---
title: "What Are Elastomer-Sealing Nuts Used For?"
description: "Elastomer-Sealing Nuts (Trade series (elastomer-sealing nuts)) are used for sealing a threaded panel joint with an integrated elastomer element and matched c…"
url: https://engineeringhardware.com/applications/elastomer-sealing-nuts/
source: Engineering Hardware & Fasteners
---

# What Are Elastomer-Sealing Nuts Used For?

Nuts · Trade series (elastomer-sealing nuts) · Application guide

Typical applications, the industries that specify elastomer-sealing nuts, and how to choose the right size, material and finish for the joint.

Elastomer-Sealing Nuts are used for sealing a threaded panel joint with an integrated elastomer element and matched compression. They are manufactured to Trade series (elastomer-sealing nuts), 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:** Sealing a threaded panel joint with an integrated elastomer element and matched compression
- **Governing standard:** Trade series (elastomer-sealing nuts)
- **Thread size range:** M3 to M14
- **Category:** Nuts

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

![What Are Elastomer-Sealing Nuts Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Elastomer-Sealing-Nuts-APM-Hexseal-Seelnuts.webp)

Elastomer-Sealing Nuts are selected when an assembly calls for sealing a threaded panel joint with an integrated elastomer element and matched compression. This application guide to the Trade series (elastomer-sealing nuts) type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly M3 to M14, they cover general to heavy-duty work.

## Typical Applications for Elastomer-Sealing Nuts

The most common settings where these are specified:

- **Weatherproof enclosures:** Sealing nuts close a threaded panel joint against water and dust.
- **Control cabinets:** Silicone ribs seal mounting points without a separate loose gasket.
- **Outdoor equipment:** Plated steel supports the nut while the elastomer handles the interface.
- **Process instruments:** Metric class 6H threads mate with panel hardware selected for the seal.

Product catalog

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## How to Specify Elastomer-Sealing Nuts for Your Application

- **Size:** Match the nominal size to the mating thread or hole. This product spans M3–M14; 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 (elastomer-sealing nuts). 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 Elastomer-Sealing 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 Elastomer-Sealing 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 elastomer-sealing nuts outside the standard range?

Thread size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. 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 M3 Elastomer-Sealing Nuts to Trade series (elastomer-sealing nuts). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Pitch (mm):** 0.5
- **Sealing-rib height (mm):** 0.2
- **Thread class:** 6H
- **Seal material:** silicone elastomer
- **Temperature range (°C):** -75~+204
- **Finish:** zinc-chromate plated low-carbon steel

## Dimensions & Specifications (Trade series (elastomer-sealing nuts))

| Thread size | Pitch (mm) | Sealing-rib height (mm) | Thread class | Seal material | Temperature range (°C) | Finish |
| --- | --- | --- | --- | --- | --- | --- |
| M3 | 0.5 | 0.2 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M4 | 0.7 | 0.3 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M5 | 0.8 | 0.4 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M6 | 1.0 | 0.5 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M8 | 1.25 | 0.6 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M10 | 1.5 | 0.6 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M12 | 1.75 | 0.8 | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon steel |
| M14 | 2.0 |  | 6H | silicone elastomer | -75~+204 | zinc-chromate plated low-carbon 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](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

### How do I choose the right size of Elastomer-Sealing Nuts?

Match the nominal size to the mating thread or hole. This product is available from M3 to M14; the full dimension table on this page lists each size.

### Do Elastomer-Sealing 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.

### What material should Elastomer-Sealing Nuts 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 Elastomer-Sealing Nuts made to a recognized standard?

Yes — they are manufactured to Trade series (elastomer-sealing nuts), so dimensions are interchangeable between suppliers when you quote the standard on your order.

### Can I get a quote for Elastomer-Sealing 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: [Elastomer-Sealing Nuts — specifications & sizes](https://engineeringhardware.com/fastener/elastomer-sealing-nuts/)

### Elastomer-Sealing Nuts Specification Guides

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