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Threaded Inserts · Trade series (pressed tube-end inserts) · Application guide

What Are Tube-End Threaded Inserts Used For?

Typical applications, the industries that specify tube-end threaded inserts, and how to choose the right size, material and finish for the joint.

Tube-End Threaded Inserts are used for adding a retained internal thread to a round or square tube through a pressed crown or flange. They are manufactured to Trade series (pressed tube-end inserts), and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Adding a retained internal thread to a round or square tube through a pressed crown or flange
Governing standard
Trade series (pressed tube-end inserts)
Category
Threaded Inserts

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

What Are Tube-End Threaded Inserts Used For? application image

Tube-End Threaded Inserts (Trade series (pressed tube-end inserts)) are specified where the joint requires adding a retained internal thread to a round or square tube through a pressed crown or flange. 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.

Typical Applications for Tube-End Threaded Inserts

The most common settings where these are specified:

  • Tubular furniture: Pressed end inserts add a threaded point without welding a nut inside the tube.
  • Display frames: Round and square tube versions support removable brackets.
  • Light machinery: Crown retention holds a stud or screw connection at the tube end.
  • Fabricated enclosures: Zinc-plated steel provides a practical general-purpose insert.

How to Specify Tube-End Threaded Inserts for Your Application

  • Size: Match the size to the mating part — see the dimension table below for each option.
  • Tap & length: Drill and tap to the specified STI size, and pick insert length (commonly 1.5×D or 2×D) for the load and parent material strength.
  • 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 (pressed tube-end inserts). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Drill and tap with the specified STI tap — a standard tap will not produce the correct thread for the insert.
  • Install to the specified depth (typically 0.25–0.5 mm below the surface) and remove the tang where the design requires it.

Common Selection Mistakes with Tube-End Threaded Inserts

  • Fitting an insert into strong steel that already holds a thread — added cost for no gain.
  • Skipping the tang removal, which then blocks the mating screw.

Where Tube-End Threaded Inserts Are Not the Right Choice

Not a fix for a hole that is already oversized beyond the STI tap range, and not needed in steel that already holds a thread well.

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 (pressed tube-end inserts))

Tube formThread sizeTube dimension / inside diameter (mm)Insert code exampleRetentionMaterial options
round tubeM8inside diameter 20.5ITT2T/M8/19.5pressed crown / flangesteel / zinc-plated steel
square tubeM620u00d720ITQ2S/M6/18.9pressed crown / flangesteel / zinc-plated steel
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 material should Tube-End Threaded Inserts 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 Tube-End Threaded Inserts made to a recognized standard?

Yes — they are manufactured to Trade series (pressed tube-end inserts), so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Tube-End Threaded Inserts used for?

Adding a retained internal thread to a round or square tube through a pressed crown or flange. They are supplied to Trade series (pressed tube-end inserts).

Which industries use Tube-End Threaded Inserts?

They are commonly specified in tubular furniture, display frames and light machinery, among other sectors.

Can I get a quote for Tube-End Threaded Inserts 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.