Features an off-center parabolic ramp that creates a secondary spring system to increase both spring tension and load bearing capability. Provides greater resistance to both loosening and fatigue.

Hole Size	Inside Diameter Min.	Inside Diameter Max.	Outside Diameter Min.	Outside Diameter Max.	Free Height Min.	Free Height Max.	Thickness	Alternate Part Number	WCL Part Number
6	0.142	0.15	0.307	0.317	0.033	0.039	0.022	3533-06-02	RC-0142-0307-022
10	0.195	0.204	0.433	0.443	0.046	0.052	0.029	3533-10-02	RC-0195-0433-029
1/4	0.256	0.267	0.495	0.505	0.063	0.071	0.039	3533-14-02	RC-0256-0495-039
1/4	0.256	0.267	0.74	0.76	0.073	0.083	0.039	3533-14-03	RC-0256-0740-039
1/4	0.256	0.267	0.74	0.76	0.089	0.099	0.055	3533-14-07	RC-0256-0740-055
5/16	0.32	0.332	0.615	0.635	0.072	0.08	0.043	3533-18-02	RC-0320-0615-043
5/16	0.32	0.332	0.865	0.885	0.105	0.115	0.062	3533-18-07	RC-0320-0865-062
3/8	0.384	0.398	0.74	0.76	0.086	0.094	0.05	3533-20-02	RC-0384-0740-050
3/8	0.384	0.398	0.99	1.01	0.12	0.13	0.07	3533-20-07	RC-0384-0990-070
1/2	0.515	0.525	1.24	1.26	0.19	0.2	0.109	3533-24-07	RC-0515-1240-109
1/2	0.512	0.529	1.24	1.26	0.174	0.184	0.093	3533-24-12	RC-0512-1240-093
1/2	0.515	0.525	1.115	1.135	0.165	0.175	0.093	3533-24-13	RC-0515-1115-093