• Special Screws
  • Washers・Insert

Eccentric Lock Washer™


  • Vibration resistant treatment




Unit : mm

Part Number Nominal D d B C t1 t2 t Reference tightening torque
Qty per pack Mass
SWAS-6-EW 6 12 6.05 11.6 13.3 2.65 2.9 3.9 10 100 1.5 102.34 CAD Cart
SWAS-8-EW 8 17 8.1 15 17.3 3.3 3.9 5.1 28 100 3.5 135.24 CAD Cart
SWAS-10-EW 10 21 10.2 19.8 22.8 4.05 4.8 6.2 55 100 7.2 182.85 CAD Cart
SWAS-12-EW 12 24 12.2 22 25.4 4.5 6 7.5 90 100 11 280.34 CAD Cart

No products fulfill the conditions above.

We regret to inform you that no products fulfill the conditions you have entered.
Please change the values you have entered and search once again.

Nabeya Bi-tech Kaisha offers customized products in accordance with your needs.
Please feel free to contact us via the inquiry form.

Nabeya Bi-tech Kaisha
Customer Service

Please enter questions about customization and other product-related inquiries here.

Find the inquiry form here

Dimension Drawing

SWAS-EWEccentric Lock Washer™寸法図

Eccentric Lock Washer TM Comparison test: Anti loosening performance ※without sound

Related Services


Receiving Washer SUS304
Eccentric Washer SUS304


Vibration resistant treatment


  • Vibration resistant treatment effect can be achieved simply by using commercially available hexagon nuts.
  • Hexagon nuts can be tightened by hand until tightening force applies, for simple mounting.
  • Use the receiving washer and eccentric washer as a set.
  • Passes NAS-type vibration tests (NAS3350).
  • Vibration resistant treatment effect has also been confirmed with the Junker test.

SWAS-EWEccentric Lock Washer™

Test conditions

Bolt size: M10-40

Distance between washer surfaces: 24mm

Amplitude: ±0.43mm

Vibration: 3.3Hz

Test time: 180 sec

Precautions for Use

  • Dedicated for hexagon nuts. Do not use on head side of hexagon head bolts.
  • After tightening, use bolts with length sufficient to ensure screw thread pitches of 3 or more extending beyond the hexagon nuts.
  • Do not use with other washers such as plain washers.
  • When using half-thread bolts, confirm that the eccentric washer is in the screw thread part.
  • Bolt damage may ensue due to product properties.

Product List

Click here to see Washers・Insert

Click here to see Special Screws