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Anchors & Concrete Fixings · Trade series (displacement-controlled anchor) · Application guide

What Are Drop-In Anchors (Internally Threaded) Used For?

Typical applications, the industries that specify drop-in anchors (internally threaded), and how to choose the right size, material and finish for the joint.

Drop-In Anchors (Internally Threaded) are used for providing a flush, internally threaded fixing point in concrete so the bolt — and the fixture with it — can be removed and replaced without disturbing the anchor. They are manufactured to Trade series (displacement-controlled anchor), and selection is driven by the thread size, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Providing a flush, internally threaded fixing point in concrete so the bolt — and the fixture with it — can be removed and replaced without disturbing the anchor
Governing standard
Trade series (displacement-controlled anchor)
Thread size range
M6 to M16
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 Drop-In Anchors (Internally Threaded) Used For? application image

Drop-In Anchors (Internally Threaded) are used primarily for providing a flush, internally threaded fixing point in concrete so the bolt — and the fixture with it — can be removed and replaced without disturbing the anchor. 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 Trade series (displacement-controlled anchor). Stocked across roughly M6 to M16, they cover general to heavy-duty work.

Typical Applications for Drop-In Anchors (Internally Threaded)

The most common settings where these are specified:

  • Fit-out & drylining: fixing to plasterboard, block and hollow wall where there is no solid backing.
  • 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.

How to Specify Drop-In Anchors (Internally Threaded) for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans M6–M16; 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 (displacement-controlled anchor). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Where Drop-In Anchors (Internally Threaded) 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 (displacement-controlled anchor))

Internal threadDrill hole diameter (mm)Embedment depth (mm)Body length (mm)Setting tool requiredFlush with surfaceMaterialBase material
M682525YesYesZinc plated steelConcrete C20/25 and above
M8103030YesYesZinc plated steelConcrete C20/25 and above
M10124040YesYesZinc plated steelConcrete C20/25 and above
M12165050YesYesZinc plated steelConcrete C20/25 and above
M16206565YesYesZinc plated steelConcrete C20/25 and above
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 are Drop-In Anchors (Internally Threaded) used for?

Providing a flush, internally threaded fixing point in concrete so the bolt — and the fixture with it — can be removed and replaced without disturbing the anchor. They are supplied to Trade series (displacement-controlled anchor).

Which industries use Drop-In Anchors (Internally Threaded)?

They are commonly specified in structural fixing to concrete, building services and plant & machine installation, among other sectors.

How do I choose the right size of Drop-In Anchors (Internally Threaded)?

Match the nominal size to the mating thread or hole. This product is available from M6 to M16; the full dimension table on this page lists each size.

What material should Drop-In Anchors (Internally Threaded) 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.

Can I get a quote for Drop-In Anchors (Internally Threaded) 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.