Also known as / standards: Dowel Pin · Parallel Pin · Straight Pin · DIN 6325 · ISO 2338 · Zylinderstift · DIN 7 · ISO 8734 · ISO2338 · DIN7 · ZYLINDERSTIFTE · JIS B 1354 · JIS B 1355 · CNS 397
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Dowel pins locate two parts to each other with a ground, tightly toleranced diameter. They set position, not clamping force, so diameter tolerance matters far more than length. On German drawings and parts lists the same part is called a Zylinderstift: DIN 7 (ISO 2338) is the unhardened parallel pin, and DIN 6325 (ISO 8734) is the hardened and ground version with an m6 diameter tolerance.
Also known as Dowel Pin · Parallel Pin · Straight Pin · DIN 6325 · ISO 2338 · Zylinderstift · DIN 7 · ISO 8734
Standards ISO 2338 · DIN 7 · ISO 8734 · DIN 6325 · JIS B 1354 · JIS B 1355 · CNS 397 · ASME B18.8.100M
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Zylinderstift is the German word for a dowel pin (parallel pin). It appears on German drawings and bills of material, usually followed by a DIN or ISO number, a diameter with tolerance, a length and a material — for example DIN 7 - 6 m6 x 20 - A2.
DIN 7 was replaced by ISO 2338: unhardened parallel pins in steel or stainless steel. DIN 6325 was replaced by ISO 8734: hardened and ground dowel pins with an m6 diameter tolerance. The old DIN numbers are still widely used on drawings.
Diameter × length in millimetres, with the diameter tolerance in brackets: 6(m6)*20 is a 6 mm pin, m6 tolerance, 20 mm long. Sizes written without a tolerance are our standard slip-fit pins.
An m6 pin is slightly over nominal (a 6 mm m6 pin is +0.004 to +0.012 mm) and presses into an H7 hole to stay put. An h7 pin is at or slightly under nominal (0 to -0.012 mm) and slips into an H7 hole so it can be removed.