---
title: "What Are Screw Eyes & Screw Hooks Used For?"
description: "Screw Eyes & Screw Hooks (Trade series (screw eye / cup hook)) are used for fixing into sheet, timber or plastic by forming their own thread as they are driv…"
url: https://engineeringhardware.com/applications/screw-eyes-and-hooks/
source: Engineering Hardware & Fasteners
---

# What Are Screw Eyes & Screw Hooks Used For?

Screws · Trade series (screw eye / cup hook) · Application guide

Typical applications, the industries that specify screw eyes & screw hooks, and how to choose the right size, material and finish for the joint.

Screw Eyes & Screw Hooks are used for fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole. They are manufactured to Trade series (screw eye / cup hook), and selection is driven by the screw size, the fit and tolerance the assembly requires, and the service environment.

- **Primary duty:** Fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole
- **Governing standard:** Trade series (screw eye / cup hook)
- **Screw size range:** 2.5 to 5
- **Category:** Screws

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

![What Are Screw Eyes & Screw Hooks Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Screw-Eyes-Hooks.webp)

Screw Eyes & Screw Hooks are used primarily for fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole. 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 Trade series (screw eye / cup hook). Stocked across roughly 2.5 to 5, they cover light-duty and instrument-scale work.

## Typical Applications for Screw Eyes & Screw Hooks

The most common settings where these are specified:

- **Appliances & consumer goods:** high-volume assembly with power tools and consistent seating.
- **Machine guarding & panels:** removable access covers that are opened for service.
- **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.

Product catalog

## Related Screw Eyes & Screw Hooks products

[![DIN444 Lifting Eye Bolt Zinc Plated Forged Lifting Rigging Eye Bolt](https://img.engineeringhardware.com/DIN444-Lifting-Eye-Bolt-Zinc-Plated-Forged-Lifting-Rigging-Eye-Bolt.webp)](https://engineeringhardware.com/product/din444-lifting-eye-bolt-zinc-plated-forged-lifting-rigging-eye-bolt-2/)

Eye Bolts & Lifting Eye Fasteners

### [DIN444 Lifting Eye Bolt Zinc Plated Forged Lifting Rigging Eye Bolt](https://engineeringhardware.com/product/din444-lifting-eye-bolt-zinc-plated-forged-lifting-rigging-eye-bolt-2/)

Round Head · DIN, ANSI, GB

**US$0.12 – 0.60**MOQ 1,000 pieces

[![Welded Eye Bolt with Lag Screw Thread for Timber and Wood Construction](https://img.engineeringhardware.com/Welded-Eye-Bolt-with-Lag-Screw-Thread-for-Timber-and-Wood-Construction.webp)](https://engineeringhardware.com/product/welded-eye-bolt-with-lag-screw-thread-for-timber-and-wood-construction/)

Eye Bolts & Lifting Eye Fasteners

### [Welded Eye Bolt with Lag Screw Thread for Timber and Wood Construction](https://engineeringhardware.com/product/welded-eye-bolt-with-lag-screw-thread-for-timber-and-wood-construction/)

Lifting Eye Bolt · DIN, ANSI, GB, JIS, BSW, GOST

**US$0.012 – 1.20**MOQ 1,000 pieces

[![Wholesale Hardware Rigging Lifting Eye Bolt with Metric Thread](https://img.engineeringhardware.com/Wholesale-Hardware-Rigging-Lifting-Eye-Bolt-with-Metric-Thread.webp)](https://engineeringhardware.com/product/wholesale-hardware-rigging-lifting-eye-bolt-with-metric-thread/)

Eye Bolts & Lifting Eye Fasteners

### [Wholesale Hardware Rigging Lifting Eye Bolt with Metric Thread](https://engineeringhardware.com/product/wholesale-hardware-rigging-lifting-eye-bolt-with-metric-thread/)

Round Head · DIN, ANSI, JIS, BSW, GOST

**US$0.24 – 240.00**MOQ 10 pieces

[![316 DIN580 Stainless Steel Cast Lifting Eye Bolts](https://img.engineeringhardware.com/316-DIN580-Stainless-Steel-Cast-Lifting-Eye-Bolts.webp)](https://engineeringhardware.com/product/316-din580-stainless-steel-cast-lifting-eye-bolts/)

Eye Bolts & Lifting Eye Fasteners

### [316 DIN580 Stainless Steel Cast Lifting Eye Bolts](https://engineeringhardware.com/product/316-din580-stainless-steel-cast-lifting-eye-bolts/)

Eye Bolt · DIN, ANSI, GB, JIS, BSW, GOST

**US$0.0036 – 0.012**MOQ 1 piece

[![Factory Directly Sales M6 M8 M10 Stainless Steel Long Shank Welded Eye Hook Bolts](https://img.engineeringhardware.com/Factory-Directly-Sales-M6-M8-M10-Stainless-Steel-Long-Shank-Welded-Eye-Hook-Bolts.webp)](https://engineeringhardware.com/product/factory-directly-sales-m6-m8-m10-stainless-steel-long-shank-welded-eye-hook-bolts/)

Eye Bolts & Lifting Eye Fasteners

### [Factory Directly Sales M6 M8 M10 Stainless Steel Long Shank Welded Eye Hook Bolts](https://engineeringhardware.com/product/factory-directly-sales-m6-m8-m10-stainless-steel-long-shank-welded-eye-hook-bolts/)

Eye Bolts · DIN, ANSI, GB, JIS, BSW, GOST, Per Customers'desire

**US$0.072 – 0.31**MOQ 5,000 pieces

[![Precast Concrete Lifting Clutches Lifting Eyes T Anchors](https://img.engineeringhardware.com/Precast-Concrete-Lifting-Clutches-Lifting-Eyes-T-Anchors.webp)](https://engineeringhardware.com/product/precast-concrete-lifting-clutches-lifting-eyes-t-anchors/)

Eye Bolts & Lifting Eye Fasteners

### [Precast Concrete Lifting Clutches Lifting Eyes T Anchors](https://engineeringhardware.com/product/precast-concrete-lifting-clutches-lifting-eyes-t-anchors/)

Lifting Clutch · Steel

**US$0.0012 – 36.00**MOQ 50 pieces

[View all Eye Bolts & Lifting Eye Fasteners →](https://engineeringhardware.com/fastener-products/bolts/eye-bolts-lifting-eye-fasteners/) [Full product catalog](https://engineeringhardware.com/products/)

## How to Specify Screw Eyes & Screw Hooks for Your Application

- **Size:** Match the nominal size to the mating thread or hole. This product spans 2.5–5; check the full table below for the exact dimensions of each size.
- **Drive & head:** Pick the drive (socket, cross, slot) and head style for the tool access and seating surface; a recessed drive resists cam-out under power tools.
- **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 (screw eye / cup hook). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

## Installation & Assembly Practice

- Match the driver exactly to the recess (PH ≠ PZ; hex key sizes per ISO 2936) and keep the tool axial — side load is the main cause of stripped drives.
- In tapped holes, engage a thread length of at least 1× the nominal diameter in steel, 2× in aluminum.
- Set power tools to a torque that seats the head without embedding it into the mating surface.

## Common Selection Mistakes with Screw Eyes & Screw Hooks

- Under-sizing the drive for the installation torque — a small recess at high torque strips before the screw is seated.
- Using a countersunk head in thin sheet where the countersink removes most of the load-bearing material.
- Specifying stainless in high-strength duty: A2-70 is roughly class 7 steel, not a 10.9 substitute.

## Where Screw Eyes & Screw Hooks Are Not the Right Choice

Not for high-preload structural joints (use a property-class bolt and nut), and not in thin sheet where a self-drilling or self-tapping type suits better.

Custom manufacturing · Made to drawing

## Need a screw eyes & screw hooks outside the standard range?

Dimensions, material, finish and form are specified from the drawing — a screw outside the standard range is a variation on existing tooling rather than a new design. Made by cold heading or warm forging.

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

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

## Technical Drawing

Dimensioned line drawing of 2.5 Screw Eyes & Screw Hooks to Trade series (screw eye / cup hook). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Form:** Closed eye
- **Eye inside diameter (mm):** 6
- **Screw length (mm):** 12
- **Overall length (mm):** 20
- **Working load (kg):** 10
- **Material:** Steel, zinc plated
- **Pilot hole (mm):** 1.6

## Dimensions & Specifications (Trade series (screw eye / cup hook))

| Nominal diameter (mm) | Form | Eye inside diameter (mm) | Screw length (mm) | Overall length (mm) | Working load (kg) | Material | Pilot hole (mm) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2.5 | Closed eye | 6 | 12 | 20 | 10 | Steel, zinc plated | 1.6 |
| 3.0 | Closed eye | 8 | 16 | 26 | 20 | Steel, zinc plated | 2.0 |
| 4.0 | Closed eye | 10 | 25 | 38 | 35 | Steel, zinc plated | 2.5 |
| 5.0 | Closed eye | 12 | 35 | 52 | 60 | A2 stainless | 3.2 |
| 3.0 | Open hook | 8 | 16 | 28 | 12 | Steel, brass plated | 2.0 |
| 4.0 | Open hook | 10 | 25 | 40 | 20 | Steel, zinc plated | 2.5 |

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 Screw Eyes & Screw Hooks 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 Screw Eyes & Screw Hooks made to a recognized standard?

Yes — they are manufactured to Trade series (screw eye / cup hook), so dimensions are interchangeable between suppliers when you quote the standard on your order.

### What are Screw Eyes & Screw Hooks used for?

Fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole. They are supplied to Trade series (screw eye / cup hook).

### Which industries use Screw Eyes & Screw Hooks?

They are commonly specified in appliances & consumer goods, machine guarding & panels and general machine building, among other sectors.

### Can I get a quote for Screw Eyes & Screw Hooks 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: [Screw Eyes & Screw Hooks — specifications & sizes](https://engineeringhardware.com/fastener/screw-eyes-and-hooks/)

### Screw Eyes & Screw Hooks Specification Guides

### Related Fastener Applications