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Home > Cutting Tools > Taps and Dies > Nitro Spiral Flute Tap > 1/4-20 NITRO SPIRAL FLUTE TAP

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Item #: TAPS025-20SFN

1/4-20 NITRO SPIRAL FLUTE TAP

$36.3161/EA

Quantity	Price
Quantity	Price
1	$36.3161/ EA

Qty

In Stock

Product Specification
Dimensional Specifications
Tap Drill Chart

Dimensional Specifications

Dimensional SpecificationsSpiral Flute Tap

Tap Size	Thread	Overall Length	Square Size	Number of Flutes	Tap/Drill Size (75%)
6	32	2	0.1100	3	#36
8	32	2 1/8	0.1310	3	#29
10	24	2 3/8	0.1520	3	#25
10	32	2 3/8	0.1520	3	#21
1/4	20	2 1/2	0.1910	3	#7
1/4	28	2 1/2	0.1910	3	#3
5/16	18	2 23/32	0.2380	3	F
5/16	24	2 23/32	0.2380	3	I
3/8	16	2 15/16	0.2860	3	5/16
3/8	24	2 15/16	0.2860	3	Q
7/16	14	3 5/32	0.2420	3	U
7/16	20	3 5/32	0.2420	3	W
1/2	13	3 3/8	0.2750	3	27/64
1/2	20	3 3/8	0.2750	3	29/64
5/8	11	3 13/16	0.3600	4	17/32
5/8	18	3 13/16	0.3600	4	37/64
3/4	10	4 1/4	0.4420	4	21/32
3/4	16	4 1/4	0.4420	4	11/16

All dimensions are in inches.

Tap Drill Chart

Tap Drill Chart

Tap Size	Drill Size	Probable % Thread
M3-0.5	40	70-79
5-40	38	65-72
5-44	37	63-71
M3.5-0.6	33	72-81
6-32	36	71-78
6-40	33	69-77
M4-0.7	3.25 mm	74-82
8-32	29	62-69
8-36	29	70-78
10-24	25	69-75
10-32	21	68-76
M5-0.8	4.2 mm	69-77
12-24	16	66-72
12-28	15	70-78
M6-1.0	10	76-84
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	6.7 mm	74-80
3/8-16	5/16	72-77
3/8-24	Q	71-79
M10-1.50	8.4 mm	76-82
7/16-14	U	70-75
7/16-20	25/64	65-72
M12-1.75	13/32	69-74
1/2-13	27/64	73-78
1/2-20	29/64	65-72

Tap Size	Drill Size	Probable % Thread
M14-2.0	15/32	76-81
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
3/4-10	21/32	68-72
3/4-16	11/16	71-77
M20-2.5	11/16	74-78
7/8-9	49/64	72-76
7/8-14	13/16	62-67
M24-3.0	53/64	72-76
1-8	7/8	73-77
1-12	59/64	67-72
1-14	15/16	61-67
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
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