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DRILL GUIDE
SAE
1/4NPT-18
9/16"-12
9/16"-18
5/8"-11
5/8"-18
3/4"-10
3/4"-16
7/8"-9
7/8"-14
1"-8
1"-14
LUBRICATION
Be sure to use the proper lubricant while threading. Lubrication is necessary for accurately formed threads.
It also prevents damage to taps and dies, helping to extend tool life. The lubricant should be applied to the
cutting edges during the threading operation.
USING TAPS
Taps are used to cut threads inside a hole, creating a threaded receiver
for a bolt or screw. The taps in this set are called plug taps. They are the
most common, general-purpose tap design. They feature a tapered end
of 3 to 5 chamfered threads, allowing an easier gradual entry into hole.
a.) Check hardness
Do not try to thread hardened metals. Use a file to test the hardness
of the material. If it cannot be cut by a file, the material is too hard for
use with the taps or dies.
b.) Drill
Starting with the proper hole size (see chart) is very important.
An oversized hole will produce poorly formed threads with reduced
thread depth. A hole that is too small will make turning the tap very
difficult and may break the tap. Refer to the included Drill Guide
for the recommended drill size for each tap size. If possible, drill
using a drill press (recommended) or similar machine, if not possible
take great care to drill straight and true.
25 PIECE SAE
LARGE TAP & DIE SET
60%
7/16"
31/64"
33/64"
35/64"
37/64"
21/32"
11/16"
25/32"
13/16"
57/64"
15/16"
Page 2
75%
-
15/32"
1/2"
17/32"
9/16"
41/64"
-
49/64"
51/64"
7/8"
59/64"
To properly cut internal
threads you will need:
• Tap of correct size
• Tap wrench
• Drill bit of correct size
• Lubricating (cutting) oil
• Material
25STDS
Decimal Inches
0.4375
0.4844
0.5156
0.5469
0.5781
0.6563
0.6875
0.7813
0.8125
0.8906
0.9375
90°
1911358-14
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