M2 Steel Ball Lock Pilot Punches - Round Tip, Heavy Duty, In

These heavy-duty ball-lock pilot punches are used in inch-based progressive, blanking, and stamping die sets where consistent start position is critical. The ball-lock locating concept stabilizes alignment as punches cycle, reducing the risk of pilot-to-hole mismatch under repetitive press loads.

They are well suited for:

• Automotive connector and bracket stamping—the round tip pilot helps guide material entry and supports accurate positioning during high-frequency operations.
• Appliance and metal enclosure blanking—reliable inch tooling setup benefits from the controlled locating geometry for repeatable part production.
• High-wear progressive die stations—the hard, wear-resistant M2 steel base material is designed to maintain locating performance over longer runs.

Choose the round-tip variant with M2 steel when your tooling requires stable pilot engagement and durable wear resistance while operating in standard die interfaces.

This series is offered in M2 (and also PS4 per the available material options). M2 high-speed steel is selected for its strong wear resistance and the ability to retain hardness under tooling conditions, which is important for ball-lock pilot punches that repeatedly locate on mating features.

For heat treatment, these tool steels are typically processed to achieve a hardened condition for service:

• M2: usually supplied and manufactured in a hardened & tempered state to balance hardness and toughness.
• PS4: used as an alternate steel option for applications requiring different performance trade-offs versus M2.

In general, higher hardness improves wear life, while toughness becomes the limiting factor under shock or misalignment. Select the steel variant that best matches your press load severity and expected wear rate. Hardness (HRC) and exact heat-treatment targets are dependent on the specific processing route for the selected material.

Correct sizing ensures the pilot punch properly engages the mating die/punch locating features. Use the provided ranges for the key dimensions:

• Shank diameter (D, in): 37 ~ 125
• Point/length code L (coded inch): 250 ～ 600, 250 ～ 700, 275 ～ 700, 300 ～ 700
• B and L length combinations (coded inch): 250 ～ 600, 250 ～ 700, 275 ～ 700, 300 ～ 700 (as applicable)
• P dimension (in): 0.061 ~ 0.999

Match the pilot punch length (L and any specified point-length code variant such as B/L or C/L) to the required engagement depth between the moving punch plate and stationary die components. Ensure the shank diameter D fits the corresponding guide/pilot bore for your inch tooling interface.

Because locating systems rely on precise sliding contact, review your application’s fit expectations and consider proper manufacturing tolerances in the die’s pilot holes/guide bushings to maintain consistent alignment during cycling. Fixed dimensions follow the selected code; variable sizing is determined by choosing the D and the L (and related coded point-length) configuration.