Acme Industrial Company • 441 Maple Avenue • Carpentersville, IL 60110-1990 U.S.A.
NOTICE: Acme reserves the right to make changes without notice to our products and the information published about them. The
material presented here is for guidance only. The user assumes full responsibility for determining the suitability of our
products for a particular application. Requests for more information are welcome.
DISCLAIMER: SELLER MAKES NO OTHER WARRANTY WHATEVER, EXPRESSED OR IMPLIED AND ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED AND
EXCLUDED FROM ALL TRANSACTIONS AND SHALL NOT APPLY TO THE GOODS SOLD.
REMEDY: Our obligation is limited to the repair or replacement of defective parts or, at our option, the refund of the purchase price.
IN NO EVENT SHALL THE SELLER BE LIABLE FOR ANY INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES,
OR ANY DAMAGES IN THE NATURE OF PENALTIES.
Copyright © 2010, Acme Industrial Company All Rights Reserved
Acme Keylocking Threaded Inserts are used to
quickly repair stripped, damaged or worn out
threads with new stronger threads or for use in
original equipment. Acme Inserts are easy to
install and easy to remove. No special drills, taps
or pre-winder tools are required. The Keys are
driven down into the threads of the surrounding
base material, locking the insert in place.
• Solid, one-piece insert construction provides
a high degree of pull-out strength
• Keys supply a positive mechanical lock
• Easy installation and removal
• Installed with standard drills and taps
• No pre-winder tool required
• No tang to break-off
• May be used in many types of material
• MS/NAS Style inserts are produced to the
MS51830 NAS1395 NA0149
MS51831 NA0146 NA0150
MS51832 NA0147 NA0151
• Miniature, Lightweight, Heavy Duty, and
Extra Heavy Duty types with Non-locking
and Self-locking internal threads
• Full range of Inch and Metric sizes in coarse
or fine pitch threads
• Inserts for specific uses are available in
floating, blind end, solid, and cast-in
• Industrial Style inserts can be purchased in
bulk quantities or kits
Acme Industrial Company's
manufacturing facility is certified
to ISO: 9001:2008
Acme can manufacture Keylocking Threaded
Inserts to meet your special requirements.
Some of our capabilities are listed below:
Materials (Inserts) -
17-4 PH Stainless
Nitronic 60 Stainless
Materials (Keys) -
420 Stainless (Self-Broaching)
Acme Industrial Company • 441 Maple Avenue • Carpentersville, IL 60110-1990 U.S.A. 2
Installation & Removal
Keylocking Threaded Inserts
1) Drill with a standard tap
drill and countersink with
a standard 82° - 100°
counters ink (90° fo r
Miniature Inserts). Note:
Drill is oversize, see charts
for proper dimensions.
2) Tap new threads with a
standard tap. Note: See
charts for proper size and
3) Screw in the insert until
it is .010-.030 (.005-.015
for Miniature Inserts)
below the surface. Keys
locate the proper depth.
4) Drive keys down with
several hammer taps on the
proper installation tool.
5) Properly installed
If necessary, Acme Keylocking Inserts can be removed without
damage to the parent material:
1) Drill out material between keys and internal thread with a standard
drill to specified depth (refer to charts for proper size and depth).
2) Bend the keys inward and break off.
3) Remove the old insert using a screw extractor or similar device.
4) Install a replacement insert into the original tapped hole and drive