Internally Threaded Dowel Pin (GB/T 120.1 / ISO 8735) are specified where the joint requires precise location and light shear duty between two parts. 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 M4 to M20, they cover general to heavy-duty work.
Typical Applications for Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 100)
The most common settings where these are specified:
- 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.
- Machine alignment: dowelling mating housings so they reassemble in the same position.
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
How to Specify Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 100) for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M4–M20; 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 GB/T 120.1 / ISO 8735. 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 Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 100)
- 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 Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 100) Are Not the Right Choice
Not for carrying significant tensile or repeated heavy shear loads — use a bolt or a keyed joint for that.