- to mount filters or other attachments to lenses with various mounting sizes<br>- precision metal ring with matt black surface<br>- warning: small filters on large lenses can result vignetting - especially in strong light or wide angles This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2930-00-139-4393, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.
Verify compatibility with your specific system configuration before ordering.
| swivel | NOT INCLUDED |
| armrest | INCLUDED |
| backrest | INCLUDED |
| material | RUBBER FLUOROCARBON CLASS FPM SEALING ELEMENT |
| seat_type | FIXED CUSHION |
| thickness | 0.268 INCHES NOMINAL IN |
| case_style | RECESSED |
| seal_width | 0.313 INCHES NOMINAL IN |
| body_length | 4.500 INCHES NOMINAL IN |
| design_type | PARTIAL |
| foldability | NONFOLDABLE |
| adjustability | NONADJUSTABLE |
| NSN | 2930-00-139-4393 |