KATO LockOne

KATO LockOne®

A Superior Locking Force

KATO’s NEW LockOne is a revolutionary positive locking product designed to prevent a standard nut from loosening under vibration. Upon tightening, the LockOne coils stretch, providing superior locking force. Unlike nuts with nylon or locking compounds, the KATO LockOne does not degrade with each use. Due to the unique LockOne design, the assembly is FOD free. Save on assembly cost! No expensive replacement nuts! The LockOne lightweight design is perfect for use on weight sensitive applications.

LockOne prevents the nut from loosening from the bolt!

LockOne Specs


LockOne is tested in accordance with NAS3350 (National Aerospace Specification for impact type vibration test). LockOne can be easily substituted into existing designs. LockOne is reusable, does not degrade with each cycle.

Easy Assembly

KATO’s LockOne is fast and easy to install. No locking compounds to apply. A standard dodecagonal (12-Point) socket installs the LockOne at the same time as the nut, minimizing installation time. LockOne is adjustable and removable after installation with the same 12-point socket.

Made for the Environment

KATO’s LockOne is designed for harsh environments, without using any hazardous chemical coatings. Made from 304 Stainless Steel WPB, the LockOne is naturally corrosion resistant.

Design and Assembly Information

Designing in LockOne couldn’t be easier! Simply account for an extra three threads to the bolt length. That’s it! It’s compact nature allows for ease of use in designs with weight restrictions and maintenance schedules. When using any fastener with a degrading locking feature such as a locking compound or nylon built into the nut, replacements are needed during any maintenance as they can only be used once. With LockOne, this positive locking feature can be simply removed and reused. No extra stock needed!

KATO 3D-LockOne
KATO 3D-LockOne
KATO 3D-LockOne

Sectioned view of LockOne Shown.

Installation is Easy!

KATO LockOne

Simply load the LockOne into the 12-Point socket.

KATO LockOne

Load the standard nut on top of the LockOne.

KATO LockOne

Tighten as normal.

KATO LockOne

If there is a gap between the LockOne and the nut, simply tighten the LockOne until it is flush with the nut.

Part Numbers

Example of a KATO LockOne part number:

KLO M - 4

   1    2   3

Tool Type
Thread Designation
Size Designation
KLO - KATO LockOne C - Coarse1
F - Fine1
M - Metric
See Table

Please Note:

  1. Contact KATO for unified sizes.
Thread Size KATO Part Number


All dimensions are for reference only.

LockOne Specs
KATO Part Number Technical Data Weight
KLOM-471.4.50.350.24 g
KLOM-581.6.60.400.24 g
KLOM-6102.0.70.500.45 g
KLOM-8132.5.88.630.95 g
KLOM-10173.01.05.751.79 g
KLOM-12193.51.23.882.83 g
KLOM-16244.01.401.004.78 g
KLOM-20305.01.751.259.39 g
KLOM-22325.01.751.2510.12 g
KLOM-24266.02.101.5016.21 g
Bolt Pitch


Cross Section Shown. LockOne sits directly at the Pitch ∅ with both axial and radial forces.

Comparison Chart

Easy Installations Re-Usability Single Component High Vibration Strength Low Price Non-Destructive
Castellated Nuts
Castellated Nut
Nylon Nut
Nylon Nuts
Pin-Lock Nut
Pin-Lock Nut
Jam Nut
Jam Nut
Serrated Face Nut
Serrated Face Nut
Custom Lock Nut
Locking Compound
Locking Compond