Drill Rod Tool Steels 81173957 4142 Alloy Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 81173957 is a pre-hardened flat stock bar made from AISI/SAE Type 4142 alloy steel. It measures 18 inches long by 5.5 inches wide by 0.25 inches thick and weighs 6.98 pounds. Type 4142 is a chromium-molybdenum alloy known for high tensile strength, toughness, and wear resistance in the pre-hardened condition. This flat stock ships with tight tolerances: plus 0.125 inches on length, plus 0.005 inches on width, plus 0.001 inches on thickness, and a squareness tolerance of 0.003 inches. It is intended for use by machinists, tool and die makers, and metalworking shops requiring a ready-to-machine steel blank without additional heat treatment.

This flat stock is suited for fabricating fixtures, dies, tooling plates, brackets, and structural machine components where moderate-to-high hardness is required out of the box. The pre-hardened state eliminates the need for a separate hardening step in most toolroom and production applications. It is a common choice in job shops, industrial maintenance operations, and manufacturing environments handling medium-duty tooling or wear-resistant component work. Sold in single-piece quantity with no additional cutting required from the stated dimensions.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel for high strength and toughness
• Pre-hardened condition - ready to machine without additional heat treatment
• Tight length tolerance of plus 0.125 inches for consistent stock sizing
• Width tolerance of plus 0.005 inches and thickness tolerance of plus 0.001 inches for precision fitment
• Squareness tolerance of 0.003 inches ensures flat, predictable blanks
• Single-piece minimum order quantity for toolroom and low-volume needs

Compatibility

Designed as a standard pre-hardened flat bar for general toolroom, fixture, die, and machine component fabrication applications requiring AISI/SAE Type 4142 alloy steel stock.

Installation Notes

Cutting, drilling, and milling of pre-hardened 4142 alloy steel requires carbide or high-speed tooling rated for hardened material. Always wear appropriate PPE including eye protection and gloves when handling or machining steel flat stock. Secure the workpiece firmly before any cutting or grinding operation. Consult applicable shop safety standards and equipment manufacturer guidelines before machining.