BS 7805 specifies the dimensions and tolerances for huck c6l small-diameter lockbolt assembly. The full dimensional table is reproduced below, followed by the DIN, ISO and ASME parts that match or supersede it.
- Standard
- BS 7805
- Product
- Huck C6L Small-Diameter Lockbolt Assembly
- Governing standards
- BS 7805 Part 1:1997
Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.
BS 7805 is the standard cited for huck c6l small-diameter lockbolt assembly. This page sets out what the standard controls for this part, reproduces the dimensional table supplied against it, and notes the related designations referenced on drawings.
BS 7805 — Scope
BS 7805 specifies the dimensional requirements for huck c6l small-diameter lockbolt assembly. Material, surface condition and any performance rating are set by separate documents specific to this part family — ISO 898-1 and ISO 898-2, which govern bolt and nut property classes, do not apply here.
Tolerance & Product Grades
Tolerances for huck c6l small-diameter lockbolt assembly are given as limits on the individual dimensions in the table rather than as a fastener product grade. Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by BS 7805
| Nominal diameter (mm) | Pin head styles | Collar styles | Strength grade | Assembly | Material options | Reference standard |
|---|
| 4.8 | brazier / truss / countersunk | standard / flanged / wide-flanged / low-profile | 5.8 | pin + collar | carbon steel / stainless steel / aluminum alloy | BS 7805 Part 1:1997 |
| 6.4 | brazier / truss / countersunk | standard / flanged / wide-flanged / low-profile | 5.8 | pin + collar | carbon steel / stainless steel / aluminum alloy | BS 7805 Part 1:1997 |
| 7.9 | brazier / truss / countersunk | standard / flanged / wide-flanged / low-profile | 5.8 | pin + collar | carbon steel / stainless steel / aluminum alloy | BS 7805 Part 1:1997 |
| 9.5 | brazier / truss / countersunk | standard / flanged / wide-flanged / low-profile | 5.8 | pin + collar | carbon steel / stainless steel / aluminum alloy | BS 7805 Part 1:1997 |
Companion Standards
BS 7805 controls only the geometry of huck c6l small-diameter lockbolt assembly. Surface finish is governed by separate finish standards (for example ISO 4042 for electroplating), and corrosion testing by ISO 9227 (neutral salt spray). Mechanical performance is set by the standards specific to this part family, not by ISO 898-1 or ISO 898-2, which apply to bolts, screws and nuts.
When to Specify BS 7805
Choose BS 7805 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for huck c6l small-diameter lockbolt assembly.
Applications & Industries
The sectors that buy Huck C6L Small-Diameter Lockbolt Assembly to BS 7805 Part 1:1997, and the duty each one buys them for. Stocked from 4.8 to 9.5 (nominal diameter).
Industries that specify Huck C6L Small-Diameter Lockbolt Assembly
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Rail interiors
Vibration-exposed brackets and interior structures assembled from one accessible side.
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Bus manufacturing
Light structural joints where the collar is swaged after the pin is inserted.
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Sheet-metal production
Repeatable pin-and-collar installation where the rear face cannot be held.
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Trailer bodies
Small-diameter permanent joints in side rails, floor members and formed panels.
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Transport & bodywork
Trailer, bus and van panels joined blind from one side.
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Signage & cladding
Fast, vibration-resistant fixing of thin material.
Typical applications
- choosing brazier, truss or countersunk pin head geometry for the panel face
- matching collar style and grip to the combined material thickness
- installing a lockbolt where vibration would work a removable nut loose
- creating a permanent small-diameter pin-and-collar joint
- permanent joints in thin sheet where a threaded fastener would loosen
- blind fixing where only one side can be reached
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- Vibration
- Specified where cyclic load would loosen a plain nut or screw — rotating plant, rail, mobile equipment and anything that is not re-torqued in service.
Where to use something else
- Do not specify this permanent assembly where routine removal is part of the service plan.
- Not for a joint that has to come apart in service — removal means drilling the rivet out.
Full application guide: where Huck C6L Small-Diameter Lockbolt Assembly are used, how to specify them, and the cases they are wrong for
