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3648T21 — BUCKLE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3648T21: BUCKLE.

The BUCKLE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, special_features: 300 SERIES SS. SEW-ON BUCKLE.

350LB WORK LOAD LIMIT. LBS, buckle_style_designator: RATCHET, end_item_identification: AN/TPN-31(V)7, strap_accommodation_width: 1.00 INCHES NOMINAL IN, part_name_assigned_by_controlling_agency: BUCKLE,RACHET. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-633-3452, 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
3648T21
NSN: 5340-01-633-3452
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
special_features300 SERIES SS. SEW-ON BUCKLE. 350LB WORK LOAD LIMIT. LBS
buckle_style_designatorRATCHET
end_item_identificationAN/TPN-31(V)7
strap_accommodation_width1.00 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyBUCKLE,RACHET
NSN5340-01-633-3452
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3648T21 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
KEY FEATURES
•
BUCKLE STYLE DESIGNATOR: RATCHET
•
STRAP ACCOMMODATION WIDTH: 1.00 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
BUCKLE STYLE DESIGNATORRATCHET
STRAP ACCOMMODATION WIDTH1.00 INCHES NOMINAL IN
SPECIAL FEATURES300 SERIES SS. SEW-ON BUCKLE. 350LB WORK LOAD LIMIT. LBS
PART NAME ASSIGNED BY CONTROLLING AGENCYBUCKLE,RACHET
END ITEM IDENTIFICATIONAN/TPN-31(V)7
MATERIALSTEEL CORROSION RESISTING OVERALL
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

No substitute or cross-reference records for this part.

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 3648T21?
3648T21 is a BUCKLE.
What is the NSN for 3648T21?
3648T21 is cataloged in the U.S. Government catalog under NSN 5340-01-633-3452. 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.