What Is a Dowel Pin? A Complete Guide to Its Uses, Types, and Selection Tips

勝豐精密
Jul 14
2 min read

In industrial manufacturing, automation systems, and various mechanical assemblies, solid pins—also known as dowel pins or locating pins—are small components that play a crucial yet often overlooked role.

Though compact in size, dowel pins are essential for securing components, ensuring accurate alignment, and withstanding shear loads.

This article will walk you through the definition of dowel pins, material choices, standard classifications, and selection tips to help engineers and buyers quickly identify the right solution.

3 Core Functions of Dowel Pins

Precise AlignmentEnsures consistent positioning between assembled parts
Shear Force ResistanceEnhances structural strength when used alongside screws or bolts
Repeatable AssemblySupports disassembly and reassembly during maintenance and repair

Common Types and Specifications of Dowel Pins

Classification	Examples	Description
Material	Stainless Steel (SUS304, SUS316), Carbon Steel, Brass, Aluminum, PEEK	Selected based on corrosion resistance and mechanical strength
Surface Finish	Zinc Plating, Black Oxide, Electroless Nickel, Passivation	Improves rust protection and fitting accuracy
Dimensions	Metric / Inch sizes, Ø1–Ø20 mm standard diameters, custom lengths available	Designed to match hole tolerances (recommended: H7/m6) Common standards: DIN 7, ISO 2338, ISO 8734, DIN 6325

Dowel Pin Selection Tips

SUS304 or SUS316 is recommended for use in automation systems and semiconductor equipment
Heat-treated carbon steel is ideal for high-shear-load applications
H7 hole / m6 pin tolerance pairing is preferred for precision fit
For removable structures, consider slotted or spring pins