Mil-Spec, Metric & US (Inch) Dowel Pins
Dowel pins are short cylindrical rods made of metal, and are used to align and/or join components in machinery. A steel dowel pin helps align machine components during the assembly process to ensure a consistent result. Dowel pins can be tapered, slotted, grooved, or otherwise altered to change its mechanical properties.
Steel dowel pins are machined to tight tolerances, as are the corresponding holes, which are typically reamed. US dowel pins may have a smaller diameter than its hole so that it slips in freely. Some dowel pins have a larger diameter so that they must be pressed into its corresponding hole (interference fit).
Designers will use dowel holes as reference points to control variation and to create a repeatable assembly. If dowels are not used for alignment (e.g., components are only bolted together), there can be significant variation in component alignment.
Bayou City Bolt has US, Metric & Mil-Spec Dowel Pins in stock and ready to ship.
| Dimensions of Hardened Ground Machine Dowl Pins | ||||||
| Nominal Pin Diameter | Pin Diameter | |||||
| Standard Series Pins | Oversize Series Pins | |||||
| Basic | Max | Min | Basic | Min | Max | |
| 1/16 (0.0625) | 0.0627 | 0.0628 | 0.0626 | 0.0635 | 0.0636 | 0.0634 |
| 3/32 (0.0938) | 0.094 | 0.0941 | 0.0941 | 0.0948 | 0.0949 | 0.0947 |
| 1/8 (0.1250) | 0.1252 | 0.1253 | 0.1253 | 0.126 | 0.1261 | 0.1259 |
| 3/16 (0.1875) | 0.1877 | 0.1878 | 0.1878 | 0.1885 | 0.1886 | 0.1884 |
| 1/4 (0.2500) | 0.2502 | 0.2503 | 0.2503 | 0.251 | 0.2511 | 0.2509 |
| 5/16 (0.3125) | 0.3127 | 0.3128 | 0.3128 | 0.3135 | 0.3136 | 0.3134 |
| 3/8 (0.3750) | 0.3752 | 0.3753 | 0.3753 | 0.376 | 0.3761 | 0.3759 |
| 7/16 (0.4375 | 0.4377 | 0.4378 | 0.4378 | 0.4385 | 0.4386 | 0.4384 |
| 1/2 (0.5000) | 0.5002 | 0.5003 | 0.5003 | 0.501 | 0.5011 | 0.509 |
| 5/8 (0.6250) | 0.6252 | 0.6253 | 0.6253 | 0.6251 | 0.626 | 0.6261 |
| 3/4 (0.7500) | 0.7502 | 0.7503 | 0.7503 | 0.751 | 0.7511 | 0.7509 |
| 7/8 (0.8750) | 0.8752 | 0.8753 | 0.8753 | 0.876 | 0.8761 | 0.8459 |
| 1 (1.000) | 1.0002 | 1.0003 | 1.0003 | 1.001 | 1.0011 | 1.0009 |
| Nominal Pin Size | Suggested hole Diameter for Standard Series Pins | Single Shear Load For Carbon or Alloy Steel | |
| Max | Min | Calculated, lb | |
| 1/16 | 0.0625 | 0.0620 | 400.0000 |
| 3/32 | 0.0781 | 0.0932 | 900.0000 |
| 1/18 | 0.1250 | 0.1245 | 1,600.0000 |
| 3/16 | 0.1875 | 0.1870 | 3,600.0000 |
| 1/4 | 0.2500 | 0.2495 | 6,400.0000 |
| 5/16 | 0.3125 | 0.3120 | 10,000.0000 |
| 3/8 | 0.3750 | 0.3745 | 14,350.0000 |
| 7/16 | 0.4375 | 0.4370 | 19,550.0000 |
| 1/2 | 0.5000 | 0.4995 | 25,500.0000 |
| 5/8 | 0.6250 | 0.6245 | 39,900.0000 |
| 3/4 | 0.7500 | 0.7495 | 57,000.0000 |
| 7/8 | 0.8750 | 0.8745 | 78,000.0000 |
| 1.000 | 1.0000 | 0.9995 | 102,000.0000 |