---
title: "What Are Electrical Grounding Screws Used For?"
description: "Electrical Grounding Screws (Trade series (electrical grounding screws)) are used for bonding a conductor to a threaded electrical box with a correctly ident…"
url: https://engineeringhardware.com/applications/electrical-grounding-screws/
source: Engineering Hardware & Fasteners
---

# What Are Electrical Grounding Screws Used For?

Bolts · Trade series (electrical grounding screws) · Application guide

Typical applications, the industries that specify electrical grounding screws, and how to choose the right size, material and finish for the joint.

Electrical Grounding Screws are used for bonding a conductor to a threaded electrical box with a correctly identified grounding screw. They are manufactured to Trade series (electrical grounding screws), 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:** Bonding a conductor to a threaded electrical box with a correctly identified grounding screw
- **Governing standard:** Trade series (electrical grounding screws)
- **Nominal diameter range:** 10-32 to 10-32
- **Category:** Bolts

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

![What Are Electrical Grounding Screws Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Electrical-Grounding-Screws.webp)

Application guide for Electrical Grounding Screws to Trade series (electrical grounding screws). The core duty of the type is bonding a conductor to a threaded electrical box with a correctly identified grounding screw. The typical industries, the how-to-specify checklist, assembly practice and the exclusion cases are set out below. Stocked across roughly 10 mm to 10 mm, they cover general to heavy-duty work.

## Typical Applications for Electrical Grounding Screws

The most common settings where these are specified:

- **Electrical boxes:** Green grounding screws bond a conductor to a steel box.
- **Building wiring:** 10-32 box threads accept the documented grounding screw form.
- **Control panels:** Combination heads support slot or driver access during installation.
- **Electrical maintenance:** Known length and finish simplify replacement of a missing bonding screw.

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## How to Specify Electrical Grounding Screws for Your Application

- **Size:** Match the nominal size to the mating thread or hole. This product spans 10 mm–10 mm; check the full table below for the exact dimensions of each size.
- **Strength class:** Choose the property class (e.g. 8.8, 10.9, 12.9 or A2/A4 stainless) for the load and environment, and tighten to the matching torque so the joint relies on preload, not friction.
- **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 (electrical grounding screws). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

## Installation & Assembly Practice

- Tighten to the torque for the size and property class with a calibrated wrench — the joint is held by preload, not by the thread friction alone.
- Ensure at least one full thread projects beyond the nut after tightening, and never re-use a bolt that has been tightened into yield.
- Under slotted or oversized holes, fit a hardened washer so the preload does not relax into the hole edge.

## Common Selection Mistakes with Electrical Grounding Screws

- Specifying class 12.9 "to be safe" in a corrosive environment — high classes are more sensitive to hydrogen embrittlement and stress corrosion; 8.8 hot-dip galvanized often outlasts them outdoors.
- Choosing a length that puts the shear plane through the threaded portion when a plain shank (partially threaded bolt) was available.
- Mixing stainless bolts with plated-steel nuts: the joint loses its corrosion logic and can gall or seize.

## Where Electrical Grounding Screws Are Not the Right Choice

Not for permanent joints that will never be opened (a rivet or weld is cheaper), and not where the head must sit flush — use a countersunk screw instead.

Custom manufacturing · Made to drawing

## Need a electrical grounding screws outside the standard range?

Thread size and pitch, length, property class, drive form, head geometry and head marking are all specifiable — the standard part is where it starts, not where it stops. Made by cold heading or hot forging.

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

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

## Technical Drawing

Dimensioned line drawing of 10-32 Electrical Grounding Screws to Trade series (electrical grounding screws). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Length (in):** 3/8
- **Overall length (in):** 0.795~0.8
- **Head / drive:** slotted / two-way or four-way combination
- **Finish:** green zinc steel
- **Conductor use:** No. 10, 12 or 14 copper; No. 10 or 12 aluminum

## Dimensions & Specifications (Trade series (electrical grounding screws))

| Thread size | Length (in) | Overall length (in) | Head / drive | Finish | Conductor use |
| --- | --- | --- | --- | --- | --- |
| 10-32 | 3/8 | 0.795~0.8 | slotted / two-way or four-way combination | green zinc steel | No. 10, 12 or 14 copper; No. 10 or 12 aluminum |

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 material should Electrical Grounding Screws 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 Electrical Grounding Screws made to a recognized standard?

Yes — they are manufactured to Trade series (electrical grounding screws), so dimensions are interchangeable between suppliers when you quote the standard on your order.

### What are Electrical Grounding Screws used for?

Bonding a conductor to a threaded electrical box with a correctly identified grounding screw. They are supplied to Trade series (electrical grounding screws).

### Which industries use Electrical Grounding Screws?

They are commonly specified in control panels, electrical maintenance and electrical boxes, among other sectors.

### Can I get a quote for Electrical Grounding Screws 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: [Electrical Grounding Screws — specifications & sizes](https://engineeringhardware.com/fastener/electrical-grounding-screws/)

### Electrical Grounding Screws Specification Guides

### Related Fastener Applications