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303644 — O-RING

✓ Government record, cited
3M · ORING SEAL
PRODUCT OVERVIEW

303644: O-RING.

ARMR200 Series Anti-Reflection Matt Removable Display Protection Film - Protects screen - Reduces unwanted reflections and increases contrast for improved clarity and readability - Multi-layer construction includes an anti-reflective element and an easy-to-clean surface that minimises fingerprints - Robust enough to protect the underlying substrate, yet thin enough to have a minimum effect on touch screen sensitivity (not suitable however for capacitive touch displays) - Easy to apply and remove with no adhesive residue This part is cataloged in the U.S. Government catalog under NSN 5331-01-020-4540, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
303644
NSN: 5331-01-020-4540
FSC: 5331 — O-ring
CAGE: 26337 — PARKER-HANNIFIN CORPORATION DIV HYDRAULIC ACCUMULATOR DIVISION (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
center_hole_diameter3.085 INCHES MINIMUM AND 3.115 INCHES MAXIMUM IN
cross-sectional_height0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
NSN5331-01-020-4540
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 303644 MFR: 3M ⚠ 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
KEY FEATURES
•
CROSS-SECTIONAL HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 3.085 INCHES MINIMUM AND 3.115 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
CENTER HOLE DIAMETER3.085 INCHES MINIMUM AND 3.115 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES 2
S1400-41CReference document
Same NSN cross-reference
Reference document — Secondary reference
S1400-41MILG22050Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 303644?
303644 is a O-RING manufactured by 3M.
What parts can replace 303644?
There are 2 known substitutes for 303644: S1400-41C, S1400-41MILG22050. Substitute compatibility should be verified for your specific system.
What is the NSN for 303644?
303644 is cataloged in the U.S. Government catalog under NSN 5331-01-020-4540. 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.