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420 · UNS S42000 · confirm your EN variant
420 Stainless Steel for Your Wear-Related Mechanical Parts
Start with the carbon variant, final hardness and mating feature.
For your 420 stainless steel machining project, define the material condition and inspection state that your component needs.
One 420 Name Can Cover Different European Variants
Stainless steel 420 is a hardenable martensitic family. Do not release an order from the abbreviated name alone. European references include EN 1.4021, 1.4028, 1.4031 and 1.4034 with different supplier typical chemistry.
Exact variant
Retain the full grade, product standard and carbon requirement.
Delivery & final state
Identify supplied condition, required final condition and the processing sequence.
Functional acceptance
Show the mating surfaces, wear-related requirement and inspection evidence.
UNS S42000 helps you locate the family; it does not approve every European variant as interchangeable.
420 Stainless Steel Composition: Specify the Variant
420 Variants: Selected Typical Carbon
Outokumpu Dura reference · mass % · axis 0–0.50%
1.4021
0.20%
1.4028
0.30%
1.4031
0.38%
1.4034
0.45%
| Dura reference | EN | Typical C % | Typical Cr % |
|---|---|---|---|
| 420/4021 | 1.4021 | 0.20 | 13.0 |
| 420/4028 | 1.4028 | 0.30 | 12.5 |
| 420/4031 | 1.4031 | 0.38 | 13.5 |
| 420/4034 | 1.4034 | 0.45 | 13.7 |
Compare the same supplier reference and product scope. Different carbon values are a reason to check the drawing, not permission to substitute.
Keep Your 420 Material Record Separate from Reference Data
| Selected Carpenter type analysis | Mass % |
|---|---|
| Carbon | ≥0.15 |
| Chromium | 12.00–14.00 |
| Manganese / Silicon | ≤1.00 each |
| Phosphorus / Sulfur | ≤0.040 / ≤0.030 |
| Iron | Balance |
This separate 420 supplier analysis is not the same dataset as the Dura typical-chemistry chart. Your controlled specification and actual lot record govern acceptance.
For 420 stainless steel ASTM A276, confirm the applicable bar/shape scope, revision, exact grade and condition.
3 Decisions for Your Heat-Treatment and Finishing Sequence
For 420 stainless steel heat treatment, specify the final condition and required evidence. Read 420 stainless steel properties with the variant, stock form and treatment state.
Before cutting
Confirm incoming stock, material identity and any processing allowance.
Before hardening
Agree the governing treatment route and surfaces that must remain recoverable.
Before release
Inspect the functional fit, final surface and required material evidence.
Discuss 420 stainless steel grinding when the finished feature requires a reviewed grinding route. A material name alone does not define one final hardness.
Connect Your Cam, Journal and Bore to One Inspection State
For 420 stainless steel turning services, show the datum scheme and the relationships that must hold after all processing.
420 stainless steel turning for 420 stainless steel shafts, 420 stainless steel bushings and 420 stainless steel spacers needs explicit fits, shoulder lengths and surface acceptance.
For 420 stainless steel machined parts, identify any finishing operations after hardening.
CNC Turning →
Make Your Milled and Cross-Drilled Features Inspectable
For 420 stainless steel CNC machining, provide the current condition and intended final state before the route is fixed.
For 420 stainless steel milling, show pocket depth, wall transitions and fixture access. Relate 420 stainless steel drilling and 420 stainless steel tapping to burr control and useful feature depth.
420 stainless steel machinability depends on the variant, condition and actual cut; compare proposed routes against your geometry.
CNC Milling →
Small Threaded Parts Still Need Final-Condition Control
For 420 stainless steel Swiss machining and 420 stainless steel screw machine parts, retain the material variant and condition in the route.
For 420 stainless steel threaded parts, specify the standard, engagement, relief and final functional fit. Identify cross-hole burr access before release.
Swiss Machining →
Define the Surface Your Mating Part Will See
For 420 stainless steel polishing, define the functional faces, appearance reference and permitted surface changes.
For 420 stainless steel passivation, agree the cleaning, treatment compatibility and verification required for the actual component.
For 420 stainless steel laser marking, identify content, location and restrictions on mating or exposed faces. Surface brightness is not evidence of corrosion suitability.
Surface Finishing Review → · Laser Marking →
4 Checks Before Your Mechanical Part Is Released
01 · Variant & condition
Keep the carbon variant and final condition together
Keep carbon variant, stock condition and final requirement on the same release.
Specify the exact standard and variant before requesting hardness. The three machining stages are illustrative, not a heat-treatment test.
≥ 0.15%Carbon · mass % · Carpenter 420 minimum
A broad 420 reference minimum; it does not make all European 420-family carbon variants interchangeable.
Read the source and conditions →
02 · Cam & datum
Locate the cam from its functional interfaces
Connect cam geometry, journal axis and locating face to the functional requirement.
Show the eccentric feature, bore and mounting references together. Define the inspection state after the agreed thermal route.
12–14%Chromium · mass % · supplier chemistry range
Grade chemistry provides material context; eccentricity, runout and load acceptance come from your drawing.
Read the source and conditions →
03 · Finish allowance
Agree finishing stock for the selected variant
Agree the sequence and any finishing allowance around heat treatment.
Identify surfaces for grinding, honing or final machining. Match allowance to the heat route and actual part geometry.
S42000UNS identifier · exact variant still required
A family identifier does not prescribe one finishing allowance or hardness. Keep the complete specification on the order.
Read the source and conditions →
04 · Exposure & joining
Connect exposure and joining to the released part
Describe environment and any weld requirement before material approval.
Show the actual contact medium, temperature, cleaning and joint. Review welding and any subsequent treatment separately.
1.4021 / 1.4028Examples of distinct European 420-family grades
These are not blanket equivalents of every 420 requirement; compare the carbon variant and product specification.
Read the source and conditions →Bring Your Final Condition into the Inspection Plan
Material
Exact variant, product standard and lot identity.
Treatment
Specified final condition and required verification.
Geometry
Journals, bores, cam faces and inspection state.
Release
Surface, revision, exceptions and packing.
Compare Your Design Need Before Substitution
| Your comparison | Required review |
|---|---|
| 420 vs 410 stainless steel | Compare the exact carbon requirement, final condition and wear-related design need. |
| 420 vs 440C stainless steel | Keep the full grade, heat route and acceptance explicit; the names do not establish equivalence. |
| 420 vs 416 | Review machining, hardness, joining and actual exposure against the same finished drawing. |
| Corrosion-sensitive part | State medium, temperature, cleaning and retained moisture; hardness alone does not decide suitability. |
5 Inputs for Your 420 Finished-Part Estimate
For your 420 stainless steel machining quote, compare the complete scope. When reviewing a 420 stainless steel CNC parts manufacturer, connect process, final condition and evidence to your drawing.
Variant
Material specification and stock form.
Geometry
Cam faces, bores, threads and access.
Heat route
Incoming state, final condition and sequence.
Surface
Finishing, cleaning and protection.
Release
Quantity, inspection and packing.
For 420 stainless steel prototype machining, define what the sample must prove and how the final production variant and condition will be represented.
Your Questions Before Ordering 420 Parts
Is 420 stainless steel magnetic?
Yes, this martensitic family is magnetic. Use agreed material records to verify grade and condition; a magnet alone is insufficient.
Does 420 stainless steel rust?
It can corrode under unsuitable exposure or surface condition. Review the actual medium, temperature, cleaning and final state.
Can 420 stainless steel be welded?
Welding requires a specific review because this air-hardening grade is seldom welded. Confirm procedure, thermal route and final material and dimensional acceptance.
Can 420 stainless steel be hardened?
Yes. The exact variant and treatment determine the result. Specify the required final condition and verification rather than assuming one hardness for all 420 parts.
What is 420 stainless steel used for?
It may be considered for cams, shafts, guide bushings and other mechanical parts where the specified material suits the design. This is not application certification.
How much does 420 stainless steel machining cost?
Share the drawing, exact variant, stock form, conditions, quantity, finish and evidence requirements for a finished-part comparison.
Is every European 420 variant interchangeable?
No. The Dura examples have different typical carbon and chromium values. Retain the full specification and obtain substitution permission.
Does 420F identify the same machining material?
Do not assume so. 420F is a modified free-machining variation and needs separate material and application review.
6 Inputs for Your Custom 420 Stainless Steel Parts
For 420 stainless steel machining services, send the controlled drawing with the exact material and final acceptance.
Drawing
Revision and CAD.
Material
Variant, form and product standard.
Condition
Incoming and final state.
Features
Fits, cam faces, threads and joints.
Quantity
Prototype and repeat pattern.
Evidence
Treatment, surface and inspection records.
