440C — Machining & Properties
Typical properties, what 440C is like on a machine tool, what it gets used for, and the tolerance and finishes we hold on it — from a shop that actually machines it, not a datasheet aggregator. Every figure here drives our own calculators.
Machining 440C
Machinability is rated difficult — a genuinely demanding material — rigid setups, premium tooling and conservative parameters, with cycle time and tool wear to match. Austenitic grades (303, 304, 316) work-harden during cutting. Sharp tooling, correct feeds and speeds, and no dwelling are essential. Martensitic and PH grades should be machined in the annealed condition where possible, with final heat treatment applied post-machining to minimise distortion.
Our standard achievable tolerance on 440C is ±0.010mm under normal conditions, with tighter tolerances on critical features agreed at quotation. Standard finishes: Hard chrome, PVD coating. Full material traceability with MTR and CoC documentation on every order.
Typical applications
Ball bearings, cutting edges, valve seats, surgical blades.
Use 440C in our free tools
Other stainless steel grades we machine: 303 · 304 / 304L · 316 / 316L · 17-4 PH (630) — all 50 grades.
440C — FAQ
What is the density of 440C?
7.65 g/cm³ (typical). That is 7650 kg/m³ — our metal weight calculator uses exactly this figure for 440C.
What is the tensile strength of 440C?
Typically 1970 MPa in the heat-treated condition stated. Treat it as a typical value, not a specification — the Material Test Report supplied with your order states the actual certified figures for the batch.
Is 440C easy to machine?
Its machinability is rated difficult — a genuinely demanding material — rigid setups, premium tooling and conservative parameters, with cycle time and tool wear to match.
What is 440C used for?
Typical applications: Ball bearings, cutting edges, valve seats, surgical blades.
What tolerance can be held when machining 440C?
Our standard achievable tolerance on 440C is ±0.010mm under normal conditions (ISO 2768-f general tolerancing). Tighter tolerances on critical features can be agreed at quotation for specific geometries.
Can Dalloway machine 440C?
Yes — we machine 440C in-house on 3, 4 and 5-axis milling and CNC turning, from single prototypes to production, with MTR and CoC documentation standard. Typical finishes: Hard chrome, PVD coating.
Send Your Drawing for a Same-Day Quote
Talk directly to the engineers who will machine your parts — no account managers, no trading-company markups. Complimentary DFM review with every enquiry.