O1 Tool Steel: Oil-Hardening Tooling

O1 is an oil-hardening cold-work tool steel; Uddeholm Arne is a manufacturer example in this class. Material reference.

Oil-Hardening Tooling

For a short-run punch or gauge, compare the complete machining and heat-treatment route with buying a pre-hardened alternative. Give dimensional stability an explicit acceptance criterion instead of assuming the final hardness target will protect precision fits.

Manufacturing and acceptance checks

Quote annealed stock separately from a finished hardened tool. Include grinding allowance, datum surfaces and the permitted size change after treatment. Require the actual stock supplier's treatment recommendation and inspect the finished edge and fit; do not apply a brochure cycle blindly to a different section.

Compare related options

• O2 Tool Steel
• S7 Tool Steel

Reference and scope

Uddeholm: tool-steel technical data and processing references provides material or specification background. The checks above are purchasing guidance; final acceptance values must come from the agreed grade, product specification and condition.

Send a drawing and material requirements for review. Include quantity, critical dimensions and the inspection evidence required with delivery.