The Clamp,block, cataloged under National Stock Number 5340-01-391-5205, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems. Government technical data includes 15 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-391-5205 |
| Primary Part Number | 09A121-4 |
| Item Name | Clamp,block |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Mounting Hole Quantity | 33 |
| Clamping Hole Quantity | 44 |
| Distance From End to First Clamping Hole Center | 0.8100 INCHES NOMINAL IN |
| Block Height | 0.5700 INCHES NOMINAL0.5700 INCHES NOMINAL IN |
| Style Designator | RECTANGULAR |
| Material Document and Classification | -85052/1 MIL STD SINGLE MATERIAL RESPONSE AND -85449/1 MIL STD SINGLE MATERIAL RESPONSE |
| Mounting Hole Diameter | 0.3220 INCHES NOMINAL0.3220 INCHES NOMINAL IN |
| Clamping Hole Diameter | 0.3750 INCHES NOMINAL FOURTH HOLE IN |
| Clamping Hole Diameter | 0.5000 INCHES NOMINAL FIRST HOLE IN |
| Clamping Hole Diameter | 0.5000 INCHES NOMINAL THIRD HOLE IN |
| Clamping Hole Diameter | 0.6250 INCHES NOMINAL SECOND HOLE IN |
| Distance From Center of Mounting Hole to Edge Along the Width | 0.2500 INCHES NOMINAL0.2500 INCHES NOMINAL IN |
| Distance From End to First Mounting Hole Center | 0.3100 INCHES NOMINAL IN |
| Mounting Facility | UNTHREADED HOLE(S)UNTHREADED HOLE(S) |
| Material | RUBBER BUTADIENE NITRILE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 09A121-4 | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| Reference | Meaning |
|---|---|
| 09A121-4 | 5/9 Secondary reference U.S. Government activity |
| TA30300311-04 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-391-5205 is a Clamp,block, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-391-5205 has 1 manufacturer part number on file: 09A121-4 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems).
Key specifications for 09A121-4: Mounting Hole Quantity: 33; Overall Height: 1.1300 INCHES NOMINAL1.1300 INCHES NOMINAL IN; Clamping Hole Quantity: 44; Distance From End to First Clamping Hole Center: 0.8100 INCHES NOMINAL IN. 15 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.