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Chromoly steel commonly machined annealed or pre-hard.
Machine-readable reference
Structured metadata for formulas, tags, canonical status, and future diagram support.
Slug
steel-4140
Category
Materials & Alloys
Canonical
Yes
Updated
4/23/2026
Units
SFM
Tags
steel, 4140, alloy
Source
Machinery's Handbook, 31st ed., Materials
4140 is common in shafts, fixtures, and high-strength machine components. Pre-hard stock requires lower cutting speeds than annealed stock.
Reduce speed further when rigidity or tool overhang is poor.
Source: Machinery's Handbook, 31st ed., Materials