Siam Master Precision Tool

NUT TAPS FOR THREADS M7 (U1/4) AND SMALLER

NUT TAPS FOR THREADS M8 (U5/16) AND LARGER

Thread Specification	A Total Length	B Thread Length		C Shank Dia.	Number of grooves
Thread Specification	A Total Length	25 treads	30 treads (SUS)	C Shank Dia.	Number of grooves
M3 × 0.5	58.7	12.5	15	2.3	3
M3.5 × 0.6	58.5	15	18	2.3	3
M4 × 0.7	58.3	17.5	21	3	3
M4.5 × 0.75	58	18.8	22.5	3.5	3
M5 × 0.8	62.8	20	24	3.8	3
M6 × 1	67.4	25	30	4.6	3
M7 × 1	70	25	30	5.6	3
M8 × 1.25	77	31.3	37.5	6	5
M9 ×1.25	89	31.3	37.5	7	5
M10 × 1.5	89	37.5	45	8	5
M11 × 1.5	102	37.5	45	8.8	5
M12 × 1.75	102	43.8	52.5	9.5	5
M14 × 2	114	50	60	11.2	5
M16 × 2	127	50	60	13.1	5
M18 × 2.5	133	62.5	75	14	5
M20 × 2.5	133	62.5	75	16.5	5
M22 × 2.5	146	62.5	75	17.5	5
M24 × 3	165	75	90	18.5	5
M27 × 3	165	75	90	21.5	5

Thread Specification	A Total Length	B Thread Length		C Shank Dia.	Number of grooves
Thread Specification	A Total Length	25 treads	30 treads (SUS)	C Shank Dia.	Number of grooves
M4 × 0.5	58.1	12.5	15	3	3
M5 × 0.5	62.6	12.5	15	4	3
M6 × 0.75	67.2	18.8	22.5	4.5	3
M7 × 0.75	70	18.8	22.5	5.5	3
M8 × 0.75	76	18.8	22.5	6.5	5
M9 × 0.75	89	18.8	22.5	7.5	5
M8 × 1	77	25	30	6.6	5
M9 × 1	89	25	30	7.6	5
M10 × 1	89	25	30	8.6	5
M10 × 1.25	89	31.3	37.5	8	5
M12 × 1.25	102	31.3	37.5	10	5
M14 × 1.25	114	31.3	37.5	12	5
M12 × 1.5	102	37.5	45	9.5	5
M14 × 1.5	114	37.5	45	11.2	5
M16 × 1.5	127	37.5	45	13.1	5
M18 × 1.5	133	37.5	45	15	5
M20 × 1.5	133	37.5	45	16.5	5
M22 × 1.5	146	37.5	45	19	5
M24 × 1.5	165	37.5	45	21.5	5
M18 × 2	133	50	60	15	5
M20 × 2	133	50	60	16.5	5
M22 × 2	146	50	60	19	5
M24 × 2	165	50	60	20	5

Thread Specification	A Total Length	B Thread Length		C Shank Dia.	Number of grooves
Thread Specification	A Total Length	25 treads	30 treads (SUS)	C Shank Dia.	Number of grooves
No. 4-40UNC	58.8	15.9	19.1	2	3
No. 5-40UNC	58.7	15.9	19.1	2.2	3
No. 6-32UNC	58.6	19.8	23.8	2.4	3
No. 8-32UNC	58.2	19.8	23.8	3.1	3
No.10-24UNC	63	26.5	31.8	3.4	3
No.12-24UNC	67.6	26.5	31.8	4	3
1/4-20UNC	72.4	31.8	38.1	4.6	3
5/16-18UNC	77	35.3	42.3	6	5
3/8-16UNC	89	39.7	47.6	7.3	5
7/16-14UNC	102	45.4	54.4	8.6	5
1/2-13UNC	102	48.8	58.6	10	5
9/16-12UNC	114	52.9	63.5	11	5
5/8-11UNC	127	57.7	69.3	12.8	5
3/4-10UNC	133	63.5	76.2	15	5
7/8-9UNC	133	70.6	84.7	17	5
1"-8UNC	165	79.4	95.3	20	5

Thread Specification	A Total Length	B Thread Length		C Shank Dia.	Number of grooves
Thread Specification	A Total Length	25 treads	30 treads (SUS)	C Shank Dia.	Number of grooves
No. 4-48UNF	58.8	13.2	15.9	2	3
No. 5-44UNF	58.7	14.4	17.3	2.2	3
No. 6-40UNF	58.6	15.9	19.1	2.4	3
No. 8-36UNF	58.2	17.6	21.2	3.1	3
No.10-32UNF	62.9	19.8	23.8	3.8	3
No.12-28UNF	67.5	22.7	27.2	4.2	3
1/4-28UNF	67.1	22.7	27.2	4.8	3
5/16-24UNF	77	26.5	31.8	6.3	5
3/8-24UNF	89	26.5	31.8	8	5
7/16-20UNF	102	31.8	38.1	9	5
1/2-20UNF	102	31.8	38.1	10	5
9/16-18UNF	114	35.3	42.3	11.4	5
5/8-18UNF	127	35.3	42.3	13	5
3/4-16UNF	133	39.7	47.6	15	5
7/8-14UNF	133	45.4	54.4	18.5	5
1"-12UNF	165	52.9	63.5	21	5

Thread Specification	A Total Length	B Thread Length		C Shank Dia.	Number of grooves
Thread Specification	A Total Length	25 treads	30 treads (SUS)	C Shank Dia.	Number of grooves
1/8 W 40	58.7	15.9	19.1	2.2	3
5/32 W 32	58.4	19.8	23.8	2.7	3
3/16 W 24	63.2	26.5	31.8	3.2	3
1/4 W 20	72.4	31.8	38.1	4.6	3
5/16 W 18	77	35.3	42.3	6	5
3/8 W 16	89	39.7	47.6	7.3	5
7/16 W 14	102	45.4	54.4	8.6	5
1/2 W 12	102	52.9	63.5	9.5	5
9/16 W 12	114	52.9	63.5	10.5	5
5/8 W 11	127	57.7	69.3	12	5
3/4 W 10	133	63.5	76.2	15	5
7/8 W 9	133	70.6	84.7	17	5
1" W 8	165	79.4	95.3	20	5

Thread Specification	Threads per inch (25.4 mm)	L Total Length	l Thread Length	Ds Shank Dia.
M2.6 X 0.45	30T	55	13.5	2
M3 X 0.5		58.6	15	2.3
M4 X 0.7		58.2	21	3
M5 X 0.8		62.8	24	3.8
M6 X 1		67.4	30	4.5
M7 X 1		70	30	5.6
M8 X 1.25		85	37.5	6.05
M8 X 1		77	30	6.4
M10 X 1.5		89	45	7.8
M10 X 1.25		89	37.5	8.1
M10 X 1		89	30	8.4
M12 X 1.75		102	52.5	9.5
M12 X 1.5		102	45	9.8
M12 X 1.25		102	37.5	10.1
M12 X 1		102	30	10.5
M14 X 2		114	60	11.2
M14 X 1.5		114	45	11.2
M16 X 2		127	60	13.1
M16 X 1.5		127	45	13.1
M18 X 2.5		133	75	14
M18 X 2		133	60	15
M20 X 2.5		133	75	15.5
M20 X 2		133	60	16.5
M20 X 1.5		133	45	16.5
M22 X 2.5		146	75	16.5
M22 X 2		146	60	19
M24 X 3		165	90	18.5
M24 X 2		165	60	20
M24 X 1.5		165	45	21.5

Thread Specification	Threads per inch (25.4 mm)	L Total Length	l Thread Length	Ds Shank Dia.
NO.4 - 40 UNC	30T	58.9	19.1	2
NO.4 - 48 UNF		58.9	15.9	2
NO.5 - 40 UNC		58.6	19.1	2.2
NO.5 - 44 UNF		58.6	17.3	2.2
NO.6 - 32 UNC		60.6	23.8	2.4
NO.6 - 40 UNF		60.6	19.1	2.6
NO.8 - 32 UNC		60.2	23.8	3.1
NO.8 - 36 UNF		60.2	21.2	3.1
NO.10 - 24 UNC		69	31.8	3.4
NO.10 - 32 UNF		68.7	23.8	3.7
NO.12 - 24 UNC		69.7	31.8	4
NO.12 - 28 UNF		69.5	27.2	4.2
1/4 - 20 UNC		72.3	38.1	4.5
1/4 - 28 UNF		71.9	27.2	5
5/16 - 18 UNC		80	42.3	6
5/16 - 24 UNF		80	31.8	6.3
3/8 - 16 UNC		89	47.6	7.3
3/8 - 24 UNF		89	31.8	8
7/16 - 14 UNC		102	54.4	8.6
7/16 - 20 UNF		102	38.1	9.3
1/2 - 13 UNC		102	58.6	10
1/2 - 20 UNF		102	38.1	10.9
9/16 - 12 UNC		114	63.5	11
9/16 - 18 UNF		114	42.3	11.4
5/8 - 11 UNC		127	69.3	12.8
5/8 - 18 UNF		127	42.3	13.1
3/4 - 10 UNC		133	76.2	15
3/4 - 16 UNF		133	47.6	15
7/8 - 9 UNC		146	84.7	17
7/8 - 14 UNF		146	54.4	18.5
1 - 8 UNC		165	95.3	20
1 - 12 UNF		165	63.5	21

Thread Specification	Threads per inch (25.4 mm)	L Total Length	l Thread Length	Ds Shank Dia.
W 3/16 - 24	30T	69	31.8	3.2
W 1/4 - 20		72.4	38.1	4.5
W 5/16 - 18		80	42.3	6
W 3/8 - 16		89	47.6	7.3
W 7/16 - 14		102	54.4	8.6
W 1/2 - 12		102	63.5	9.5
W 9/16 - 12		114	63.5	10.5
W 5/8 - 11		127	69.3	12
W 3/4 - 10		133	76.2	15
W 7/8 - 9		133	84.7	17
W 1 - 8		165	95.3	20