Start with the finished diameter
State the nominal diameter, dimensional tolerance and machining allowance. A diameter alone does not tell the supplier whether hot-rolled, peeled, cold-drawn or ground bar is needed.
Stainless Steel Round Bar Supplier
Round Bar Specified by
Round Bar Specified by
Diameter, Tolerance and Surface Route
FX Stainless Steel supplies round bar from China for shafts, pins, bushings, fasteners and CNC-turned parts. Our overall stainless steel bar inventory exceeds 1,000 tons, with trial orders from 100kg available for selected stock sizes. Send the grade, diameter, tolerance, surface route, cut length, quantity and destination so we can confirm the available material and export packing plan.
1,000+ Tons
Overall bar inventory
3 - 300 mm
Diameter range by inquiry
Hot / Drawn / Ground
Surface routes
MOQ 100kg
Selected stock sizes
Quick Answer
What should buyers specify for stainless steel round bar?
Connect the surface route to the next process
Hot-rolled or peeled bar suits parts with turning allowance. Cold-drawn and centerless-ground routes serve different feeding, finish and tolerance requirements.
Define length, traceability and packing
Add full or fixed length, cut tolerance, MTC, heat-number labels and destination marks so the bars arrive ready for receiving and production planning.
Diameter Control
Nominal diameter is not the same as machining-ready stock
Two stainless steel round bars can share the same nominal diameter but require different machining time. Surface scale, damaged outer layers, straightness, roundness and actual tolerance affect how much material must be removed and whether the bar feeds smoothly into a lathe. Put the acceptance method on the RFQ or drawing when these points influence production.
Tolerance
State a numeric limit, an ISO tolerance class such as h9 or h10, or the exact drawing requirement.
Straightness
Long bars need an agreed measurement length and method when bow would interrupt bar feeding or shaft machining.
Roundness
A tight diameter reading at one point does not automatically confirm roundness along the full ordered length.
Specification Reference
Round bar details to place on the RFQ and purchase order
| Purchase Item | What to State | Effect on Supply |
|---|---|---|
| Grade and standard | 303, 304, 304L, 316, 316L or drawing wording; ASTM A276, ASTM A479, ASME SA479, JIS G4303 or another required standard | Keeps quotation, PO, MTC and bundle labels aligned without turning this shape page into a grade substitution claim |
| Diameter | Nominal diameter in mm or inch and the actual acceptance tolerance | Determines stock route, machining allowance and whether the bar fits a feeder, chuck or finished part plan |
| Straightness and roundness | Drawing limit, measurement length and inspection method where critical | Prevents a nominally correct bar from causing feeding, runout or shaft-machining problems |
| Surface route | Hot rolled, peeled or turned, cold drawn, polished, centerless ground, or supplier proposal | Changes scale condition, dimensional control, surface appearance and remaining machining stock |
| Length and ends | Full length or fixed pieces, length tolerance, saw-cut or other agreed end condition, burr requirement and piece count | Sets the cutting method, usable length, handling route and packing layout |
| Documents and packing | MTC, heat number, bundle labels, packing-list line, moisture protection and destination marks | Maintains batch identity when several grades, diameters or cut lengths share one shipment |
Useful Tool
Open Round Bar Calculator
Estimate round bar theoretical weight
Enter grade, diameter, length and quantity to estimate theoretical order weight before requesting a quotation.
Machining Uses
Applications that naturally begin with a round section
Shafts and rotating parts
Round stock follows the geometry of shafts, rollers and rotating components, but straightness, runout allowance and final diameter still belong on the drawing.
ShaftsRollers
Pins, bushings and sleeves
Fixed cut blanks can reduce saw work when outside diameter, bore machining and end allowance are agreed before cutting.
PinsBushings
CNC and automatic-lathe parts
Feeding stability depends on diameter tolerance, straightness, surface and cut length, not simply on whether the bar looks bright.
CNC turningBar feeding
Fasteners and threaded components
The starting diameter, grade, surface route and machining allowance should match the thread and head-forming process used by the buyer.
FastenersThreaded parts
Supply Route
Choose the round bar route before comparing unit price
The lowest material price is not always the lowest machining cost. Compare quotations only after the surface route, tolerance, straightness and cut service describe the same deliverable.
| Round Bar Route | What Arrives | Buyer Check | Common Next Operation |
|---|---|---|---|
| Hot-rolled or forged bar | Mill surface with machining allowance; often used where more stock will be removed | Surface condition, diameter allowance, straightness and any required machining of the outer layer | Heavy turning, large blanks and general machined parts |
| Peeled or turned bar | Outer mill surface removed by a turning process | Finished diameter range, remaining defects, straightness and machining allowance | Shaft blanks and parts needing a cleaner starting surface |
| Cold-drawn bright bar | Cleaner surface and more controlled diameter than a basic hot-rolled route | Actual tolerance class, straightness, residual stress considerations and cut plan | CNC feeding, pins, fasteners and repeated turned parts |
| Centerless-ground bar | Ground outside diameter for tighter size control and smoother surface | Numeric tolerance, roundness, straightness, surface requirement and protective packing | Precision shafts, close-fit pins and reduced stock-removal work |
| Polished round bar | Additional surface treatment applied to an underlying bar route | Polish finish, scratches, diameter change and whether appearance or machining is the priority | Visible components and handling-sensitive applications |
Cut Length and Packing
A cutting plan should survive both machining and sea freight
We prepare full bars or fixed cut pieces according to the agreed size and quantity. For buyers in Southeast Asia, the Middle East and other export markets, the packing plan should keep each diameter, heat and cut length identifiable after handling at the destination warehouse.
Cut tolerance
State whether the saw cut is a rough blank allowance or a receiving dimension that will be inspected.
End and burr condition
Photos and PO wording should show whether ordinary saw-cut ends are acceptable or further finishing is required.
Bundle separation
Different diameters, grades and heats need clear tags and packing-list references rather than one generic bundle mark.
Transport protection
Bundle restraint, supports, moisture protection and destination marks depend on bar length, diameter and shipping method.
MTC and Heat Number
Connect the certificate to the bars before shipment release
The MTC should carry the agreed grade and standard wording, chemical results and heat number. The same heat number must connect to the physical bundle label and packing list. The image shown here is an example certificate from one 304 batch; it demonstrates the checking method and does not represent every grade or warehouse heat.
Grade and standard wording
Match the PO language rather than accepting a vague equivalent description after production.
Heat-number link
The MTC, bundle tag and packing-list line must point to the same material batch.
Product description
Diameter, bar form and condition should be consistent with the documents available for the supplied batch.
Release record
Keep label photos and document copies with the inspection file before payment or shipment release.
Related Pages
Continue the round bar buying path
Stainless Steel Bar
Browse bar shapes, grades, processing routes, MTC requirements and export support.
303 Stainless Steel Round Bar
Start here when chip control and repeated CNC turning drive the grade choice.
304 Stainless Steel Round Bar
Check ASTM A276 304, SUS304, diameter, finish, cutting and MTC details for general industrial parts.
316L Stainless Steel Round Bar
Use the grade-specific page when chloride exposure, molybdenum content or low-carbon wording matters.
Centerless Ground Stainless Steel Bar
Compare ground bar when tighter diameter, roundness and surface requirements reduce later stock removal.
Round Bar vs Hex Bar vs Square Bar
Match the starting shape to the finished geometry, clamping method and machining waste.
MTC Checklist Before Shipment
Check grade wording, chemistry, heat number, labels and packing list before releasing the cargo.
FAQ
Stainless steel round bar FAQ
How should stainless steel round bar size be specified?
State the nominal diameter, unit and tolerance, followed by straightness or roundness requirements where they affect feeding or machining. Add the surface route and full or cut length.
Which round bar surface route is suitable for CNC machining?
It depends on the finished diameter and machining allowance. Hot-rolled or peeled bar suits jobs that remove more stock, while cold-drawn or centerless-ground bar may reduce preparation where tighter size and surface control are required.
Does 1,000+ tons of bar stock mean every round bar size is available?
No. The figure refers to our overall stainless steel bar inventory. Availability for a specific round bar still depends on grade, diameter, surface route, tolerance, length and the warehouse batch at quotation.
Can I order stainless steel round bar from 100kg?
Yes, MOQ from 100kg is available for selected stock sizes. Send the grade, diameter, finish and cut requirement so we can confirm whether the requested batch supports a small order.
Can stainless steel round bar be cut to fixed lengths?
Yes. State the piece length, cut tolerance, end or burr requirement, quantity and labeling method. The practical cutting and packing route depends on diameter and total quantity.
What should match between the MTC and round bar shipment?
The grade and standard wording, heat number and available product details should match the purchase order, physical bundle labels and packing list. Keep label photos before shipment release.
Send the diameter, tolerance and surface route for your round bar order.
Share grade, standard, diameter, tolerance, straightness, full or cut length, quantity, application, MTC needs and destination. We will check stock availability, cutting options, batch documents and export packing.
Send Round Bar Inquiry