Double Stepped Tapped Punches

Double-stepped tapped punches are used in injection and metal-forming tooling where a bolt-fixed punching member must be replaced quickly and its working height adjusted after regrind. The two-step geometry improves guidance and helps maintain alignment in narrow-pitch layouts, reducing the risk of punch vibration and bolt loading.

• Narrow pitch punching for automotive brackets and connector housings: the double-step structure is designed to avoid collar interference while still supporting a stable tapped interface for secure holding.
• Thick plate and high-tensile material punching: bolt-fixed tapped operation can reduce service downtime, and the stepped guide section helps when the available guide cutting edge length cannot be secured by tip diameter alone.
• High bolt load replacement scenarios: when bolt failure is a concern, the tapped large-diameter or tapped extra-large diameter specifications provide a larger thread area for more robust retention.

The offered versions use either powdered high-speed steel or SKD11 equivalent, selected based on wear–toughness needs in punching service. Powdered high-speed steel generally provides strong wear resistance for repeated cutting edges, while SKD11 (a tool steel commonly associated with H12-family performance) is chosen for durability in demanding punching cycles.

• Wear resistance vs. toughness trade-off: higher wear resistance steels tend to be less forgiving under impact; SKD11-equivalent variants typically offer a balanced toughness level for stable punching.
• Hardness and heat treatment state: the product data provided specifies the steel family (powdered HSS / SKD11 equivalent) but does not include an exact HRC target or heat-treatment recipe (e.g., quenched & tempered, nitrided). For final design verification, request the associated hardness after heat treatment for your specific variant.
• Manufacturing: punched features require precision grinding of the stepped tip (including corner R) to preserve alignment and cutting edge geometry.

Select dimensions by matching the tapped punch geometry to your mold or tool’s bolt-fixed cavity/core interface and the required cutting edge engagement. The series supports D (shank diameter) = 5 ~ 25 mm, with the D tolerance of +0.005/0 and an m5 fit callout, so verify fit with the mating bushing/guide bore.

• Tip geometry selection: choose P (tip dimension) = 0.8 ~ 9 mm, B (tip length) ranges as provided for your option set (e.g., 2 ~ 45, 2 ~ 60, 2 ~ 25, 2 ~ 30 mm), and V (second step tip diameter) = 0.83 ~ 9.01 mm.
• Height and regrind allowance: use F (length from tip end to second step R) and LC (full length alteration) (e.g., 35 ~ 79.9, 35 ~ 99.9, 25 ~ 79.9, or 42 ~ 99.9 mm depending on the configuration) to confirm the remaining usable stroke after regrinding.
• Step corner control: keep the R (tip corner radius) = 0.15 mm to maintain guidance and reduce stress concentration.

Dimensions are configurable by the provided ranges; fix the shank diameter (D) and tapped standard type first, then match the stepped tip (P/B/V/F) to cavity/core cutting requirements.