Drill Rod Tool Steels 81174609 4142 Flat Stock 18x4x0.5in

Product Description

The DRILL ROD TOOL STEELS 81174609 is a pre-hardened alloy steel flat bar cut to 18 inches long, 4 inches wide, and 0.5 inches thick. Produced to AISI/SAE Type 4142 specification, this chromium-molybdenum alloy steel delivers a balance of high tensile strength, toughness, and through-hardening capability straight from the shelf. It ships at 10.15 pounds and is ready for secondary machining, grinding, or fabrication without additional heat treatment in most applications. Machinists, toolmakers, and fabricators working in job shops, maintenance facilities, and industrial production environments rely on 4142 pre-hardened flat stock for fixtures, tooling plates, dies, and structural machine components.

This flat stock is suited for applications where a through-hardened, dimensionally controlled steel blank is required. Common use cases include machined tooling fixtures, jig plates, brackets, mold bases, and wear components in light industrial machinery. The pre-hardened condition eliminates the need for in-house heat treatment for most tooling and fixturing work, reducing lead time on fabricated parts. Metalworking professionals across aerospace, automotive, general manufacturing, and maintenance-repair-overhaul shops regularly specify 4142 alloy flat bar for demanding structural and wear applications.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre-hardened condition
• 18 inches long x 4 inches wide x 0.5 inches thick - ready for immediate machining or fabrication
• Tight dimensional tolerances: length +0.125 inches, width +0.005 inches, thickness +0.001 inches, squareness 0.003 inches
• Ships as a single piece at 10.15 pounds
• Pre-hardened condition reduces or eliminates additional heat treatment in most tooling and fixture applications

Compatibility

Designed as a general-purpose pre-hardened alloy flat stock suitable for tooling, fixturing, jig plate fabrication, and structural machine components requiring AISI/SAE Type 4142 chromium-molybdenum alloy steel.

Installation Notes

Machining, grinding, or drilling of pre-hardened 4142 alloy steel requires carbide tooling and appropriate cutting speeds for hardened material. Secure the workpiece firmly before any cutting or grinding operation. Welding pre-hardened 4142 requires pre-heat and post-weld heat treatment procedures per applicable fabrication standards to avoid hydrogen cracking - consult AWS D1.1 or the material supplier guidelines before welding. Always use appropriate PPE including eye protection and gloves when handling and cutting steel flat stock.