Drill Rod Tool Steels 81176430 Flat Stock 4142 Alloy

Product Description

The DRILL ROD TOOL STEELS 81176430 is a pre-hardened alloy steel flat stock bar conforming to AISI/SAE Type 4142 specification. It measures 36 inches long, 5/8 inch wide, and 1/2 inch thick, and weighs 3.17 pounds. Type 4142 is a chromium-molybdenum alloy steel known for high tensile strength, toughness, and good machinability in the pre-hardened condition. This flat stock is used by machinists, toolmakers, and maintenance technicians who need a ready-to-machine steel bar without additional heat treatment. Tolerances are tightly controlled: length is held to plus 0.250 inches, width to plus 0.005 inches, and thickness to plus 0.001 inches.

This flat stock is suited for general tooling, fixture fabrication, machine components, jigs, and wear parts in industrial and manufacturing environments. The pre-hardened condition eliminates the need for a separate hardening operation, making it practical for shops producing replacement parts, custom tooling inserts, or structural machine components where dimensional consistency and material hardness are required out of the box. It is sold as a single piece and is ready to cut, mill, or grind to final dimension.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel in pre-hardened condition
• Dimensions: 36 inches long x 5/8 inch wide x 1/2 inch thick
• Length tolerance: plus 0.250 inches; width tolerance: plus 0.005 inches; thickness tolerance: plus 0.001 inches
• Square tolerance: 0.003 inches for consistent cross-section geometry
• Weight: 3.17 pounds per piece
• Sold as a single piece (minimum order quantity: 1)

Compatibility

Designed as a general-purpose pre-hardened flat bar for use in machining, toolmaking, and fabrication applications where AISI/SAE Type 4142 alloy steel stock is specified.

Installation Notes

Machining of pre-hardened 4142 alloy steel requires carbide tooling and appropriate feeds and speeds for hardened material. Always follow standard shop safety practices including eye protection and secure workholding when sawing, milling, or grinding. Secondary heat treatment is not required for most tooling applications, but consult material specification sheets if case hardening or additional tempering is needed for the end use. Handle cut edges carefully as pre-hardened steel bar stock can have sharp burrs after machining.