DIN934 HSS #4 K.O Pin Cold Forming Rear Back Punch Pin

DIN934 HSS #4 K.O. Pin – Cold Forming Rear Back Punch Pin

HengfaMold's DIN934 #4 Knockout (K.O.) rear back punch pins are precision-engineered for multi-station nut formers and cold heading machines. Fabricated from premium High-Speed Steel (HSS) with a wear-resistant Titanium Nitride (TiN) gold coating, these knockout pins ensure smooth part ejection, high dimensional stability, and prolonged service life during high-speed continuous fastener production.

Key Features

• Premium High-Speed Steel (HSS) – Exceptional core toughness, high impact resistance, and fatigue strength to prevent bending or premature breakage under heavy heading loads.
• Wear-Resistant TiN Gold Coating – PVD Titanium Nitride coating reduces surface friction, minimizes heat buildup, and prevents galling and seizure in rapid cycling.
• High-Precision Dimensional Accuracy – Ground to tight tolerances with mirror-polished surfaces, ensuring seamless fit and flawless alignment inside punch sleeves and die cases.
• Standard DIN934 Nut Forming Fit – Specifically optimized for station #4 nut forming operations and standard multi-station cold heading sequences.
• Extended Tooling Life – Substantially lowers downtime and tooling replacement frequency, driving higher production efficiency and cost savings.

Technical Specifications

• Product Type: Knockout Pin / Rear Back Punch Pin (后冲棒 / K.O. Pin)
• Standard / Station: DIN934 #4 Station Form Sequence
• Base Material: Premium HSS (M2 / H55 / M42 available)
• Surface Treatment: TiN (Titanium Nitride) Gold TIN Coating
• Hardness: HRC 56–68 (customizable by application)
• Machine Compatibility: Multi-station cold heading formers (Sijin, Boyu, Lian Shyang, Jiaxin, Jinggu, youxin, and many other brands)
• Customization: Custom diameters, overall lengths, and head geometries manufactured to customer technical drawings

Applications

Widely utilized as ejector and rear back punch tooling in multi-station cold headers and nut forming machines producing standard hex nuts (DIN934, ISO 4032), flange nuts, and specialized automotive fasteners.

Custom Tooling & OEM Orders

HengfaMold provides complete custom tooling solutions tailored to your production requirements. Send us your technical drawings or part specifications for fast quotes, tooling design assistance, and volume manufacturing support.