303 Stainless Steel Bar
Best fit for CNC machining, screw-machine work and stronger chip control.
Bar Solutions
China Stainless Steel Bar Supplier and
China Stainless Steel Bar Supplier and
Grade Selection Support
Built for machining buyers, project teams and small-batch sourcing who need a stainless steel bar supplier in China. Review 1,000+ tons of stainless steel bar stock, common shapes including round, hex, square and flat bar, finish options, tolerance support and grade paths for 303, 304, 316 and other requested grades.
Round / Hex / Square / Flat
Common forms
3 - 300 mm
Typical supply range
303 / 304 / 316+
Ready stock grades
MOQ 100kg
Small-order support
Browse by Grade
Start with the right stainless steel bar grade from ready stock
304/304L Stainless Steel Bar
A practical general-purpose option for fabrication, stock supply and custom cutting.
316/316L Stainless Steel Bar
A stronger choice when chloride, marine or chemical exposure matters more.
Duplex Stainless Steel Bar
For 2205, S31803, S32205 and 2507 bar when strength and chloride resistance both matter.
Browse by Shape
Choose the bar profile closest to the finished part
Stainless Steel Round Bar
For shafts, pins, turned parts and general CNC-machined components.
Stainless Steel Hex Bar
For fasteners, valve parts, couplings and CNC parts that need across-flats control.
Stainless Steel Square Bar
For brackets, support parts and machined blanks that keep flat-sided profiles.
Stainless Steel Flat Bar
For brackets, frames, supports and rectangular blanks that use thickness x width sizing.
Round Bar by Grade
Choose the round bar grade closest to the job
Browse by Finish
Choose the finish route that matches machining and surface needs
Cold Drawn Stainless Steel Bar
A practical route for brighter surface, steadier dimensions and routine machining work.
Peeled Stainless Steel Bar
A cleaner machining stock path when the job needs surface cleanup before final turning.
Centerless Ground Stainless Steel Bar
For h9 tolerance review, smoother surface and precision CNC shaft work.
Polished Stainless Steel Bar
For cleaner visible surfaces, smoother handling and appearance-focused requirements.
Specification Reference
General bar supply reference
| Category | Round Bar | Hex Bar | Square Bar | Flat Bar | Notes |
|---|---|---|---|---|---|
| Size Range | 3 - 300 mm | S5 - S75 mm | 4 - 100 mm | Thickness x width review | Routine stock and project-based sizes can be reviewed by grade and finish |
| Grades | 303 / 304 / 304L / 316 / 316L / 2205 / 2507+ | 303 / 304 / 316+ | 304 / 316L+ | 304 / 316L+ | Grade path depends on machining, corrosion risk, stock condition and delivery target |
| Surface | Cold Drawn / Polished / Centerless Ground | Cold Drawn / Bright | Cold Drawn / Bright | Hot Rolled / Bright / Polished | Finish choice changes machining feel, appearance and tolerance range |
| Service | Cut-to-length | Small batch review | Export packing | Cut-to-length | Documents, labeling and batch release can be coordinated before shipment |
Useful Tool
Open Bar Weight Calculator
Need a quick bar reference before inquiry?
Use the main bar calculator, dedicated round and hex bar calculators, or the tolerance lookup before inquiry.
Common Buying Paths
Match the bar path to the finished part
Shafts and Turned Parts
Round bar is the routine starting stock for shafts, pins and CNC-turned components.
MachiningShaftsGeneral use
Fasteners and Couplings
Hex bar helps when the part keeps wrench flats, AF size or coupling geometry.
FastenersValve partsAcross flats
Brackets and Machined Blanks
Square bar suits flat-sided blanks, brackets and profile-controlled components.
Profile partsStructural blanksCut pieces
Frames and Supports
Flat bar suits brackets, supports, frames and rectangular fabricated blanks.
SupportsFramesCut pieces
Surface Finish
Common finish options for machining and project supply
Cold Drawn
Good dimensional consistency for routine machining work.
Polished
Cleaner surface for visible parts and smoother handling.
Centerless Ground
For tighter diameter control and more demanding shaft applications.
Black Surface
A practical option for rougher project use and follow-up processing.
Service Support
Ready stock, cutting and small-order support
Share the target grade, size, finish and application first. We can then confirm what is ready stock, what needs project review and what is better matched to another grade.
Tolerance support
h8, h9 and h11 can be reviewed by shape, size and finish.
Custom cutting
Cut-to-length support helps buyers avoid ordering full bar lengths when the job needs shorter pieces.
Small-batch review
MOQ from 100kg, trial orders and replenishment orders can be discussed around actual stock and processing conditions.
Standards
Common stainless steel bar standard wording
Common bar standard wording may include ASTM A276, ASTM A479 / ASME SA479, JIS G4303 and GB/T 1220 depending on drawing and buyer requirement.
| Standard Wording | Typical Buyer Context | Buyer Note |
|---|---|---|
| ASTM A276 | General stainless steel bars and shapes | Common for 304, 316 and other bar inquiries |
| ASTM A479 / ASME SA479 | Boiler, pressure vessel, valve or pressure-related review | Often reviewed for 316/316L round bar when specified |
| JIS G4303 | SUS303, SUS304 and SUS316 naming context | Useful for Japan-related and Southeast Asia buyers |
| GB/T 1220 | China stainless steel bar standard wording | Confirm exact Chinese grade and MTC wording |
Final standard wording should follow drawing, purchase order and MTC.
Bar Insights
Read the core buying guides behind this bar range
Stainless Steel Bar Price Guide 2026 for Southeast Asia Buyers
See how grade, finish, tolerance and destination change the real quote logic for bar orders.
Import Stainless Steel Bars into Vietnam: 2026 Buyer Guide
Review ASTM standards, Form E, MTC and port-planning points before a Vietnam bar shipment.
316 vs 316L Stainless Steel Bar for Oil & Gas
Compare welding risk, sensitization and offshore-use logic for higher-spec 316 and 316L bar review.
Centerless Ground Stainless Steel Bar
Review h9 tolerance, smoother surface and precision shaft supply for CNC buyers.
h8 / h9 / h10 / h11 Tolerance Lookup
Check a quick nominal-size tolerance range before sending a machining-bar inquiry.
Round Bar Weight Calculator
Estimate round bar weight from grade, diameter, length and quantity.
Hex Bar Weight Calculator
Estimate hex bar weight from across-flats size, grade and length.
Stainless Steel Grade Equivalent Lookup
Compare ASTM / AISI, UNS, EN and JIS grade naming before document review.
Peeled Stainless Steel Bar
Compare peeled bar as a cleaner machining stock path before final turning.
Stainless Steel Hex Bar
Use hex bar when the part needs across-flats control and less extra milling.
Stainless Steel Round Bar
Review 303, 304, SUS304, ASTM A276 304 and 316 round bar for shafts and CNC turned parts.
303 Stainless Steel Round Bar
Use 303 round bar when CNC machinability and chip control drive the job.
304/304L Stainless Steel Round Bar
Use 304/304L round bar for general shafts, pins and stock supply.
316L Stainless Steel Round Bar
Use 316L round bar when marine or chloride exposure matters more.
Stainless Steel Square Bar
Review 304, SUS304, ASTM 304 and 316 square bar for brackets, supports and machined blanks.
Stainless Steel Flat Bar
Review 304 and 316 flat bar for brackets, supports, frames and cut-to-length rectangular blanks.
Duplex Stainless Steel Bar
Review 2205, S31803, S32205 and 2507 duplex bar for marine, chemical and high-strength corrosion-resistant parts.
Buyer FAQ
Quick answers before you send a bar inquiry
Which stainless steel bar grade is best for CNC machining?
303 is usually the first grade to review for CNC machining because it is easier to cut and helps chip control.
When should I choose 316 bar instead of 304 bar?
Choose 316 when the part will see more chloride, marine air or chemical exposure.
Can I ask for short cut lengths instead of full bars?
Yes. Cut-to-length support can be reviewed based on size, finish and order quantity.
Do you support hex and square stainless steel bars?
Yes. Round, hex, square and flat bars can all be reviewed, but routine ranges depend on grade, size, finish and current stock.
Share the bar grade, size and job condition.
Send the grade, shape, diameter, length, finish, quantity and application. We will reply with a stock path and supply suggestion that fits the job.
Contact Sales Team