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[7] STAINLESS STEEL 316 THREADED FITTINGS
Specifications
About Stainless Steel
- Stainless steel can be defined as a steel alloy that has a minimum chromium level of 11% of its
mass. Stainless steel fittings are used when the properties of steel and resistance to corrosion are required.
Applications
- Stainless Steel Fittings are most suitable for marine, pumping, commercial, domestic chemical and irrigation
applications.
AAP ‘150lb’ stainless steel fittings are made from grade 316 stainless steel. 150lb refers to the maximum working pressure/
temperature of 150psi saturated steam.
Applicable Standards
AS 1722.2 -
Pipe Threads of Whitworth Form (Fastening thread)
ASTM A351 -
Standard Specification of Castings, Austenitic for pressure-containing parts
ASTM A182 -
Standard Specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and
parts for high temperature parts
ISO 4144 -
Pipework - Stainless Steel fittings Threaded in Accordance with ISO7 - 1
British Standard Threads
All measurements in mm
NOMINAL BORE
OF PIPE
APPROX.
OUTSIDE
DIAMETER
NUMBER OF
THREADS
PER INCH
PITCH
DEPTH OF
THREADS
DIAMETER AT
GAUGE PLANE
LENGTH OF
USEFUL
THREAD
IMPERIAL
METRIC
A
P
h
B
E
1/8
6
10.16
28
0.907
0.581
9.72
6.5
1/4
8
13.66
19
1.337
0.856
13.15
9.7
3/8
10
17.17
19
1.337
0.856
16.66
10.1
1/2
15
21.51
14
1.814
1.162
20.95
13.2
3/4
20
27.00
14
1.814
1.162
26.44
14.5
1
25
33.93
11
2.309
1.479
33.24
16.8
1 1/4
32
42.59
11
2.309
1.479
41.91
19.1
1 1/2
40
48.48
11
2.309
1.479
47.80
19.1
2
50
60.47
11
2.309
1.479
59.61
23.4
2 1/2
65
76.09
11
2.309
1.479
75.18
26.7
3
80
88.87
11
2.309
1.479
87.88
29.8
4
100
114.14
11
2.309
1.479
113.03
35.8
5
125
139.65
11
2.309
1.479
138.43
40.1
6
150
165.12
11
2.309
1.479
163.83
40.1
Mechanical Properties
TENSILE
STRENGTH MIN.
YIELD STRENGTH
MIN.
ELONGATION
MIN.
70000 psi
25000 psi
35%
316/316L Chemical Composition %
C
MAX
Cr
Mn
MAX
Mo
Ni
P
MAX
S
MAX
Si
MAX
0.035 16.0-20.0 2 2.0-3.0 10-15.0 0.04 0.03 0.75
r
r
h
H/6
H/6
H
27.5°
(Pitch p)
r
r
27.5°
H h
(Pitch p)
90°
A
B
F
E
Fig. 1. (Parallel)
H = 0.960491 x p
h = 0.640327 x p
r = 0.137329 x p
Fig. 2. (Taper)
H = 0.960237 x p
h = 0.640327 x p
r = 0.137278 x p
Fig. 3. (Taper)
Axis of screw
Taper 1 in 16 in on dia.
(Shown exaggerated in diagram)
1 3,4,5,6,7,8,9,10,11