Bar sizes and condition
Published range: 20–400 mm diameter and 3–12 m length. Quenched and tempered, with black, peeled or machined surfaces. Confirm the required size and property combination in the quotation.
Estimate bar weight →
Grade route 01
42CrMo4 / 4140QT round bar
JOTAIN supplies 4140 and 42CrMo4 round bars with quenching and tempering, cutting, peeling and machining for shafts, rods and heavy-duty parts.
Product supply
4140 / 42CrMo4 QT round bar supply
Order round bars or machined blanks with the heat treatment, surface condition and inspection documents specified together.
Heat treatment and machining
JOTAIN heat treats, cuts and machines bars and blanks for shafts, rods and pins. Send finished drawings for machining allowance and property review.
QT enquiry checklist (English PDF) →Inspection and documents
Agree the required tests and documents with the order, including methods, sampling and acceptance criteria. The redacted MTC examples show report format and heat identification.
View inspection documents →Request a quotation
Send the controlling standard, diameter, length, quantity, QT requirements, surface condition and destination.
Grade specifications
Confirm the grade and condition before comparing prices.
Cross-references are a starting point. The drawing standard, condition, size and inspection scope define the order.
- 01Grade42CrMo4 / 4140
- 02StandardConfirm standard and edition
- 03ConditionQuenched and tempered (QT)
- 04PartHydraulic rods
- 05ReleaseChemical composition analysis
Standard map
Common cross-references
- ISO / EN route
- 42CrMo4 / 1.7225; name the required standard and edition
- SAE route
- SAE 4140 chemistry under SAE J404
- ASTM product route
- A322 alloy bars or A434/A434M QT bars, when the order invokes them
- JIS
- SCM440; confirm the governing JIS standard
- GB
- 42CrMo; confirm the governing GB standard
Supply window
Published specification
- Form
- Round bar
- Diameter
- 20 - 400 mm
- Length
- 3 - 12 m
- Condition
- Quenched and tempered (QT)
- Surface
- Black / Peeled / Machined
Property reference
Mechanical route
- Property route
- State the product standard, delivery condition or strength class, and bar diameter
- Test basis
- State the test position, sampling plan, and required result document
- ASTM QT route
- Use the A434/A434M class and size range when that standard controls the order
Chemistry reference
- 42CrMo4
- Use the chemistry table in the named ISO or EN product standard
- SAE 4140
- Use SAE J404 for the chemical designation
- Order check
- Do not merge chemistry limits from separate standards
Matched components
Connect the material to the part.
Application and release
Key details for your order.
- Hydraulic cylinder rods and piston rods
- Wind power shafts and flanges
- Marine drive shafts and coupling components
- Heavy-duty gears, spindles, and mechanical shafts
- Chemical composition analysis
- Mechanical testing
- Ultrasonic testing (UT)
- Dimensional inspection and buyer-appointed third-party inspection planning
RFQ checks
Questions buyers ask first.
Should the RFQ say 42CrMo4, 4140, SCM440, or 42CrMo?
State the required project standard first, then list acceptable cross-reference grades if they are allowed. This helps align chemistry, heat-treatment condition, mechanical properties, inspection, and certificate wording with the request.
Is 42CrMo4 / 4140 normally requested in QT condition?
42CrMo4 / 4140 is often reviewed in quenched and tempered condition for high-load parts, but the required delivery condition should be stated by the buyer. Annealed, normalized, black, peeled, or machined routes may need separate review.
What documents should be requested for 42CrMo4 / 4140 round bar?
Common document requests include MTC, chemical composition, mechanical testing, heat number traceability, dimensional inspection, UT report if specified, third-party inspection if specified, packing list, and shipment documents.
Technical references
Go deeper only where needed.
42CrMo4 / 4140 buying guideReview required standard, acceptable cross-reference grades, condition, applications, and inspection points.42CrMo4 vs CK45 hydraulic rodsCompare 42CrMo4 / 4140 and CK45 / 1045 for rod routes.Steel selection for heavy-duty shaftsReview how 42CrMo4 fits shaft and load-bearing part RFQs.
Grade RFQConfirm the standard before quotation.
Send the grade standard, size, quantity, condition, application, inspection documents and destination.