Alco-Lok fittings are made from 316/316L stainless steel with silver plating on the internal nut threads. Stud sizes 1/16” to 1” NPT/BSPT threads are standard. Other materials and connections are available on request.
Bulkhead Unions
Metric Dimensions (mm)
| T o/d | L1 | C | D | F | G | H | J | L | Panel Hole | Max |
| 6 | 61 | 19 | 17 | 17 | 14 | 43 | 35 | 26 | 11.6 | 12 |
| 8 | 64 | 20 | 18 | 17 | 17 | 46 | 37.5 | 28.5 | 13.2 | 14 |
| 10 | 65 | 20.5 | 18 | 19 | 19 | 48 | 38 | 29.5 | 16.4 | 10 |
| 12 | 73 | 23 | 24 | 24 | 22 | 51 | 43 | 32 | 19.5 | 1.4 |
| 16 | 76.5 | 24 | 26 | 27 | 27 | 52.5 | 44.5 | 32.5 | 22.7 | 14 |
| 18 | 83 | 24 | 26 | 30 | 30 | 59 | 49.5 | 37.5 | 25.9 | 18 |
| 25 | 105 | 31 | 36 | 41 | 41 | 72 | 62 | 45.5 | 33.8 | 27 |
Imperial Dimensions (inch)
| T o/d | L1 | C | D | F | G | H | J | L | Panel Hole | Max |
| 1/8 | 2.1 | 0.63 | 0.53 | 1/2 | 7/16 | 1.57 | 1.25 | 0.97 | 21/64 | 0.4 |
| 1/4 | 2.27 | 0.7 | 0.6 | 5/8 | 9/16 | 1.69 | 1.32 | 1.03 | 29/64 | 0.4 |
| 5/16 | 2.39 | 0.73 | 0.64 | 11/16 | 5/8 | 1.81 | 1.41 | 1.12 | 33/64 | 0.5 |
| 3/8 | 2.46 | 0.76 | 0.66 | 3/4 | 11/16 | 1.88 | 1.45 | 1.16 | 37/64 | 0.4 |
| 1/2 | 2.8 | 0.86 | 0.9 | 15/16 | 7/8 | 2 | 1.65 | 1.25 | 49.64 | 0.5 |
| 5/8 | 2.87 | 0.86 | 0.96 | 1 | 1 | 2.06 | 1.69 | 1.28 | 57/64 | 0.5 |
| 3/4 | 3.11 | 0.86 | 0.96 | 13/16 | 1-1/8 | 2.31 | 1.87 | 1.47 | 1.1/16 | 0.67 |
| 1 | 3.75 | 1.04 | 1.23 | 1-5/8 | 1-1/2 | 2.81 | 2.26 | 1.78 | 1-21/64 | 0.88 |
Adapter
Alco-Lok Accessories
Bulkhead ConnectorsBulkhead Unions
Close Nipple
Coupling
Gauge Adapter
Hex Female Cap 
Hex Male Plug