JIS Standard Steel L-Punched Straight Punches

L-punched straight punches are used in progressive and transfer die sets where repeated punching, trimming, or fine blanking operations require stable punch-to-guide alignment. The straight shank and JIS-compatible mounting profile help maintain consistent positioning through cycles, reducing the risk of tip drift and uneven wear.

• Automotive stamping connectors & clips: Select high-speed or air-hardening tooling grades (e.g., SKH51/M2 or SKH40 equivalent) when you need strong hot-work abrasion resistance for long production runs; the optional lapping surface condition supports repeatable cutting behavior.
• Appliance and sheet-metal panels (trimming stages): Using a straight punch with the correct tip and head thickness supports controlled trimming clearance; choosing SKD11/D2 when moderate toughness is acceptable can balance edge durability with grindability.
• Thin-gauge precision parts: The lapping option is suited to applications that are sensitive to surface condition and require consistent performance across batches, especially under higher cycle counts.

These JIS standard punches are available in tooling steels tailored to punching and trimming wear modes. SKH51 is an equivalent to AISI M2 high-speed steel and is selected for abrasion resistance under demanding cycle counts; typical performance targets are high hardness and good hot hardness, with a trade-off of lower toughness versus air-hardening die steels.

• SKH51 (M2): Quenched and tempered heat treatment for HSS structure; expect very high wear resistance and edge stability for long runs.
• SKD11 (D2): An equivalent to AISI D2, commonly used after quench and temper to reach high hardness; strong wear resistance with careful toughness management.
• SKH40 (powder HSS equivalent): Powder metallurgy HSS variants offer refined carbides for improved wear performance; often chosen where consistent cutting edge durability matters.
• Surface treatment: Lapping refines surface condition to improve tool-to-material interaction; none keeps the as-finished condition.

Hardness is determined by the supplier’s heat treatment recipe for each grade; ensure your die build targets balance hardness (HRC) with toughness to avoid chipping at high loads.

Correct dimension matching is critical for punch alignment, edge clearance, and press rigidity. Start by selecting the nominal diameter (No.) from 1 to 25 mm, then match the tip dimension P from 0.5 to 20 mm to your die detail (shear land geometry and punching diameter).

• Choose length L based on strip stack-up and the required projection through the die set: available ranges include 20–30, 20–60, 40–80, 40–100, and 40–120 mm.
• Select head thickness/plate thickness T as 3 or 5 mm to fit the standard mounting interface of the die block.
• Lapping condition: selecting lapping helps achieve more consistent surface condition for repeated punching; it does not replace proper dimensional fit.

When you design clearances, account for manufacturing tolerances at the mounting and working surfaces. The provided LC/LCT/LMT values are shown as fixed 20–20 in this data set, so verify whether those correspond to your build’s expected total-length alterations before final assembly.