At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM B99/B99M. Standard specification for copper-silicon alloy (silicon bronze) wire for general applications. B99 wire is the cold-drawn feedstock for silicon-bronze fasteners, cold-headed screws, rivets, cotter pins and spring hardware requiring corrosion resistance.
Standard specification for copper-silicon alloy (silicon bronze) wire for general applications. B99 wire is the cold-drawn feedstock for silicon-bronze fasteners, cold-headed screws, rivets, cotter pins and spring hardware requiring corrosion resistance.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Low-silicon bronze B | UNS C65100 | Cu-Si ~1.5% Si wire |
| High-silicon bronze A | UNS C65500 | Cu-Si ~3% Si wire |
Minimum mechanical requirements per ASTM B99/B99M.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| C65100 wire (O61 soft) | 40 ksi (275 MPa) | N/A | 20 | N/A |
| C65100 wire (H04 hard) | 75 ksi (515 MPa) | N/A | 5 | N/A |
| C65500 wire (O61 soft) | 56 ksi (385 MPa) | N/A | 20 | N/A |
| C65500 wire (H08 spring) | 105 ksi (725 MPa) | N/A | 3 | N/A |
| Grade | Key Composition, % |
|---|---|
| C65100 | Cu rem, Si 0.8-2.0, Mn <=0.7, Fe <=0.8, Zn <=1.5 |
| C65500 | Cu rem, Si 2.8-3.8, Mn 0.50-1.3, Fe <=0.8, Zn <=1.5, Ni <=0.6 |
ASME SB-99; UNS C65100/C65500; silicon bronze wire; companion B96 (plate), B98 (rod)
For the official ASTM International standards catalogue, see the ASTM International standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply ASTM B99/B99M fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
Standard specification for copper-silicon alloy (silicon bronze) wire for general applications. B99 wire is the cold-drawn feedstock for silicon-bronze fasteners, cold-headed screws, rivets, cotter pins and spring hardware requiring corrosion resistance.
Ananka Fasteners supplies Low-silicon bronze B, High-silicon bronze A to ASTM B99/B99M. See the Grades / Classes Covered table above for full details of each grade.
Minimum tensile strength, yield strength, elongation and hardness requirements vary by grade — see the Mechanical Properties table above for the complete breakdown.
We supply ASTM B99/B99M fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
Yes. For a quotation, provide the required fastener type, grade, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need a fastener released to ASTM B99/B99M for an industrial project? Send the required fastener type, grade, size, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ASTM B99/B99M requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM B99/B99M and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
