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Technical Data Sheet
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4645A — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4645A: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5340-01-162-0407, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
4645A
NSN: 5340-01-162-0407
FSC: 5340 — Hardware, Commercial
CAGE: 83330 — DIALIGHT CORPORATION (USA)
SPECIFICATIONS
Part Number4645A
NSN5340-01-162-0407
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4645A MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 7
5248-878Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
9531B-B-0632-4Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
61010-R-B-.105-9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
145-01-BR-632-2-TSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
15-400122Reference document
Same NSN cross-reference
Reference document — Secondary reference
1560BSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4645A?
4645A is a STANDOFF,THREADED,SPACING.
What parts can replace 4645A?
There are 7 known substitutes for 4645A: 5248-878, 9531B-B-0632-4, 61010-R-B-.105-9 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4645A?
4645A is cataloged in the U.S. Government catalog under NSN 5340-01-162-0407. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.