[[TitleIndustry]]

How to machine / measure BSP fittings

Date:Aug 27, 2019

BSP fittings is produce by CNC machine, the material of BSP pipe fittings is carbon steel and 316 or 304 stainless steel. UK industrial machines and equipment are designed and manufactured with BSP types of fittings and adaptors, with different sealing methods for hydraulic systems.

 

There are two types of BSP threads commonly used on hydraulic fitting

BSPP (BSP, Parallel)

BSPT (BSP, Tapered)

 

BSPP thread two sealing methods as follows:

Male BSPP 60 deg cone tube connector

Female BSPP swivel 60 deg seat connector

BSPP thread flat face port with ED seal, bonded seal, o-ring + retaining ring and cutting edge face

CNC produce BSP end in one time with eight tool, steps as follow:

1. Drilling hole for fluid power passage.

2. CNC turning 60 cone for metal or metal+o ring double sealing

3. CNC turning BSPP thread for tightening and clamping the contact.

4. Undercut the chamfer

 

Measure BSP thread fittings steps is as follow:

1. Determine BSPP thread or BSPT thread, by visual inspection for parallel or tapered thread.

2. Determine BSP thread pitch, by Go and NO-GO gauge for checking thread pitches fit.

3. Determine the size of BSP thread, by measuring the actual outside diameter of pipe thread with caliper.

4. Designate BSP thread size by table BS 5200 standard.

Nominal Size
(inches)

T P I

Major Diameter
(inches)

Tapping Drill Size

Tapping Drill Size

BSP

BSPT




1/16

28

0.304

6.6 mm


Letter drill G





1/8

28

0.383

8.8 mm

8.4mm

11/32 inch

21/64"




1/4

19

0.518

11.8 mm

11.2mm

29/64"

7/16"




3/8

19

0.656

15.25 mm

14.75mm

19/32"

37/64"




1/2

14

0.825

19.00mm

18.25mm


3/4"

23/32"




5/8

14

0.902

21 mm


53/64"





3/4

14

1.041

24.5 mm

23.75mm

31/32"

15/16"




7/8

14

1.189

28.25 mm


 1-7/64"





1 inch

11

1.309

30.75 mm

30mm

 1-13/64"

1-11/64"




 1-1/4"

11

 1.650

 39.50 mm

38.5mm

 1-35/64"

1-33/64"




 1-1/2"

11

1.882

45.5 mm

44.5mm

 1-25/32"

1-3/4"




1-3/4"

11

2.116

51.00 mm


 2"





2"

11

2.347

57 mm

56mm

 2-1/4"

2-3/16"




 

 


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