Dowel Pins
Precision ground pins for location and alignment.
Standard and oversize dowels ground to tight diameter tolerance, in alloy and stainless.
Specifications & technical data.
Precision dowel pins to ASME B18.8.2 — standard and oversize series, ground to tenths, with chamfered point and crowned end.
Download our dowel pin dimensioning table (PDF)
| Nominal Size | A — Standard Series Pin Diameter | B — Oversize Series Pin Diameter | Point Diameter | C — Max. Crown Height | R — Min. Crown Radius | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Max. | Min. | Basic | Max. | Min. | Max. | Min. | ||||
| 1/16" | 0.0625 | 0.0627 | 0.0628 | 0.0626 | 0.0635 | 0.0636 | 0.0634 | 0.058 | 0.048 | 0.020 | 0.008 |
| 5/64" | 0.0781 | 0.0783 | 0.0784 | 0.0782 | 0.0791 | 0.0792 | 0.0790 | 0.074 | 0.064 | 0.026 | 0.010 |
| 3/32" | 0.0938 | 0.0940 | 0.0941 | 0.0939 | 0.0948 | 0.0949 | 0.0947 | 0.089 | 0.079 | 0.031 | 0.012 |
| 1/8" | 0.1250 | 0.1252 | 0.1253 | 0.1251 | 0.1260 | 0.1261 | 0.1259 | 0.120 | 0.110 | 0.041 | 0.016 |
| 5/32" | 0.1562 | 0.1564 | 0.1565 | 0.1563 | 0.1572 | 0.1573 | 0.1571 | 0.150 | 0.140 | 0.052 | 0.020 |
| 3/16" | 0.1875 | 0.1877 | 0.1878 | 0.1876 | 0.1885 | 0.1886 | 0.1884 | 0.180 | 0.170 | 0.062 | 0.023 |
| 1/4" | 0.2500 | 0.2502 | 0.2503 | 0.2501 | 0.2510 | 0.2511 | 0.2509 | 0.240 | 0.230 | 0.083 | 0.031 |
| 5/16" | 0.3125 | 0.3127 | 0.3128 | 0.3126 | 0.3135 | 0.3136 | 0.3134 | 0.302 | 0.290 | 0.104 | 0.039 |
| 3/8" | 0.3750 | 0.3752 | 0.3753 | 0.3751 | 0.3760 | 0.3761 | 0.3759 | 0.365 | 0.350 | 0.125 | 0.047 |
| 7/16" | 0.4375 | 0.4377 | 0.4378 | 0.4376 | 0.4385 | 0.4386 | 0.4384 | 0.424 | 0.409 | 0.146 | 0.055 |
| 1/2" | 0.5000 | 0.5002 | 0.5003 | 0.5001 | 0.5010 | 0.5011 | 0.5009 | 0.486 | 0.471 | 0.167 | 0.063 |
| 5/8" | 0.6250 | 0.6252 | 0.6253 | 0.6251 | 0.6260 | 0.6261 | 0.6259 | 0.611 | 0.595 | 0.208 | 0.078 |
| 3/4" | 0.7500 | 0.7502 | 0.7503 | 0.7501 | 0.7510 | 0.7511 | 0.7509 | 0.735 | 0.715 | 0.250 | 0.094 |
| 7/8" | 0.8750 | 0.8752 | 0.8753 | 0.8751 | 0.8760 | 0.8761 | 0.8759 | 0.860 | 0.840 | 0.293 | 0.109 |
| 1" | 1.0000 | 1.0002 | 1.0003 | 1.0001 | 1.0010 | 1.0011 | 1.0009 | 0.980 | 0.960 | 0.333 | 0.125 |
All dimensions in inches, per ASME B18.8.2-2020. Standard series for new work; oversize series for repair of worn holes. Confirm requirements with our estimating team.
Standards.
What are dowel pins?
Dowel pins are precision-ground cylinders that locate one component against another — they carry shear and fix alignment where a bolt only clamps. Ground diameters run tenths of a thousandth of tolerance; the chamfered point starts the pin, the crowned end takes the press.
- Ground to 0.0001″-class tolerances
- Standard series for new work, oversize for repair
- Chamfered point, crowned end
- Alloy, stainless and exotic materials
Other names
- Straight pins
- Precision pins
- Locating pins
- Press-fit dowels
Tips for purchasing
- Pick standard or oversize by the hole — oversize rescues a worn or re-reamed bore.
- Specify the fit — press or slip — and we grind to suit.
- Stainless dowels for corrosion service; through-hardened alloy for shear.
- Certs available on request.
Materials.
Representative capabilities — every item is manufactured or certified to your specification. Confirm requirements with our estimating team.
