At Ananka Fasteners Pvt Ltd, we manufacture fasteners to the dimensional requirements of ASME B18.2.6M. ASME B18.2.6M is a structural-application specification that consolidates the dimensional and general requirements for metric fasteners used in steel-to-steel structural connections, principally metric heavy hex structural bolts together with their mating heavy hex nuts and hardened washers. It incorporates the former B18.2.3.7M (heavy hex structural bolts) and references B18.2.4.6M (heavy hex nuts), and adds a screw straightness gage and gaging procedure. It is a specification-level standard rather than a single geometry table; the representative table below gives the heavy hex structural bolt head dimensions it governs (M16-M36).
ASME B18.2.6M is a structural-application specification that consolidates the dimensional and general requirements for metric fasteners used in steel-to-steel structural connections, principally metric heavy hex structural bolts together with their mating heavy hex nuts and hardened washers. It incorporates the former B18.2.3.7M (heavy hex structural bolts) and references B18.2.4.6M (heavy hex nuts), and adds a screw straightness gage and gaging procedure. It is a specification-level standard rather than a single geometry table; the representative table below gives the heavy hex structural bolt head dimensions it governs (M16-M36).
A family of structural-connection fasteners: metric heavy hex structural bolts (short thread, large head), heavy hex nuts, and hardened structural washers, applied together in bolted steel structures.
Key dimensions for common sizes are listed below.
| Nominal Size | Width Across Flats (mm) | Width Across Corners (mm) | Head Height (mm) |
|---|---|---|---|
| M16 | 27 | 31.18 | 10.75 |
| M20 | 34 | 39.26 | 13.40 |
| M22 | 36 | 41.57 | 14.90 |
| M24 | 41 | 47.34 | 15.90 |
| M27 | 46 | 53.12 | 17.90 |
| M30 | 50 | 57.74 | 19.75 |
| M36 | 60 | 69.28 | 23.55 |
Metric coarse threads per ASME B1.13M, external class 6g (bolts) / internal class 6H (nuts).
Consolidates ASME B18.2.3.7M and works with B18.2.4.6M heavy hex nuts and F436M washers; the metric analog of inch ASME B18.2.6, applied with ASTM A325M/A490M (F3125M) grades.
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 B18.2.6M 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.
ASME B18.2.6M is a structural-application specification that consolidates the dimensional and general requirements for metric fasteners used in steel-to-steel structural connections, principally metric heavy hex structural bolts together with their mating heavy hex nuts and hardened washers. It incorporates the former B18.2.3.7M (heavy hex structural bolts) and references B18.2.4.6M (heavy hex nuts), and adds a screw straightness gage and gaging procedure. It is a specification-level standard rather than a single geometry table; the representative table below gives the heavy hex structural bolt head dimensions it governs (M16-M36).
Ananka Fasteners manufactures ASME B18.2.6M in sizes from M16–M36. See the Dimensional Table above for the complete size breakdown.
Metric coarse threads per ASME B1.13M, external class 6g (bolts) / internal class 6H (nuts).
We produce ASME B18.2.6M 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 B18.2.6M 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 B18.2.6M requirement, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Dimensions compiled per ASME B18.2.6M and industry references; provided for reference only — confirm against the current edition of the standard before design use.
