Drill Rod Tool Steels 81175523 Flat Stock 4142 Alloy

Product Description

The DRILL ROD TOOL STEELS 81175523 is a pre-hardened alloy steel flat stock bar conforming to AISI/SAE Type 4142 material specification. It measures 36 inches long, 3/4 inch wide, and 3/16 inch thick, with a finished weight of 1.43 pounds. Type 4142 is a chromium-molybdenum alloy steel known for its through-hardening characteristics, fatigue resistance, and toughness, making it a standard choice for tooling, fixtures, jigs, and structural components requiring consistent hardness without post-machining heat treatment. Machinists, tool and die makers, and maintenance mechanics work with this material in job shop and industrial settings.

This flat stock is suited for fabricating wear plates, brackets, guides, keys, slides, and custom tooling components in manufacturing, maintenance, and repair operations. The pre-hardened condition eliminates the need for heat treatment after machining, saving time in production workflows. The bar ships in single-piece quantity at 36 inches, ready for layout and cutting to final dimensions on a band saw or cold saw.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre-hardened condition
• Nominal dimensions: 36 inches long, 3/4 inch wide, 3/16 inch thick
• Length tolerance: +0.250 inches / -0.000 inches
• Width tolerance: +0.005 inches / -0.000 inches
• Thickness tolerance: +0.001 inches / -0.000 inches
• Square tolerance: 0.003 inches for consistent cross-section geometry
• Pre-hardened condition reduces fabrication steps versus annealed stock

Compatibility

Designed as a standard flat bar replacement or raw material stock for applications requiring AISI/SAE Type 4142 pre-hardened alloy steel in 3/4 inch wide by 3/16 inch thick bar form.

Installation Notes

Cutting and machining of pre-hardened 4142 alloy steel requires carbide tooling rated for hardened stock. Always wear appropriate PPE including eye protection and gloves when cutting or grinding. Clamp the bar securely before any cutting operation to prevent movement and maintain dimensional accuracy. Welding of pre-hardened alloy steel is not recommended without proper preheat and post-weld heat treatment procedures per applicable welding standards.