Vibration Resistant

Eccentric Lock Washer™

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

"SWAS-EW"

 

 

 

 

<<Material/Finish>>

SWAS-EW
Receiving Washer	SUS304
Eccentric Washer	SUS304

 

 

 

 

 

 

 

 

 

 

<<Application>>

Vibration resistant treatment

 

 

<<Characteristics>>

• 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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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>>

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

 

<<Inserting method>>

1. Please set the convex side of the eccentric washer upward. (Fig.1)
2. Please set the concave of the receiving washer upward. (Fig. 2)
3. Please tighten till Hex. nut hits lightly the receiving washer. (Fig. 3)
4. Please tighten after your confirming that receiving washer and Hex. Nut are fitting together. (Fig. 4)