Drill Rod Tool Steels 81173825 Flat Stock 4142 Alloy

Product Description

The DRILL ROD TOOL STEELS 81173825 is an AISI/SAE Type 4142 alloy steel pre-hardened flat stock bar intended for use in tooling, fixturing, die making, and general machining applications. Measuring 18 inches long, 3/4 inch wide, and 1/4 inch thick, this flat bar ships in a pre-hardened condition, eliminating the need for additional heat treatment before use. The 4142 chromium-molybdenum alloy composition delivers high tensile strength, good toughness, and solid wear resistance. Machinists, tool-and-die makers, and fabricators working in production and job-shop environments are the primary users of this material. The piece weighs approximately 0.95 pounds.

This flat stock is suited for applications requiring a hard, dimensionally consistent steel bar in a ready-to-machine or finish-grind state. Typical uses include die components, support blocks, wear plates, keys, and custom tooling inserts. The pre-hardened condition makes it a practical choice when lead time or shop capacity prevents in-house heat treating. It is sold in single-piece quantity and is appropriate for both prototype work and low-volume production runs where precision tolerances are required.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel for high strength and toughness
• Pre-hardened condition - no post-purchase heat treatment required
• Length tolerance: plus 0.125 inch, minus 0.000 inch
• Width tolerance: plus 0.005 inch, minus 0.000 inch
• Thickness tolerance: plus 0.001 inch, minus 0.000 inch
• Square tolerance: 0.003 inch for consistent geometry across the cross-section

Compatibility

Designed as a standard pre-hardened flat bar for tooling, die, and fixturing applications requiring AISI/SAE Type 4142 alloy steel in flat stock form.

Installation Notes

Cutting, drilling, and grinding operations on pre-hardened 4142 steel require carbide or high-speed tooling rated for hardened material. Operators should use appropriate personal protective equipment and ensure workholding is secure before machining. Consult material safety data sheets for grinding dust and cutting fluid handling requirements. Follow applicable shop safety codes when processing hardened steel stock.