1/4-28 HIGH SPEED STEEL BOTTOM TAP

$9.33013/EA

Quantity	Price
Quantity	Price
1	$9.33013/ EA

In Stock

Product Specification
Dimensional Specifications
Tap Drill Chart

Dimensional Specifications

Dimensional SpecificationsHSS Tap

Tap Size	Thread	Drill Size	Probable % of Thread	Overall Length	Length of Thread	Number of Flutes
M1.6	.35MM	1.25MM	69-77	1 5/8	5/16	2
0	80	3/64	71-81	1 11/16	3/8	2
1	64	53	59-67	1 11/16	3/8	2
1	72	53	67-75	1 11/16	3/8	2
M2	.40MM	1/16	72-79	1 3/4	7/16	3
2	56	50	62-69	1 3/4	7/16	3
2	64	50	70-79	1 3/4	7/16	3
M2	.45MM	2.05MM	69-77	1 3/4	7/16	3
3	48	5/64	70-77	1 13/16	1/2	3
3	56	46	69-78	1 13/16	1/2	3
4	40	43	65-71	1 7/8	9/16	3
4	48	42	61-68	1 7/8	9/16	3
M3	.50MM	40	70-79	1 15/16	5/8	3
5	40	38	65-72	1 15/16	5/8	3
5	44	37	63-71	1 15/16	5/8	3
M3.5	.60MM	33	72-81	2	11/16	3
6	32	36	71-78	2	11/16	3
6	40	33	69-77	2	11/16	3
M4	.70MM	30	69	2 1/8	3/4	4
8	32	29	62-69	2 1/8	3/4	4
8	36	29	70-78	2 1/8	3/4	4
10	24	25	69-75	2 3/8	7/8	4
10	32	21	68-79	2 3/8	7/8	4
M5	.80MM	19	69	2 3/8	7/8	4
12	24	16	66-72	2 3/8	15/16	4
12	28	15	70-78	2 3/8	15/16	4
M6	1.00MM	10	76-84	2 1/2	1	4
M6	.75MM	4	73	2 1/2	1	4
1/4	20	7	70-75	2 1/2	1	4
1/4	28	3	72-80	2 1/2	1	4
5/16	18	F	72-77	2 23/32	1 1/8	4
5/16	24	1	67-75	2 23/32	1 1/8	4
M8	1.25MM	17/64	71	2 23/32	1 1/8	4
M8	1.00MM	J	66	2 23/32	1 1/8	4
3/8	16	5/16	72-77	2 15/16	1 1/4	4
3/8	24	Q	71-79	2 15/16	1 1/4	4
M10	1.00MM	8.9MM		2 15/16	1 1/4	4
M10	1.50MM	Q	75	2 15/16	1 1/4	4
M10	1.25MM	11/32	71	2 15/16	1 1/4	4
7/16	14	U	70-75	3 5/32	1 7/16	4
7/16	20	25/64	65-72	3 5/32	1 7/16	4
M12	1.75MM	13/32	69-74	4 11/16	2 7/32	4
M12	1.50MM	10.50MM		3 3/8	1 21/32	4
M12	1.25MM	27/64	72	2 15/16	1 1/4	4
1/2	13	27/64	73-78	3 3/8	1 21/32	4
1/2	20	29/64	65-72	3 3/8	1 21/32	4
M14	2.00MM	15/32	76-81	3 19/32	1 21/32	4
M14	1.50MM	12.50MM	71	3 19/32	1 21/32	4
M14	1.25MM	12.80MM		3 19/32	1 21/32	4
9/16	12	31/64	68-72	3 19/32	1 21/32	4
9/16	18	33/64	58-65	3 19/32	1 21/32	4
5/8	11	17/32	75-79	3 13/16	1 13/16	4
5/8	18	37/64	58-65	3 13/16	1 13/16	4
M16	2.00MM	35/64	76-81	3 13/16	1 13/16	4
M16	1.50MM	14.50MM	71	3 13/16	1 13/16	4
M18	2.50MM	15.80MM	77	4 1/32	1 13/16	4
M18	2.00MM	14.00MM		4 1/32	1 13/16	4
M18	1.00MM	17.00MM		4 1/32	1 13/16	4
3/4	10	21/32	68-72	4 1/4	2	4
3/4	16	11/16	71-77	4 1/4	2	4
M20	2.50MM	11/16	74-78	4 15/32	2	4
M20	1.50MM	47/64		4 15/32	2	4
M20	1.00MM	19.00MM		4 15/32	2	4
7/8	9	49/64	72-76	4 11/16	2 7/32	4
7/8	14	13/16	62-67	4 11/16	2 7/32	4
M22	2.50MM	49/64	66	4 11/16	2 7/32	4
M22	1.50MM	13/16	70	4 11/16	2 7/32	4
M24	3.00MM	53/64	72-76	4 29/32	2 7/32	4
M24	2.00MM	22.00MM		4 29/32	2 7/32	4
M24	1.50MM	57/64		4 29/32	2 7/32	4
1	8	7/8	73-77	5 1/8	2 1/2	4
1	12	59/64	67-75	5 1/8	2 1/2	4
1	14	15/16	61-67	5 1/8	2 1/2	4
M27	3.00MM	61/64	72	5 1/8	2 1/2	4
M27	2.00MM	63/64	77	5 1/8	2 1/2	4
1 1/8	7	63/64	72-76	5 7/16	2 9/16	4
1 1/8	12	1 3/64	66-72	5 7/16	2 9/16	4
M30	3.50MM	1 3/64	75	5 7/16	2 9/16	4
1 1/4	7	1 7/64	76	5 3/4	2 9/16	4
1 1/4	12	1 11/64	72	5 3/4	2 9/16	6
M33	3.50MM	1 11/64	74	5 3/4	2 9/16	4
1 3/8	6	1 7/32	72	6 1/16	3	4
1 3/8	12	1 19/64	72	6 1/16	3	6
M36	4.00MM	1 1/4	82	6 1/16	3	4
1 1/2	6	1 11/32	72	6 3/8	3	4
1 1/2	12	1 27/64	72	6 3/8	3	6

Tap Drill Chart

Tap Size	Drill Size	Probable % Thread
M1.6-0.35	.35MM	69-77
0-80	80	71-81
1-64	64	59-67
1-72	72	67-75
M2-0.4	.40MM	72-79
2-56	56	62-69
2-64	64	70-79
M2-0.45	.45MM	69-77
3-48	48	70-77
3-56	56	69-78
4-40	40	65-71
4-48	48	61-68
M3-0.5	.50MM	70-79
5-40	40	65-72
5-44	44	63-71
M3.5-0.6	.60MM	72-81
6-32	32	71-78
6-40	40	69-77
M4-0.7	.70MM	69
8-32	32	62-69
8-36	36	70-78
10-24	24	69-75
10-32	32	68-79
M5-0.8	.80MM	69
12-24	16	66-72
12-28	15	70-78
M6-1.0	10	76-84
M6-0.75	4	73
1/4-20	7	70-75
1/4-28	3	72-80
5/16-18	F	72-77
5/16-24	I	67-75
M8-1.25	17/64	71
M8-1.0	J	66
3/8-16	5/16	72-77
3/8-24	Q	71-79
M10-1.0	8.9MM
M10-1.50	Q	76-82
M10-1.25	11/32	71
7/16-14	U	70-75
7/16-20	25/64	65-72
M12-1.75	13/32	69-74
M12-1.5	10.5MM
M12-1.25	27/64	72
1/2-13	27/64	73-78

Tap Size	Drill Size	Probable % Thread
1/2-20	29/64	65-72
M14-2.0	15/32	76-81
M14-1.5	12.5MM	71
M14-1.25	12.8MM
9/16-12	31/64	68-72
9/16-18	33/64	58-65
5/8-11	17/32	75-79
5/8-18	37/64	58-65
M16-2.0	35/64	76-81
M16-1.5	14.5MM	71
M18-2.5	15.8MM	77
M18-2.0	14MM
M18-1.0	17MM
3/4-10	21/32	68-72
3/4-16	11/16	71-77
M20-2.5	11/16	74-78
M20-1.5	47/64
M20-1.0	19MM
7/8-9	49/64	72-76
7/8-14	13/16	62-67
M22-2.5	49/64	66
M22-1.5	13/16	70
M24-3.0	53/64	72-76
M24-2.0	22MM
M24-1.5	57/64
1-8	7/8	73-77
1-12	59/64	67-72
1-14	15/16	61-67
M27-3.0	61/64	72
M27-2.0	63/64	77
1-1/8-7	63/64	72-76
1-1/8-8	1	76
1-1/8-12	1-3/16	66-72
M30-3.5	1-3/64	75
1-1/4-7	1-7/64	76
1-1/4-8	1-1/8	76
1-1/4-12	1-11/64	72
M33-3.5	1-11/64	74
1-3/8-6	1-7/32	72
1-3/8-12	1-19/64	72
M36-4.0	1-1/4	82
1-1/2-6	1-11/32	72
1-1/2-8	1-3/8	76
1-1/2-12	1-27/64	72

NPT Tap Size	Taper Pipe Drill Size	Straight Pipe Drill Size
1/8-27	R	11/32
1/4-18	7/16	7/16
3/8-18	37/64	37/64
1/2-14	45/64	23/32
3/4-14	59/64	59/64
1-11.5	1-5/32	1-5/32
1-1/4-11.5	1-31/64	1-1/2
1-1/2-11.5	1-47/64	1-3/4
2-11.5	2-7/32	2-7/32

Size	1/4
Tap Type	Bottom
Bit Decimal	0.2500
Overall Length	2 1/2
Thread Length	1
Material	High Speed Steel
Origin	Domestic
Weight	0.03,

1/4-28 HIGH SPEED STEEL BOTTOM TAP

1/4-28 HIGH SPEED STEEL BOTTOM TAP

Technical Data

Product Specification

Dimensional Specifications

Dimensional SpecificationsHSS Tap

Tap Drill Chart

Tap Drill Chart