Historical & Obsolete

C.E.I. Cycle Thread

Threads that have been withdrawn or superseded. Listed for repair, restoration and reverse-engineering of older equipment.

Flank angle: 60°
Sizes listed: 21
Range: 0.056 – 1.500

Profile shape (schematic, not to scale)

Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch 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

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Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.

C.E.I. Cycle Thread

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