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S. J. Thread

Precursor of the metric ISO-thread. The metric S.J.-thread was developed in 1898 following an agreement between German, French, Swiss and Belgian engineers in Zurich. The flank angle is 60°.

Screw Diameter	Pitch	Tapping Drill Size	Nut Clearance Diameter	Wrench Size
mm	mm	mm	mm	mm
6	1.00	4.60	4.70	12
7	1.00	5.60	5.70	13
8	1.25	6.25	6.38	15
9	1.25	7.25	7.38	16
10	1.50	7.90	8.05	18
11	1.50	8.90	9.05	19
12	1.75	9.55	9.73	21
14	2.00	11.20	11.40	23
16	2.00	13.20	13.40	26
18	2.50	14.50	14.75	29
20	2.50	16.50	16.75	32
22	2.50	18.50	18.75	35
24	3.00	19.80	20.10	38
27	3.00	22.80	23.10	42
30	3.50	25.10	25.45	46
33	3.50	28.10	28.45	50
36	4.00	30.40	30.80	54
39	4.00	33.40	33.80	58
42	4.50	35.70	36.15	63
45	4.50	38.70	39.15	67
48	5.00	41.00	41.50	71
52	5.00	45.00	45.50	77
56	5.50	48.30	48.85	82
60	5.50	52.30	52.85	88
64	6.00	55.60	56.20	94
68	6.00	59.60	60.20	100
72	6.50	62.90	63.55	105
76	6.50	66.90	67.55	110
80	7.00	70.20	70.90	116