Lockwashers Thread-Rite Screw Products

LOCK WASHERS

ITW Shakeproof is the largest, most diversely and uniquely tooled producer of tooth washers in the world, and these time-proven washers are the finest anti-vibration, anti-loosening mechanical fastening devices available. Economical standard lock washers, in a variety of styles, fit all popular screw diameters and accommodate a wide range of hole configurations, including countersunk and large holes. These resilient washers stand up to high torques and heavy loads.

Rattles, slippage and loose assemblies are major causes of customer complaints. Put some teeth in your quality programs and in your assemblies - Shakeproof Lock Washer teeth!

The twisted teeth on the Shakeproof Lock Washer compress as torque is applied to the fastening. A strong spring reaction is set up as the specially heat treated teeth seek to return to their fully twisted position. These unique teeth make a significant contribution to the integrity of the assembly.

The powerful spring reaction of the teeth work to maintain needed fastening tension.
The powerful teeth react instantly to any loosening force, setting up a strut action that is in direct opposition to the loosening rotation of the fastener.
. The flexed teeth absorb shock and vibration.
The spring reaction of the teeth work to absorb high torque and prevent slipping.

Shakeproof Lock Washers perform consistently, time after time, because they are made to the exceptionally high quality standards for which Shakeproof is so well known.


EXTERNAL TYPE: Should be used wherever possible, as the tapered, twisted teeth are on the largest radius to provide maximum torsional resistance. Best used with a fastener having a round, pan, binding or other head large enough to make contact with the washer teeth. External tooth washers are also available with left hand or alternately twisted teeth for special applications.

INTERNAL TYPE: Recommended for use with smaller head screws such as fillisters. Also recommended for applications where it is best to hide the teeth either for appearance or to prevent scratching or snagging.

HEAVY DUTY INTERNAL TYPE: Recommended for use with heavy bolts and nuts, and with heat treated bolts usually on castings and heavy machinery or equipment.

FOLDED RIM TYPE WASHERS: A modification of the standard Shakeproof External Tooth Lock Washer with the folded rim providing additional body strength to resist extreme fastening stresses.

COUNTERSUNK TYPE For use with flat or oval head screws having either 82º or 100º countersunk angles. Also available with internal teeth or flanged to provide locking action with concealed teeth.

EXTERNAL-INTERNAL TYPE Should be used where a larger bearing surface is desired, for oversized or elongated holes or as an insert between two adjustable pieces where the adjustment - either rotational or longitudinal - must be maintained after the original setting. Because of the added biting teeth, External-Internal lock washers are ideal for electrical bonding purposes.

PYRAMIDAL TYPE Recommended for applications requiring very high tightening torques. This type has a unique design which provides both locking teeth and rigidity, yet is resilient under heavy loads. Both square and hexagonal shapes are available.

DOME TYPE Available with either plain or toothed periphery. Because they distribute the load over a wide area, Dome Type washers are recommended for use with soft or thin materials where considerable force is needed for holding.

Also recommended for oversize or elongated holes. Plain periphery washers are recommended where surfaces should not be marred by biting teeth. Toothed periphery washers should be used where additional protection against shifting is required

DISHED TYPE: Available with plain or toothed periphery. Recommended for the same applications and purposes as Dome Type washers, but should be used where resiliency rather than rigidity is most important.

Both Dome and dished Types are crowned or arched to support the internal teeth so they can lock into the bolt head or nut. Flat rim Dished Type Lock Washers are a variation of the plain periphery and are ideal for plastic surfaces, electrical components and similar applications. Has small O.D. for limited space



WIDE RIM TYPE: Recommended for use with large diameter screw and bolt heads and for spanning oversize holes where extreme torques are not required



.ALTERNATE TWISTED TOOTH TYPE: Provide both clockwise and counter clockwise locking action. Resists rotation in either direction

NARROW RIM TYPE: Ideal for small head screws and for applications where appearance or O.D. clearance are determining factors



PIPE LOCK WASHERS: Made especially for locking nuts having an extreme internal diameter in relation to the O.D. Examples are found in lamp and instrument board assemblies

TYPE "B" TOOTH FORM: This alternative tooth form is available in most styles and types. Preferred by some for heavy duty applications



SEMS PREASSEMBLED SCREWS AND WASHERS:Most of the washers shown in this catalog are available preassembled to many types of screws in Sems assemblies. For more information on washers for preassembly contact your authorized Shakeproof distributor or a Shakeproof representative.