TEC Series


TEC Series washers secure joints using tension rather than friction, as with traditional locking fasteners. TEC washers consist of a pair of washers with cams on one side and radial teeth on the other. The cam sides are joined together with a mild adhesive, and installed between the bolt head and/or nut and the joint material. During installation, the radial teeth cause one half of the washer to be seated to the bolt or nut, while the other half is seated to the joint material. When exposed to load or vibration, the bolt or nut will attempt to loosen. Since the radial teeth are seated to the mating surfaces, any movement in the loosening direction is forced between the cam. Because the cam angle (α) of the washers is greater than the thread pitch angle (β) of the bolt, a wedge effect is created by the cams, preventing the bolt or nut from rotating loose. Clamp load is maintained and the joint remains secure.

• Maintains clamp load in high vibration and load applications, thereby protecting the security of the joint

• Heavy duty, self-locking design

• For use with bolts up to Class 12.9, Grade 8

• Sizes from #8 (M4) to 1 3/8” (M36) in stock, available for immediate shipment

• Available in SCM435 Alloy Steel, 316L Stainless Steel, and 254 SMO Stainless Steel

• Provided in preassembled glued pairs

• Easy to install and remove with standard tools

• No retightening needed after installation

• Reusable - will not distort threads on bolt

• Vibration proof according to MIL-STD-1312-7/DIN 25201

• Lubrication does not impair the locking function of the washer

• Can be used reliably for joints with short clamp length

• Secures joints with high and low preloads

Each Sherex manufacturing facility is led by a team of seasoned engineering professionals charged with ensuring all products meet stringent quality requirements. Our facilities are certified to AS9100, ISO 9001:2008, ISO 14001, ISO/TS 16949, and ISO 17025, and utilize worldclass testing equipment, including tensile testing, accelerated corrosion salt spray testing machines, torque testing, standard measurement and gauging equipment, and optical sorting machines. TEC Series Washers are manufactured in a facility which strictly adheres to multiple ISO certification standards, and are thoroughly tested through the production cycle to ensure a high level of quality. All TEC Series products are fully RoHS compliant.

TEC Series wedge locking washers can be used to protect joint integrity in a wide variety of joint types, including:

Tapped Hole

Counter Bore

Stud Bolt

Slotted or Large Hole

Through Hole

Not Recommended


Agriculture & Construction Equipment

Challenge: When joints fail, performing corrective maintenance in the field - often requiring disassembling and reassembling complex machinery - is difficult and time consuming.
TEC Series Washers withstand the vibration and load associated with the agriculture and construction conditions, and hold joints secure.

Power Generation
Challenge: Due to windy conditions, bolted joints in these applications can experience severe vibration, causing joint failure in remote, hard-to-reach locations. Getting maintenance resources to remote locations to fix joints can be costly and dangerous.
TEC Series Washers withstand vibration due to windy conditions, eliminating the need for costly and dangerous repairs.

Gas & Oil

Challenge: Keeping joints secure in safety critical and harsh operating environments such as oil rigs can be dangerous, and joints are often found in hard-to-reach locations.
TEC Series Washers are created to withstand harsh operating environments, and will keep joints secure without needing replacements or extensive maintenance.


Challenge: In this harsh work environment, where equipment is subjected to extreme vibration, joints can fail, causing costly equipment downtime in remote locations.
TEC Series Washers' proven wedge locking technology protects joints under severe vibration, and can eliminate machine downtime

General Machinery Manufacturing

Challenge: In safety-critical environments such as roller-coasters, guaranteeing that joints do not fail is paramount; performing extensive maintenance and performance checks can be costly and inconvenient.
TEC Series Washers have been proven in Junker's tests to hold joints under severe vibration.

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