BS 1640

INCHES						METRIC
N.B.		O.D. At Bevel				N.B.		O.D. At Bevel
Run	Branch	Run	Branch	Run C	Branch D	Run	Branch	Run	Branch	Run C	Branch D
1 1	¾ ½	1.315 1.315	1.050 0.840	1 ½ 1 ½	1 ½ 1 ½	25 25	20 15	33.40 33.40	26.67 21.34	38.10 38.10	38.10 38.10
1 ¼ 1 ¼ 1 ¼	1 ¾ ½	1.660 1.660 1.660	1.315 1.050 0.840	1 7/8 1 7/8 1 7/8	1 7/8 1 7/8 1 7/8	32 32 32	25 20 15	42.16 42.16 42.16	33.40 26.67 21.34	47.63 47.63 47.63	47.63 47.63 47.63
1 ½ 1 ½ 1 ½ 1 ½	1 ¼ 1 ¾ ½	1.900 1.900 1.900 1.900	1.660 1.315 1.050 0.840	2 ¼ 2 ¼ 2 ¼ 2 ¼	2 ¼ 2 ¼ 2 ¼ 2 ¼	40 40 40 40	32 25 20 15	48.26 48.26 48.26 48.26	42.16 33.40 26.67 21.34	57.15 57.15 57.15 57.15	57.15 57.15 57.15 57.15
2 2 2 2	1 ½ 1 ¼ 1 ¾	2.375 2.375 2.375 2.375	1.900 1.660 1.315 1.050	2 ½ 2 ½ 2 ½ 2 ½	2 3/8 2 ¼ 2 1 ¾	50 50 50 50	40 32 25 20	60.33 60.33 60.33 60.33	48.26 42.16 33.40 26.67	63.50 63.50 63.50 63.50	60.33 57.15 50.80 44.45
2 ½ 2 ½ 2 ½ 2 ½	2 1 ½ 1 ¼ 1	2.875 2.875 2.875 2.875	2.375 1.900 1.660 1.315	3 3 3 3	2 ¾ 2 5/8 2 ½ 2 ¼	65 65 65 65	50 40 32 25	73.03 73.03 73.03 73.03	60.33 48.26 42.16 33.40	76.20 76.20 76.20 76.20	69.85 66.68 63.50 57.15
3 3 3 3	2 ½ 2 1 ½ 1 ¼	3.500 3.500 3.500 3.500	2.875 2.375 1.900 1.660	3 3/8 3 3/8 3 3/8 3 3/8	3 ¼ 3 2 7/8 2 ¾	80 80 80 80	65 50 40 32	88.90 88.90 88.90 88.90	73.03 60.33 48.26 42.16	85.73 85.73 85.73 85.73	82.55 76.20 73.03 69.85
3 ½ 3 ½ 3 ½ 3 ½	3 2 ½ 2 1 ½	4.000 4.000 4.000 4.000	3.500 2.875 2.375 1.900	3 ¾ 3 ¾ 3 ¾ 3 ¾	3 5/8 3 ½ 3 ¼ 3 1/8	90 90 90 90	80 65 50 40	101.60 101.60 101.60 101.60	88.90 73.03 60.33 48.26	95.25 95.25 95.25 95.25	92.08 88.90 82.55 79.38
4 4 4 4 4	3 ½ 3 2 ½ 2 1 ½	4.500 4.500 4.500 4.500 4.500	4.000 3.500 2.875 2.375 1.900	4 1/8 4 1/8 4 1/8 4 1/8 4 1/8	4 3 7/8 3 ¾ 3 ½ 3 3/8	100 100 100 100 100	90 80 65 50 40	114.30 114.30 114.30 114.30 114.30	101.60 88.90 73.03 63.33 48.26	104.78 104.78 104.78 104.78 104.78	101.60 98.43 95.25 88.90 85.73
5 5 5 5 5	4 3 ½ 3 2 ½ 2	5.563 5.563 5.563 5.563 5.563	4.500 4.000 3.500 2.875 2.375	4 7/8 4 7/8 4 7/8 4 7/8 4 7/8	4 5/8 4 ½ 4 3/8 4 ¼ 4 1/8	125 125 125 125 125	100 90 80 65 50	141.30 141.30 141.30 141.30 141.30	114.30 101.60 88.90 73.03 60.33	123.83 123.83 123.83 123.83 123.83	117.48 114.30 111.13 107.95 104.78

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