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HS Fractional Bottoming Taps

HS Fractional Bottoming Taps

Fractional Bottoming taps. National Coarse and National Fine. High Speed Steel Taps. Ground Thread.

Please note that not all bottoming taps are flattened at the end.
Some manufacturers leave a point that you may have to grind off if going very close to the bottom of a hole.

Basic tap types:
Taper tap: 5-6 lead threads ground. The easiest tap for starting to thread a hole.
Plug tap: 3-4 lead threads ground. The most common tap: a "middle ground" tap for threading.
Bottoming tap: 1-2 lead threads ground. Used for continuing to thread a blind hole close to the bottom of the hole. It's difficult to start threading a hole with this tap.
Bottoming taps are not necessarily flat on the bottom - they sometimes have a 60 degree tapered point from the manufacturing process.
Spiral Point tap: A tap with a chisled point that pushes metal chips ahead of the forming threads.
Extremely useful for tapping through-holes (ie holes that extend through the work.) Often machine-driven.
Spiral Point taps are not recommended for use in blind holes: the accumulation of chips can tend to bind and break these taps more easily than others.

Recommended drill sizes are for approximately 75% thread.

Follow this link to see the corresponding Dies for these Taps.

Follow this link to explore our complete offering of taps, dies, and other threading tools.
Quantity Price Model Description Size Drill Size

$5.20 TAB-0-80
#0-80 HS Bottoming Tap 0300-0015 0-80 3/64"

$5.20 TAB-1-64
#1-64 HS Bottoming Tap 0300-0030 1-64 #54

$5.20 TAB-1-72
#1-72 HS Bottoming Tap 0300-0046 1-72 #53

$4.50 TAB-2-56
#2-56 HS Bottoming Tap 0300-0061 2-56 #51

$4.50 TAB-2-64
#2-64 HS Bottoming Tap 0300-0076 2-64 #50

$3.50 TAB-3-48
#3-48 HS Bottoming Tap 0300-0091 3-48 5/64"

$3.50 TAB-3-56
#3-56 HS Bottoming Tap 0300-0106 3-56 #46

$2.90 TAB-4-36
#4-36 HS Bottoming Tap 0300-0109 4-36 #44

$2.90 TAB-4-40
#4-40 HS Bottoming Tap 0300-0121 4-40 #43

$2.90 TAB-4-48
#4-48 HS Bottoming Tap 0300-0136 4-48 #42

$2.90 TAB-5-40
#5-40 HS Bottoming Tap 0300-0151 5-40 #39

$2.90 TAB-5-44
#5-44 HS Bottoming Tap 0300-0166 5-44 #37

$2.30 TAB-6-32
#6-32 HS Bottoming Tap 0300-0181 6-32 #36

$2.30 TAB-6-40
#6-40 HS Bottoming Tap 0300-0196 6-40 #33

$2.30 TAB-8-32
#8-32 HS Bottoming Tap 0300-0211 8-32 #29

$2.30 TAB-8-36
#8-36 HS Bottoming Tap 0300-0226 8-36 #29

$2.40 TAB-10-24
#10-24 HS Bottoming Tap 0300-0241 10-24 #25

$2.40 TAB-10-32
#10-32 HS Bottoming Tap 0300-0256 10-32 #21

$2.50 TAB-12-24
#12-24 HS Bottoming Tap 0300-0271 12-24 #17

$2.50 TAB-12-28
#12-28 HS Bottoming Tap 0300-0286 12-28 #15

$2.45 TAB-1/4-20
1/4"-20 HS Bottoming Tap 0329-0016 1/4-20 #7

$2.45 TAB-1/4-28
1/4"-28 HS Bottoming Tap 0329-0031 1/4-28 #3

$2.90 TAB-5/16-18
5/16"-18 HS Bottoming Tap 0329-0046 5/16-18 F

$2.90 TAB-5/16-24
5/16"-24 HS Bottoming Tap 0329-0061 5/16-24 I

$3.30 TAB-3/8-16
3/8"-16 HS Bottoming Tap 0329-0076 3/8-16 5/16"

$3.30 TAB-3/8-24
3/8"-24 HS Bottoming Tap 0329-0091 3/8-24 Q

$5.50 TAB-7/16-14
7/16"-14 HS Bottoming Tap 0329-0106 7/16-14 U

$5.50 TAB-7/16-20
7/16"-20 HS Bottoming Tap 0329-0121 7/16-20 W

$6.10 TAB-1/2-13
1/2"-13 HS Bottoming Tap 0329-0136 1/2-13 27/64"

$6.10 TAB-1/2-20
1/2"-20 HS Bottoming Tap 0329-0151 1/2-20 29/64"

$9.50 TAB-9/16-12
9/16"-12 HS Bottoming Tap 0330-0016 9/16-12 31/64"

$9.50 TAB-9/16-18
9/16"-18 HS Bottoming Tap 0330-0031 9/16-18 33/64"

$11.00 TAB-5/8-11
5/8"-11 HS Bottoming Tap 0330-0046 5/8-11 17/32"

$11.00 TAB-5/8-18
5/8"-18 HS Bottoming Tap 0330-0061 5/8-18 37/64"

$16.00 TAB-3/4-10
3/4"-10 HS Bottoming Tap 0330-0076 3/4-10 21/32"

$16.00 TAB-3/4-16
3/4"-16 HS Bottoming Tap 0330-0091 3/4-16 11/16"

$21.50 TAB-7/8-9
7/8"-9 HS Bottoming Tap 0331-0016 7/8-9 49/64"

$21.50 TAB-7/8-14
7/8"-14 HS Bottoming Tap 0331-0031 7/8-14 13/16"

$29.50 TAB-1-8
1"-8 HS Bottoming Tap 0331-0046 1"-8 7/8"

$29.50 TAB-1-12
1"-12 HS Bottoming Tap 0331-0061 1"-12 59/64"

$29.50 TAB-1-14
1"-14 HS Bottoming Tap 0331-0076 1"-14 15/16"

$46.00 TAB-1-1/8-7
1-1/8"-7 HS Bottoming Tap 0331-0091 1 1/8-7 63/64"

$46.00 TAB-1-1/8-12
1-1/8"-12 HS Bottoming Tap 0331-0106 1 1/8-12 1-3/64"

$61.00 TAB-1-1/4-7
1-1/4"-7 HS Bottoming Tap 0331-0121 1 1/4-7 1-7/64"

$61.00 TAB-1-1/4-12
1-1/4"-12 HS Bottoming Tap 0331-0136 1 1/4-12 1-11/64"

$76.00 TAB-1-3/8-6
1-3/8"-6 HS Bottoming Tap 0331-0151 1 3/8-6 1-7/32"

$76.00 TAB-1-3/8-12
1-3/8"-12 HS Bottoming Tap 0331-0166 1 3/8-12 1-19/64"

$87.00 TAB-1-1/2-6
1-1/2"-6 HS Bottoming Tap 0331-0181 1 1/2-6 1-11/32"

$87.00 TAB-1-1/2-12
1-1/2"-12 HS Bottoming Tap 0331-0196 1 1/2-12 1-27/64"