M2 Steel Ball Lock Ejector Punches

Ball-lock ejector punches are used in injection and stamping toolsets to deliver stable part ejection by combining controlled punch positioning with ball-lock retention. The M2 steel base with an HW coating is suited for high-cycle, heavy-load operations where ejector wear and loss of dimensional stability can cause sticking or misalignment.

• Automotive connector and bracket tooling: In punch-and-blank dies, the regular shoulder supports repeatable extraction alignment, while the HW coating improves wear resistance under frequent ejector strokes.
• Heavy-load die sets for appliance housings: For deeper or more demanding cavities that require consistent ejection timing, the quenched, hardened M2-equivalent steel helps maintain tool life and hardness during production.
• Thin-wall component ejection: When part removal must be controlled to avoid deformation, selecting the correct tip shape (round/rectangle/oblong and radiused options) helps match the contact geometry to the molded or formed features.

This variant uses an M2-equivalent high-speed steel (noted as SKH51-equivalent) in a quenched, hardened condition to balance hardness, wear resistance, and toughness for ejector punch duty. The HW coating is applied to further reduce surface wear during heavy cycling, supporting longer service intervals in punch-and-blank tooling.

• Hardness & wear resistance: M2-grade tool steels are selected for their ability to retain hardness at operating temperatures better than lower-alloy steels, while the HW coating reduces abrasive and adhesion wear.
• Toughness trade-off: As hardness increases, impact resistance can decrease; therefore, correct clearance and alignment in the die set are important to avoid chipping.
• Comparison (brief): Compared with non-coated tool steels, the coated M2 base improves wear performance; compared with softer tooling alloys, the M2-equivalent hardness supports longer life under heavy load.

To select the correct ball-lock ejector punch, first match the shank diameter (D) to your ball-lock bushing and ejection train requirements: available options are 10, 13, 16, 20, 25 mm. Next, choose the overall L dimension based on your tool height and the required stroke/retention envelope: 80–100 mm or 71–100 mm ranges are offered.

• Tip geometry: Select the tip shape (Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle) and then confirm the tip dimensions: P (2.5–18 mm), W (2.5–6 mm), and corresponding PC / WC alterations (PC: 1.25–9; WC in ranges such as 1.25–2.49 up to 3–5.99 depending on option).
• Tip radius: Choose R from 0.15–12.44 mm depending on the selected tip program to match contact area and avoid stress concentration.
• Full length alteration: LC is fixed at 52–99.9 mm; use this to keep engagement depth consistent with the mold/die base thickness and ball-lock mechanism.

Because these are dimensionally variant components, verify that the selected combination of D, L, LC, and tip geometry meets both alignment and clearance needs in your cavity/core system.