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French Thread

Was used in France before introduction of the S.I. Thread. S.F. = System Français.
The flank angle is 60°

Thread-	Nominal	Pitch	Tapping
No.	Diameter	mm	Drill Size
	mm		mm
0	6	1.00	4.70
-	8	1.00	6.70
1	10	1.50	8.05
-	12	1.50	10.05
2	14	2.00	11.40
-	16	2.00	13.40
3	18	2.50	14.75
-	20	2.50	16.75
-	22	2.50	18.75
4	24	3.00	20.10
-	26	3.00	22.10
-	28	3.00	24.10
5	30	3.50	25.45
-	32	3.50	27.45
-	34	3.50	29.45
6	36	4.00	30.80
-	38	4.00	32.80
-	40	4.00	34.80
7	42	4.50	36.15
-	44	4.50	38.15
-	46	4.50	40.15
8	48	5.00	41.50
-	50	5.00	43.50
9	56	5.50	48.85
10	64	6.00	56.20
11	72	6.50	63.55
12	80	7.00	70.90
13	88	7.50	78.25
14	96	8.00	85.60
15	106	8.50	95.95
16	116	9.00	104.30
17	126	9.50	113.65
18	136	10.00	123.00
19	148	10.50	134.05

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