State one side dimension
Square bar is ordered by side size, such as 20 x 20 mm. Do not send a round-bar diameter or a hex-bar across-flats dimension.
Stainless Steel Square Bar Supplier
Square Bar Specified by
Square Bar Specified by
Side Size and Finished Geometry
FX Stainless Steel supplies stainless steel square bar from China for machined blocks, fixtures, brackets and flat-sided components. Send the grade, side size, tolerance, corner requirement, straightness, cut length, quantity and destination so we can confirm a suitable supply and packing route for Southeast Asia, the Middle East or other export markets.
Side Size
Primary dimension
304 / 316
Common grade families
Twist + Straightness
Geometry checks
MTC + Labels
Batch traceability
Quick Answer
What should buyers confirm before ordering stainless steel square bar?
Define the geometry that matters
Corner shape, twist, straightness and side tolerance affect fixturing and machining even when the nominal side size is correct.
Match cutting to the next process
Full lengths suit general fabrication. Fixed cut pieces can reduce handling when the buyer already has a machining or drilling plan.
Square Geometry
Equal sides do not guarantee a machining-ready blank
Two bars can carry the same nominal side size and still behave differently in a fixture. A buyer making blocks, brackets or repeated CNC parts should state how much variation is acceptable across the sides, whether corner radius matters, and how twist or bow will be checked over the ordered length.
Side tolerance
Controls how consistently the bar enters a fixture and how much stock remains for milling.
Corner condition
Sharp, slightly rounded or mill-finished corners change the usable profile near each edge.
Twist and straightness
Long pieces need a clear inspection method when rotation or bow would disrupt cutting and assembly.
Specification Reference
Square bar details to place on the RFQ and purchase order
| Purchase Item | What to State | Why It Matters |
|---|---|---|
| Grade and standard | 304, 304L, 316, 316L or drawing wording; ASTM A276, ASTM A479, JIS G4303 or another required standard | The quotation, PO, MTC and labels should use compatible grade and standard wording |
| Side size | Nominal side x side in mm or inch | Separates square bar from diameter, across-flats and flat-bar thickness x width language |
| Dimensional tolerance | Side-size tolerance and inspection point | Affects fixture fit, machining allowance and acceptance at receiving |
| Corner condition | Mill corner, rounded corner or drawing radius where critical | Determines how much of the nominal square remains usable near the edges |
| Length geometry | Straightness, twist and full-length or fixed-length requirement | Reduces disputes when long bars must feed, clamp or align before cutting |
| Documents and packing | MTC, heat number, bundle labels, piece separation and destination marks | Keeps different sizes and heats identifiable after sea freight |
Useful Tool
Open Bar Weight Calculator
Estimate square bar theoretical weight
Use side size, grade, length and quantity to estimate theoretical order weight before requesting a quote.
Buyer Applications
Where square-section stock saves machining or fabrication work
Machined blocks and fixtures
Square stock starts closer to a block-shaped component and can reduce profile milling compared with round bar when the drawing retains flat faces.
CNC blocksFixtures
Brackets and mounting parts
Fixed cut pieces can support drilling, tapping and welding routes when side size and corner condition are agreed first.
BracketsMounting parts
Frames and flat-sided components
Square bar fits parts that need four equal faces rather than the wider rectangular section supplied as flat bar.
Equal sidesFrame parts
Repeated cut blanks
A labeled cutting plan helps workshops separate sizes and heats when several blank lengths share one shipment.
Cut blanksBatch labels
Supply Route
Surface route changes tolerance, corner and machining allowance
The route should match the drawing and next operation. A bright surface does not by itself prove a tight side tolerance or low twist.
| Supply Route | Typical Character | Buyer Check | Suitable Inquiry |
|---|---|---|---|
| Hot-rolled or mill-finished square bar | Mill surface and less refined corners | Side allowance, scale condition, straightness and machining stock | Fabrication or parts that will be machined on several faces |
| Cold-drawn or bright square bar | Cleaner surface and more controlled section | Actual side tolerance, corner profile, twist and residual machining allowance | Fixtures, repeated blanks and closer-to-finished profiles |
| Polished square bar | Additional surface treatment for visible or handling requirements | Polish direction, scratches, corner change and protective packing | Visible parts where appearance is stated on the PO |
| Cut square blanks | Full bar divided into fixed pieces | Cut tolerance, end squareness, burrs, labels and piece count | CNC loading, drilling or assembly-ready batches |
Pre-Shipment Check
Inspect the section before the bundles are closed
For export orders, we keep the agreed side size, heat number and bundle marks visible in the document and packing workflow. Buyers with tight fixture or machining requirements should add their measurement method to the PO rather than relying on a nominal size alone.
Measure more than one face
Check side dimensions at agreed points and record any corner-related measurement rule.
Look along the full length
Twist, bow and handling damage may not appear in a single end-face photo.
Match paper to bundles
MTC heat number, bundle label, size mark and packing list should identify the same material batch.
Related Pages
Continue the square bar buying path
Stainless Steel Bar
Browse grade, shape, processing and document routes across the stainless steel bar range.
Stainless Steel Flat Bar
Use flat bar when the drawing calls for a wider rectangular section ordered by thickness x width.
Stainless Steel Round Bar
Use round bar for shafts, pins and parts that begin with a turned diameter.
Stainless Steel Hex Bar
Use hex bar when across-flats size and wrench-flat geometry are part of the finished component.
304 and 304L Stainless Steel Bar
Check grade wording, bar shapes and MTC requirements for general 304 and low-carbon 304L supply.
Round Bar vs Hex Bar vs Square Bar
Compare starting shapes against final geometry, machining waste and clamping needs.
MTC Checklist Before Shipment
Match grade wording, chemistry, heat number, labels and packing list before release.
FAQ
Stainless steel square bar FAQ
How is stainless steel square bar size specified?
Specify one equal side dimension, for example 20 x 20 mm, plus the side tolerance. Add corner, twist and straightness requirements when they affect the finished part.
Can stainless steel square bar be cut to fixed lengths?
Yes. Send the required cut length, length tolerance, end condition, piece count and packing method so the cutting route can be confirmed before quotation.
What is the difference between square bar and flat bar?
Square bar has equal side dimensions. Flat bar has a rectangular section ordered by thickness x width, with the width normally greater than the thickness.
Does bright square bar automatically have tight tolerance?
No. Bright or polished describes a surface route. The PO should separately state side tolerance, corner condition, twist and straightness acceptance.
What documents should accompany an export square bar order?
Buyers commonly request an MTC, heat-number-linked bundle labels and a packing list. Additional inspection records depend on the grade, standard and project requirement.
Send the side size and geometry requirements for your square bar order.
Share grade, standard, side size, tolerance, corner condition, straightness, cut length, quantity, MTC needs and destination. We will confirm the practical supply, cutting and export packing route.
Send Square Bar Inquiry