Home / Value Added Services / Specialty OD Grinding
PRECISION GROUND RODS · SPECIALTY GRINDING
52100 Bearing Steel Tube & Hollow Bar Grinding
High-carbon chromium bearing-steel OD grinding inquiries for tubular blanks, heavy-wall bearing sleeves and precision cylindrical parts.
PROCESS & MATERIAL SELECTION
What this grinding request involves
52100 bearing steel is selected for hard-wearing bearing components and precision parts, but tubular product is not equivalent to standard solid bearing-bar stock. A buyer should specify the available certified tubular product, starting wall and geometry, whether heat treatment has already been completed, and the required finished OD. Depending on hardness and geometry, a different grinding setup may be needed.
Applications and available processing routes are reviewed against your drawing. A page discussing a material or service does not promise stock availability, a universal tolerance, or acceptance of every tube geometry.
SUPPLY & PROCESSING
Before quoting
Identify the tube or bar construction, exact grade and starting condition. Specify the outside diameter before and after grinding, length, quantity, required surface finish, and straightness or concentricity requirements.
TOP GRADES & STANDARDS
Material grades, product specifications & heat treatment
Examples for purchasing discussion—not blanket claims of availability or certification. Verify the correct ASTM edition, form, ordered condition and mill test report.
| Grade / product | Relevant specification | Supplied / heat-treated condition | Grinding review |
|---|---|---|---|
| 52100 / SAE 52100 alloy | ASTM A519 if actually certified as seamless mechanical tubing | Annealed or spheroidized as supplied | Starting geometry and source availability |
| 52100 hardened blank | Grade/product form per certified order | Through-hardened and tempered as ordered | Hardness, finish and burn-control requirements |
| 4140 / 4142 alternative alloy tubes | ASTM A519 as applicable | Annealed or Q&T as specified | Not interchangeable with 52100 without approval |
| 440C stainless bearing-grade hollow material | Correct product form/grade standard | Annealed or hardened/tempered as certified | Different corrosion and hardening behavior |
Material heat treatment, mechanical testing and pressure/structural suitability are governed by the original applicable standard and purchase requirements.
SUPPLIED CONDITION
Heat-treatment conditions to verify
52100 may be provided in a spheroidize-annealed condition before forming/machining, or hardened and tempered after component preparation. These are not interchangeable service states. Thermal processing can introduce bow and wall variation, so finished OD should be reviewed in conjunction with actual hardness and roundness measurement.
If the drawing calls for hardness, tensile properties or treatment after grinding, include it explicitly in the RFQ. Finishing does not itself establish a new certified heat-treated condition.
COMMON RFQ FIELDS
Quote-ready information
- Certificate proving 52100 chemistry and tubular product form
- Tube OD and wall before/after grinding
- Annealed versus hardened and tempered condition
- Surface integrity, finish, eccentricity and inspection plan
ENGINEERING & PURCHASING QUESTIONS
Questions buyers ask
Do you stock ASTM A519 52100 bearing tube?
This page describes quotation requests and does not claim routine stock. Provide the exact standard and product form so sourcing and grinding feasibility can be checked.
Can hardened 52100 tubular blanks be ground?
Feasibility depends on hardness, wall thickness, setup and surface-integrity criteria; these must be reviewed case by case.
Can I substitute 4140 for 52100?
Not without engineering approval. They differ in chemistry, hardening behavior and potential bearing performance.
QUOTE BY GRADE, SIZE & FINISH
Have a tube or oversized bar that needs OD grinding?
Send the material grade and product standard, incoming and finished dimensions, condition, wall or bore details where applicable, length, quantity and any surface, inspection or documentation requirements.