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Rivets · BS 7805 Part 2:1997 · Application guide

What Are Huck C50L Large-Diameter Lockbolt Assembly Used For?

Typical applications, the industries that specify huck c50l large-diameter lockbolt assembly, and how to choose the right size, material and finish for the joint.

Huck C50L Large-Diameter Lockbolt Assemblies are used for large-diameter swaged lockbolt joints in thick structural sections. They are manufactured to BS 7805 Part 2:1997, and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Large-diameter swaged lockbolt joints in thick structural sections
Governing standard
BS 7805 Part 2:1997
Nominal diameter range
12.7 mm to 34.9 mm
Category
Rivets

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

What Are Huck C50L Large-Diameter Lockbolt Assembly Used For? application image

Huck C50L Large-Diameter Lockbolt Assemblies are used primarily for large-diameter swaged lockbolt joints in thick structural sections. This page lists the industries and assemblies where they are specified, the selection criteria that matter for each application, installation practice, and the cases where a different fastener type is the correct choice. Parts are supplied to BS 7805 Part 2:1997. Stocked across roughly 12.7 mm to 34.9 mm, they cover heavy and structural work.

Typical Applications for Huck C50L Large-Diameter Lockbolt Assembly

The most common settings where these are specified:

  • Heavy truck frames: large-diameter structural joints in rails and crossmembers.
  • Earthmoving equipment: bucket, boom and chassis structures subject to shock.
  • Rail vehicles: high-cycle structures that need a permanent mechanical lock.
  • Steel plant fabrication: thick-section one-side joints using large pin and collar combinations.

How to Specify Huck C50L Large-Diameter Lockbolt Assembly for Your Application

  • Size: Select on nominal diameter, then on the hole tolerance and fit class — the fit, not the diameter alone, determines whether the part locates or slips. This product spans 12.7 mm–34.9 mm; check the full table below for the exact dimensions of each size.
  • Material: Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
  • Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
  • Standard: This product is supplied to BS 7805 Part 2:1997. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Drill the hole 0.1 mm over the nominal rivet diameter and deburr both sides before setting.
  • Grip range must match the total joint thickness — a rivet set outside its grip range clamps poorly and works loose.

Common Selection Mistakes with Huck C50L Large-Diameter Lockbolt Assembly

  • Setting a rivet outside its grip range, which leaves the joint loose from day one.
  • Using aluminum rivets on steel sheet outdoors — galvanic corrosion eats the rivet.

Where Huck C50L Large-Diameter Lockbolt Assembly Are Not the Right Choice

Not where the joint must later be disassembled, and not for high-tension structural connections.

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
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

Can Huck C50L Large-Diameter Lockbolt Assembly joints be taken apart?

No — rivets form a permanent joint and must be drilled out to remove. Use a bolt or screw where you need to disassemble the joint later.

What material should Huck C50L Large-Diameter Lockbolt Assembly be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are Huck C50L Large-Diameter Lockbolt Assembly made to a recognized standard?

Yes — they are manufactured to BS 7805 Part 2:1997, so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Huck C50L Large-Diameter Lockbolt Assembly used for?

Large-diameter swaged lockbolt joints in thick structural sections. They are supplied to BS 7805 Part 2:1997.

Can I get a quote for Huck C50L Large-Diameter Lockbolt Assembly in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.