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Fittings Guide

Dimensions Butt Weld Caps NPS 1/2 - 48 ASME B16.9

CAP ASME B.16.9
NPS O.D.
D
LENGTH
H
LENGTH
H1
1/2 21.3 25 25
3/4 26.7 25 25
1 33.4 38 38
1.1/4 42.2 38 38
1.1/2 48.3 38 38
2 60.3 38 44
2.1/2 73 38 51
3 88.9 51 64
3.1/2 101.6 64 76
4 114.3 64 76
5 141.3 76 89
6 168.3 89 102
8 219.1 102 127
10 273 127 152
12 323.8 152 178
14 355.6 165 191
16 406.4 178 203
CAP ASME B.16.9
NPS O.D.
D
LENGTH
H
LENGTH
H1
18 457 203 229
20 508 229 254
22 559 254 254
24 610 267 305
26 660 267  
28 711 267  
30 762 267  
32 813 267  
34 864 237  
36 914 267  
38 965 305  
40 1016 305  
42 1067 305  
44 1118 343  
46 1168 343  
48 1219 343  
NPS O.D.
D
LENGTH
H
LENGTH
H1
General notes:
  • Dimensions are in millimeters unless otherwise indicated.
  • Wall thickness (t) must be specified by customer.
  • The shape shall be ellipsoidal and shall conform to the requirements given in the ASME Boiler and Pressure Vessel Code.
  • Length (H) applies for thickness not exceeding that given in column "Wall Thickness" for Length, H.
  • Length (H1) applies for thickness greater than that given in column "Wall Thickness" for NPS 24 and smaller. For NPS 26 and larger, length H1 shall be by agreement between the manufacturerand purchaser.

Dimensional Tolerances of End Caps ASME B16.9

Nominal Pipe Size 1/2 to 2.1/2 3 to 3.1/2 4 5 to 8
Outside Diameter
at Bevel (D)
+ 1.6
- 0.8
1.6 1.6 + 2.4
- 1.6
Inside Diameter at End 0.8 1.6 1.6 1.6
Overall Length (H) 3 3 3 6
Nominal Pipe Size 10 to 18 20 to 24 26 to 30 32 to 48
Outside Diameter
at Bevel (D)
+ 4
- 3.2
+ 6.4
- 4.8
+ 6.4
- 4.8
+ 6.4
- 4.8
Inside Diameter at End 3.2 4.8 + 6.4
- 4.8
+ 6.4
- 4.8
Overall Length (H) 6 6 10 10
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted.

Note:
MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 - NPS 24. Except with regard to the outside diameter at the bevel.

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Weights of Buttweld Caps

SCHEDULE STD XS 160 XXS

Weights, Dimensions of Butt Weld End Caps
NPS STD XS SCH 160 XXS
1 0.09 0.14 0.18 0.23
1.1/4 0.14 0.18 0.23 0.34
1.1/2 0.18 0.23 0.27 0.41
2 0.27 0.34 0.57 0.68
2.1/2 0.41 0.45 0.79 1.13
3 0.68 0.79 1.32 1.81
3.1/2 0.91 1.13 - 2.72
4 1.13 1.36 2.68 3.4
5 2.04 2.49 4.54 5.44
6 2.95 4.08 6.8 8.16
8 5.44 7.26 14.06 13.61
10 9.07 11.34 25.85 -
12 13.61 16.33 43.09 -
14 16.33 20.41 - -
16 18.14 24.49 - -
18 24.49 32.66 - -
20 34.02 39.01 - -
22 42.64 56.7 - -
24 43.54 58.97 - -
26 53.98 72.12 - -
30 78.02 103.87 - -
NPS STD XS SCH 160 XXS

Note:

Buttweld Fitting Weights

ASME buttweld fitting specifications do not specify weights for fittings. Weights quoted in the table on this page are based on manufacturers information and should be considered as approximate and provided as a guide only (fitting weights can vary considerably between manufacturers due to differences in construction).

Weights in these tables are taken from Hackney Ladish, Inc.

Hackney Ladish

Hackney Ladish, Inc. is one of the largest and most versatile fitting producers in the world. Hackney Ladish, Inc. is headquartered in Dallas, TX and operates 2 facilities containing 380,000 square feet of manufacturing.

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