Specification summary of BS 7805 as applied to large-diameter lockbolt assemblies (bs 7805-2): the dimensions the standard fixes, the full size range supplied, and the related designations commonly cross-referenced.
BS 7805 — Scope
The table below lists the dimensions catalogued for large-diameter lockbolt assemblies (bs 7805-2) under BS 7805. The scope of BS 7805 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to BS 7805. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by BS 7805
| Nominal diameter (mm) | Pin head styles | Collar styles | Strength grade | Assembly | Material options | Reference standard |
|---|---|---|---|---|---|---|
| 12.7 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 15.9 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 19.1 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 22.2 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 25.4 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 28.6 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 31.8 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
| 34.9 | round / truss / countersunk / threaded-head | standard / flanged / low-profile | 8.8 | pin + collar | steel / stainless steel / aluminum alloy | BS 7805 Part 2:1997 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Large-Diameter Lockbolt Assemblies (BS 7805-2) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
Companion Standards
A complete specification for large-diameter lockbolt assemblies (bs 7805-2) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. BS 7805 is one of them, not all of them.
Custom manufacturing · Made to drawing
Need a rivet to this standard in a non-standard size?
Parts built to BS 7805 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by cold heading or drawing.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
