Drill Rod Tool Steels 81173411 Alloy Steel Flat Stock 4142

Product Description

The DRILL ROD TOOL STEELS 81173411 is a pre-hardened alloy steel flat stock bar conforming to AISI/SAE Type 4142 specification. It measures 18 inches long, 3 inches wide, and 0.125 inches thick, and weighs 1.9 pounds. Type 4142 is a chromium-molybdenum alloy steel known for high strength, toughness, and wear resistance in the pre-hardened condition. This flat stock is used by machinists, toolmakers, and fabricators who need consistent material dimensions with close manufacturing tolerances for tooling, fixtures, jigs, and structural components.

This flat bar is suited for applications in general machining, tool and die work, and custom fabrication where a pre-hardened condition eliminates the need for additional heat treatment. Typical end uses include die components, machine parts, fixtures, and wear-resistant structural elements. The material arrives ready for machining, grinding, or further surface finishing without requiring post-purchase hardening operations.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre-hardened condition
• Nominal dimensions: 18 inches long, 3 inches wide, 0.125 inches thick
• Length tolerance: plus 0.125 inches, minus zero
• Width tolerance: plus 0.005 inches, minus zero
• Thickness tolerance: plus 0.001 inches
• Square tolerance: 0.003 inches for precise fit in close-tolerance applications

Compatibility

Designed as a standard pre-hardened flat stock for use in tool and die making, fixture fabrication, and general machining applications requiring AISI/SAE Type 4142 alloy steel material.

Installation Notes

Cutting and machining of pre-hardened 4142 alloy steel should be performed by qualified machinists or toolmakers using appropriate carbide or high-speed tooling rated for hardened steel. Secure workholding is required to maintain dimensional accuracy during cutting, grinding, or milling operations. Follow all applicable shop safety practices including proper PPE when cutting or grinding steel stock. No welding or heat treatment is implied or recommended without engineering review, as post-process thermal changes may affect the pre-hardened material properties.