Drill Rod Tool Steels 81174278 Flat Stock 4142 Alloy Steel

Product Description

The DRILL ROD TOOL STEELS 81174278 is an AISI/SAE Type 4142 alloy steel pre-hardened flat stock bar measuring 18 inches long by 5/8 inch wide by 3/8 inch thick. This flat stock ships at a weight of 1.19 pounds and is supplied in a pre-hardened condition, eliminating the need for additional heat treatment before use. Tight tolerances are held throughout: length tolerance is +0.125 inches, width tolerance is +0.005 inches, thickness tolerance is +0.001 inches, and squareness tolerance is held to 0.003 inches. Machinists, toolmakers, and maintenance technicians use this bar stock in applications requiring strength, wear resistance, and dimensional consistency out of the box.

AISI/SAE 4142 chromium-molybdenum alloy steel is a widely used engineering material in industrial, metalworking, and general manufacturing environments. This flat stock is suited for fabrication of fixtures, guides, wear plates, tooling components, and structural machine parts where a pre-hardened condition is required to reduce shop processing steps. Its consistent cross-section and controlled tolerances make it a practical choice for precision parts that require minimal stock removal before final fit.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel construction for high strength and toughness
• Pre-hardened condition - no additional heat treatment required before use
• Tight thickness tolerance of +0.001 inches for precision fitment
• Width tolerance of +0.005 inches and squareness tolerance of 0.003 inches
• Length tolerance of +0.125 inches allows for clean finish cuts to final dimension
• Weighs 1.19 pounds - easy to handle as a single-piece flat bar

Compatibility

Designed as a standard pre-hardened flat bar for general machining, toolmaking, and fabrication applications requiring AISI/SAE Type 4142 alloy steel in flat stock form.

Installation Notes

This flat stock is intended for use by machinists, toolmakers, and fabricators working with conventional milling, drilling, or grinding equipment. Pre-hardened stock requires carbide or high-speed tooling for machining; conventional high-speed steel tooling may wear rapidly. Always secure the workpiece firmly before cutting or drilling operations. Appropriate personal protective equipment including eye protection and gloves should be worn when handling and machining steel bar stock.