Ultra-Fine Grain Tungsten Carbide Precision Punch with High Hardness ≥ 90.5 HRA and Mirror-Like Surface Roughness Ra ≤ 0.05 μm

This tungsten carbide (cemented carbide) micro precision punch features a body diameter of Φ 1.95 mm and tip radius of R0.2 mm. Designed for micro-hole blanking, precision step forming, and high-speed punching applications, it is ideal for progressive dies, high-speed stamping dies, and powder metallurgy molding tools requiring long service life and strict dimensional consistency.

Manufactured from ultra-fine grain tungsten carbide (WC grain size ≤ 0.5 μm) with 6%-10% cobalt binder. This material combination delivers high hardness (≥ 90.5 HRA) and high transverse rupture strength (≥ 3000 MPa). Compared to conventional high-speed steel punches (M2, ASP23), service life is 5-10 times longer, particularly when punching hard materials like stainless steel, silicon steel, and copper alloys.

• 5-axis CNC precision grinding + mirror polishing
• Diameter tolerance: ± 0.002 mm (±0.001 mm achievable)
• Radius profile deviation: ≤ ±0.003 mm
• Surface roughness: Ra ≤ 0.05 μm (mirror-like) - reduces sticking and frictional heat
• Concentricity & cylindricity: ≤ 0.005 mm - suitable for precision guide bushings

• Stainless steel (SUS 304, 301, 430)
• Silicon steel
• Copper alloys (beryllium copper, brass)
• Aluminum foil, nickel strip
• Engineering plastic sheets

• Individual plastic protection tube + rust preventive oil
• 10 pieces / box, with dimension, material, batch number on label
• Optional 3D inspection report (including profile, roundness, roughness)