BSF UNC/BSW UNF

Material Special Tools Steel
Hardness 58° to 60° HRC

HT-102

BSF(British Standard Fine)
BSW(British Standard Whiteworth)

Thread Angle 55°

Nominal Diameter Inches	Thread Per Inch		No. of Flutes
	BSW	BSF
1/16	60	-	3
3/32	48	-	3
1/8	40	-	3
5/32	32	-	3
3/16	24	32	3
7/32	24	28	3
1/4	20	26	4
9/32	20	26	4
5/16	18	22	4
3/8	16	20	4
7/16	14	18	4
1/2	12	16	4
9/16	12	16	4
5/8	11	14	4
11/16	11	14	4
3/4	10	12	4
13/16	10	12	4
7/8	9	11	4
15/16	9	11	4
1	8	10	4
1-1/8	7	9	6
1-1/4	7	9	6
1-3/8	6	8	6
1-1/2	6	8	6
1-5/8	5	8	8
1-3/4	5	7	6
1-7/8	4-1/2	7	6
2	4-1/2	7	6
2-1/4	4	6	6
2-1/2	4	6	6
2-3/4	3-1/2	6	6
3	3-1/2	5	6
3-1/4	3-1/4	5	6
3-1/2	3-1/4	4-1/2	6
3-3/4	3	4-1/2	6
4	3	4-1/2	6

HT-103

UNC(Unified National Coarse)
UNF(UNified National Fine)

Thread Angle 60°

Screw Gauge No.	Nominal Diameter Inches		Threads Per Inch
	UNC	UNF
0	0.060	---	80
1	0.073	64	72
2	0.086	56	64
3	0.099	48	56
4	0.112	40	48
5	0.125	40	44
6	0.138	32	40
9/32	20	26	4
5/16	18	22	4
3/8	16	20	4
7/16	14	18	4
1/2	12	16	4
9/16	12	16	4
5/8	11	14	4
11/16	11	14	4
3/4	10	12	4
13/16	10	12	4
7/8	9	11	4
15/16	9	11	4
1	8	10	4
1-1/8	7	9	6
1-1/4	7	9	6
1-3/8	6	8	6
1-1/2	6	8	6
1-5/8	5	8	8
1-3/4	5	7	6
1-7/8	4-1/2	7	6
2	4-1/2	7	6
2-1/4	4	6	6
2-1/2	4	6	6
2-3/4	3-1/2	6	6
3	3-1/2	5	6
3-1/4	3-1/4	5	6
3-1/2	3-1/4	4-1/2	6
3-3/4	3	4-1/2	6
4	3	4-1/2	6

Bottoming Tap 23" per side

Second Tap 8" per side Tap 8" per side

Taper Tap 4" per side