Drill Rod Tool Steels 81175788 4142 Alloy Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 81175788 is a pre-hardened alloy steel flat bar cut to 36 inches long, 1 inch wide, and 0.25 inches thick. Manufactured to AISI/SAE Type 4142 specification, this chromium-molybdenum alloy steel offers good toughness and fatigue resistance in the pre-hardened condition, making it suitable for tooling, jigs, fixtures, and structural machine components where through-hardening and post-machining heat treatment are not required. The stock weighs 2.54 pounds per piece. Machinists, tool and die makers, and maintenance technicians working in fabrication or industrial maintenance typically source this material for direct use or finish machining.

This flat stock is suited for applications in industrial manufacturing, general fabrication, and machine shop environments. AISI 4142 pre-hardened flat bar is commonly used for die components, wear plates, support brackets, and custom tooling where a balance of hardness and machinability is needed. The controlled tolerances on all four dimensions make this bar stock appropriate for precision fitment work without requiring additional straightening or prep before layout and machining operations begin.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre-hardened condition
• Nominal dimensions: 36 inches long, 1 inch wide, 0.25 inches thick
• Length tolerance: plus 0.25 inches, minus 0 inches
• Width tolerance: plus 0.005 inches, minus 0 inches
• Thickness tolerance: plus 0.001 inches, minus 0 inches
• Square tolerance: 0.003 inches

Compatibility

Designed as a direct-use pre-hardened flat bar for general industrial tooling, fixturing, and machine component fabrication applications calling for AISI/SAE Type 4142 alloy steel flat stock.

Installation Notes

This material is typically cut, drilled, or finish-machined by machinists using appropriate tooling rated for hardened alloy steel. Carbide or cobalt tooling is standard practice when machining pre-hardened 4142 stock. Thermal cutting methods such as plasma or oxy-fuel should be evaluated carefully, as the alloy content can affect heat-affected zone properties. Follow applicable shop safety procedures and wear appropriate PPE when cutting or grinding this material.