TEC Series® washers keep joints secure using tension, not friction as with traditional washers. TEC washers consist of a pair of washers with cams on one side and seizing ridges on the other. The cam sides are mated together with a mild adhesive, and installed between the bolt head or nut and the joint material.

As the bolt or nut is tightened, the seizing ridges cause one half of the washer to be seated to the bolt or nut, while the other half is seated to the joint material.



TEC Series Large Diameter Stainless Steel Washers have a larger outer diameter compared to standard TEC Series. They are ideal for use in large or slotted hole applications, with painted or soft contact surfaces, and with flanged head bolts or nuts.

Features and Benefits

Heavy-duty, self-locking design
For use with bolts up to Class 10.9, Grade 8
Available in sizes from #6 (M3.5) to 1-1/8" (M30)
Available in 316L Stainless Steel
Provided in preassembled glued pairs
Easy to install with standard tools
No retightening needed after installation
Reusable
Vibration proof according to MIL-STD-1312-7

Quality and Traceability

TEC Series® washers are thoroughly tested in several stages of production to ensure a high level of quality Sherex customers have come to expect. Each TEC Series washer is laser etched with a production lot number, part size, and coating to enable full traceability and easy identification.

TEC Series washers are manufactured in an ISO-Certified Facility and are fully RoHS compliant.

Installation.

To install the TEC Series Washer, place the preassembled pair between the nut or bolt and the joint material.

As the nut or bolt is tightened, one half of the washer pair will be seated to the joint material and the other half will be seated to the nut or bolt.

Install TEC Series washers using standard tools according to TEC Series Torque Guidelines. Retightening is not needed.

The use of lubricants is highly recommended when installing TEC Series washers. A high quality lubricant designed to prevent seizing will reduce friction during installation and improve the consistency of clamp load in joints.

Torque Guidelines

When installing TEC Series Washers in a common application, expect an increase in required torque over recommended installation torque to achieve proper clamp load and maximum joint safety. Due to varying installation conditions and customer specific applications, additional information and torque recommendations are available by contacting Engineering support at Sherex.

Removal and Reuse

Removing TEC Series washers requires no special tools or procedure. Simply untighten the joint in the normal method and check the washer to ensure cam faces disengage.

While TEC washers are usually reusable, washers should always be inspected for deformation or excessive wear before reuse. If washers appear deformed or heavily worn, discard and use a new pair.

Proven Applications

TEC Series Wedge Locking Washers outperform conventional, split-ring, and other style washers in a wide variety of high stress, corrosive, and vibration-sensitive applications including:
  • Agriculture Equipment
  • Automotive
  • Construction Equipment
  • Heavy Rail
  • Aerospace and Defense
  • Mining and Drilling Equipment
  • HVAC
  • Solar and Wind
  • Waste Management
Proven Results

TEC Series Wedge Locking Washers have been tested on a Junker Vibration Machine. The Junker test, considered the most severe vibration test for bolted joints, is used to determine the point at which a bolted joint loses its preload when subjected to shear loading due to transverse vibration.

When tested against a standard washer using the Junker test, TEC Series wedge locking washers remained secure under severe vibration conditions, while the standard washer loosened significantly.

Note
Custom materials and sizes available.
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Item #

Size

UNC

Metric

Inside Diameter (nom)

Outside Diameter (nom)

Thickness (nom)

Box Quantity

Carton Quantity

N/A M3.5 N/A #6 N/A M3.5 N/A 0.154 N/A 0.354 N/A 0.087 N/A 200 N/A 12,800
N/A M4 N/A #8 N/A M4 N/A 0.173 N/A 0.354 N/A 0.087 N/A 200 N/A 12,800
N/A M5 N/A #10 N/A M5 N/A 0.213 N/A 0.425 N/A 0.087 N/A 200 N/A 12,800
N/A M6 N/A N/A M6 N/A 0.256 N/A 0.531 N/A 0.079 N/A 200 N/A 12,800
N/A 1/4" N/A 1/4" N/A N/A 0.283 N/A 0.531 N/A 0.087 N/A 200 N/A 6,400
N/A M8-5/16" N/A 5/16" N/A M8 N/A 0.343 N/A 0.654 N/A 0.079 N/A 200 N/A 6,400
N/A 3/8" N/A 3/8" N/A N/A 0.406 N/A 0.827 N/A 0.079 N/A 200 N/A 3,200
N/A M10 N/A N/A M10 N/A 0.421 N/A 0.827 N/A 0.079 N/A 200 N/A 3,200
N/A M12 N/A N/A M12 N/A 0.512 N/A 1.000 N/A 0.118 N/A 100 N/A 3,200
N/A 1/2" N/A 1/2" N/A N/A 0.531 N/A 1.000 N/A 0.126 N/A 100 N/A 3,200
N/A M14-9/16" N/A 9/16" N/A M14 N/A 0.598 N/A 1.209 N/A 0.126 N/A 100 N/A 800
N/A M16-5/8" N/A 5/8" N/A M16 N/A 0.669 N/A 1.209 N/A 0.126 N/A 100 N/A 800
N/A M18 N/A N/A M18 N/A 0.768 N/A 1.358 N/A 0.126 N/A 100 N/A 800
N/A 3/4" N/A 3/4" N/A N/A 0.787 N/A 1.535 N/A 0.126 N/A 100 N/A 800
N/A M20 N/A N/A M20 N/A 0.843 N/A 1.535 N/A 0.126 N/A 100 N/A 800
N/A M22-7/8" N/A 7/8" N/A M22 N/A 0.921 N/A 1.654 N/A 0.126 N/A 50 N/A 400
N/A M24 N/A N/A M24 N/A 0.996 N/A 1.909 N/A 0.126 N/A 50 N/A 400
N/A 1" N/A 1" N/A N/A 1.098 N/A 1.909 N/A 0.126 N/A 50 N/A 400
N/A M27 N/A N/A M27 N/A 1.118 N/A 1.909 N/A 0.268 N/A 25 N/A 200
N/A M30-1 1/8" N/A 1 1/8" N/A M30 N/A 1.236 N/A 2.303 N/A 0.268 N/A 25 N/A 200
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