At Ananka Fasteners Pvt Ltd, we manufacture fasteners to the dimensional requirements of ASME B18.5.2.1M / .2.2M / .2.3M. Metric round head bolts family: B18.5.2.1M round head SHORT square-neck bolts, B18.5.2.2M round head square-neck bolts, B18.5.2.3M round head ribbed-neck bolts (metric carriage bolts). Table below is the round head square-neck (B18.5.2.2M) geometry, representative of the family.
Metric round head bolts family: B18.5.2.1M round head SHORT square-neck bolts, B18.5.2.2M round head square-neck bolts, B18.5.2.3M round head ribbed-neck bolts (metric carriage bolts). Table below is the round head square-neck (B18.5.2.2M) geometry, representative of the family.
Round head square-neck (carriage) bolt (metric)
Key dimensions for common sizes are listed below.
| Thread size | Head dia dk max (mm) | Head height k max (mm) | Square width v max (mm) |
|---|---|---|---|
| M6 | 10.7 | 3.6 | 6.48 |
| M8 | 12.5 | 4.8 | 8.58 |
| M10 | 15.5 | 5.8 | 10.58 |
| M12 | 19.0 | 6.8 | 12.70 |
| M16 | 25.5 | 8.9 | 16.70 |
| M20 | 31.9 | 10.9 | 20.84 |
6g external (metric coarse per ASME B1.13M)
[‘ASME B18.5’, ‘DIN 603’, ‘ISO 8677’]
For the official ASME standards catalogue, see the ASME standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We produce ASME B18.5.2.1M / .2.2M / .2.3M fasteners in carbon and alloy steel, austenitic, duplex and super-duplex stainless, and high-nickel, titanium and copper alloys — for structural, flanged, machinery and process applications worldwide.
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.
Metric round head bolts family: B18.5.2.1M round head SHORT square-neck bolts, B18.5.2.2M round head square-neck bolts, B18.5.2.3M round head ribbed-neck bolts (metric carriage bolts). Table below is the round head square-neck (B18.5.2.2M) geometry, representative of the family.
Ananka Fasteners manufactures ASME B18.5.2.1M / .2.2M / .2.3M in sizes from M6–M20. See the Dimensional Table above for the complete size breakdown.
6g external (metric coarse per ASME B1.13M)
We produce ASME B18.5.2.1M / .2.2M / .2.3M fasteners in carbon and alloy steel, austenitic, duplex and super-duplex stainless, and high-nickel, titanium and copper alloys — for structural, flanged, machinery and process applications worldwide.
Yes. For a quotation, provide the required nominal size, material grade, quantity and any inspection or certificate requirements.
Need a fastener manufactured to ASME B18.5.2.1M / .2.2M / .2.3M for an industrial project? Send the required fastener type, size, material grade, 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: ASME B18.5.2.1M / .2.2M / .2.3M requirement, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Dimensions compiled per ASME B18.5.2.1M / .2.2M / .2.3M and industry references; provided for reference only — confirm against the current edition of the standard before design use.
