JIS Standard SKH51 Steel Heavy Load Punch Blank with Locating Dowel Hole

This heavy-duty punch blank is used in injection and stamping die sets where rigid punch retention and repeatable alignment are critical. The integrated locating dowel hole supports stable positioning in the die block, reducing runout and improving alignment during high-cycle production.

• Automotive stamping and die assemblies: The SKH51-based blank helps maintain punch stability under heavy press loads, with the locating dowel hole improving die-to-punch repeatability during fast tool cycles.
• Industrial power-press tooling: Ideal for applications requiring consistent ejection and long service life; the “heavy load” design supports controlled movement whether using the standard ejector arrangement or the spring and pin reinforced type.
• High-precision component punching: When repeatable registration matters, the dowel hole allows accurate punch alignment in the die block, helping reduce wear caused by misalignment.

Choose this variant when your tool design needs a fixed locating datum (dowel hole) for consistent assembly and reliable performance in demanding press operations.

The punch blank is made from JIS Standard SKH51 steel, commonly referenced as an AISI M2-equivalent high-speed steel for wear-focused punch applications. It is intended to provide strong surface hardness for cutting and punching edges while maintaining adequate toughness for intermittent shock loads.

• Wear resistance: SKH51’s high hardness supports abrasion resistance in heavy-cycle stamping and die tool use.
• Toughness trade-off: As hardness increases, impact toughness may decrease; proper heat treatment and rigid tool alignment help manage this balance.
• Heat treatment state: The product is described as hardened steel for improved wear resistance (commonly delivered in a quenched-and-tempered or equivalent hardened condition for HSS performance).

Compared with softer mold/die steels, SKH51 is optimized for cutting/punching wear, though it typically requires controlled heat treatment to achieve the intended hardness and durability.

Select the punch blank dimensions by matching the shank and overall length requirements of your die block and punch holder assembly. The shank diameter D is available as 10, 13, 16, 20, 25 mm, and the design includes an L dimension range of 60 to 100 mm.

• Match D to the punch holder bore/fixture: Use the required shank diameter for stable retention and predictable guidance through the die.
• Match L and LC to stack-up constraints: Ensure the installed full-length alteration LC = 50 to 99.9 mm fits within your tool height and adjustment envelope.
• Use S for positioning interface geometry: Select the S dimension of 28 or 36 mm to align with your die block layout around the locating features.

The shank diameter is specified with an m5 tolerance fit for consistent assembly. For best alignment, confirm the locating dowel hole datum matches your die block’s dowel position to maintain repeatable punch registration.