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We apply new thread technology for mounting pulleys, gears or sprockets

onto a keyless shaft.


Our patented self locking vibration resistant nuts and bolts uses asymmetric threads to self lock.


 Mounts keyless

pulleys, gears on shaft



Torksleeve M



 Significant Benefit

- A compact, light weight design

- Easy mounting/dismounting

- Infinite axial/radial positioning

- Mounts over flats

- Low cost

- Reusable

- Made in USA

 Product Certification

 Call today for a quote



Torksleeve A 2

 Locks in any position

on bolt or threaded shaft


Our goal at Asymmetric Fasteners is to provide state of the art fasteners that combine vibration resistance and self-locking technology with uncomplicated installation.

By design, AFI delivers self locking, vibration resistant nuts and bolts that do not require additional locking components, simplifying installation and creating cost effective solution for fastening needs, all without sacrificing reliability and effectiveness.

 Single sleeve

high torque transfer


 No additional locking

devices - free turning


  Two sets of 1/2 “ diameter nuts and bolts (our A-lock) were supplied to independent Laboratory  for the vibration test.  One set was made from 18-8 stainless steel and one set was made from low carbon steel.  The steel bar (6.0” long x 1.0” wide x ½” thick) was attached at one end to a shaker arm, end other end of the bar was free hanging (see fig.).  The nut was torqued to 45 ft/lb.
The duration of the random vibration test was one hour for each X, Y and Z axis, and subjected to a frequency ranging from 20 to 2000 Hz as shown in the data sheet below.
The test results showed no visual anomalies noted on units.  The certification was issued per specification
MIL-STD-810D, Meth. 514.3, Proc. 1 Cat. 4

Torksleeve A

A compact and light weight design mounts keyless gears, pulleys, sprockets onto a shaft.

Infinite adjustment

Asymmetric Fasteners Inc.

 A Torksleeve products allows a mechanism designer to choose the exact model and size for the application.  The Torksleeve fastener selected to position motion component, such as pulleys or gears, is critical to successful operation.  These patented keyless shaft locking devices, because of their unique design, produce accurate and concentric mounting, offers uniform locking pressure, easy mounting and low cost.

 The most elegant fasteners for mounting keyless gears, pulleys, sprockets onto a shaft

 Excellent for mounting

hubless pulleys, gears