At Ananka Fasteners Pvt Ltd, we manufacture fasteners to the dimensional requirements of ISO 8677. Mushroom (cup) head square neck bolts – the ISO carriage bolt, equivalent to DIN 603 / ISO 8678. A domed round head with a square neck under the head that grips the workpiece to prevent rotation. Product grade C, sizes M5 to M20.
Mushroom (cup) head square neck bolts – the ISO carriage bolt, equivalent to DIN 603 / ISO 8678. A domed round head with a square neck under the head that grips the workpiece to prevent rotation. Product grade C, sizes M5 to M20.
Mushroom head square neck (carriage) bolt
Key dimensions for common sizes are listed below.
| Thread d | Head dia dk max (mm) | Head height k (mm) | Square width s (mm) | Square depth v (mm) |
|---|---|---|---|---|
| M5 | 13.5 | 3.3 | 5.48 | 2.8 |
| M6 | 16.55 | 3.9 | 6.48 | 3.5 |
| M8 | 20.65 | 4.9 | 8.63 | 4.0 |
| M10 | 24.65 | 5.4 | 10.63 | 5.0 |
| M12 | 30.65 | 7.0 | 12.63 | 6.0 |
| M16 | 38.8 | 9.0 | 16.63 | 7.0 |
| M20 | 46.8 | 11.05 | 20.52 | 8.0 |
Metric coarse thread, tolerance class 8g (product grade C)
[‘DIN 603’, ‘ISO 8678’, ‘ISO 8676’, ‘ASME B18.5’]
For the official ISO standards catalogue, see the ISO standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We produce ISO 8677 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.
Mushroom (cup) head square neck bolts – the ISO carriage bolt, equivalent to DIN 603 / ISO 8678. A domed round head with a square neck under the head that grips the workpiece to prevent rotation. Product grade C, sizes M5 to M20.
Ananka Fasteners manufactures ISO 8677 in sizes from M5–M20. See the Dimensional Table above for the complete size breakdown.
Metric coarse thread, tolerance class 8g (product grade C)
We produce ISO 8677 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 ISO 8677 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: ISO 8677 requirement, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Dimensions compiled per ISO 8677 and industry references; provided for reference only — confirm against the current edition of the standard before design use.
