Military Standards - Retainer Back-up Ring - MS28774-110
Genuine OEM Part
Description: Retainer Back-up Ring
Part Number: MS28774-110
Alternate Part Numbers: MIL-R-8791/1, V3C10333-4, V3C10333-4CP, MS28774-110CP
Product Overview
An item designed to fit over a packing gland by mating with a surface of a second part which together will retain into a narrow groove or confined space the packing, preformed or o-ring, or an item designed to fit over a rod or shaft, to mate with a stuffing box to confine packing material. It may function as a static or dynamic seal retainer with the packing located on, around, or in the centerline direction of the rod or shaft axis. It may have holes or joints for mounting, be threaded, or unthreaded. See also packing nut and packing nut, stuffing tube.
Item Specification
| Cross-Sectional Shape Style | Square/rectangular | |
| Cross-Sectional Height | 0.045 inches minimum and 0.052 inches maximum | |
| Center Hole Diameter | 0.389 inches minimum and 0.391 inches maximum | |
| Peripheral Diameter | 0.560 inches minimum and 0.564 inches maximum | |
| Joint Type | Scarf-peripheral retainer | |
| Cut Type | Diagonal overall | |
| Criticality Code Justification | ZZZW | |
| Material | Plastic polytetrafluoroethylene overall | |
| Material Document and Classification | MIL-R-8791 mil spec single material response overall | |
| Departure from Cited Document | Cleaning, packaging, and marking iaw MIL-STD-1330D |
Fits in
- Bombardier Learjet 55
- Textron Aviation Cessna 510 Citation Mustang
- Textron Aviation Hawker 900XP