Longer answers about crimp terminals, heat shrink and boat wiring, with the federal rules behind them quoted word for word.
Learning Center
Three kinds of crimp terminal cover almost every stranded wire in a panel, a car or a battery box. The wire gauge picks the size. The thing it connects to picks the kind.
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The number on a heat shrink pack is the size before you heat it. The ratio tells you the size after. Get both right and the tube slides on easily and still closes tight.
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Boat wiring lives with vibration, salt and damp. The federal rules for boat builders are short and practical, and three of them decide most of what goes on the end of a cable.
Read the guideWorked out from our range, with links to every pack.
| Wire | mm² | Per piece |
|---|---|---|
| 24 AWG | 0.34 mm² | $0.010 |
| 22 AWG | 0.5 mm² | $0.009 |
| 20 AWG | 0.75 mm² | $0.008 |
| 18 AWG | 1.0 mm² | $0.008 |
| 16 AWG | 1.5 mm² | $0.010 |
| 14 AWG | 2.5 mm² | $0.010 |
| Size | Ratio | Shrinks to |
|---|---|---|
| 1/16 in | 2:1 | 1/32 in |
| 1/8 in | 3:1 | 3/64 in |
| 1/4 in | 3:1 | 5/64 in |
| 1/2 in | 3:1 | 11/64 in |
| 1 in | 2:1 | 1/2 in |
| 1-1/2 in | 2:1 | 3/4 in |
| Thread | Cable range |
|---|---|
| NPT 1/4 in | 0.16 to 0.31 in |
| NPT 3/8 in | 0.19 to 0.39 in |
| NPT 1/2 in | 0.23 to 0.49 in |
| NPT 3/4 in | 0.49 to 0.70 in |
| NPT 1 in | 0.66 to 0.98 in |
