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C.E.I.-Thread

Cycle Engineer Institution Thread, used in the British bicycle industry. Smetimes the name "BSC" or "BSCy" is used. This series replaced the Cycle Engineers Institute (CEI) thread. Though the two series are somewhat different.
The flank angle is 60°.

Major	Major	Tapping	TPI	Pitch
Diameter	Diameter	Drill Size		mm
Inch	mm	mm
0.056	1.422	0.965	62	0.409
0.064	1.626	1.190	62	0.409
0.072	1.829	1.393	62	0.409
0.080	2.032	1.596	62	0.409
0.092	2.337	1.854	56	0.453
0.104	2.642	2.642	44	0.577
0.125	3.175	2.499	40	0.635
0.154	3.912	3.236	40	0.635
0.175	4.445	3.600	32	0.794
0.187	4.762	3.917	32	0.794
0.250	6.350	5.309	26	0.977
0.266	6.756	5.715	26	0.977
0.281	7.137	6.096	26	0.977
0.312	7.937	6.896	26	0.977
0.375	9.525	8.484	26	0.977
0.562	14.287	12.287	20	1.270
1.000	25.400	24.359	26	0.977
1.290	32.766	31.639	24	1.058
1.370	34.797	33.670	24	1.058
1.437	36.512	35.385	24	1.058
1.500	38.100	36.973	24	1.058