The Mounting Block, cataloged under National Stock Number 5340-01-100-4316, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Smiths Aerospace, Inc., Electronic Systems-Grand Rapids. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5340-01-100-4316 |
| Primary Part Number | 21348-1 |
| Item Name | Mounting Block |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Smiths Aerospace, Inc., Electronic Systems-Grand Rapids |
| Status | ACTIVE |
| General Characteristics Item Description | MATERIAL ALUMINUM ALLOY 2024-T351; FINISH CHEMICAL FILM MIL-C-5541 CL 1A; LG 2.500 IN. NOM; WIDTH 0.250 IN. NOM; 4 HOLES,1/4/0.250/-28 UNF-2B THRUC,SINK 82 DEG TO .31 DIA; 3 HOLES 4/0.112/-40 UNC-2B A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 21348-1 PRIMARY | Smiths Aerospace, Inc., Electronic Systems-Grand Rapids (USA) |
| Reference | Meaning |
|---|---|
| A21348-1 | 5/9 Secondary reference Smiths Aerospace, Inc., Electronic Systems-Grand Rapids |
NSN 5340-01-100-4316 is a Mounting Block, manufactured by Smiths Aerospace, Inc., Electronic Systems-Grand Rapids, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-100-4316 has 1 manufacturer part number on file: 21348-1 (Smiths Aerospace, Inc., Electronic Systems-Grand Rapids).
1 possible match (shared part number, not a government interchangeability claim): 1005-01-703-3712. Verify interchangeability with system specifications before substitution.
Key specifications for 21348-1: General Characteristics Item Description: MATERIAL ALUMINUM ALLOY 2024-T351; FINISH CHEMICAL FILM MIL-C-5541 CL 1A; LG 2.500 IN. NOM; WIDTH 0.250 IN. NOM; 4 HOLES,1/4/0.250/-28 UNF-2B THRUC,SINK 82 DEG TO .31 DIA; 3 HOLES 4/0.112/-40 UNC-2B A. 1 specification is 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.