---
title: "What Are Tee Nuts (Pronged Insert Nuts) Used For?"
description: "Tee Nuts (Pronged Insert Nuts) (Trade series (pronged T-nut)) are used for putting a machine thread into timber, plywood or board where the fixing is repeate…"
url: https://engineeringhardware.com/applications/tee-nuts/
source: Engineering Hardware & Fasteners
---

# What Are Tee Nuts (Pronged Insert Nuts) Used For?

Nuts · Trade series (pronged T-nut) · Application guide

Typical applications, the industries that specify tee nuts (pronged insert nuts), and how to choose the right size, material and finish for the joint.

Tee Nuts (Pronged Insert Nuts) are used for putting a machine thread into timber, plywood or board where the fixing is repeatedly assembled and disassembled. They are manufactured to Trade series (pronged T-nut), and the choice of size, property class and finish is driven by the load in the joint and the environment it sits in.

- **Primary duty:** Putting a machine thread into timber, plywood or board where the fixing is repeatedly assembled and disassembled
- **Governing standard:** Trade series (pronged T-nut)
- **Thread size range:** M4 to M10
- **Category:** Nuts

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

![What Are Tee Nuts (Pronged Insert Nuts) Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Tee-Nuts-Applications.webp)

The primary duty of Tee Nuts (Pronged Insert Nuts) is putting a machine thread into timber, plywood or board where the fixing is repeatedly assembled and disassembled. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly M4 to M10, they cover general to heavy-duty work.

## Typical Applications for Tee Nuts (Pronged Insert Nuts)

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.
- **Bolted joints:** the clamping counter-face on studs and bolts across every assembly type.
- **Vibration-prone equipment:** where a locking or flanged style resists loosening.

Product catalog

## Related Tee Nuts products

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[View all T-Nuts, Slot Nuts & Channel Spring Nuts →](https://engineeringhardware.com/fastener-products/nuts/t-nuts-slot-nuts-channel-spring-nuts/) [Full product catalog](https://engineeringhardware.com/products/)

## How to Specify Tee Nuts (Pronged Insert Nuts) for Your Application

- **Size:** Match the nominal size to the mating thread or hole. This product spans M4–M10; check the full table below for the exact dimensions of each size.
- **Locking & grade:** Match the strength grade to the bolt, and choose a locking style (nyloc, all-metal, serrated flange) if the joint sees vibration.
- **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 (pronged T-nut). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

## Installation & Assembly Practice

- Run the nut down by hand before applying the wrench to catch cross-threading early.
- Tighten the nut rather than the bolt head where access allows — the torque-to-preload relation is more consistent.
- For locking styles, note that nyloc inserts are single-use in critical joints and lose grip above roughly 120 °C.

## Common Selection Mistakes with Tee Nuts (Pronged Insert Nuts)

- Pairing a high-class bolt with a lower-class nut — the nut strips before the bolt reaches proof load; the nut class must meet or exceed the bolt class.
- Using a plain nut with a spring washer in severe vibration instead of a prevailing-torque locking nut.
- Re-using nyloc nuts in critical joints.

## Where Tee Nuts (Pronged Insert Nuts) Are Not the Right Choice

Not on their own — they need a matching bolt or stud — and a plain nut is not a substitute for a locking type under heavy vibration.

Custom manufacturing · Made to drawing

## Need a tee nuts (pronged insert nuts) outside the standard range?

Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

[Custom nut manufacturing](https://engineeringhardware.com/custom/nuts/)[Send a drawing](https://engineeringhardware.com/custom/nuts/#rfq)

## Technical Drawing

Dimensioned line drawing of M4 Tee Nuts (Pronged Insert Nuts) to Trade series (pronged T-nut). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Barrel diameter (mm):** 7.0
- **Barrel length (mm):** 9.0
- **Flange diameter (mm):** 17.0
- **Prongs:** 4
- **Drill hole in timber (mm):** 7.0
- **Material:** Mild steel
- **Finish:** Zinc plated

## Dimensions & Specifications (Trade series (pronged T-nut))

| Thread size | Barrel diameter (mm) | Barrel length (mm) | Flange diameter (mm) | Prongs | Drill hole in timber (mm) | Material | Finish |
| --- | --- | --- | --- | --- | --- | --- | --- |
| M4 | 7.0 | 9.0 | 17.0 | 4 | 7.0 | Mild steel | Zinc plated |
| M5 | 8.0 | 9.0 | 19.0 | 4 | 8.0 | Mild steel | Zinc plated |
| M6 | 9.0 | 11.0 | 22.0 | 4 | 9.0 | Mild steel | Zinc plated |
| M8 | 11.0 | 13.0 | 25.0 | 4 | 11.0 | Mild steel | Zinc plated |
| M10 | 13.0 | 13.0 | 30.0 | 4 | 13.0 | Mild steel | Zinc plated |

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](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 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 Tee Nuts (Pronged Insert Nuts) used for?

Putting a machine thread into timber, plywood or board where the fixing is repeatedly assembled and disassembled. They are supplied to Trade series (pronged T-nut).

### Which industries use Tee Nuts (Pronged Insert Nuts)?

They are commonly specified in fabrication & metalwork, bolted joints and vibration-prone equipment, among other sectors.

### How do I choose the right size of Tee Nuts (Pronged Insert Nuts)?

Match the nominal size to the mating thread or hole. This product is available from M4 to M10; the full dimension table on this page lists each size.

### Do Tee Nuts (Pronged Insert Nuts) need a locking feature?

If the joint sees vibration or cyclic load, use a locking style (nyloc, all-metal lock, or serrated flange) or a thread-locking adhesive. For static joints a standard nut tightened correctly is usually sufficient.

### Can I get a quote for Tee Nuts (Pronged Insert Nuts) 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.

## Related Pages

Product page: [Tee Nuts (Pronged Insert Nuts) — specifications & sizes](https://engineeringhardware.com/fastener/tee-nuts/)

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