Buyer problem
Buyers need to avoid choosing by grade name alone. Shaft requirements should connect load, diameter, delivery condition, machining allowance, inspection, and traceability.
Grade Selection
42CrMo4 vs 34CrNiMo6 for Heavy-Duty Shafts
Heavy-duty shaft buyers often compare 42CrMo4 and 34CrNiMo6 when the part must handle load, fatigue, machining, and inspection requirements. The right choice depends on active standard, load case, diameter, heat-treatment route, and document scope.
Quick Answer
What buyers should know first.
42CrMo4 is commonly discussed for broad alloy shaft and hydraulic applications. 34CrNiMo6 is normally reviewed when higher toughness, heavy-duty rotating parts, or more demanding load cases are involved.
Comparison points
Review equivalent standard, QT condition, diameter, mechanical property target, UT requirement, machining allowance, and final application before quotation.
RFQ checklist
Send grade or equivalent standard, shaft application, diameter, length, quantity, delivery condition, machining allowance, UT requirement, certificate type, and destination port.
Common Mistakes
Avoid avoidable RFQ delays.
- Choosing a grade without stating delivery condition.
- Asking for QT without target property or standard.
- Omitting UT or traceability requirements until after quotation.
Related Pages
Continue through the relevant buyer path.
Open this page to connect the topic with product, processing, document, or RFQ details.
Open this page to connect the topic with product, processing, document, or RFQ details.
Open this page to connect the topic with product, processing, document, or RFQ details.
Open this page to connect the topic with product, processing, document, or RFQ details.
FAQ
Common buyer questions.
Is 34CrNiMo6 always better than 42CrMo4?
No. The better grade depends on the shaft design, load case, standard, heat-treatment target, and inspection scope.
Should shaft RFQs include UT?
For demanding shafts, state whether UT is required before quotation so scope and availability can be reviewed.
Can JOTAIN review both grades?
Yes. Send the active standard, size, application, condition, and document requirements for review.
RFQ
Turn this insight into a clear RFQ.
Include delivery condition, processing requirement, destination port, testing requirements, and certificate expectations so the supply route can be reviewed clearly.