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C641D20T — STRAP,RETAINING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

C641D20T: STRAP,RETAINING.

The STRAP,RETAINING is a the manufacturer industrial component. Key specifications include cushion: INCLUDED, material: ALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED, mounting_pad: NOT INCLUDED, overall_width: 0.750 INCHES NOMINAL IN, overall_length: 2.690 INCHES NOMINAL IN, style_designator: SADDLE ARCH. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-916-4753, 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
C641D20T
NSN: 5340-00-916-4753
FSC: 5340 — Hardware, Commercial
CAGE: 18076 — UMPCO, INC. DBA UMPCO INC (USA)
SPECIFICATIONS
cushionINCLUDED
materialALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED
mounting_padNOT INCLUDED
overall_width0.750 INCHES NOMINAL IN
overall_length2.690 INCHES NOMINAL IN
style_designatorSADDLE ARCH
material_thickness0.051 INCHES NOMINAL IN
mounting_hole_size0.197 INCHES NOMINAL IN
inside_diameter/arch_length1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM IN
material_document_and_classificationAMS 3651 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING
distance_between_mounting_hole_centers2.190 INCHES NOMINAL IN
distance_between_base_and_inside_of_arch1.325 INCHES MINIMUM AND 1.355 INCHES MAXIMUM IN
NSN5340-00-916-4753
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: C641D20T 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
•
MOUNTING HOLE SIZE: 0.197 INCHES NOMINAL IN
•
DISTANCE BETWEEN MOUNTING HOLE CENTERS: 2.190 INCHES NOMINAL IN
•
MOUNTING PAD: NOT INCLUDED
•
STYLE DESIGNATOR: SADDLE ARCH
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 3651 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING
TECHNICAL CHARACTERISTICS
MOUNTING HOLE SIZE0.197 INCHES NOMINAL IN
DISTANCE BETWEEN MOUNTING HOLE CENTERS2.190 INCHES NOMINAL IN
MOUNTING PADNOT INCLUDED
STYLE DESIGNATORSADDLE ARCH
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 3651 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/5, T4 FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED
OVERALL LENGTH2.690 INCHES NOMINAL IN
OVERALL WIDTH0.750 INCHES NOMINAL IN
MATERIAL THICKNESS0.051 INCHES NOMINAL IN
CUSHIONINCLUDED
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 1
978D20TReference document
Same NSN cross-reference
Reference document — Secondary reference
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 C641D20T?
C641D20T is a STRAP,RETAINING.
What parts can replace C641D20T?
There is 1 known substitute for C641D20T: 978D20T. Substitute compatibility should be verified for your specific system.
What is the NSN for C641D20T?
C641D20T is cataloged in the U.S. Government catalog under NSN 5340-00-916-4753. 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.