Drill Rod Tool Steels 81174328 Alloy Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 81174328 is a pre hardened alloy steel flat stock bar cut to 18 inches long, 1.5 inches wide, and 0.375 inches thick. Manufactured to AISI/SAE Type 4142 specification, this chromium-molybdenum alloy steel delivers high toughness and fatigue resistance in the pre hardened condition, making it ready for machining, tooling, and fabrication work without additional heat treating. The bar weighs 2.86 pounds. Tight dimensional tolerances are held throughout: length tolerance is +0.125 inches, width tolerance is +0.005 inches, thickness tolerance is +0.001 inches, and square tolerance is 0.003 inches. Machinists, tool and die makers, and industrial fabricators rely on this material for demanding applications.

AISI 4142 pre hardened flat stock is commonly used in machine shops, maintenance and repair operations, and industrial fabrication environments. Typical applications include fixture components, machine parts, jigs, dies, tool holders, and structural members where elevated strength and wear resistance are required. The pre hardened condition eliminates the need for an additional hardening step after rough machining, saving time in production workflows. This flat bar is suited for both prototype and production use across general industrial and heavy equipment applications.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel for high toughness and fatigue resistance
• Pre hardened condition - ready to machine without additional heat treatment
• Tight width tolerance of +0.005 inches for consistent fit in tooling applications
• Thickness tolerance held to +0.001 inches for precise stock removal planning
• Square tolerance of 0.003 inches ensures reliable seating in fixtures and vises
• Single-piece quantity available - no minimum bulk order required

Compatibility

Designed as a standard-dimension pre hardened alloy steel flat bar suitable for general machining, tooling fabrication, and industrial maintenance applications requiring AISI/SAE Type 4142 material specification.

Installation Notes

Work with standard carbide tooling when machining pre hardened 4142 alloy steel, as high-speed steel tooling may wear prematurely. Always use appropriate personal protective equipment when cutting or grinding. Consult applicable shop safety standards and engineering drawings before modifying dimensions or applying secondary heat treatment processes.