Drill Rod Tool Steels 81173486 4142 Flat Stock 18x8x0.125 in

Product Description

The DRILL ROD TOOL STEELS 81173486 is a pre hardened alloy steel flat stock bar conforming to AISI/SAE Type 4142 specification. Measuring 18 inches long by 8 inches wide by 0.125 inches thick, this piece is supplied in a ready-to-machine condition, eliminating the need for additional heat treatment in most applications. At 5.08 pounds, the bar is sized for use in tooling, fixtures, dies, and structural components that require consistent hardness throughout the cross section. Machinists, tool and die makers, and fabrication shops rely on 4142 alloy steel for its balance of toughness, wear resistance, and machinability in the pre hardened state.

This flat stock is suited for industrial and commercial fabrication environments where close-tolerance blanks are needed for jigs, fixtures, mold bases, machine components, and support plates. The controlled tolerances make it appropriate for direct use as a precision blank with minimal stock removal. It is a single-piece unit suitable for small-shop orders or prototype work as well as production runs requiring consistent material properties across multiple pieces.

Key Features

• AISI/SAE Type 4142 alloy steel composition for consistent hardness and toughness in the pre hardened condition
• Pre hardened flat stock eliminates additional heat treat steps before machining
• Length tolerance of plus 0.125 inches ensures full usable length on every piece
• Width tolerance of plus 0.005 inches supports accurate layout and machining
• Thickness tolerance of plus 0.001 inches for precise cross-section control
• Square tolerance of 0.003 inches for reliable reference surface quality

Compatibility

Designed as a standard AISI/SAE Type 4142 pre hardened alloy steel flat stock blank for use in general tooling, fixture, and fabrication applications where close-tolerance steel bar stock is required.

Installation Notes

Cutting, drilling, and milling operations on pre hardened 4142 steel require carbide tooling and appropriate speeds and feeds for hardened alloy steel. Always secure the workpiece properly before machining and use appropriate personal protective equipment. Consult applicable shop safety standards and material safety data when cutting or grinding this alloy. De-burr all edges after cutting to prevent handling injuries.