JIS Standard SKH51 Steel Gas Release One-Step Core Pins Flat Sides

These gas-release, one-step core pins are used in injection mold tooling where controlled venting is needed while maintaining stable core alignment. The flat sides improve locating consistency in the core set, helping resist shift during repeated clamping and ejection cycles.

• Automotive connector and housing molds: The one-step gas-release geometry supports more consistent exhaust paths, reducing trapped air risk near tight core details. Flat sides help keep core pin seating stable so ejection alignment remains repeatable.
• Electronic enclosure injection molds: For fine, high-surface-area parts, efficient gas venting supports smoother fill and reduces burn marks. The SKH51 quenched hardening state is suited to wear in high-cycle production.
• Industrial or consumer device housings: When parts require reliable ejection while controlling gas at complex cavity transitions, the simplified one-step design reduces installation variability.

Choose this variant when you need efficient venting combined with accurate locating features to improve process consistency.

Steel grade: JIS Standard SKH51 (high-speed steel) is selected for core pins that must withstand repeated contact and wear from molding cycles. SKH51 is commonly associated with AISI M2-class high-speed steel performance in terms of wear capability and hot hardness.

Heat treatment / state: The configuration uses quenched hardening (per product description) to deliver high hardness for wear resistance. In practice, this is typically followed by tempering to balance toughness against excessive brittleness.

Properties and trade-offs:

• Wear resistance: Higher due to hardened microstructure, supporting long service life where pins experience friction and sliding contact.
• Toughness: Can be lower if hardness is pushed too high; tempering helps restore impact resistance for ejection reliability.
• Surface durability: Suitable for maintaining dimensional stability at the tip area during repeated gas-release operation.

Compare alternatives: softer steels may improve toughness but typically reduce wear life under high-cycle exhaust and core locating duty.

Start sizing by matching the pin’s shaft diameter D/P (0.8 ~ 13 mm) to the required bore diameter in the core set. The nominal diameter No. (1 ~ 13 mm) determines the base sizing group; then apply the specified shaft tolerance options (0/-0.005, -0.01/-0.02) when selecting the final variant.

Next, select the overall length L (16.5 ~ 100 / 120 / 150 mm ranges depending on option) to ensure proper engagement depth and secure locating. The product provides multiple L dimension tolerance options, including +0.02/0, 0/-0.1, and +0.01/0, which should be chosen based on assembly clearance in the mold build.

• Tip geometry: Confirm the required first step shape (1B / 1C / 1D) and tip shape selection (No processing, B, C, G, R, T) before validating vent path and clearance.
• Step and facet control: Ensure A (0.4 ~ 2 mm), facet count (1 face or 4 faces), and tip gradient tolerance (±0.01, ±0.005, ±0.005, ±0.015) align with the cavity/core interface needs.

Where tighter fits are required, select the tighter shaft tolerance option and verify the bore-to-pin clearance in your assembly drawings.