The Leaf,butt Hinge, cataloged under National Stock Number 5340-00-898-9637, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Alarin Aircraft Hinge, Inc. Dba Alarin Aircraft Hinge Inc Div Alarin Aircraft Hinge. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-00-898-9637 |
| Primary Part Number | BACH20AA-2-4 |
| Item Name | Leaf,butt Hinge |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Alarin Aircraft Hinge, Inc. Dba Alarin Aircraft Hinge Inc Div Alarin Aircraft Hinge |
| Status | ACTIVE |
| Reversible Feature | NOT INCLUDED |
| Knuckle Inside Diameter | 0.094 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN |
| Style Designator | BUTT BLANK |
| Pin Center to Body Edge Distance | 0.750 INCHES NOMINAL IN |
| Hinge Pin | NOT INCLUDED |
| Material Thickness | 0.044 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN |
| Knuckle Quantity | 4 |
| End Knuckle Length | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN |
| Knuckle Length | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN |
| Surface Treatment | CHROMATE OVERALL |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Knuckle Type | FRICTION |
| Performance Type | NOT RATED |
| 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 |
|---|---|
| BACH20AA-2-4 | Alarin Aircraft Hinge, Inc. Dba Alarin Aircraft Hinge Inc Div Alarin Aircraft Hinge (USA) |
| BACH20AA-2-4 | Bandy Manufacturing Llc (USA) |
| Reference | Meaning |
|---|---|
| BACH20AA-2-4 | 3/2 Design control — primary reference U.S. Government activity |
| BACH20AA-2-4 | 5/9 Secondary reference The Boeing Company |
| VS20101-2-4 | 5/9 Secondary reference The Boeing Company |
NSN 5340-00-898-9637 is a Leaf,butt Hinge, manufactured by Alarin Aircraft Hinge, Inc. Dba Alarin Aircraft Hinge Inc Div Alarin Aircraft Hinge, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-898-9637 has 2 manufacturer part numbers on file: BACH20AA-2-4 (Alarin Aircraft Hinge, Inc. Dba Alarin Aircraft Hinge Inc Div Alarin Aircraft Hinge), BACH20AA-2-4 (Bandy Manufacturing Llc).
Key specifications for BACH20AA-2-4: Reversible Feature: NOT INCLUDED; Knuckle Inside Diameter: 0.094 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN; Style Designator: BUTT BLANK; Overall Length: 9.990 INCHES MINIMUM AND 10.010 INCHES MAXIMUM IN. 13 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.