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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					±0.12
5~8	±0.09 -0.06	±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		±0.09	±0.09	±0.09		±0.38		±0.06
26~30				±0.12	±0.12	±0.19	±0.38	-	-	-
32~48				±0.19	±0.19	±0.19	±0.38	-	-	-

* Dimensions are in inches

Nominal Pipe Size	All Fittings		90˚Elbow 45˚Elbow Tee	Reducer Lap Joint Stub End	180˚Return
Nominal Pipe Size	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
Nominal Pipe Size	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.

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

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]

* Dimensions are in millimeters.