Large Diameter Tapped Punches

Where it’s used: In precision injection mold tooling, bolt-fixed large-diameter tapped punches create or form threaded features in mold inserts and cavity plates, especially when a stable, repeatable thread depth is needed after maintenance.

Scenario 1 – Automotive connector housings: These molds often include fine positioning and robust threaded mechanisms to align fixtures and slide components. The large-tap standard type and bolt-fixed design support quick punch replacement, helping maintain consistency when tooling is serviced frequently.

Scenario 2 – Medical device housings: Threaded passages for assembly or part alignment require dimensional stability after edge regrinding. Height adjustment capability after regrinding helps preserve setup accuracy without changing the overall tooling strategy.

Scenario 3 – Thick plates / high-tensile materials: For narrow pitches where a collar is not provided, the tapped large/extra-large diameter configuration improves cutting capability while reducing the risk of bolt issues during repeated operations.

• Bolt-fixed holding enables straightforward regrind-and-adjust cycles
• Supported for narrow pitch layouts without collar interference

Materials offered: This series is available in SKD11 equivalent steel and powdered high-speed steel. Both are intended for tooling that experiences repetitive cutting and regrind operations, but their wear/toughness balance differs.

SKD11 equivalent (hot-work tool steel family): Typically selected for good toughness and stable performance during tooling cycles. It is well suited when you need reliable edge life with moderate wear resistance, and when regrinding frequency is expected.

Powdered high-speed steel: Chosen for higher wear resistance under demanding cutting conditions. The trade-off is that tuning toughness and edge robustness depends on the final heat treatment and hardness target.

• Heat treatment (general guidance): Commonly supplied in a hardened/tempered condition for SKD11-equivalent tooling and in a quenched & tempered (and optionally tailored) state for powdered HSS to reach target hardness.
• Hardness / wear vs toughness: Higher hardness usually increases wear resistance but may reduce chipping resistance if impact loads are high.

Step 1: Match the shank diameter (D). Select a punch with shank diameter in the range D = 5 ~ 25 mm. The shank diameter tolerance is +0.005/0, m5, so ensure your mating hole/guide features are designed to accommodate an m5-style fit for repeatable guidance.

Step 2: Choose tip/tap geometry for thread formation. Tip-related dimensions include P = 1.2 ~ 18 mm, tip length B (L, S, X option), and full length alteration LC = 27 ~ 42 mm. Tip dimension alterations PC = 0.8 ~ 9 mm and tip corner radius R = 0.15 mm should align with your required thread lead-in and thread profile clearance.

Step 3: Verify overall length and regrind allowance. Use L = 30 ~ 70 mm and the alteration ranges to accommodate your regrind-and-height-adjust workflow. If you must restore setup accuracy after regrinding, keep within the specified alteration windows (LC/PC/W/WC) to avoid geometry drift.

• Configurable elements: tip shape (A, D, E, G, R), B option (L/S/X), and dimensional alterations (LC/PC/W/WC)
• Fixed reference: R is specified at 0.15 mm within this series data