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Rivets · BS 7805 Part 2:1997

BS 7805 Huck C50L Large-Diameter Lockbolt Assembly Specification

Dimensional table, tolerance classes and the DIN / ISO / ASME parts that supersede or match this standard.

BS 7805 specifies the dimensions and tolerances for huck c50l large-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 C50L Large-Diameter Lockbolt Assembly
Governing standards
BS 7805 Part 2:1997

Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.

BS 7805 Huck C50L Large-Diameter Lockbolt Assembly Specification reference image

Specification summary of BS 7805 as applied to huck c50l large-diameter lockbolt assembly: the dimensions the standard fixes, the full size range supplied, and the related designations commonly cross-referenced.

BS 7805 — Scope

BS 7805 specifies the dimensional requirements for huck c50l large-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 c50l large-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 stylesCollar stylesStrength gradeAssemblyMaterial optionsReference standard
12.7round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
15.9round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
19.1round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
22.2round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
25.4round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
28.6round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
31.8round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
34.9round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997

Equivalent Standards

Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Huck C50L Large-Diameter Lockbolt Assembly page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.

Companion Standards

BS 7805 controls only the geometry of huck c50l large-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.

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

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Specification
Business Information

Dimensions & Specifications (BS 7805 Part 2:1997)

Nominal diameter (mm)Pin head stylesCollar stylesStrength gradeAssemblyMaterial optionsReference standard
12.7round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
15.9round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
19.1round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
22.2round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
25.4round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
28.6round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
31.8round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997
34.9round / truss / countersunk / threaded-headstandard / flanged / low-profile8.8pin + collarsteel / stainless steel / aluminum alloyBS 7805 Part 2:1997

Applications & Industries

The sectors that buy Huck C50L Large-Diameter Lockbolt Assembly to BS 7805 Part 2:1997, and the duty each one buys them for. Stocked from 12.7 to 34.9 (nominal diameter).

Industries that specify Huck C50L Large-Diameter Lockbolt Assembly

  • Earthmoving equipment Bucket, boom and chassis structures subject to shock and vibration.
  • Rail vehicles High-cycle structural assemblies that need a swaged mechanical lock.
  • Steel plant fabrication Thick-section one-side joints using large pin and collar combinations.
  • Heavy truck frames Large-diameter structural joints in rails, crossmembers and chassis sections.
  • Transport & bodywork Trailer, bus and van panels joined blind from one side.
  • Signage & cladding Fast, vibration-resistant fixing of thin material.

Typical applications

  • selecting a round, truss, countersunk or threaded-head pin form
  • matching the collar profile to the joint access and bearing surface
  • building permanent connections where a large removable bolt is impractical
  • forming a large-diameter structural pin-and-collar joint
  • riveted pivots that must stay tight but still turn
  • permanent joints in thin sheet where a threaded fastener would loosen

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 treat the swaged collar as a conventional nut if the joint must be removed without cutting.
  • Not for a joint that has to come apart in service — removal means drilling the rivet out.

Full application guide: where Huck C50L Large-Diameter Lockbolt Assembly are used, how to specify them, and the cases they are wrong for

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

What does BS 7805 specify for Huck C50L Large-Diameter Lockbolt Assembly?

BS 7805 specifies the dimensions and tolerances of huck c50l large-diameter lockbolt assembly. Material and property class are governed by separate standards in the same family.

Does BS 7805 specify the mechanical strength?

No. BS 7805 controls the dimensional requirements for huck c50l large-diameter lockbolt assembly. Mechanical performance is set by the standards specific to this part family — ISO 898-1 and ISO 898-2 apply to bolts, screws and nuts and do not cover this product.

Can I substitute BS 7805 for the corresponding DIN standard on a drawing?

On modern drawings the ISO standard is the master reference; the older DIN equivalent is a cross-reference. For most dimensional purposes the parts are interchangeable, but check tolerance grades and the head height — these are the most common points of divergence.

Which edition of BS 7805 does this table follow?

The table reproduces the dimensions we supply huck c50l large-diameter lockbolt assembly to. We do not publish an edition year against it, so where the edition is contractually significant, cite the edition you require on the enquiry and we will confirm it against the table before quoting.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.