Dimensional Tolerances

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  • ASME B16.9
  • MSS SP-43
  • KS/JIS

ASME B16.9

1. Wrought Steel Butt-Welding Fittings

All fittings 90˚and 45˚
Elbows		 Tees Reducers Caps 180˚Returns
Nominal
Pipe Size		 Outside
Diameter
at Bevel
OD		 Inside
Diameter
at End
ID		 Wall
Thickness
T		 Center-
to-End
Dimension
A,B		 Center-
to-End
Dimension
C,M		 End to
End
H		 Back to
Face
E		 Center-
to Center
Dimension
P		 Back to
Face
Dimension
K		 Alignments
of Ends
K
½~2½ +0.06
-0.03		 ±0.03 Not less
than 87½%
of nominal
thickness		 ±0.06 ±0.06 ±0.06 ±0.12 ±0.25 ±0.25 ±0.03
3~4 ±0.06 ±0.06
5~8 ±0.09
-0.06		 ±0.25
10~18 +0.16
-0.12		 ±0.12 ±0.09 ±0.09 ±0.09 ±0.38 ±0.06
20~24 +0.25
-0.19		 ±0.19
26~30 ±0.12 ±0.12 ±0.19 ±0.38 - - -
32~48 ±0.19 ±0.19
asme
Nominal
Pipe Size		 Angularity Tolerance
Off Angle
Q		 Off Plane
P
½ ~ 4 0.03 0.06
5 ~ 8 0.06 0.12
10~12 0.09 0.19
14~16 0.25
18~24 0.12 0.38
26~30 0.19
32~42 0.5
44~48 0.75
* Dimensions are in inches

MSS SP-43

Nominal
Pipe Size		 All Fittings 90˚Elbow
45˚Elbow
Tee		 Reducer
Lap Joint
Stub End		 180˚Return
Outside(1)
Diameter at
Welding End		 Wall
Thickness		 Center-to-end
Dimension
A,B,C,M		 Overall
Length
F,H		 Center-to
-Center
Dimension
O		 Center-to
-Center
Dimension
K		 AlignMent
of Ends
U
½ ~ 1½ ±0.03 Not less
than 87½%
of nominal
thickness		 ±0.06 ±0.06 ±0.25 ±0.25 ±0.03
2 ~ 3½ ±0.03 ±0.06 ±0.06 ±0.25 ±0.25 ±0.03
4 ±0.03 ±0.06 ±0.06 ±0.25 ±0.25 ±0.03
5 ~ 8 +0.06
-0.03		 ±0.06 ±0.06 ±0.25 ±0.25 ±0.03
10~18 +0.09
-0.03		 ±0.09 ±0.09 ±0.38 ±0.25 ±0.06
20~24 +0.12
-0.03		 ±0.09 ±0.09 ±0.38 ±0.25 ±0.06
Nominal
Pipe Size		 All Fittings Cap Lap Joint Stub End
Outside(1)
Diameter at
Welding End		 Wall
Thickness		 Overall
Length E		 Fillte(2)
Radius Of
Lap A		 Outside
Diameter of
Lap G
½ ~ 1½ ±0.03 Not less
than 87½%
of nominal
thickness		 ±0.12 +0
-0.03		 +0
-0.03
2 ~ 3½ ±0.03 ±0.12 +0
-0.03		 +0
-0.03
4 ±0.03 ±0.12 -0.06 +0
-0.03
5 ~ 8 +0.06
-0.03		 ±0.25 -0.06 +0
-0.03
10~18 +0.09
-0.03		 ±0.25 -0.06 +0
-0.06
20~24 +0.12
-0.03		 ±0.25 -0.06 +0
-0.06

· Dimensions are in inches.

Notes

1.Out of roundness is the vector sum of the plus and minus tolerance.
2. Fillet B radius is the maximum.

KS / JIS

1. Steel Butt-Welding Pipe Fittings for Ordinary Use [KS B 1522 / JIS B 2311]

Item Type of
Pipe Fitting		 Nominal Diameter
½ ~ 2½ 3 ~ 4 5 ~ 8 10~18 20
Tolerance
Outside Dia, at end face (OD) All pipe
Fittings		 ±2 ±2.5 ±3.5 +5
-4.5		 +6.4
-4.8
Inside Dia, at end face (ID) ±2 ±2.5 ±3.5 ±4.5 ±4.8
Wall thickness(T) +Not specified
-15%
Center-to-end dimension (A,B) 90˚Elbow
45˚Elbow		 ±2.0 ±3.2 ±4.8
Center-to-center dimension (P) 180˚Elbow ±6.4 ±9.5 -
Back-to-face dimension (K) ±6.4 -
Alignment of ends(Max) (U) 1.6 3.2 -
End-to-end dimension (H) Reducer ±2.0 ±3.2
Center-to-end dimension (C.M) Tee ±2.0 ±3.2
Back-to-face dimension (E) CAP ±3.2 ±6.4

2. Steel Butt-Welding Pipe Fittings for Special Use and Steel Plate Butt-Welding Pipe Fittings
[KS B 1541 / JIS B 2312 / KS B 1543 / JIS B 2313]

Item Type of
Pipe Fitting		 Nominal Diameter
½ ~ 2½ 3 ~ 4 5 ~ 8 10~18 20~24 26~30 32~26
Tolerance
Outside Dia,at end face (OD) All pipe
Fittings		 +1.6
-0.8		 ±1.6 +2.4
-1.6		 +4
-3.2		 +6.4
-4.8
Inside Dia,at end face(ID) ±0.8 ±1.6 ±3.2 ±4.8
Wall thickness (T) +Not specified
-12.5%
Center-to-end dimension (A.B) 90˚Elbow
45˚Elbow		 ±1.6 ±2.4 ±3.2 ±4.8
Center-to-center dimension (P) 180˚Elbow ±6.4 ±9.5
Back-to-face dimension (K) ±6.4
Alignment of ends(Max) (U) * ±0.8
** ±1.6		 * ±1.6
** ±3.2
End-to-end dimension (H) Reducer ±1.6 ±2.4 ±4.8
Center-to-end dimension (C.M) Tee ±1.6 ±2.4 ±3.2 ±4.8
Outside of end Peripheral length All pipe Fittings - ±0.5

* Application of KS B 1541, JIS B 2312
* Application of KS B 1543, JIS B 2313
· Dimesions are in millimeters.

3. Steel Socket-Welding Pipe Fittings for Special [KS B 1542 / JIS B 2316]

Item Type of
Pipe Fitting		 Nominal Diameter
⅛ and ¼ ⅜ and ¾ 1 to 2 2½ and 3
Tolerance
Inside Diameter of socket All pipe
Fittings		 +0.3
0		 +0.4
0
Bore diameter ±0.4 ±0.8
Eccentricity of inside diameter
of socket to bore diameter		 ±0.8
Inclination of socket hole
to fitting bore axis		 1.5/300 Max.
Distance from center to
bottom of socket		 45˚Elbow
90˚Elbow cross		 ±0.8 ±1.5 ±2 ±2.5
Laying length Full coupling ±1.5 ±3 ±4 ±5
Laying length Half coupling ±0.8 ±1.5 ±2 ±2.5

4. Right Angle for Shaft-Center of Pipe Fittings
[KS B 1522 / JIS B 2311 / KS B 1541 / JIS B 2312 / KS B 1543 / JIS B 2313]

Item Type of
Pipe Fitting		 Nominal Diameter
½ ~ 4 5 ~ 8 10~12 14~16 18~24 26~30 32~42 44~48
Tolerance
Off Angle (X) All pipe
Fittings		 0.8 1.6 2.4 3.2 4.8
Off Plane (Y) 1.6 3.2 4.8 6.4 9.5 12.7 19.1
* Dimensions are in millimeters.