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High-Speed Steel Ejector Pin Assembly
This high-speed steel ejector pin assembly is a high-wear, high-stability ejection component designed for precision injection molds and stamping dies. Made of high-speed steel and precision machined, it features high hardness, high toughness and excellent wear resistance. It enables smooth ejection of plastic and stamped parts, reducing defects such as white marks and deformation. Widely used in precision mold production.
- Machining Process: Precision CNC machining, heat treatment, surface grinding
- Material: High-Speed Steel (SKD61 / SKH-51 optional)
- Accuracy: ±0.002 mm
- Surface Finish: Mirror polish / Nitriding optional
- Hardness: HRC58-62 (depending on material)
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We specialize in custom manufacturing of mold ejector pin assemblies and other precision parts, equipped with high-precision CNC lathes, cylindrical grinders, heat treatment equipment and surface treatment facilities, with over ten years of experience in mold component production. The key dimensional tolerance of the ejector pin assembly is stably controlled within ±0.002 mm, with a monthly production capacity of 100,000 pieces. We provide one-stop services from design, material processing, heat treatment to surface treatment, serving customers in injection molds, stamping dies and automation equipment industries.
Technological Process
- Drawing & Process Design: Determine ejector pin specifications, tolerances and surface treatment solutions based on customer requirements, and optimize processing technology.
- Material Cutting & Rough Machining: Cut high-speed steel bars to size and perform rough turning to remove most of the excess material.
- Heat Treatment: Conduct quenching and tempering to stabilize material hardness at HRC58-62, improving wear resistance and toughness.
- Precision Grinding: Precision grind the ejector pin shank on a cylindrical grinder to ensure dimensional accuracy and roundness; machine the head as required.
- Surface Treatment (Optional): Conduct mirror polishing, nitriding or coating treatment as required to improve surface finish and wear resistance.
- Inspection & Packaging: Fully inspect the ejector pins for dimensions, roundness, hardness and surface quality, then classify and package qualified products by specifications.
Core Advantages & Applications
Common Applications
- Injection Molds: Ejector pins for precision plastic parts, clear parts and thin-wall parts
- Stamping Dies: Ejection and positioning of metal parts, terminals and small stamped parts
- Automation Equipment: Locating pins, guide posts and ejection mechanism components
- Precision Fixtures: Positioning assemblies, support posts and ejection mechanism accessories
Specification Table
| Parameter | Details |
| Material | High-Speed Steel (Standard SKD61 / SKH-51, other grades available upon request) |
| Machining Process | CNC lathe machining, heat treatment, cylindrical precision grinding, forming machining |
| Dimensional Tolerance | ±0.002 mm (Custom precision available) |
| Surface Finish | Mirror polish, nitriding, coating treatment (Optional) |
| Hardness | HRC58-62 (depending on material and heat treatment process) |
| Diameter Range | Custom per customer drawings (Typical φ0.5mm-φ20mm) |
| Length Range | Custom per customer drawings (Typical 10mm-300mm) |
| Head Shape | Flat head, round head, stepped head, flat ejector pin, etc. (Customizable) |
| Quality Control | 100% inspection of dimensional tolerance, roundness, straightness and hardness, batch inspection reports available |
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