Drill Rod Tool Steels 81173684 Alloy Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 81173684 is an AISI/SAE Type 4142 alloy steel pre-hardened flat stock bar used in toolmaking, fixture building, die work, and general metalworking applications. The bar measures 18 inches long, 4 inches wide, and 3/16 inch (0.1875 inches) thick, and weighs 3.81 pounds. Type 4142 is a chromium-molybdenum alloy steel known for high strength, good toughness, and resistance to wear and fatigue in the pre-hardened condition. Machinists, tool and die makers, and fabricators use this material where a ready-to-use hardened flat stock is needed without additional heat treatment.

This flat stock is suited for residential and commercial metalworking shops, maintenance departments, and job-site fabrication requiring a structural or tooling-grade steel bar. Typical applications include wear plates, support brackets, die components, jigs, fixtures, and machine bases. The pre-hardened condition reduces processing steps, making it practical for low-volume or one-off part production. Stock length tolerance of plus 0.125 inches and close width and thickness tolerances support direct use with minimal material removal.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in a pre-hardened condition
• Dimensions: 18 inches long, 4 inches wide, 3/16 inch (0.1875 inches) thick
• Length tolerance: plus 0.125 inches; width tolerance: plus 0.005 inches; thickness tolerance: plus 0.001 inches
• Square tolerance: 0.003 inches for consistent geometry across the bar
• Pre-hardened condition eliminates the need for additional heat treatment before use
• Sold as a single piece with no minimum order beyond one unit

Compatibility

Designed as a standard AISI/SAE Type 4142 pre-hardened alloy steel flat stock suitable for general toolmaking, die work, and structural fabrication applications where this material specification is required.

Installation Notes

Cutting and machining of pre-hardened 4142 alloy steel requires carbide tooling and appropriate feeds and speeds for hardened material. Machinists and fabricators should use proper workholding and eye protection when cutting or grinding this stock. Welding pre-hardened alloy steel is not recommended without consulting applicable welding procedures, as heat input can alter mechanical properties. Always follow shop safety practices and applicable codes when working with alloy steel stock.