Drill Rod Tool Steels 66821 O1 Tool Steel Flat Stock

Product Description

The DRILL ROD TOOL STEELS 66821 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who require a reliable, machinable steel blank before heat treatment. Conforming to AISI Type O1 material specification, this flat stock measures 3/16 inch thick, 2-1/2 inches wide, and 36 inches long and weighs 4.84 pounds. Thickness tolerance is held to plus or minus 0.001 inches, giving precise stock removal calculations before final grinding. O1 tool steel is widely used for punches, dies, gauges, and cutting tools where good toughness and moderate wear resistance after hardening are required.

This flat stock is suited for job shops, tool-and-die operations, and maintenance-repair shops that machine blanks to near-net shape before oil-quench hardening. The 36-inch length provides enough material for multiple short blanks or a single long tool form. The consistent width and thickness tolerances make it compatible with surface grinder setups for final sizing after hardening and tempering. It is appropriate for both one-off tooling and short-run production blanks.

Key Features

• AISI Type O1 oil-hardening tool steel - good machinability in the annealed state and reliable response to oil quench
• Thickness tolerance of plus or minus 0.001 inches for tight stock allowance control
• Width tolerance of plus 0.005 inches, minus 0.000 inches
• Length tolerance of plus 0.5 inches for full usable length on every bar
• Squareness held to 0.003 inches on edges and 0.004 inches per inch of thickness on ends
• Single-piece minimum order quantity - no multi-bar commitment required

Compatibility

Designed as a standard O1 tool steel flat stock blank suitable for toolmaking, die making, punch fabrication, and gauge construction applications requiring AISI Type O1 oil-hardening material.

Installation Notes

Machining and hardening of tool steel should be performed by qualified machinists or tool-and-die makers familiar with oil-quench heat treatment procedures. Always follow applicable shop safety protocols when cutting, grinding, or heat treating tool steel, including proper eye protection and ventilation. Allow the bar to reach a stable temperature before precision measuring after thermal operations. Consult the material manufacturer's heat treatment guidelines for proper austenitizing and tempering temperatures specific to AISI O1 before processing.