Tr28×5 thread: 28 × 5 mm
Threads › Tr28×5
Tr28×5 is a Trapezoidal (Tr) thread: 28 mm major diameter, 5 mm pitch, 30° form.
| Standard | Trapezoidal (Tr) |
|---|---|
| Major diameter | 28 mm |
| Pitch | 5 mm |
| Thread angle | 30° |
| Minor diameter, bolt | 22.5 mm |
| Minor diameter, nut | 23 mm |
| Tap drill | Not listed. Check your tap maker's chart. |
| Usual class | 7e bolt, 7H nut |
Minor diameters worked out from the basic profile: major Ø − pitch − 0.5 mm (bolt) and major Ø − pitch (nut).
Open Tr28×5 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
- 1-1/8-7 UNCØ28.58 mm, 7 TPI
- 1-1/8-12 UNFØ28.58 mm, 12 TPI
- M27Ø27 mm, 3 mm pitch
- M27×2Ø27 mm, 2 mm pitch
One size up or down
Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.