Carbon Steel Tool Head With Hollow Square Punch for Industrial Presse

Hollow square punch forged from carbon steel and finish-machined to produce clean, burr-minimised square holes in sheet metal, plate stock, and structural sections. Also referred to as a square hole punch, mortise punch, or piercing punch, the hollow square punch features an open centre bore that serves as the slug ejection channel — allowing cut slugs to pass through the tool body during continuous high-speed punching operations without jamming the die set. Hollow square punches are manufactured from high-carbon or alloy tool steel — commonly AISI S1, S7, A2, D2, or H13 — selected based on the target material being punched, production volume, and required impact toughness. The forging operation produces a continuous grain flow along the punch shank and cutting head, delivering superior shock resistance compared to machined-from-bar tools that cut across the grain. Post-forge operations include rough machining, heat treatment (oil or air quench followed by temper to the target hardness range, typically HRC 56-62 for cold-work punches), finish grinding on all critical surfaces, and EDM or wire-cut finishing on the square cutting profile where corner radii must be held to tight tolerance. Shank geometry — whether straight, shouldered, or flanged — is machined to fit standard punch retainer systems per your press tooling specification. Hollow square punches are deployed across metalworking and fabrication applications where square perforations or mortises are required. Punch-and-die sets in turret punch presses and single-station stamping presses use hollow square punches for creating square holes in electrical enclosure panels, chassis components, and structural brackets. Mortising machines in woodworking and timber-frame construction use hollow square chisels (a variant of the hollow punch principle) to cut square mortise pockets for tenon joints. Progressive die stations in high-volume stamping lines incorporate hollow square punches as part of multi-station tooling where square apertures, slots, or pilot holes are formed in sequence. Leather, gasket, and rubber die-cutting operations use hollow square punches in manual and pneumatic presses to produce square cutouts in non-metallic sheet materials. ISO 9001 and IATF 16949-certified production line with precision tooling capabilities, covering close to 15,000 m². Hardness verification and dimensional inspection controls are maintained within the quality plan at every production stage. End markets include automotive, medical equipment, and automation. Submit your tooling specification including shank size, square cutting edge dimensions, corner radius, tool steel grade, hardness range, and press fitment standard to request a quote for hollow square punches from our certified forging and tool grinding line.