SKH51 Steel Ball Lock Ejector Punches - Heavy Load, Wrench Flat

These ball-lock ejector punches are used in injection molding and die tooling where a repeatable ball-lock action is required to stabilize extraction. The heavy-load SKH51 steel body helps maintain consistent seating under high cycle stress, while the HW coating improves wear resistance for long production runs.

• Automotive and appliance housings: In multi-part mold cavities, they support dependable ejection forces and reduce intermittent lock-up caused by abrasion at the ball-lock interface.
• Consumer electronics snap-fit components: The wrench flat assists handling and alignment during tool assembly, helping engineers achieve consistent fit during periodic maintenance.
• Progressive dies and transfer tooling: Round/rectangular/oblong tip options allow tuning for extraction geometry while preserving ball-lock stability during frequent indexing.

With multiple shank diameters (10–25 mm) and selectable tip forms, this variant is suited for projects that prioritize extraction reliability and interface durability.

SKH51 tool steel is used for its balance of wear resistance and toughness in sliding/impact regions common to ejector systems. This punch is finished with an HW coating intended to further improve abrasion resistance, helping reduce material loss during high-cycle extraction.

In mold tooling practice, SKH51 is commonly heat-treated to achieve a hard surface for wear durability, trading off some toughness to improve tool life at the contact areas. For design trade-offs, higher surface hardness increases resistance to scuffing and galling, while excessively hard conditions can be more sensitive to edge chipping if shock loading is extreme.

• Hardness: Final HRC is not specified in the provided data; confirm with your purchase documentation for exact target value.
• Manufacturing: Steel punches are typically precision ground to control the shank and tip dimensions, then coated after machining to maintain fit where ball-lock interfaces engage.
• Coating effect: The HW layer improves wear resistance, supporting longer runs compared to uncoated tooling under similar loads.

Select sizing by matching the shank diameter (D), overall length, and tip geometry to the cavity/core and the ball-lock ejector guide space. Available D values are 10, 13, 16, 20, and 25 mm, so choose the diameter that fits the mating ejector/bushing bore without binding.

• Overall length (L): choose from 80–100 mm or 71–100 mm depending on your ejector stack-up and required stroke clearance.
• Full length alteration (LC): available in the range 52–99.9 mm; use this to fine-tune for tool layout while maintaining adequate engagement length.
• Tip geometry: select Tip Shape (Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle) and corresponding P, PC, W, WC, and R ranges to match the extraction contact area.

Because interface fit is critical for ball-lock action, keep an eye on functional clearances and assembly tolerances in the mating parts; confirm that the selected tip/body dimensions align with your tool’s locking and ejection alignment requirements. Dimensions listed as variable are configurable within the stated ranges.