---
title: "What Are All-Metal Hex Flange Lock Nuts Used For?"
description: "All-Metal Hex Flange Lock Nuts (GB/T 6187 / DIN 6927 / ASME B18.2.2) are used for the clamped counter-face of a bolted joint. Catalogued 8 mm to 12 mm."
url: https://engineeringhardware.com/applications/all-metal-hex-flange-lock-nuts/
source: Engineering Hardware & Fasteners
---

# What Are All-Metal Hex Flange Lock Nuts Used For?

Nuts · GB/T 6187 / DIN 6927 / ASME B18.2.2 · Application guide

Typical applications, the industries that specify all-metal hex flange lock nuts, and how to choose the right size, material and finish for the joint.

All-Metal Hex Flange Lock Nuts are used for the clamped counter-face of a bolted joint. They are manufactured to GB/T 6187 / DIN 6927 / ASME B18.2.2, 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:** The clamped counter-face of a bolted joint
- **Governing standard:** GB/T 6187 / DIN 6927 / ASME B18.2.2
- **Nominal diameter range:** 8 mm to 12 mm
- **Category:** Nuts

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

![What Are All-Metal Hex Flange Lock Nuts Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/All-Metal-Hex-Flange-Lock-Nuts.webp)

All-Metal Hex Flange Lock Nuts are used primarily for the clamped counter-face of a bolted joint. 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 GB/T 6187 / DIN 6927 / ASME B18.2.2. Stocked across roughly 8 mm to 12 mm, they cover general to heavy-duty work.

## Typical Applications for All-Metal Hex Flange Lock Nuts

The most common settings where these are specified:

- **Frames & weldments:** captive or welded options for repeatable assembly.
- **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.

Product catalog

## Related Flange Lock Nuts (Nylon & All-Metal) products

[![Nylon Insert Lock Nut with Hex Design, Ideal for Furniture and Electrical Hardware](https://img.engineeringhardware.com/Nylon-Insert-Lock-Nut-with-Hex-Design-Ideal-for-Furniture-and-Electrical-Hardware.webp)](https://engineeringhardware.com/product/nylon-insert-lock-nut-with-hex-design-ideal-for-furniture-and-electrical-hardware/)

Nylon-Insert & All-Metal Lock Nuts

### [Nylon Insert Lock Nut with Hex Design, Ideal for Furniture and Electrical Hardware](https://engineeringhardware.com/product/nylon-insert-lock-nut-with-hex-design-ideal-for-furniture-and-electrical-hardware/)

Hexagon Head · DIN, ANSI, GB, BSW, ASME

**US$816.00 – 1,440**MOQ 1 ton

[![Zinc Plated Nylon Nut Hex Lock Nut](https://img.engineeringhardware.com/Zinc-Plated-Nylon-Nut-Hex-Lock-Nut.webp)](https://engineeringhardware.com/product/zinc-plated-nylon-nut-hex-lock-nut/)

Nylon-Insert & All-Metal Lock Nuts

### [Zinc Plated Nylon Nut Hex Lock Nut](https://engineeringhardware.com/product/zinc-plated-nylon-nut-hex-lock-nut/)

Hexagon Head · DIN, ANSI

**US$0.0432**MOQ 1,000 pieces

[![High Tensile Stainless Steel K-Lock Nut Automotive Chassis Anti-Loose Hardware](https://img.engineeringhardware.com/High-Tensile-Stainless-Steel-K-Lock-Nut-Automotive-Chassis-Anti-Loose-Hardware.webp)](https://engineeringhardware.com/product/high-tensile-stainless-steel-k-lock-nut-automotive-chassis-anti-loose-hardware/)

Nylon-Insert & All-Metal Lock Nuts

### [High Tensile Stainless Steel K-Lock Nut Automotive Chassis Anti-Loose Hardware](https://engineeringhardware.com/product/high-tensile-stainless-steel-k-lock-nut-automotive-chassis-anti-loose-hardware/)

Hexagon Head · DIN, ANSI, GB

**US$0.012 – 0.018**MOQ 3,000 pieces

[![DIN 6926 A2-70 Hexagon Flange Lock Nuts Nylon Insert Nut](https://img.engineeringhardware.com/DIN-6926-A2-70-Hexagon-Flange-Lock-Nuts-Nylon-Insert-Nut.webp)](https://engineeringhardware.com/product/din-6926-a2-70-hexagon-flange-lock-nuts-nylon-insert-nut/)

Nylon-Insert & All-Metal Lock Nuts

### [DIN 6926 A2-70 Hexagon Flange Lock Nuts Nylon Insert Nut](https://engineeringhardware.com/product/din-6926-a2-70-hexagon-flange-lock-nuts-nylon-insert-nut/)

Hexagon Head · DIN, ANSI, GB, JIS, BSW

**US$0.26 – 0.54**MOQ 10,000 pieces

[![ISO 7042 DIN980 Stainless Steel Class 8 Conical Top Lock Hex Nut Class 10 Hardened](https://img.engineeringhardware.com/ISO-7042-DIN980-Stainless-Steel-Class-8-Conical-Top-Lock-Hex-Nut-Class-10-Hardened.webp)](https://engineeringhardware.com/product/iso-7042-din980-stainless-steel-class-8-conical-top-lock-hex-nut-class-10-hardened/)

Nylon-Insert & All-Metal Lock Nuts

### [ISO 7042 DIN980 Stainless Steel Class 8 Conical Top Lock Hex Nut Class 10 Hardened](https://engineeringhardware.com/product/iso-7042-din980-stainless-steel-class-8-conical-top-lock-hex-nut-class-10-hardened/)

Top Lock Nuts · DIN, ANSI, GB, JIS, GOST, BSW

**US$0.012 – 0.12**MOQ 1,000 pieces

[![Connection Accessories Round Insert Metal Lock Nut for Building](https://img.engineeringhardware.com/Connection-Accessories-Round-Insert-Metal-Lock-Nut-for-Building.webp)](https://engineeringhardware.com/product/connection-accessories-round-insert-metal-lock-nut-for-building/)

Nylon-Insert & All-Metal Lock Nuts

### [Connection Accessories Round Insert Metal Lock Nut for Building](https://engineeringhardware.com/product/connection-accessories-round-insert-metal-lock-nut-for-building/)

DIN, ANSI, GB, JIS · Brass,Copper; Carbon Steel Stainless Steel

**US$0.006 – 1.20**MOQ 100 pieces

[View all Nylon-Insert & All-Metal Lock Nuts →](https://engineeringhardware.com/fastener-products/nuts/nylon-insert-all-metal-lock-nuts/) [Full product catalog](https://engineeringhardware.com/products/)

## How to Specify All-Metal Hex Flange Lock Nuts for Your Application

- **Size:** Match the nominal size to the mating thread or hole. This product spans 8 mm–12 mm; 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 GB/T 6187 / DIN 6927 / ASME B18.2.2. 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 All-Metal Hex Flange Lock 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 All-Metal Hex Flange Lock 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 all-metal hex flange lock 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 8 All-Metal Hex Flange Lock Nuts to GB/T 6187 / DIN 6927 / ASME B18.2.2. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Material:** carbon steel
- **Locking method:** deformed all-metal thread
- **Finish options:** black oxide or zinc
- **Service:** general vibration-exposed joints

## Dimensions & Specifications (GB/T 6187 / DIN 6927 / ASME B18.2.2)

| Strength class | Material | Locking method | Finish options | Service |
| --- | --- | --- | --- | --- |
| 8 | carbon steel | deformed all-metal thread | black oxide or zinc | general vibration-exposed joints |
| 10 | carbon steel or alloy steel | deformed all-metal thread | black oxide or zinc | higher-preload vibration service |
| 12 | alloy steel | deformed all-metal thread | black oxide or zinc | high-temperature and high-preload service |

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

### Are All-Metal Hex Flange Lock Nuts made to a recognized standard?

Yes — they are manufactured to GB/T 6187 / DIN 6927 / ASME B18.2.2, so dimensions are interchangeable between suppliers when you quote the standard on your order.

### What are All-Metal Hex Flange Lock Nuts used for?

The clamped counter-face of a bolted joint. They are supplied to GB/T 6187 / DIN 6927 / ASME B18.2.2.

### Which industries use All-Metal Hex Flange Lock Nuts?

They are commonly specified in maintenance & repair (mro), fabrication & metalwork and bolted joints, among other sectors.

### How do I choose the right size of All-Metal Hex Flange Lock Nuts?

Match the nominal size to the mating thread or hole. This product is available from 8 mm to 12 mm; the full dimension table on this page lists each size.

### Can I get a quote for All-Metal Hex Flange Lock 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: [All-Metal Hex Flange Lock Nuts — specifications & sizes](https://engineeringhardware.com/fastener/all-metal-hex-flange-lock-nuts/)

### All-Metal Hex Flange Lock Nuts Specification Guides

### Related Fastener Applications