material, any size, any length.
  • Metric or inch size is available.
TIN Coating Ejector PIN, Coated Ejector Pins
TiN Coated Ejector Pin
  • TiN Coating.
  • Any material, any size, any length.
  • Metric or inch size is available.
Stainless Steel Ejector Pin
Stainless Steel Ejector Pin
  • Made of Stainless Steel.
  • Any material, any size, any length.
  • Metric or inch size is available.
Copper BECU Ejector Pin
BeCu Ejector Pin
  • Made of BeCu copper.
  • Any material, any size, any length.
  • Metric or inch size is available.

Contact For Your Next Ejector Pins

Looking for a professional supplier, who can provide precise mold components and efficient services? Contact us now! Find out why more than 2300 factories choose us as their best supplier.
our BENEFITS

Why DEK is Your Best Ejector Pins Supplier

Ultra Precision

The precision of the ejector pin directly affects the quality of plastic parts. DEK can produce ultra-precision ejector pins to meet your special precision molds, such as the OD tolerance we can meet ±0.001mm.

Rapid delivery

For the standard size ejector pins, we have several million in stock and can be shipped in the same day of place an order. For unconventional ejector pins, customized production is required, but it can also be shipped within 3-7 days without delaying your mold delivery.

Custom Finishes

You can get a variety of different heat treatment and surface treatment of ejector pins to meet the needs of different molds, including nitrided type, hardened type, surface polishing type, black oxidized type, TiN coated, DLC coated, etc.

Material Selection

Different materials are suitable for different injection molds. We usually use SKD61, SKH51, 1.2344, 1.2510, H13, M2 materials. Other materials such as SUJ2, stainless steel, and beryllium copper is available upon request.

Cost Effective

We have automated production equipment and mature production technology, which ensures that our prices are significantly lower than those produced in other suppliers.

stable quality

In the injection molding, the most fear is that the damage of the mold parts will lead to the stop of the work. By improving the craftsmanship and precision of our products, we ensure the high durability of our thimble, which can reach 1 million ejections.

If you are looking for precision ejector pins, please feel free to contact us, you will get our response in a short time.

Request A Quote

Please fill up below form, you will get our response within 6 hours.

Mold Ejector Pins: The Ultimate Guide

DEK has prepared an Authoritative Guide for mold designers and engineers in the mold industry here, and comprehensively explains mold ejector pins. Whether you are an experienced engineer or a newcomer, this guide is very useful.
Ejector Pin 1

Chapter 1:
What is Mold Ejector Pins?

Mold ejector pin is a “bouncing device” in injection molding and die casting industry. They apply force to eject the part from the mold, leaving a mark in some cases.

The ejector pin is located in half of the mold on the B side, and the part stays on that side when the mold is opened. When the mold is opened, the pin extends into the mold cavity, pushes the part out, and then retracts so that the mold is closed and refilled.

Chapter 2:
The types of ejector pins

According to different shapes, the ejector pins can be divided into 4 different types: Straight, Blade, Stepped and speical types.

2.1 Straight Ejector Pin

Straight Ejector Pins

The straight ejector is called cylinder ejector pin also. As the name implies, the effective part is the cylinder body. This type is the most commonly used to injection mold and die casting mold.

2.2 Blade Ejector Pin

blade ejector pins supplier, ejector blade
Blade Ejector pin is called flat ejector pin too. It is mainly used for ejecting the rib part of plastic products, and rectangle plastic position. When the cylinder pin can not be set down, the flat ejector pin can do it.

2.3 Stepped Ejector Pin

stepped Ejector Pins

Stepped Ejector pin, called shoulder ejector pin too, used in the second processing on the basis of a straight ejector pin. It has two circular cylinders. Generally used in small and precision plastic molds.

2.4 Customized Ejector Pin

BECU Ejector Pins

Besides, there are many kinds of specialized ejector pin. In order to meet the demand functions in a special position, it needs to process by different artworks. For example, allotype in the head part, specially processed tail, used with beryllium copper or stainless steel, etc. That’s why called customized ejector pin.

Chapter 3:
What Are The International Standards For Ejector Pin?

A long time ago, several kinds of standard ejector pin sizes were developed in the world. Through standardization, the production cost and mold cost can be greatly reduced.

Now there are 3 standards usually used in the world, namely DIN, JIS, and AISI.

3.1 DIN Standard

DIN is short for Deutsches Institut für Normung, created in Germany. DIN 1530 is commonly used in European countries and districts. Generally, it is Metric size and the popular materials are 1.234, 1.2210, and 1.2510, ect.

3.2 JIS Standard

JIS is short for Japanese Industrial Standards, created in Japan. JIS is commonly used in Asian countries and districts. Generally, it is Metric size and the popular materials are SKD61, and SKH51, etc.

3.3 AISI Standard

AISI is short for the American Iron and Steel Institute, created in America. Generally, it is Inch size and the popular materials are H13, O2, and M2, ect.

ejector pin material

Chapter 4:
The Meterial of ejector pins

Because the injection pins need to bear strong force and fast friction, so not all kinds of steel can be used. The following are common materials for making ejector pins in the world

4.1 The Material of JIS Standard Ejector Pins

SKD61

Customers would prefer SKH51 than SKD61 if the hardness required higher. SHK51 has the same advantages of SKD61, besides. SHK51 is better than SKD61 in toughness and hardness. However, most customers would like to buy SKD61 because, in many occasions, SKD61 can meet the demand for mold, and its material cost quite lower than SKH51.

SKH51

Customers would prefer SKH51 than SKD61 if the hardness required higher. SHK51 has the same advantages of SKD61, besides. SHK51 is better than SKD61 in toughness and hardness. However, most customers would like to buy SKD61 because, in many occasions, SKD61 can meet the demand for mold, and its material cost quite lower than SKH51.

65mn

65mn is spring steel with a certain degree of flexibility and plasticity. The fatigue limit is equivalent to that of multi-colored alloy springs, but the hardenability is worse, so to be used in small spring. 20 years ago, it was popular in the China market at the very beginning for the cheaper material cost. 65Mn ejector pin is easy to break because of poor quality. Therefore, there is less use for molding. However, with the cheaper price than that of SKD61, some dishonest suppliers disguise 65Mn as SKD61 to make a huge profit. Not to be fooled, you’d better require suppliers to provide material test reports when you are going to purchase the ejector pin.

4.2 The Material of DIN Standard Ejector Pins

1.2344

1.2344 is similar to SKD61. This steel has the advantages: after electro slag remelting, it is uniform, good hardenability, and has excellent machining and polishing performance, high toughness, and plasticity. With higher and lower temperature wear resistance, helps it can be done in high-temperature fatigue resistance and heat resistance conditions.

1.2510

1.2510, this steel is an oil hardening tool steel supplied in the annealed condition. It offers good durability, gives excellent wear resistance and holds a good cutting edge. With these properties, this tool steel 1.2510 is an excellent general purpose grade often used where the expense of a high carbon high chromium tool steel would not be justified.

4.3 The Material of AISI Standard Ejector Pins

H13

H13 is the most widely used and representative hot work steel, with the below advantages:

    1. It has high hardenability and toughness.
    2. It can be water-cooled in the workplace because of great thermal crack resistance.
    3. With medium wear resistance, the surface hardness can also be improved by carburizing or nitriding, but the thermal cracking resistance should be slightly reduced.
    4. Because of its low carbon content, the secondary hardening ability is not so good during tempering.
    5. It has the anti-softening ability at higher temperatures. If over 540 ℃(1000°F), the hardness decreases rapidly. That means it can work under 540 ℃.
    6. Little change the shape during heat treatment.
    7. It supports medium and high machinability.
    8. It has medium decarburization resistance.
    9. More noticeable is that it can also be used to make important components in the aviation industry.
M2

M2 is the “standard” and most widely used industrial HSS. It has small and evenly distributed carbides giving high wear resistance, though its decarburization sensitivity is a little bit high. After heat treatment, its hardness is the same as T1, but its bending strength can reach 4700 MPa, and its toughness and thermo-plasticity are higher than T1 by 50%. It is usually used to manufacture a variety of tools, such as drill bits, taps and reamers. 1.3343 is the equivalent numeric designation for M2 material identified in ISO 4957.

ejector pin heat treatment

Chapter 5:
Heat Treatment of Ejector Pins

Heat treatment is a kind of metal thermal processing technology that controls the improvement of material properties by changing the metallographic structure on the surface or inside of the material by heating, holding and cooling the metal material in a certain medium. Here are two methods for reference.

5.1 Nitriding

Nitriding is a chemical heat treatment process, which can infiltrate nitrogen atoms into the surface of the workpiece through a medium at a certain temperature, and the ejector pin after nitriding, will produce a wonderful effect and will have better resistance than before, abrasion resistance, fatigue resistance, corrosion resistance, and high-temperature resistance. The nitriding treatment method mainly uses a nitriding furnace, puts the workpiece into the material frame, and then uses the crane to lift the workpiece and heat it at the bottom of the furnace.

The ejector pin has the following advantages after nitriding:

  • Durability: After nitriding, the ejector pin has greatly improved wear resistance and fatigue resistance. This is more durable than ordinary ones, saving your costs.
  • Corrosion resistance: After nitriding, the corrosion resistance can be improved, and rust will not be caused by environmental factors, which helps you to easier to keep stock.
  • High-temperature resistance: After nitriding, the high-temperature resistance of the mold ejector pin is strengthened, which is the most important processing. We often use ejector pin in injection molds, which are generally processed at high temperatures. The workpiece may reach hundreds of degrees or even thousands of degrees. The ordinary ejector pins have been working in this high-temperature environment. If not resistant to high temperatures, they will be easily bending.

5.2 Vacuum + Nitriding

Vacuum + nitriding heat treatment is one of the more advanced methods in heat treatment. Vacuum high pressure gas quenching furnace is the ideal equipment for vacuum heat treatment. The vacuum furnace has the effects of no decarburization, no oxidation, uniform temperature, controllable heating and cooling speed, and can realize different processes. The vacuum furnace is internationally recognized as “green heat treatment” because it has no pollution.

Vacuum heat treated SKD61 injector pins refers to all and part of the heat treatment process performed under vacuum. Compared with conventional heat treatment, the vacuum heat-treated SKD61 injector pin can achieve no oxidation, no decarburization, and no carburization, and can remove phosphorus debris on the surface of the workpiece. It has the degreasing and degassing effects, so as to achieve the effect of bright surface purification. The main applications of vacuum heat treatment are vacuum oil cooling quenching, vacuum air cooling quenching, and vacuum tempering. In order to maintain the excellent characteristics of SKD61 ejector pin vacuum heating, the choice and formulation of coolant and cooling processes are very important. The quenching process is mainly oil-cooled and air-cooled. It can improve mechanical properties related to surface quality, such as fatigue performance, surface brightness, corrosion resistance, etc.

Chapter 6:
The Important Factors That Influences Life of Ejector Pin

6.1 Toughness

Usually, the working conditions of the mold are very harsh and rigorous, some of them bear large impact loads, resulting in brittle fracture or bending. In order to prevent the mold from interrupting production suddenly during work, the ejector pin must require high strength and toughness, which depends on the carbon content, grain size, and microstructure of the material.

6.2 Abrasion Resistance

When the ejector pin is working in a plastic mold, it is continuously ejected and retracted inside the mold, causing severe friction between the ejector pin surface and the inner hole of the mold, which causes the mold to fail due to wear and tear. Therefore, the wear resistance of the ejector pin is one of the basic and vital properties of the mold.

6.3 Fatigue Fracture Performance

During the working process, under the long-term effect of cyclic stress, it often causes fatigue fracture. Its forms are small energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture.

Chapter 7:
Why The Ejector Pin Needs coating?

Mold Components With DLC Coating

To increase the durability and life of the ejector pin, or to meet the demands of special occasions, the surface of the ejector pin needs coating, such as black oxidation, DLC coating, TiN coating, etc.

7.1 The Kinds of Coating

Black Oxidation
Black Oxidation ejector pin for injection mold die casting

Treatment is a common method of chemical surface treatment. The principle is to produce an oxide film on the metal surface to isolate the air and achieve rust prevention. This is often be used in European countries’ markets.

The oxidized nitrided ejector pin is produced with hot working tool steel, nitrided and it can be used to eject molded parts out of die casting and injection mold tools. After the plasma nitration, the ejector pin is provided with an antioxidant coating. This guarantees that the ejector pin has excellent performance characteristics on dry running and has a high corrosion resistance thanks to the oxidized surface. The antioxidant coat of the nitride ejector pins has been specially intended for the requirements of the ejector pins, in close collaboration with specialized heat treatment companies.

DLC Coating
DLC Coated EJECTOP PIN FOR PLASTIC MOLD DIE CASTING

DLC Coating is short for DIAMOND-LIKE CARBON. DLC is a substance composed of carbon, similar in nature to diamond, and having a structure composed of graphite atoms. Diamond-like carbon film (DLC) is an amorphous film. Due to its high hardness and high modulus of elasticity, low friction coefficient, wear resistance and good vacuum tribological properties, it is very suitable for wear-resistant coatings.

DLC has below advantages:

  1. High hardness: It reaches HV2000 and is wear-resistant.
  2. Anti-friction: Not only the DLC coating has super abrasion resistance, but also has a very low coefficient of friction, which is generally lower than 0.2. The data varies with different preparation processes and changes in the composition of the film. It can be as low as 0.005 and achieve oil-free lubrication.
  3. Anti-corrosion. DLC coating has excellent corrosion resistance, it is difficult for various acids or alkalis to damage it.
TiN Coating
TIN Coated ejector pin supplier for injection mold die casting injector pin

TiN Coating is short for Titanium Nitride. This is a synthetic ceramic material with the hardness closed to diamond, extremely hard.

7.2 The Characteristics Of Coating Ejector Pin

The coating ejector has the advantages of high hardness and low coefficient of friction, which play a significant role in improving wear resistance, production efficiency and product quality.

Besides, it helps improve corrosion resistance: When engineering plastics are going to be formed, a large amount of gas is generated, and the DLC coating can protect ejector pin from being corroded.

7.3 What Circumstances Should Be Used Coating Ejector Pin?

  1. For plastic molds with quickly forming cycle or long service life.
  2. For the molds that cannot use lubricants, such as medical service molds.
  3. For the molds that use gas-prone materials, such as engineering plastics and glass fiber resins.
  4. For the molds that the ejector pin easily to be wear and tear, such as die-casting molds.
  5. For the molds that require high abrasion resistance, mold release, and corrosion resistance.
How to buy ejector pins

Chapter 8:
How To Choose Ejector Pin For Your Mold?

8.1 According to the Working Temperature

  1. When the working place is under 200℃:The design of the through hard pins involves the same hardness throughout the diameter of the ejector pin. With this characteristic, the ejector pin can last much longer in working temperatures below 200oC. It is mainly suitable for plastic injection molds.
  2. When the working place is over 200°C :If the working temperature goes beyond 200℃, then nitride H13 pins will be a much better fit. The reason is that the surface of these pin has a hardness of HRC 65 to 70, which can lead to a much better life expectancy in high working temperatures. These pins are best for die casting.
  3. When the working place is over 600℃:Nitride H13 pins are not suitable for working temperatures that exceed 600℃, so black ejector pins were developed as an option. These pins have a special black surface coating treatment on the entire pin that can sustain working temperatures up to 1,000℃. Also, the special black surface treatment provides additional self lubrication to the ejector pin, making it an excellent fit for automobile injection molding. These pins are suitable for most working temperatures, but the cost of such a pin is higher.

8.2 According To The kind of Mold

For Injection Mold
For plastic injection mold, according to its precision and production capacity.
  1. Lower capacity, the lower requirement: the request of molding is not high, within 100 thousand times. You can choose the ordinary ejector pins.
  2. Medium capacity, the medium requirement: the request of molding is within 100-500 thousand times. The suggestion is vacuumed and through hardness ejector pins
  3. Higher capacity, higher requirement;the request of molding is within 0.5-1 million times. The suggestion is vacuumed and nitrided ejector pins or SHK51 ejector pins that are high-speed steel vacuumed and through hardness.– For die casting mold. It requires a strong force on the ejector pin. A smart choice is DLC coating, TiCN coating ejector pins. In addition to, tungsten steel material can not miss out.
For Die Casting

For die casting mold. It requires a strong force on the ejector pin. A smart choice is DLC coating, TiCN coating ejector pins. In addition to, tungsten steel material can not miss out.

Chapter 9:
6 Ways Will help you find the best Ejector Pins Supplier

9.1 Production Technology

Although the production technology of the ejector pin is in a maturity stage, it still requires high precision for tolerance. Without rich skills, quality is hard to control well. It’s better to choose an over 15 years of production experience manufacturer because his quality and credit have been proven by numerous customers.

9.2 Ability of Quality Control

An ejector pin is a precision product, not an ordinary daily necessities. That means every piece ejector pin has to be produced following the requirement. A quality stable supplier requires tests and checks per piece ejector pin. You might inspect your supplier’s factory, if less than 15 workers in the QC department, it is impossible to check one by one.

9.3 Delivery on time

It’s well-known to us, time is money. Delivery on time is vital for the molding. An excellent ejector pin supplier must have the ability to fast production and hand over goods on time.

9.4 Customized Service

Due to the ejector pin are requested specialized, it has to source a supplier that can provide you customized service, including the time of quotation, the ability of designing and time of production.

9.5 One-Stop Service

As ejector pin usually needs to be done blade ejector pin, stepped ejector pin, and it has different standards and material, so if you cooperate with a one-stop supplier, you would save more than 80% time and energy.

In addition, if your supplier can supply core pins, ejector sleeve, guide pin, guide bush etc, then I believe your business will develop more quickly.

9.6 Price

Finally, let’s talk about the price. Most clients would regard the price as the first factor, while personally, it is not as important as the previous factors mentioned above, because its price is very positive in markets. If still focus on lower price blindly and order the improper material with inaccurate tolerances, the mold downtime loss caused on the working is more often greater.

Summary

With the help of 6 ways as above, you would source a valuable supplier as soon as possible. Here you could check DEK mold that over 19 years of production experience, has long-term cooperation with Midea, Foxconn, and other big companies. You will get our support by stable quality and competitive price. Welcome to contact us.

Chapter 10:
These 17 questions may help you, If you’re experiencing ejector pin breakage.

  1. What is the application? Are the pins supporting or ejecting?
  2. Is the mold design balanced (symmetrical)?
  3. How much of the working pin length is being used for ejection stroke vs. overall ejection stroke designed for the mold?
  4. How much of the ejector pin ‘working’ area is supported?
  5. Is guided ejection being employed within the ejector assembly?
  6. Is the ejector plate assembly experiencing deflection?
  7. Is the ejector pin experiencing deflection during injection or ejection?
  8. How is the ejector assembly returned? Springs, early ejector returns, return pins, press pull-backs, homemade method?
  9. What is the clearance around the ‘fit’ area of the ejector pin?
  10. Is the bore finish approximately 0.4 micron?
  11. Were the bores for the ejector pin jig bored or CNC to assure proper alignment and concentricity?
  12. Is the ejector pin a vented location?
  13. What is the polymer being molded? Is it ‘sticky’?
  14. Is the ejector pin being used in an area such as a ‘gate pad’ where packing pressures may be high and long in duration, creating deflection of the pin?
  15. Did just one pin break or a series of pins? Are they within the same quadrant of the mold if applicable?
  16. Consider a longer supported ‘working’ pin length and consider a longer shoulder
  17. Always test the pin hardness on a flat surface area of the pin and test with the appropriate hardness testing load on a scale, such as 60 kg. Do not use a heavy 150 kg load on the scale as it will provide an inaccurate reading.

summary

DEK is a China leading ejector pin supplier, we can offer a full range of high precision pins, contact our sales team if you have the projects.

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