Dowel pins are commonly used in many industries including automotive, aerospace, agriculture and transport. They function as a shaft or hinge to hold and align assembled parts in place – and if you are a manufacturer working with assemblies of any kind, the chances are that you are already familiar with precision dowels. But if you’d like to know more about these simple, yet highly effective fasteners, then read on:
Dowel pins are manufactured as solid, cylindrical metal pins to precise diameters and lengths. They are available in a wide range of sizes, styles and materials.
Dowel pin sizes:
Standard dowel pin sizes include metric sizes from M1 to M20 diameter – or 1/16” to 1” diameter in imperial sizes—with varying options of lengths. We specialise in custom-made small diameter precision dowels which range from 0.80mm to 6.00mm diameter and up to 150mm in length and can accommodate non-standard sizes when an ‘off the shelf’ option won’t fit the needs of a specialist application.
Radius or chamfer – what’s the difference?
There are lots of options to consider when selecting a dowel pin. Precision dowels are produced with either a double chamfer or radius, or with a chamfer at one end and a radius at the other.
Both finishes are designed to remove sharp edges and aid the dowel pins insertion. A radius is designed to be rounded off at the ends, whereas a chamfer is a slanted finish created at the corner.
Threaded and tapered dowel pins
Threaded dowel pins are useful if the pin needs to be removed from a blind hole at any point after installation. In this situation, a pin can be tapped with an internal thread and be removed quickly using a dowel pin extractor tool – and the pin can then be reused.
Tapered dowel pins have a slightly larger diameter at one end, usually a 1 in 50 taper for metric sizes and 1 in 48 for imperial. They are often used for low torque positioning and locking in many types of mechanical assemblies.
Installing precision dowels
Dowel pin installation is designed to be fast and easy; the pins can simply be pressed in for the best results—you should never drive the pin into the hole with force. The simplicity of these types of pin means that there are no complicated or secondary operations required, which means production times are faster.
Why choose Widmer?
Since the 1980s, we’ve enabled purchasers of our standard and custom-made dowel pins to save time and money on an assembly that requires the use of alignment pins.
We offer a complete range of dowel pin manufacturing services – no matter how complex your requirements may be. Our workshop is home to eleven fully automated Escomatic Swiss coil-fed machines, which are designed to produce high-volume runs of dowels, making us competitively priced with exceptional lead times.
Our team are on hand to discuss your unique requirements and deliver pins to your specification, including non-standard diameters and lengths, special threads, and tolerances. We work with a wide range of metals including mild steel, carbon steel, stainless steel and brass, as well as plastics, PTFE, plastic tubing and exotic materials.
If you are looking for high-quality dowel pins, manufactured in the UK by a trusted company, get in touch for a free, no-obligation quote.