Drill Rod Tool Steels 81175259 Pre Hardened Flat Stock

Product Description

The DRILL ROD TOOL STEELS 81175259 is a pre hardened alloy steel flat stock bar supplied in AISI/SAE Type 4142 chromoly steel. It measures 36 inches long by 0.5 inches wide by 0.125 inches thick and weighs 0.64 pounds. This material ships in a pre hardened condition, meaning no further heat treatment is required before use. Machinists, toolmakers, and fabricators use 4142 alloy flat stock for tooling fixtures, keys, brackets, wear plates, and structural components that demand higher hardness and strength than mild cold-rolled bar. The close-tolerance dimensions make it suitable for precision applications where fit and flatness matter.

Type 4142 pre hardened flat stock is commonly used in job shop machining, tool and die work, and industrial fabrication environments. The flat profile and pre hardened condition reduce setup time when producing blanks for fixtures, gibs, and machine components. It is stocked in single-piece quantities, making it practical for low-volume toolroom use as well as production runs. Typical end users include tool and die makers, maintenance machinists, and industrial fabricators working in manufacturing and mechanical assembly facilities.

Key Features

• AISI/SAE Type 4142 chromoly alloy steel with pre hardened condition - no additional heat treat required
• Nominal dimensions: 36 inches long, 0.5 inches wide, 0.125 inches thick
• Length tolerance: +0.250 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 flatness and squareness across the bar

Compatibility

Designed as a general-purpose pre hardened flat bar for use in toolroom, fixture-building, and industrial fabrication applications requiring AISI/SAE Type 4142 alloy steel in flat stock form.

Installation Notes

Use carbide or high-speed tooling when machining pre hardened 4142 alloy steel, as the elevated hardness will accelerate wear on standard tooling. Secure the workpiece firmly in a vise or fixture before cutting or grinding to maintain dimensional accuracy. Welding pre hardened alloy steel requires pre-heat and post-weld procedures to avoid cracking - consult applicable welding standards before attempting. Always wear appropriate PPE including safety glasses and cut-resistant gloves when handling and processing flat bar stock.