Rectangular Ejector Pins for Large Mold

Name: Rectangular Ejector Pins for Large Mold — M2 & H13, JIS & 8mm Head | Axiom Molds
Brand: Axiom Molds
Availability: InStock
Rating: 4.9 (128 reviews)

Blade-type ejector pins for narrow rib and deep slot ejection in large injection molds. 11 series covering M2 and H13 materials, JIS and 8mm head heights, standard and R-chamfered blade profiles.

Products — 11 Series

M2 Steel, JIS Head, Configurable Length

Standard blade with JIS head height. Custom length to 0.1 mm.

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M2 Steel, 8mm Head, Configurable Length

Fixed 8mm head for structural support on long pins.

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M2 Steel, 8mm Head, Configurable Width × Thickness

Custom blade dimensions for non-standard rib geometry.

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M2 Steel, JIS Head, Crimping Blade

Crimped edge for enhanced resin grip during ejection.

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M2 Steel, JIS Head, Configurable Width, Crimping

Custom width crimping blade for non-standard ribs.

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M2 Steel, Blade Blanks

Un-headed blanks for custom head machining.

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H13 Nitrided, Configurable Width × Thickness

For glass-filled and abrasive resins. 900+ HV surface.

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H13 Nitrided, 8mm Head, Configurable Length

Fixed head height with nitrided wear resistance.

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R-Chamfered, H13 Nitrided, Configurable

R-chamfer on blade edges reduces stress concentration.

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R-Chamfered, M2 Steel, 8mm Head

R-chamfer in M2 high-hardness steel.

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H13 Nitrided, Configurable Length

Standard blade width with nitrided surface.

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Material Selection: M2 vs H13

The two material families serve different failure modes. Match your resin type to the correct steel grade:

Property	M2 (SKH51)	H13 (SKD61) Nitrided
Core Hardness	60–62 HRC	44–48 HRC
Surface Hardness	~750 HV (through-hardened)	900–1,100 HV (nitrided layer)
Abrasion Resistance	Good	Excellent (glass-filled resins)
Deflection Resistance	Excellent (higher modulus)	Good
Thermal Fatigue Resistance	Moderate	Excellent
Best For	Unfilled resins, precision molds	Glass-filled, high-temp resins
Cost	$$	$$$

Decision rule: If running glass-filled or mineral-filled resins, always choose H13 nitrided — the surface hardness advantage is decisive. For unfilled engineering plastics (ABS, PC, POM), M2 offers better deflection resistance at lower cost. For a detailed material comparison with lifecycle cost analysis, see our M2 vs H13 Rectangular Ejector Pins — Material Selection for Large Molds.

Application: When to Use Rectangular Ejector Pins

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Narrow Rib Ejection

Ribs with width < 3 mm cannot accommodate round ejector pins. Rectangular pins match the rib cross-section for distributed ejection force without marks.

Blade geometry distributes ejection pressure across the full rib face, preventing the point-load whitening that round pins cause on thin ribs.

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Deep Slot Ejection

Slots deeper than 5× width create high friction during ejection. Blade pins enter the slot and push from the full slot surface area.

The blade tip engages the full slot bottom surface, preventing the ejection-side drag marks that occur when round pins push asymmetrically on slot features.

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Textured Surface Ejection

Textured ribs grip the mold during ejection. R-chamfered blades reduce stress concentration at blade edges, preventing part damage on textured surfaces.

The R-chamfer eliminates the sharp blade-edge-to-part contact that causes micro-cracking on textured or semi-crystalline parts during ejection.

Sizing tip: Blade width should match rib width with 0.02–0.05 mm clearance per side. Blade thickness is determined by the plate pocket and required pin rigidity. For step-by-step blade sizing calculations, see our How to Size Rectangular Ejector Pins — Matching Blade to Rib Geometry.

Frequently Asked Questions

What is the maximum blade width and thickness available for large mold rectangular ejector pins?+

Standard catalog covers blade widths from 1.2 mm to 16 mm and thicknesses from 0.8 mm to 10 mm. Configurable series allow custom width × thickness combinations in 0.1 mm increments for non-standard rib geometries. For blades exceeding catalog dimensions, contact engineering for custom quotation — we regularly produce oversize blades up to 25 mm width for automotive bumper molds.

M2 or H13 — which material is better for rectangular ejector pins in glass-filled resins?+

H13 nitrided is significantly better for glass-filled resins (PA-GF, PBT-GF, PPS-GF). Glass fibers are highly abrasive, and the nitrided surface layer (900–1,100 HV) provides 3–5× the wear resistance of through-hardened M2 steel (60–62 HRC ≈ 750 HV). M2 is the better choice for unfilled resins where higher core hardness aids against mechanical deflection in long, thin blades. As a rule of thumb: if your resin datasheet lists glass fiber content ≥ 15%, choose H13 nitrided.

What is the difference between JIS head and 8mm head rectangular ejector pins?+

JIS head height varies by blade cross-section size, typically ranging from 3 to 5 mm depending on blade width. The 8mm fixed-height head provides consistent structural support regardless of blade size, which simplifies ejector plate pocket machining to a single depth dimension. Use 8mm head for pins longer than 200 mm where the bending moment at the head is significant, or when standardizing pocket depths across multiple pin sizes in the same mold. JIS head is the default for shorter pins and lighter ejection loads.

Engineering Resources

Comparison Guide

M2 vs H13 Rectangular Ejector Pins — Material Selection for Large Molds

Material selection guide for different resin types and operating conditions.

Sizing Guide

How to Size Rectangular Ejector Pins — Matching Blade to Rib Geometry

How to match blade dimensions to rib geometry.

Need Rectangular Ejector Pins?

Specify rib width, depth, resin type, and mold size. Custom blade dimensions available in 0.1 mm increments.

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✓ 11 series in stock✓ Custom blade dimensions✓ MOQ 1 piece