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What is the drill size for 1/4 BSP?

Kobe Glover

What is the drill size for 1/4 BSP?

BSPP / BSPT

SIZE TPI TAP DRILL
1/8″ 28 8.70
1/4″ 19 11.60
3/8″ 19 15.00
1/2″ 14 19.00

What is the diameter of 1 BSP?

Just to confuse you, we generally refer to a fitting by size, a 1” BSP nipple is also known as a 25mm BSP nipple but this actually refers to the inside diameter. The outside diameter for a 1” BSP fitting is not 1” or 25mm it is in fact 33.249mm at the widest point.

What drill size do I need for 1/4 NPT?

NPT Tap Drill Chart

Tap Size Drill Size Tap and Drill Set
1/4″ NPT Tap 7/16″ Drill Bit 1/4″ NPT Tap and Drill Set
3/8″ NPT Tap 37/64″ Drill Bit 3/8″ NPT Tap and Drill Set
1/2″ NPT Tap 23/32″ Drill Bit 1/2″ NPT Tap and Drill Set
3/4″ NPT Tap 59/64″ Drill Bit 3/4″ NPT Tap and Drill Set

What is the outside diameter of 1/4 BSP thread?

British Standard Pipe Thread (BSPT)

BSP Thread Size Outside Diameter mm / inch TPI
1/4 Inch BSP 13.16 mm / 0.518″ 19
3/8 Inch BSP 16.66 mm / 0.656″ 19
1/2 Inch BSP 20.99 mm / 0.825″ 14
5/8 Inch BSP 22.99 mm / 0.902″ 14

Is 1/2 inch BSP the same as 15mm?

1/2″ pipe refers to the internal diameter, 15mm pipe is the external diameter… In my experience they are so similar that you can even use solder fittings without a worry, so using 15mm olives on 12″ pipe isn’t a problem. Occasionally they are very marginally tight, but not enough to be an issue.

What is the diameter of 1/2 BSP?

British Standard Pipe Thread (BSPT)

BSP Thread Size Outside Diameter mm / inch TPI
1/2 Inch BSP 20.99 mm / 0.825″ 14
5/8 Inch BSP 22.99 mm / 0.902″ 14
3/4 Inch BSP 26.44 mm / 1.041″ 14
7/8 Inch BSP 30.20 mm / 1.189″ 14

What size hole do you drill for quarter inch NPT?

Tap size Threads per inch Drill size w/ taper pipe reamer
1/4 18 27/64
3/8 18 9/16
1/2 14 11/16
3/4 14 57/64

What is the outside diameter of 1/2 BSP thread?