RFQ checklist
- Grade or acceptable equivalent
- Diameter, finished diameter, and length
- Chrome plating and surface requirement
- Quantity, certificate need, and destination
Technical Resource
42CrMo4 vs CK45 for Hydraulic Cylinder Rods
Hydraulic cylinder rod buyers often compare 42CrMo4 / 4140 and CK45 / 1045 because both can appear in rod, shaft, and machined-part discussions. The right choice depends on load, delivery condition, machining route, surface requirement, and inspection plan.
Quick Answer
What buyers should know first.
CK45 is commonly reviewed for standard hydraulic rod or machined routes, while 42CrMo4 is reviewed when higher strength, toughness, QT condition, or demanding hydraulic service is involved.
RFQ Comparison
Connect the topic to quotation impact.
| Topic | What to review | RFQ impact |
|---|---|---|
| Grade route | CK45 / 1045 versus 42CrMo4 / 4140 against load and application | Avoids quoting a carbon steel route when alloy steel is required |
| Surface route | Peeling, straightening, grinding, polishing, and chrome plating | Connects base steel with final rod requirement |
| Documents | MTC, dimensional checks, surface checks, and traceability | Clarifies inspection scope before quotation |
Application Examples
Where this guide is commonly useful.
Confirm details during RFQ review.
Confirm details during RFQ review.
Confirm details during RFQ review.
Common Mistakes
Reduce back-and-forth before quotation.
Buyer Guide
What to review before quotation.
Use this guide to prepare a clearer specification and reduce back-and-forth during RFQ review.
When 42CrMo4 is normally discussed
42CrMo4 / 4140 is usually considered when the part needs higher strength, quenched-and-tempered supply, and stronger support for high-load hydraulic or rotating components.
When CK45 is normally discussed
CK45 / 1045 is commonly discussed for medium-carbon shaft and rod applications where general machining, dimensional control, and practical cost balance matter.
What buyers should confirm
Confirm equivalent standard, delivery condition, diameter, length, straightness, machining allowance, surface route, MTC requirement, and whether mechanical testing or UT is needed.
Related Pages
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Open this page to connect the guide topic with product, processing, document, or RFQ details.
FAQ
Common buyer questions.
Is 42CrMo4 equivalent to AISI 4140?
42CrMo4 and AISI 4140 are commonly discussed as comparable Cr-Mo alloy steels, but the active order standard and property requirements should be confirmed before quotation.
Can CK45 be used for hydraulic rods?
CK45 can be discussed for some rod applications, but load, surface route, straightness, machining, and testing requirements must be reviewed.
What should I include in an RFQ?
Include grade or equivalent standard, diameter, length, quantity, delivery condition, application, destination, and certificate or testing requirements.
RFQ
Turn this guide into a clear RFQ.
Include delivery condition, processing requirement, destination port, testing requirements, and certificate expectations so the supply route can be reviewed clearly.