Identifying Threads
PDF Download: Identifying Threads
| Thread Type | Step 1 Determine Type |
Step 2 Determine Pitch |
Step 3 Determine Size |
Step 4 Define Thread |
| UN/UNF (SAE) |
Parallel | 12, 14, 16, 18, 20, 24 | Measure with caliper | Size-pitch, type (3/4-16 (UN/UNF) |
| NPT/NPTF (American Pipe) |
Tapered | 11.5, 14, 18, 27 | Compare with profile | Size-pitch, typeM (1/4-18 NPT) |
| BSPP (British Pipe) |
Parallel | 11, 14, 19, 28 | Compare with profile | G, size (G1/8) |
| BSPT (British Pipe) |
Tapered | 11, 14, 19, 28 | Compare with profile | R, size (R1/2) |
| Metric (Parallel) |
Parallel | 1.0, 1.5, 2.0 | Measure with caliper | M, size x pitch (M14x1.5) |
| Metric (Tapered) |
Tapered | 1.0, 1.5, 2.0 | Measure with caliper | M, size x pitch, keg or Taper (M10 x 1 keg or Taper) |