Drill Rod Tool Steels 81174708 4142 Flat Stock 18x5/8

Product Description

The DRILL ROD TOOL STEELS 81174708 is a pre-hardened alloy steel flat stock bar manufactured to AISI/SAE Type 4142 specification. It measures 18 inches long, 5/8 inch wide, and 5/8 inch thick, weighing 1.98 pounds. The 4142 chromium-molybdenum alloy provides high strength, toughness, and wear resistance in the pre-hardened condition, making it suitable for tooling, fixtures, jigs, and machine components where through-hardening would be impractical in the field. Machinists, tool and die makers, and maintenance technicians work with this material when fabricating replacement parts or custom tooling that must hold close tolerances under load.

This flat stock is sized for direct use in light-duty tooling applications, maintenance repair fabrication, and prototype machining. The 18-inch length suits bench-scale work and can be cut to shorter lengths as required. The 5/8-inch square cross-section profile fits standard milling vises and surface grinder magnetic chucks without additional setup stock. Shops working on hydraulic press tooling, die components, shafts, pins, and support blocks commonly stock this size. The pre-hardened condition eliminates the need for a separate heat-treat step for most general-purpose applications.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre-hardened condition
• 18 inches long x 5/8 inch wide x 5/8 inch thick nominal dimensions
• Length tolerance: +0.125 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

Compatibility

Designed as a general-purpose pre-hardened flat stock for machining, tooling fabrication, and maintenance repair applications requiring AISI/SAE Type 4142 alloy steel material.

Installation Notes

Cutting and machining of pre-hardened 4142 alloy steel requires carbide tooling and appropriate feeds and speeds for hardened material. Eye protection, chip guards, and proper workholding are required during machining operations. Welding pre-hardened 4142 is not recommended without proper preheat and post-weld heat treatment procedures per applicable fabrication standards. Always verify final dimensions after machining, as the pre-hardened condition may cause minor stress relief movement on aggressive cuts.