This page presents the complete BS 3692 dimensional standard as used by Ananka Fasteners Pvt Ltd across our fastener catalogue. British standard for ISO metric precision hexagon bolts, screws and nuts. Covers close-tolerance products in the metric size range M4 to M68, superseded technically by ISO 4014/4032 but still specified on many process and structural jobs. The dimension table below reflects the values manufactured to at Ananka in every grade we stock.
British standard for ISO metric precision hexagon bolts, screws and nuts. Covers close-tolerance products in the metric size range M4 to M68, superseded technically by ISO 4014/4032 but still specified on many process and structural jobs.
| Standard | BS 3692 | Family | BS |
| Units | Metric | Nominal Size Range | M4 – M68 |
| Thread Standard | ISO 261 metric coarse / fine | Fastener Types Covered at Ananka | Hex Bolt (Precision) |
| Grades Available | 79 (Nickel 200 through Zeron 100 – see Section 4) | Related Standards | ISO 4014 (superseding) |
The BS 3692 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. BS 3692 covers precision hex bolts manufactured to close (Class A) tolerances.
| Nominal Thread (d) | Pitch (mm) | Width Across Flats s (mm) | Width Across Corners e (min, mm) | Head Height k (mm) |
|---|---|---|---|---|
| M6 | 1.0 | 10.00 | 11.05 | 4.0 |
| M8 | 1.25 | 13.00 | 14.38 | 5.3 |
| M10 | 1.5 | 16.00 | 17.77 | 6.4 |
| M12 | 1.75 | 18.00 | 20.03 | 7.5 |
| M16 | 2.0 | 24.00 | 26.75 | 10.0 |
| M20 | 2.5 | 30.00 | 33.53 | 12.5 |
| M24 | 3.0 | 36.00 | 39.98 | 15.0 |
| M30 | 3.5 | 46.00 | 50.85 | 18.7 |
| M36 | 4.0 | 55.00 | 60.79 | 22.5 |
At Ananka, the following fastener geometries are produced to BS 3692:
Every grade in the Ananka catalogue is available in this dimensional standard:
Threads are cut to ISO 261 metric coarse / fine. Standard tolerance class is 6g (external) / 6H (internal) for metric, or Class 2A/3A for inch series. Fine-thread and interference-fit variants are available on request.
Every fastener produced to BS 3692 undergoes 100% dimensional inspection with calibrated gauges. Traceability is maintained from mill certificate to shipment.
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.
This datasheet references BS 3692 for dimensional requirements. The applicable standard edition and purchase requirements should be confirmed for every project.
For BSI standards information, see the BSI standards catalogue. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
British standard for ISO metric precision hexagon bolts, screws and nuts. Covers close-tolerance products in the metric size range M4 to M68, superseded technically by ISO 4014/4032 but still specified on many process and structural jobs.
BS 3692 is manufactured by Ananka in Hex Bolt (Precision), across a M4 – M68 size range.
Ananka Fasteners manufactures Hex Bolt (Precision) to BS 3692. See the Fastener Types table above for the full list.
Threads are cut to ISO 261 metric coarse / fine. See Section 5 above for the tolerance class.
79 (Nickel 200 through Zeron 100 – see Section 4) available in this dimensional standard. See Section 4 above for the full grade list.
Yes. For a quotation, provide the required nominal size, material grade, quantity and any inspection or certificate requirements.
Need a fastener manufactured to BS 3692 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: BS 3692 requirement, fastener type, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
