Drill Rod Tool Steels 81175069 4142 Flat Stock 18x1x1

Product Description

The DRILL ROD TOOL STEELS 81175069 is a pre-hardened alloy steel flat stock bar made to AISI/SAE Type 4142 specification. It measures 18 inches long by 1 inch wide by 1 inch thick and weighs 5.08 pounds. This material is supplied in a pre-hardened condition, making it ready for applications that require consistent through-hardness without additional heat treatment. Tight dimensional tolerances are held throughout: length tolerance is +0.125 inch, width tolerance is +0.005 inch, thickness tolerance is +0.001 inch, and square tolerance is 0.003 inch. Machinists, toolmakers, and fabricators working in machine shops, maintenance departments, and production environments use this stock for tooling, fixtures, wear parts, and general structural components.

AISI/SAE 4142 is a chromium-molybdenum alloy steel valued for its high strength, good toughness, and machinability in the pre-hardened state. This flat stock is suited for fabrication of dies, jigs, holders, shafts, and machine components in industrial and manufacturing settings. The 18-inch length makes it practical for single-piece or short-run part production. It is appropriate for both light-duty prototyping and heavier production machining where tight tolerances and consistent hardness are required.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel construction
• Pre-hardened condition - no additional heat treatment required before use
• Length tolerance of +0.125 inch for consistent stock sizing
• Width tolerance of +0.005 inch and thickness tolerance of +0.001 inch for close-tolerance machining
• Square tolerance held to 0.003 inch for accurate setups
• Ready for milling, drilling, turning, and grinding operations

Compatibility

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

Installation Notes

Machining of pre-hardened 4142 alloy steel should be performed by qualified machinists using appropriate cutting tools rated for hardened steel. Secure the workpiece firmly in a vise or fixture before cutting operations to prevent movement and maintain tolerance. Carbide tooling is typically preferred over high-speed steel when machining pre-hardened stock. Follow applicable shop safety practices including eye protection, chip guards, and proper coolant use during machining operations.