Straight Ejector Pins — Without Tip Processing
The standard base product — uniform round cross-section with as-ground tip finish. 24 product series across M2, H13, 440C, and chrome-plated options in JIS and DIN head standards.
Products (24 Series)
M2 Steel, Head T=4mm, Selectable Diameter & Length
SKH51, HRC 60-62. Standard JIS head. ø1.0–ø25mm.
H13 Steel, Nitride Coated, JIS Head
SKD61, HV 900+ surface. Superior toughness for high-temp resins.
440C Stainless Steel, Head T=4mm
SUS440C, HRC 56-58. Corrosion resistant for PVC/POM resins.
M2 Steel, Chrome Plated, JIS Head
Chrome HV 800+. Improved release for sticky resins.
Extra Precision (h5), M2 Steel
Tight tolerance ±0.003mm for precision molds.
H13 Steel, Pre-Hardened, Configurable
Pre-hardened H13 without nitriding. Cost-effective option.
Material Selection Guide
Four material grades cover 99% of applications. Match your resin type and mold conditions to the right grade:
| Property | M2 / SKH51 | H13 Nitrided / SKD61 | 440C / SUS440C | Chrome Plated M2 |
|---|---|---|---|---|
| Core Hardness | HRC 60–62 | HRC 48–52 (HV 900+ surface) | HRC 56–58 | HRC 60–62 (HV 800+ chrome) |
| Wear Resistance | ★★★★★ | ★★★★ (nitrided surface) | ★★★★ | ★★★★★ (chrome layer) |
| Toughness | ★★★ | ★★★★★ | ★★★ | ★★★ |
| Corrosion Resistance | ★ | ★★ | ★★★★★ | ★★★★ |
| Max Mold Temp | ~200°C | ~300°C+ | ~200°C | ~180°C |
| Best For | General purpose, ABS/PC/PP | PA+GF, PPS, high-temp resins | PVC, POM, medical grade | TPE, sticky resins |
| Relative Cost | $ | $ | $$ | $ |
Selection rule: Start with M2 for standard resins (ABS, PC, PP, PE) — it covers ~80% of applications. Switch to H13 nitrided for glass-fiber-filled resins or mold temperatures above 200°C. Use 440C only for corrosive gases (PVC, flame-retardant). For a detailed material breakdown, read our Ejector Pin Tolerance Grades: h5, h6, h7 — Which to Choose?
About Standard Straight Ejector Pins
Straight ejector pins without tip processing are the most widely used ejection component in injection molding, installed in approximately 85% of all production molds. The "without tip processing" designation means the pin tip has a standard as-ground finish (typically Ra 0.4–0.8) without additional machining such as flat grinding, radius forming, or Z-groove cutting.
Dimensional Standards: Available in JIS B 5113 (head T=4mm) and DIN 1530 (head T=3.2mm) specifications. Shaft diameters follow standard increments: ø0.5, ø1.0, ø1.5, ø2.0, ø2.5, ø3.0 ... ø25.0mm. Lengths are configurable in 0.5mm increments from 50mm to 300mm (diameter-dependent maximum).
Application Scenarios
General-Purpose Injection Molding
Standard production molds for consumer products, housings, and structural parts in ABS, PC, PP, and unfilled nylon.
Why standard pins fit: M2 steel (HRC 60-62) provides the best wear resistance for standard resins. No special tip processing needed for flat or slightly contoured ejection surfaces.
Recommended: M2, h6 tolerance, JIS head, configurable length
High-Temperature Engineering Resins
PA66+GF30, PPS, PEEK molds operating above 200°C with abrasive glass fiber content.
Why H13 nitrided fits: Superior toughness prevents thermal fatigue cracking. Nitrided surface (HV 900+) resists glass fiber abrasion.
Recommended: H13 nitrided, h6 tolerance, ø3.0mm+ diameter
Frequently Asked Questions
What tolerance grades are available for standard straight ejector pins?+
What is the maximum ejector pin diameter and length available?+
What is the MOQ for ordering straight ejector pins?+
Engineering Resources
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