Drill Rod Tool Steels 81174443 Alloy Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 81174443 is a pre hardened alloy steel flat stock bar conforming to AISI/SAE Type 4142 specification. It measures 18 inches long, 8 inches wide, and 0.375 inches thick, and weighs 15.23 pounds. Type 4142 is a chromium-molybdenum alloy steel known for its high strength, toughness, and fatigue resistance in the pre hardened condition. This flat stock is ready for machining, tooling, jig fabrication, and structural applications where a through-hardened material is required without additional heat treatment. Machinists, tool-and-die makers, and maintenance technicians are the typical end users of this material form.

This flat stock is suited for general industrial and maintenance machining applications where pre hardened alloy steel is specified. Typical uses include fixture plates, support brackets, wear components, tooling bases, and die components. The pre hardened condition eliminates the need for a post-machining heat treat cycle, making it a practical choice for short-run and prototype work as well as production tooling environments. It is sold as a single piece per package.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre hardened condition
• 18 x 8 x 0.375 inch nominal dimensions ready for machining to final size
• Length tolerance of plus 0.125 inches, width tolerance of plus 0.005 inches, thickness tolerance of plus 0.001 inches
• Square tolerance of 0.003 inches for consistent flatness and squareness
• No post-machining heat treatment required - saves time and reduces distortion risk
• Single-piece minimum order quantity for low-volume and job-shop procurement

Compatibility

Designed as an OEM-style drop-in flat stock replacement or raw material supply for applications specifying AISI/SAE Type 4142 pre hardened alloy steel flat bar in 18 x 8 x 0.375 inch form.

Installation Notes

This material should be worked by qualified machinists using tooling rated for hardened alloy steel. Standard carbide cutting tools are recommended for milling, drilling, and turning operations on pre hardened 4142 stock. Welding pre hardened 4142 requires pre-heat and post-weld heat treatment procedures per applicable welding codes to avoid cracking - consult the relevant AWS standard before attempting weld repair or fabrication. Handle and store flat stock horizontally on a clean, supported surface to prevent warping or edge damage.