Steel Heavy-Vibration-Resistant Spring Lock Washer
Zinc-Plated, for 3/8" Screw Size, 0.402" ID, 0.877" OD
For Screw Size | 3/8" |
ID | 0.402" |
OD | 0.877" |
Thickness | 0.059" to 0.065" |
Overall Height | 0.108" |
Serration Location | Top |
Finish | Zinc Plated |
Hardness | Rockwell C40 |
Lock Washer Type | Spring |
Material | Steel |
Performance | Heavy Vibration Resistant, Reusable |
System of Measurement | Inch |
Washer Type | Conical |
Country of Origin | United States |
DFARS Compliance | Specialty Metals COTS-Exempt |
Export Control Classification Number (ECCN) | EAR99 |
REACH Compliance | REACH (EC 1907/2006) (06/25/2025, 250 SVHC) Compliant |
RoHS Compliance | RoHS 3 (2015/863/EU) Compliant |
Schedule B Number | 731821.0000 |
U.S.–Mexico–Canada Agreement (USMCA) Qualifying | No |
With a grip that's second only to wedge lock, these washers stop nuts and screws from wiggling loose under constant, vigorous vibration. They are ideal for engines, turbines, generators, and other heavy duty equipment. Similar to a spring, they flatten under pressure to add tension between mating surfaces. As long as the washers aren't deformed or otherwise damaged, you can reuse them indefinitely without losing locking strength. Also known as conical washers and Belleville washers.
Stack multiple washers in the same direction to double or triple how much weight they can bear. Stack washers in opposite directions for better deflection, which means they compress further and withstand more shock and movement without loosening.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Top Serration—Adds friction for extra gripping power.
The information in this 3-D model is provided for reference only.