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Assembly Instructions for British Standard Pipe
Thread Tapered (BSPT) Connections
1. Inspect components to ensure male and female port
threads are free of rust, splits, dirt, foreign matter, or
burrs.
2. Apply a suitable thread sealant, such as Loctite 567, to
the male pipe threads if not already applied. Ensure the
first 1 to 2 threads are uncovered to prevent system con-
tamination.
3. Assemble connection hand tight.
4. Mark fittings, male and female.
OVER TIGHTENING MAY CAUSE DEFORMATION OF THE PIPE FITTING AND
DAMAGE TO THE JOINING FITTING, FLANGE OR COMPONENT MAY OCCUR.
NEVER BACK OFF (LOOSEN) PIPE THREADED CONNECTORS TO ACHIEVE ALIGN-
MENT. MEET THE MINIMUM REQUIRED TURNS AND USE THE LAST TURN FOR
ALIGNMENT.
* ØA thread dimension for reference only.
** See Appendix B for TFFT procedure requirements.
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SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
Table 5-2. BSPT Pipe Thread
TYPE/FITTING IDENTIFICATION
Thread Size
MATERIAL
Dash Size
(BSPT)
2
1/8 - 28
4
1/4 - 19
6
3/8 - 19
8
1/2 - 14
12
3/4 - 14
16
1 - 11
20
1 1/4 - 11
24
1 1/2 - 11
32
2 - 11
5. Rotate male fitting the number of turns per Table 5-2,
BSPT Pipe Thread. See FFWR and TFFT Methods for TFFT
procedure requirements.
NOTE: TFFT values provided in Table 5-2, BSPT Pipe Thread are
applicable for the following material configurations:
• STEEL fittings with STEEL mating components
• STEEL fittings with ALUMINUM or BRASS mating compo-
nents
• ALUMINUM or BRASS fittings with STEEL mating compo-
nents
• ALUMINUM or BRASS fittings with ALUMINUM or BRASS
mating components.
Turns From
ØA*
Finger Tight
(TFFT)**
(in)
(mm)
0.38
9.73
2 to 3
0.52
13.16
2 to 3
0.66
16.66
2 to 3
0.83
20.96
2 to 3
1.04
26.44
2 to 3
1.31
33.25
1.5 to 2.5
1.65
41.91
1.5 to 2.5
1.88
47.80
1.5 to 2.5
2.35
59.61
1.5 to 2.5
5-7
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