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BS 1640

INCHES					METRIC
N.B.		O.D. At Bevel		H	N.B.		O.D. At Bevel		H
L.E.	S.E.	L.E.	S.E.		L.E.	S.E.	L.E.	S.E.
¾	½	1.05	0.84	2	20	15	26.67	21.34	50.8
1 1	¾ ½	1.315 1.315	1.050 0.840	2 2	25 25	20 15	33.40 33.40	26.67 21.34	50.80 50.80
1 ¼ 1 ¼ 1 ¼	1 ¾ ½	1.660 1.660 1.660	1.315 1.050 0.840	2 2 2	32 32 32	25 20 15	42.16 42.16 42.16	33.40 26.67 21.34	50.80 50.80 50.80
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 ½ 2 ½ 2 ½ 2 ½	40 40 40 40	32 25 20 15	48.26 48.26 48.26 48.26	42.16 33.40 26.67 21.34	63.50 63.50 63.50 63.50
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	3 3 3 3	50 50 50 50	40 32 25 20	60.33 60.33 60.33 60.33	48.26 42.16 33.40 26.67	76.20 76.20 76.20 76.20
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 ½ 3 ½ 3 ½ 3 ½	65 65 65 65	50 40 32 25	73.03 73.03 73.03 73.03	60.33 48.26 42.16 33.40	88.90 88.90 88.90 88.90
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 ½ 3 ½ 3 ½ 3 ½	80 80 80 80	65 50 40 32	88.90 88.90 88.90 88.90	73.03 60.33 48.26 42.16	88.90 88.90 88.90 88.90
3 ½ 3 ½ 3 ½ 3 ½ 3 ½	3 2 ½ 2 1 ½ 1 ¼	4.000 4.000 4.000 4.000 4.000	3.500 2.875 2.375 1.900 1.660	4 4 4 4 4	90 90 90 90 90	80 65 50 40 32	101.60 101.60 101.60 101.60 101.60	88.90 73.03 60.33 48.26 42.16	101.60 101.60 101.60 101.60 101.60

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