---
title: "What Are Slotted Spring Pins, Heavy Duty Used For?"
description: "Slotted Spring Pins, Heavy Duty (ISO 8752 / DIN 1481) are used for retaining and locating parts in a drilled hole, gripping by their own spring force without…"
url: https://engineeringhardware.com/applications/slotted-spring-pins-iso-8752/
source: Engineering Hardware & Fasteners
---

# What Are Slotted Spring Pins, Heavy Duty Used For?

Pins · ISO 8752 / DIN 1481 · Application guide

Typical applications, the industries that specify slotted spring pins, heavy duty, and how to choose the right size, material and finish for the joint.

Slotted Spring Pins, Heavy Duty are used for retaining and locating parts in a drilled hole, gripping by their own spring force without a press fit. They are manufactured to ISO 8752 / DIN 1481, and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment.

- **Primary duty:** Retaining and locating parts in a drilled hole, gripping by their own spring force without a press fit
- **Governing standard:** ISO 8752 / DIN 1481
- **Nominal diameter range:** 1 mm to 13 mm
- **Category:** Pins

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

![What Are Slotted Spring Pins, Heavy Duty Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Slotted-Spring-Pins.webp)

Slotted Spring Pins, Heavy Duty (ISO 8752 / DIN 1481) are specified where the joint requires retaining and locating parts in a drilled hole, gripping by their own spring force without a press fit. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly 1 mm to 13 mm, they cover general to heavy-duty work.

## Typical Applications for Slotted Spring Pins, Heavy Duty

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.
- **Jigs & fixtures:** precise location of tooling plates and locating features.
- **Linkages & hinges:** pivot points carrying light shear.

## How to Specify Slotted Spring Pins, Heavy Duty for Your Application

- **Size:** Select on nominal diameter, then on the hole tolerance and fit class — the fit, not the diameter alone, determines whether the part locates or slips. This product spans 1 mm–13 mm; check the full table below for the exact dimensions of each size.
- **Material:** Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
- **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 ISO 8752 / DIN 1481. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

## Installation & Assembly Practice

- Ream the hole to the specified fit class; a dowel pressed into a drilled-only hole will not locate accurately.
- Press pins in with steady force rather than hammer blows where possible, and chamfer the hole entry.

## Common Selection Mistakes with Slotted Spring Pins, Heavy Duty

- Using a dowel pin as a load-carrying shear bolt — dowels locate, they are not sized for sustained shear.
- Ignoring the fit class: a locational fit and an interference fit need different hole tolerances.

## Where Slotted Spring Pins, Heavy Duty Are Not the Right Choice

Not for carrying significant tensile or repeated heavy shear loads — use a bolt or a keyed joint for that.

Custom manufacturing · Made to drawing

## Need a slotted spring pins, heavy duty outside the standard range?

Tolerance class is what a special pin usually turns on — a locating pin and a retaining pin want very different fits in the same nominal size. Made by cold heading or turning.

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

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

## Technical Drawing

Dimensioned line drawing of 1 Slotted Spring Pins, Heavy Duty to ISO 8752 / DIN 1481. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Nominal diameter d (mm):** 1
- **Diameter before insertion min (mm):** 1.2
- **Diameter before insertion max (mm):** 1.3
- **Wall thickness s (mm):** 0.2
- **Recommended hole H12 (mm):** 1
- **Double shear load (kN):** 0.70
- **Length l (mm):** 4~20

## Dimensions & Specifications (ISO 8752 / DIN 1481)

| Size | Nominal diameter d (mm) | Diameter before insertion min (mm) | Diameter before insertion max (mm) | Wall thickness s (mm) | Recommended hole H12 (mm) | Double shear load (kN) | Length l (mm) | Reference standard |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 1 | 1.2 | 1.3 | 0.2 | 1 | 0.70 | 4~20 | ISO 8752 / DIN 1481 |
| 1.5 | 1.5 | 1.7 | 1.8 | 0.3 | 1.5 | 1.58 | 4~20 | ISO 8752 / DIN 1481 |
| 2 | 2 | 2.3 | 2.4 | 0.4 | 2 | 2.82 | 5~20 | ISO 8752 / DIN 1481 |
| 2.5 | 2.5 | 2.8 | 2.9 | 0.5 | 2.5 | 4.38 | 5~20 | ISO 8752 / DIN 1481 |
| 3 | 3 | 3.3 | 3.5 | 0.6 | 3 | 6.32 | 6~20 | ISO 8752 / DIN 1481 |
| 3.5 | 3.5 | 3.8 | 4.0 | 0.75 | 3.5 | 9.06 | 8~24 | ISO 8752 / DIN 1481 |
| 4 | 4 | 4.4 | 4.6 | 0.8 | 4 | 11.24 | 8~24 | ISO 8752 / DIN 1481 |
| 5 | 5 | 5.4 | 5.6 | 1.0 | 5 | 17.54 | 10~30 | ISO 8752 / DIN 1481 |
| 6 | 6 | 6.4 | 6.7 | 1.25 | 6 | 26.04 | 12~36 | ISO 8752 / DIN 1481 |
| 8 | 8 | 8.5 | 8.8 | 1.5 | 8 | 42.76 | 20~60 | ISO 8752 / DIN 1481 |
| 10 | 10 | 10.5 | 10.8 | 2.0 | 10 | 70.16 | 20~90 | ISO 8752 / DIN 1481 |
| 12 | 12 | 12.5 | 12.8 | 2.5 | 12 | 104.1 | 20~160 | ISO 8752 / DIN 1481 |
| 13 | 13 | 13.5 | 13.8 | 2.5 | 13 | 115.1 | 20~180 | ISO 8752 / DIN 1481 |

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

### Which industries use Slotted Spring Pins, Heavy Duty?

They are commonly specified in linkages & hinges, machine alignment and general machine building, among other sectors.

### How do I choose the right size of Slotted Spring Pins, Heavy Duty?

Select on nominal diameter and on the fit the assembly requires. This product is available from 1 mm to 13 mm; the full dimension table on this page lists each size.

### What material should Slotted Spring Pins, Heavy Duty 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 Slotted Spring Pins, Heavy Duty made to a recognized standard?

Yes — they are manufactured to ISO 8752 / DIN 1481, so dimensions are interchangeable between suppliers when you quote the standard on your order.

### Can I get a quote for Slotted Spring Pins, Heavy Duty 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: [Slotted Spring Pins, Heavy Duty — specifications & sizes](https://engineeringhardware.com/fastener/slotted-spring-pins-iso-8752/)

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