1-3/4-4 ACME thread: 44.45 mm × 4 TPI
Threads › 1-3/4-4 ACME
1-3/4-4 ACME is an Acme thread: 44.45 mm major diameter, 4 TPI (6.35 mm pitch), 29° form.
| Standard | Acme |
|---|---|
| Major diameter | 44.45 mm (1.75″) |
| Pitch | 4 TPI (6.35 mm) |
| Thread angle | 29° |
| Minor diameter, bolt | 37.59 mm |
| Minor diameter, nut | 37.59 mm |
| Tap drill | Not listed. Check your tap maker's chart. |
Minor diameters worked out from the basic profile: major Ø − pitch − 0.508 mm.
Open 1-3/4-4 ACME in BenchsmithAdd to order list
Measure it
Bolt: Measure across the crests of the bolt with the caliper jaws. Worn bolts read 0.1 to 0.3 under.
Nut or tapped hole: Measure across the tops of the threads inside the nut or hole with the inside jaws. That is the minor Ø. Worn or oversize holes read a little over.
Close in size, won't mate
- 1-3/4-5 UNCØ44.45 mm, 5 TPI
- Tr44×7Ø44 mm, 7 mm pitch
- M45Ø45 mm, 4.5 mm pitch
- M45×3Ø45 mm, 3 mm pitch
One size up or down
- 1-1/2-4 ACMEØ38.1 mm (down)
- 2-4 ACMEØ50.8 mm (up)
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.