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Anchors & Concrete Fixings · Trade series (serrated metal expansion tubes) · Application guide

What Are Metal Serrated Expansion Wall Plugs Used For?

Typical applications, the industries that specify metal serrated expansion wall plugs, and how to choose the right size, material and finish for the joint.

Metal Serrated Expansion Wall Plugs are used for fixing steelwork, plant and services to concrete and masonry, where the anchor is set in a drilled hole and its capacity is governed by the base material rather than by the steel. They are manufactured to Trade series (serrated metal expansion tubes), and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Fixing steelwork, plant and services to concrete and masonry, where the anchor is set in a drilled hole and its capacity is governed by the base material rather than by the steel
Governing standard
Trade series (serrated metal expansion tubes)
Nominal diameter range
6 x 14 to 10 x 25
Category
Anchors & Concrete Fixings

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

What Are Metal Serrated Expansion Wall Plugs Used For? application image

Metal Serrated Expansion Wall Plugs (Trade series (serrated metal expansion tubes)) are specified where the joint requires fixing steelwork, plant and services to concrete and masonry, where the anchor is set in a drilled hole and its capacity is governed by the base material rather than by the steel. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly 6 mm to 10 mm, they cover general to heavy-duty work.

Typical Applications for Metal Serrated Expansion Wall Plugs

The most common settings where these are specified:

  • General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
  • Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
  • Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
  • Structural fixing to concrete: base plates, brackets, rails and steelwork bolted to a concrete slab or wall.
  • Building services: suspending cable tray, ductwork, sprinkler pipe and unistrut from a soffit.

How to Specify Metal Serrated Expansion Wall Plugs for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans 6 mm–10 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 Trade series (serrated metal expansion tubes). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Where Metal Serrated Expansion Wall Plugs Are Not the Right Choice

Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure.

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 (Trade series (serrated metal expansion tubes))

Plug size (mm)Sleeve length (mm)Drill size (mm)Mating screw threadMaterial and finishInstallation
6 x 14146M6carbon steel / galvanized iron, yellow zinc plateddrill, hammer the sleeve in, tighten the screw to expand the serrations
8 x 208M8carbon steel / galvanized iron, yellow zinc plateddrill, hammer the sleeve in, tighten the screw to expand the serrations
10 x 2510M10carbon steel / galvanized iron, yellow zinc plateddrill, hammer the sleeve in, tighten the screw to expand the serrations
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

Which industries use Metal Serrated Expansion Wall Plugs?

They are commonly specified in maintenance & repair (mro), fabrication & metalwork and structural fixing to concrete, among other sectors.

How do I choose the right size of Metal Serrated Expansion Wall Plugs?

Match the nominal size to the mating thread or hole. This product is available from 6 mm to 10 mm; the full dimension table on this page lists each size.

What material should Metal Serrated Expansion Wall Plugs 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 Metal Serrated Expansion Wall Plugs made to a recognized standard?

Yes — they are manufactured to Trade series (serrated metal expansion tubes), so dimensions are interchangeable between suppliers when you quote the standard on your order.

Can I get a quote for Metal Serrated Expansion Wall Plugs 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.