Shoulder Punches Double-Stepped Shank

Double-stepped shank shoulder punches are used in injection mold tooling where a punch must hold position reliably under repeated, high contact loads. The double-step shank design improves seating stability in the holder, helping maintain consistent punch alignment through production cycles.

• Automotive connector and terminal molds: ideal for piercing/blanking operations where the punch is exposed to frequent cycles and must resist wear while maintaining head height and seating integrity.
• Electronics and housings (high-volume precision tooling): suited for applications that require dependable dimensional stability in the punch length region (L and LC), reducing variation at the die interface.
• Medical device component molds (tight assembly fit): hardened steel options support long service life and stable punch seating, which helps prevent drift in the shoulder region that can affect part features.

Tip geometry choices (Round, Rectangle, Oblong, Radius Rectangle, Double-Flatted Round) allow matching to die openings for controlled edge formation and predictable wear patterns.

These shoulder punches are offered in SKH40-equivalent (powdered high-speed steel), SKH51-equivalent (M2), and SKD11-equivalent (D2) variants. SKH51 (M2) is typically selected for a balance of wear resistance and toughness for high-cycle punching. SKD11 (D2) emphasizes hardness and edge durability, but can be more sensitive to impact than HSS grades depending on conditions.

• SKH40-equivalent: powdered HSS for good wear resistance in repeated cycles.
• SKH51-equivalent (M2): high-speed steel for improved wear resistance while retaining workable toughness.
• SKD11-equivalent (D2): tool steel grade for strong edge retention in abrasive or long-run use.

All variants are supplied in a hardened steel configuration per the product’s hardened options intent, supporting stable punch seating and longer service life. Exact HRC values and heat-treatment recipes are not specified in the provided data, so final hardness selection should be confirmed against your tool’s load and required wear life.

Selection starts with matching the shank diameter D, which is specified as 3 ~ 25 mm with a D tolerance of +0.005/0 (m5 fit). Choose the D that matches the holder/bushing bore so the punch seats firmly without excessive clearance that could cause shoulder-region variation.

• Tip geometry: select the required tip shape (Round, Rectangle, Oblong, Radius Rectangle, Double-Flatted Round) to match the die feature (P and the corner radius R).
• Tip dimensions: use P = 1 ~ 18 mm, W = 1 ~ 6 mm, and corner radius R = 0.15 mm (as listed) to align the cutting contact area. Account for tip dimension alteration PC = 0.5 ~ 9 mm where applicable.
• Length control: verify L = 40 ~ 100 mm and the full-length alteration LC = 26 ~ 80.09 mm, with head thickness tolerance change/total length alteration listed in 26 ~ 40 mm ranges.

After confirming D and tip geometry, ensure the chosen head thickness/total length alteration (LCT/LMT) is compatible with your die stack height and the required punch-to-cavity position. Fixed dimensions are governed by the spec ranges above; tolerances influence fit and long-term alignment.