At Ananka Fasteners Pvt Ltd, we manufacture fasteners to the dimensional requirements of DIN 603. DIN 603 (equivalent to ISO 8677) covers mushroom/cup (round) head square-neck bolts, commonly called carriage bolts. The domed head with an integral square neck pulls into timber or a square hole and resists rotation during tightening. Values below are nominal head and square-neck dimensions (max values shown for dk/k/v).
DIN 603 (equivalent to ISO 8677) covers mushroom/cup (round) head square-neck bolts, commonly called carriage bolts. The domed head with an integral square neck pulls into timber or a square hole and resists rotation during tightening. Values below are nominal head and square-neck dimensions (max values shown for dk/k/v).
Mushroom (cup) head square-neck carriage bolt
Key dimensions for common sizes are listed below.
| Thread d | Head Dia dk max (mm) | Head Height k max (mm) | Square Width v max (mm) |
|---|---|---|---|
| M5 | 13.55 | 3.3 | 5.48 |
| M6 | 16.55 | 3.88 | 6.48 |
| M8 | 20.65 | 4.88 | 8.58 |
| M10 | 24.65 | 5.38 | 10.58 |
| M12 | 30.65 | 6.95 | 12.70 |
| M16 | 38.80 | 8.95 | 16.70 |
ISO metric coarse thread, tolerance 6g per ISO 965
[‘ISO 8677 (equivalent)’, ‘DIN 607 (cup head nib bolts)’, ‘DIN 604 / DIN 608 (countersunk square-neck bolts)’, ‘DIN 605 (countersunk, long square)’]
For the official DIN standards catalogue, see the DIN standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We produce DIN 603 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.
DIN 603 (equivalent to ISO 8677) covers mushroom/cup (round) head square-neck bolts, commonly called carriage bolts. The domed head with an integral square neck pulls into timber or a square hole and resists rotation during tightening. Values below are nominal head and square-neck dimensions (max values shown for dk/k/v).
Ananka Fasteners manufactures DIN 603 in sizes from M5–M16. See the Dimensional Table above for the complete size breakdown.
ISO metric coarse thread, tolerance 6g per ISO 965
We produce DIN 603 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 DIN 603 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: DIN 603 requirement, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Dimensions compiled per DIN 603 and industry references; provided for reference only — confirm against the current edition of the standard before design use.
