The Knob, cataloged under National Stock Number 5355-01-048-9911, is classified within Federal Supply Class 5355 (Knobs and Pointers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Commercial. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5355-01-048-9911 |
| Primary Part Number | BACK20B1 |
| Item Name | Knob |
| FSC / FSG | 5355 / 53 — Knobs and Pointers |
| Manufacturer | The Boeing Company Div Commercial |
| Status | ACTIVE |
| Shank Diameter | 0.310 INCHES NOMINAL IN |
| Shaft Accommodation Style | ROUND |
| Overall Thickness | 0.650 INCHES NOMINAL IN |
| Style Designator | CROWN |
| Outside Diameter | 0.750 INCHES NOMINAL IN |
| Nominal Thread Size | 0.138 INCHES RECEPTACLE IN |
| Inside Diameter | 0.138 INCHES NOMINAL IN |
| Shank Style | CONCAVE |
| Gripping Surface Condition | SMOOTH |
| Color | BLACK |
| Thread Quantity Per Inch | 32 RECEPTACLE |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) RECEPTACLE |
| Attachment Method | SCREW ON |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| BACK20B1 PRIMARY | The Boeing Company Div Commercial (USA) |
| Reference | Meaning |
|---|---|
| BACK20B1 | 5/9 Secondary reference U.S. Government activity |
NSN 5355-01-048-9911 is a Knob, manufactured by The Boeing Company Div Commercial, classified under FSC 5355, Knobs and Pointers. Status: active.
NSN 5355-01-048-9911 has 1 manufacturer part number on file: BACK20B1 (The Boeing Company Div Commercial).
Key specifications for BACK20B1: Shank Diameter: 0.310 INCHES NOMINAL IN; Shaft Accommodation Style: ROUND; Overall Thickness: 0.650 INCHES NOMINAL IN; Style Designator: CROWN. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.