7/16 BSW thread: 11.11 mm × 14 TPI

Threads › 7/16 BSW

7/16 BSW is a BSW Whitworth thread: 11.11 mm major diameter, 14 TPI (1.814 mm pitch), 55° form. Tap drill 9.3 mm.

Minor diameters worked out from the basic profile: major Ø − 1.28065 × pitch.

Open 7/16 BSW 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.

Same diameter, other pitch

• 7/16-14 UNC14 TPI (1.814 mm pitch)
• 7/16-20 UNF20 TPI (1.27 mm pitch)

Close in size, won't mate

• 7/16-12 ACMEØ11.11 mm, 12 TPI
• 1/8-27 NPTØ10.29 mm, 27 TPI
• M12Ø12 mm, 1.75 mm pitch
• M12×1.5Ø12 mm, 1.5 mm pitch
• M12×1.25Ø12 mm, 1.25 mm pitch
• Tr12×3Ø12 mm, 3 mm pitch

One size up or down

• 3/8 BSWØ9.52 mm (down)
• 1/2 BSWØ12.7 mm (up)

Got a bolt and no idea what it is? Measure the outside Ø and type it into Benchsmith → Find → Thread.