Drill Tapping Tables Metric Threads, Coarse & Fine Pitch (Dimensions in mm)
Diameter	Coarse Pitch	Fine Pitch	Tapping Hole
M2	0.4	-	1.60
M2.5	0.45	-	2.05
M3	0.5	-	2.50
M3.5	0.6	-	2.90
M4	0.7	-	3.30
M4.5	0.75	-	3.70
M5	0.8	-	4.20
M6	1	-	5.00
M8	1.25	-	6.80
M10	1.5	-	8.50
M10	-	1.25	8.80
M12	1.75	-	10.20
M12	-	1.25	10.80
M12	-	1.5	10.50
M14	2	-	12.00
M14	-	1.5	12.50
M16	2	-	14.00
M16	-	1.5	14.50
M18	2.5	-	15.50
M18	-	1.5	16.50
M20	2.5	-	17.50
M20	-	1.5	18.50
M22	2.5	-	19.50
M22	-	1.5	20.50
M24	3	-	21.00
M24	-	1.5	22.50
M24	-	2	22.00
M27	3	-	24.00
M30	3.5	-	26.50
M33	3.5	-	29.50
M36	4	-	32.00

Drill Tapping Tables Imperial UNF Threads (Dimensions in mm)
Diameter	Pitch TPI	Tapping Hole
#1	72	1.60
#2	64	1.90
#3	56	2.15
#4	48	2.40
#5	44	2.70
#6	40	2.95
#8	36	3.50
#10	32	4.10
#12	28	4.70
1/4	28	5.50
5/16	24	6.90
3/8	24	8.50
7/16	20	10.00
1/2	20	11.50
9/16	18	12.80
5/8	18	14.50
3/4	16	17.50
7/8	14	20.50
1	12	23.50
1	14	24.00
1 1/8	12	26.50
1 1/4	12	29.50
1 3/8	12	33.00
1 1/2	12	36.00

Drill Tapping Tables Imperial UNC Threads (Dimensions in mm)
Diameter	Pitch TPI	Tapping Hole
#1	64	1.50
#2	56	1.85
#3	48	2.10
#4	40	2.35
#5	40	2.65
#6	32	2.85
#8	32	3.50
#10	24	3.90
#12	24	4.50
1/4	20	5.10
5/16	18	6.60
3/8	16	8.00
7/16	14	9.50
1/2	13	10.80
9/16	12	12.20
5/8	11	13.50
3/4	10	16.50
7/8	9	19.50
1	8	22.50
1 1/8	7	25.00
1 1/4	7	28.00
1 3/8	6	31.00
1 1/2	6	34.00

Drill Tapping Tables Imperial BSW Threads (Dimensions in mm)
Diameter	BSW Pitch TPI	Tapping Hole
1/16	60	1.20
3/32	48	1.90
1/8	40	2.55
5/32	32	3.20
3/16	24	3.70
7/32	24	4.50
1/4	20	5.10
5/16	18	6.50
3/8	16	7.90
7/16	14	9.50
1/2	12	10.50
9/16	12	12.20
5/8	11	13.50
3/4	10	16.50
7/8	9	19.50
1	8	22.00
1 1/8	7	25.00
1 1/4	7	28.00
1 1/2	6	33.50
1 3/4	5	39.00
2	4.5	44.50
2	4.5	44.50

Screw Gauge Conversion Chart
2g	2.2mm	7g	3.9mm
4g	2.9mm	8g	4.2mm
6g	3.5mm	10g	4.8mm

ISO Metric Threads Diameter / Pitch Combinations
Diameter	UNC	UNF	BSW
#0	-	80	-
#1	64	72	-
#2	56	64	-
#3	48	56	-
#4	40	48	-
#5	40	44	40
#6	32	40	-
#8	32	36	-
#10	24	32	24
#12	24	28	-
1/4	20	28	20
5/16	18	24	18
3/8	16	24	16
7/16	14	20	14
1/2	13	20	12
9/16	12	18	12
5/8	11	18	11
3/4	10	16	10
7/8	9	14	9
1	8	12 (14)	8
1 1/8	7	12	7
1 1/4	7	12	7
1 3/8	6	12	6
1 1/2	6	12	6
1 5/8	-	-	5
1 3/4	5	-	5
1 7/8	-	-	-
2	4.5	-	4.5
2 1/4	4.5	-	4
2 1/2	4	-	3.5
2 3/4	4	-	3.25

ISO Imperial Threads Diameter / Pitch Combinations
Diameter	Coarse Thread	Fine Thread	Extra Fine Thread
M1.6	0.35	0.25	-
M2	0.40	0.25	-
M2.5	0.45	0.35	-
M3	0.50	0.35	-
M3.5	0.60	-	-
M4	0.70	0.50	-
M5	0.80	0.50	-
M6	1.00	0.75	-
M8	1.25	1.00	0.75
M10	1.50	1.25	1.00
M12	1.75	1.50	1.25
M14	2.00	1.25	1.00
M16	2.00	1.50	1.00
M18	2.50	1.25	-
M20	2.50	2.00	1.50
M22	2.50	2.00	-
M24	3.00	2.00	1.50
M27	3.00	2.00	-
M30	3.50	2.00	-
M33	3.50	2.00	-
M36	4.00	3.00	-
M39	4.00	3.00	-
M42	4.50	4.00	-
M45	4.50	4.00	-
M48	5.00	4.00	-
M52	5.00	4.00	-
M56	5.50	4.00	-
M60	5.50	4.00	-
M64	6.00	4.00	-
M72	6.00	4.00	-

For more technical infomation and support please contact our friendly staff at Suncoast Bolts and Fasteners.

www.suncoastbolts.com.au - 07 5493 4511 - 19 Production Avenue, Warana QLD 4575

Conversion Charts

CONVERSION CHARTS