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Thread Dimensions

Metric Coarse Thread Forms and Pitch
Thread Angle 60^{o

You can buy Metric Fasteners from HERE}

Metric Thread Diameter	Coarse Pitch (mm)	Tap Drill Diameter (mm)
M1.6	0.35	1.25
M2	0.40	1.60
M2.5	0.45	2.05
M3	0.50	2.50
M4	0.70	3.30
M5	0.80	4.20
M6	1.00	5.00
M7	1.00	6.00
M8	1.25	6.80
M10	1.50	8.50
M12	1.75	10.20
M14	2.00	12.00
M16	2.00	14.00
M18	2.50	15.50
M20	2.50	17.50
M22	2.50	19.50
M24	3.00	21.00
M27	3.00	24.00
M30	3.50	26.50
M33	3.50	29.50
M36	4.00	32.00
M39	4.00	35.00
M42	4.50	37.50

Metric Fine Thread Forms and Pitch
Thread Angle 60^o
You can buy Metric Fine Pitch fasteners from HERE

Metric Thread Diameter	Fine Pitch (mm)	Tap Drill Diameter (mm)
M1.6	0.20	1.40
M2	0.25	1.75
M2.5	0.35	2.10
M3	0.35	2.60
M4	0.50	3.50
M5	0.50	4.50
M6	0.75	5.20
M7	0.75	6.20
M8	0.75	7.20
M8	1.00	7.00
M10	0.75	9.20
M10	1.00	9.90
M10	1.25	8.80
M12	1.00	11.00
M12	1.25	10.80
M12	1.50	10.50
M14	1.00	13.00
M14	1.25	12.80
M14	1.50	12.50
M16	1.0	15.00
M16	1.50	14.50
M18	1.0, 1.50, 2.00	17.00, 16.50, 16.00
M20	1.00	19.00
M20	1.50	18.50
M20	2.00	18.00

BSW Coarse Thread Forms and Pitch
Thread Angle 55^o
You can buy BSW Fasteners from HERE

BSW Thread Diameter (inches)	Threads Per Inch	Tap Drill Diameter (mm)
1/8"	40	2.50
3/16"	24	3.70
1/4"	20	5.10
5/16"	18	6.50
3/8"	16	7.90
7/16"	14	9.20
1/2"	12	10.40
9/16"	12	11.89
5/8"	11	13.40
3/4"	10	16.25
1"	8	22.00
1 1/4"	7	27.25
1 1/2"	6	33.50
1 3/4"	5	38.50
2"	4 1/2	44.50

BSF Fine Thread Forms and Pitch
Thread Angle 55^o
You can buy BSF Fasteners from HERE

BSF Thread Diameter (inches)	Threads Per Inch	Tap Drill Diameter (mm)
3/16"	32	4.00
1/4"	26	5.30
5/16"	22	6.80
3/8"	20	8.30
7/16"	18	9.70
1/2"	16	11.10
9/16"	16	12.70
5/8"	14	14.00
3/4"	12	16.75
1"	10	22.75
1 1/4"	9	28.75
1 1/2"	8	34.50
1 3/4"	7	40.50
2"	7	47.00

UNC Coarse Thread Forms and Pitch
Thread Angle 60^o
You can buy UNC Fasteners from HERE

UNC Thread Diameter (inches)	Threads Per Inch	Tap Drill Diameter (mm)
1 - 64	64	1.50
2 - 56	56	1.80
3 - 48	48	2.10
4 - 40	40	2.35
5 - 40	40	2.65
6 - 32	32	2.85
8 - 32	32	3.50
10 - 24	24	4.00
12 - 24	24	4.65
1/4" - 20	20	5.35
5/16" - 18	18	6.80
3/8" - 16	16	8.25
7/16" - 14	14	9.65
1/2" - 13	13	11.15
9/16" - 12	12	12.60
5/8" - 11	11	14.05
3/4" - 10	10	17.00
7/8" - 9	9	20.00
1" - 8	8	22.85
1 1/4" - 7	7	28.85
1 1/2" - 6	6	34.70
1 3/4" - 5	5	40.40
2" - 4 1/2	4.5	46.30

UNF Fine Thread Forms and Pitch
Thread Angle 60^{o

You can buy UNF Fasteners from HERE}

UNF Thread Diameter (inches)	Threads Per Inch	Tap Drill Diameter (mm)
0 - 80	80	1.25
1 - 72	72	1.55
2 - 64	64	1.90
3 - 56	56	2.15
4 - 48	48	2.40
5 - 44	44	2.70
6 - 40	40	2.95
8 - 36	36	3.50
10 - 32	32	4.10
12 - 28	28	4.70
1/4" - 28	28	5.50
5/16" - 24	24	6.90
3/8" - 24	24	8.50
7/16" - 20	20	9.90
1/2" - 20	20	11.50
9/16" - 18	18	12.90
5/8" - 18	18	14.50
3/4" - 16	16	17.50
7/8" - 14	14	20.40
1" - 12	12	23.25
1 1/4" - 12	12	29.50
1 1/2" - 12	12	36.00

BA Thread Forms and Pitch
Thread Angle 47.5^{o

You can buy BA Fasteners from HERE}

BA Thread Diameter	Threads Per Inch	Tap Drill Diameter (mm)
16BA	134.0	0.60
15BA	121.0	0.70
14BA	110.0	0.80
13BA	102.0	0.98
12BA	90.7	1.05
11BA	82.0	1.20
10BA	72.6	1.40
9BA	65.1	1.55
8BA	59.1	1.80
7BA	52.9	2.05
6BA	47.9	2.30
5BA	43.0	2.65
4BA	38.5	3.00
3BA	34.8	3.40
2BA	31.4	4.00
1BA	28.2	4.50
0BA	25.4	5.10