JIS Standard Ejector Pin Sets - Long Pins, Springs, Screw Plugs

Q: How do I select the correct spring length FL for stable ejection force?

Select FL (spring length) from 30–60 mm to match the working height in your ejector module. Proper FL selection helps maintain controlled spring compression across the stroke, supporting repeatable ejection. Verify that the selected FL keeps compression within your design constraints at max clamp/open positions.

Q: What punch diameter D options are compatible with this ejector pin set?

The configuration supports D values of 5, 6, 8, 10, 13, or 16/20/25 mm . Choose the D that matches the mating punch diameter and bore sizing in your mold. Confirm that your clearance/tolerance scheme for ejector hardware is compatible with the chosen D variant.

Q: Should I order the set package or pin only for my existing tooling?

The product offers two sales forms: set package or pin only . Choose pin only if springs and screw plugs are already present and in serviceable condition for the same L/FL/D configuration. Choose set package when you need a complete matched assembly to maintain stable operation and alignment.

Ejector Pin Sets - Long Pins, Springs, Screw Plugs deliver reliable precision alignment in mold assembly by keeping components consistently positioned. These sets are designed to improve mold performance and support long service life under high-demand production.

Long-type ejector pin set layout improves repeatable component alignment
Durable construction helps reduce wear and protect sensitive systems
Supports stable assembly through controlled L dimension options
Commonly used in injection molding to maintain consistent part quality

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Specifications

12 configurations available

L (L dimension) (mm)	FL (Spring length) (mm)	D (Applicable punch diameter) (mm)	Sales form (mm)	type
41 ～ 81	30 ～ 60	5	Set package	-
41 ～ 81	-	5	Pin only	-
41 ～ 81	30 ～ 60	6	Set package	-
41 ～ 81	-	6	Pin only	-
41.5 ～ 101.5	30 ～ 60	8	Set package	-
41.5 ～ 101.5	-	8	Pin only	-
41.5 ～ 101.5	30 ～ 60	10	Set package	-
41.5 ～ 101.5	-	10	Pin only	-
41.5 ～ 101.5	30 ～ 60	13	Set package	-
41.5 ～ 101.5	-	13	Pin only	-
42 ～ 102	30 ～ 60	16/20/25	Set package	-
42 ～ 102	-	16/20/25	Pin only	-

Product Guide

🏭Application Scenarios+

This long-pin ejector pin set is used in injection mold assemblies where consistent, repeatable positioning of ejector hardware is critical. It is well-suited for automotive and appliance component molds that run high cycle counts, because the set layout is designed to maintain stable alignment during ejector travel and reduce component-to-component misfit over time.

In electronics and connector housing molds, the long pin configuration helps preserve coaxiality between moving parts and ejector systems, supporting uniform ejection and reducing localized wear on surrounding guides.

For consumer and packaging parts that require reliable ejection under varying shot-to-shot conditions, the available L dimension range (41–81 mm, 41.5–101.5 mm, or 42–102 mm) allows engineers to match stroke/clearance requirements while keeping the spring travel controlled by the FL spring length (30–60 mm).

Choose the variant that matches the required L and FL to keep ejection alignment stable
Select by compatible punch diameter D (5, 6, 8, 10, 13, or 16/20/25) for fit into the molded tooling layout

🔧Material & Process Details+

Material and heat-treatment details are not provided in the supplied specifications for this ejector pin set. Therefore, heat treatment state, HRC hardness, and steel grade equivalents (e.g., H13/H13-like or M2/M2-like) cannot be stated accurately for this specific variant.

To ensure correct wear resistance and toughness balance for your application, confirm the steel grade and hardening method from the product documentation or MISUMI catalog data for the corresponding configuration (pin-only versus set package) and the selected D (punch diameter) and L option.

Verification needed: steel grade, target hardness (HRC), and whether pins are nitrided, quenched & tempered, or pre-hardened
Engineering trade-off: higher hardness improves wear resistance but may reduce toughness if impact loading is significant
Practical check: confirm guide fit and spring behavior for long-travel stability (controlled by FL = 30–60 mm)

📐Sizing & Selection Guide+

Correct selection starts with matching the ejector travel/stack-up to the L (length) dimension. Available options are 41–81 mm, 41.5–101.5 mm, or 42–102 mm. Choose the range that fits your mold’s moving plate-to-ejector interface and required clearance through the full operating stroke.

Next, match the spring configuration using FL (spring length) = 30–60 mm. The selected FL should provide the needed spring working height so that compression remains within design limits and maintains stable force during ejection.

Finally, verify compatibility with the tooling geometry by selecting the applicable punch diameter D: 5, 6, 8, 10, 13, or 16/20/25 mm. This D must align with the mating punch/ejector bore sizing in your mold.

Fit & tolerance: confirm your machine shop’s tolerance strategy for pin-to-bore clearance after selecting D
Configurable vs fixed: L and FL are selected by configuration ranges; D is the diameter variant; package form is either set package or pin only

Frequently Asked Questions

Which L dimension range should I choose for a long-travel ejector stack?+

Use the available L ranges to match your mold’s moving assembly stack-up and required travel clearance: 41–81 mm, 41.5–101.5 mm, or 42–102 mm. Select the option that keeps the pin within the designed engagement limits throughout the stroke. If your stack-up varies, choose the range that provides margin without excessive protrusion.

How do I select the correct spring length FL for stable ejection force?+

Select FL (spring length) from 30–60 mm to match the working height in your ejector module. Proper FL selection helps maintain controlled spring compression across the stroke, supporting repeatable ejection. Verify that the selected FL keeps compression within your design constraints at max clamp/open positions.

What punch diameter D options are compatible with this ejector pin set?+

The configuration supports D values of 5, 6, 8, 10, 13, or 16/20/25 mm. Choose the D that matches the mating punch diameter and bore sizing in your mold. Confirm that your clearance/tolerance scheme for ejector hardware is compatible with the chosen D variant.

Should I order the set package or pin only for my existing tooling?+

The product offers two sales forms: set package or pin only. Choose pin only if springs and screw plugs are already present and in serviceable condition for the same L/FL/D configuration. Choose set package when you need a complete matched assembly to maintain stable operation and alignment.

How do L and D jointly affect alignment in multi-cavity or long-core molds?+

Alignment stability depends on matching both the L length range and the D diameter variant to your mold’s geometry. Incorrect L can cause misfit through the stroke, while incorrect D may compromise the fit into the mating tooling. Use the L ranges (41–81 / 41.5–101.5 / 42–102) and select the compatible D (5, 6, 8, 10, 13, or 16/20/25) to ensure consistent coaxiality.