DIN 6325 Hardened & Ground Dowel Pins (ISO 8734)
We supply DIN 6325 hardened and ground dowel pins for precision location work, available across a range of metric sizes - diameters run from 1mm to 25mm with lengths to 120mm. The pin body is through-hardened and ground to an m6 diameter tolerance, giving a repeatable press fit in an accurately prepared hole.
Also known as: hardened dowel pin, ground dowel pin, precision dowel pin, parallel dowel pin, location dowel, iso 8734, din 6325.
Materials & strength
Through-hardened and ground
The pin is hardened through its section and finish-ground to an m6 diameter tolerance, so location accuracy is held from the first assembly through repeated strip-downs.
Precision location
Dowel pins hold two or more components in fixed relative positions. Because the pin and its reamed hole are both precisely sized, an assembly can be taken apart and re-made with its original register intact.
Chamfered ends
Ends are chamfered or domed to lead the pin into its hole during pressing.
Blind hole fitting
Driving a dowel into a blind interference hole traps air behind it, which can push the pin back out in service. On larger diameters an air-release flat can be specified for blind-hole work.
Related specificationsWhat is the difference between DIN 6325 and DIN 7 dowel pins?
DIN 6325 pins are through-hardened for wear resistance and higher shear duty; DIN 7 covers unhardened dowels for lighter location work and softer host materials. Both are ground parallel pins fitted into prepared holes.
Is DIN 6325 the same as ISO 8734?
The two designations cover the same product - a hardened, ground parallel dowel pin - and are specified interchangeably for most work. Check the drawing callout where the tolerance class is critical.
What hole preparation do hardened dowels need?
The fit class is determined by the tolerance classes of both the pin and the mating hole — the pin's m6 tolerance and the hole's H7 (or similar) tolerance together define the degree of interference. Ream the hole to the nominal diameter and the m6 pin provides the interference.
Can a hardened dowel be removed from a blind hole?
A plain dowel in a blind hole is difficult to extract because there is no way to drive it through. Where strip-down is expected, an extractable dowel pin with an internal thread (DIN 7979) is the usual answer.
Need DIN 6325 (ISO 8734) in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.