Drill Rod Tool Steels 81174542 4142 Flat Stock 18x1.5x0.5in

Product Description

The DRILL ROD TOOL STEELS 81174542 is a pre-hardened alloy steel flat stock bar conforming to AISI/SAE Type 4142 specification. It measures 18 inches long by 1-1/2 inches wide by 1/2 inch thick and weighs 3.81 pounds. The 4142 chromium-molybdenum alloy composition provides high strength, toughness, and wear resistance in the as-supplied condition, eliminating the need for through-hardening before use. Tolerances are held to plus 0.125 inches on length, plus 0.005 inches on width, plus 0.001 inches on thickness, and 0.003 inches square. Machinists, toolmakers, and industrial maintenance technicians work with this material for demanding fabrication tasks.

This flat stock is suited for fabricating jigs, fixtures, dies, punches, shafts, and machine components where pre-hardened material reduces heat-treat distortion risk. It is used in job shops, tool rooms, and industrial maintenance environments. The rectangular cross-section allows direct layout and machining without additional stock removal steps on all four faces, making it a practical starting form for milling, drilling, and grinding operations.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel for high strength and toughness
• Pre-hardened condition - no additional heat treatment required before machining
• Tight dimensional tolerances: plus 0.001 inches thickness, plus 0.005 inches width, plus 0.125 inches length
• Square tolerance held to 0.003 inches for consistent flatness and geometry
• Flat stock form simplifies layout, fixturing, and multi-face machining operations

Compatibility

Designed as a general-purpose pre-hardened flat stock for tool room, die shop, and industrial fabrication applications requiring AISI/SAE 4142 alloy steel in rectangular bar form.

Installation Notes

Machining of pre-hardened 4142 alloy steel requires carbide or high-speed steel tooling appropriate for hardened material. Secure the workpiece firmly in a vise or fixture before cutting operations. Follow your shop safety program for guarding, chip control, and eye protection when working with alloy steel bar stock. Consult material safety data and applicable shop codes before grinding or welding pre-hardened stock.