French Thread

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

Thread- No.	Nominal Diameter mm	Pitch mm	Tapping Drill Size mm
0	6.00	1.00	4.70
-	8.00	1.00	6.70
1	10.00	1.50	8.05
-	12.00	1.50	10.05
2	14.00	2.00	11.40
-	16.00	2.00	13.40
3	18.00	2.50	14.75
-	20.00	2.50	16.75
-	22.00	2.50	18.75
4	24.00	3.00	20.10
-	26.00	3.00	22.10
-	28.00	3.00	24.10
5	30.00	3.50	25.45
-	32.00	3.50	27.45
-	34.00	3.50	29.45
6	36.00	4.00	30.80
-	38.00	4.00	32.80
-	40.00	4.00	34.80
7	42.00	4.50	36.15
-	44.00	4.50	38.15
-	46.00	4.50	40.15
8	48.00	5.00	41.50
-	50.00	5.00	43.50
9	56.00	5.50	48.85
10	64.00	6.00	56.20
11	72.00	6.50	63.55
12	80.00	7.00	70.90
13	88.00	7.50	78.25
14	96.00	8.00	85.60
15	106.00	8.50	95.95
16	116.00	9.00	104.30
17	126.00	9.50	113.65
18	136.00	10.00	123.00
19	148.00	10.50	134.05
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