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Technical Data Sheet
21685T16 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER, overall_width: 5.5 INCHES NOMINAL IN, overall_height: 3.75 INCHES NOMINAL IN, overall_length: 7.5 INCHES NOMINAL IN, special_features: ITEM HAS 4 COUNTERBORED MOUNTING HOLES, mounting_hole_diameter: 0.50 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-562-0904, 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
21685T16
NSN: 5340-01-562-0904
FSC: 5340
CAGE: 3A054 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialRUBBER
overall_width5.5 INCHES NOMINAL IN
overall_height3.75 INCHES NOMINAL IN
overall_length7.5 INCHES NOMINAL IN
special_featuresITEM HAS 4 COUNTERBORED MOUNTING HOLES
mounting_hole_diameter0.50 INCHES NOMINAL IN
end_item_identification016158699
first_counterbore_diameter1.25 INCHES NOMINAL IN
material_document_and_classificationASTM D2000 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyBUMPER,BAP STOP
NSN5340-01-562-0904
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21685T16 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
CRITICALITY CODE JUSTIFICATION: ZZZY
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
TECHNICAL CHARACTERISTICS (FLIS)
CRITICALITY CODE JUSTIFICATIONZZZY
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSMATERIAL WILL BE IN ACCORDANCE WITH NAVICP ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
3B7733Interchangeable
interchangeable cross-reference
interchangeable
GM45N2046Interchangeable
interchangeable cross-reference
interchangeable
CS4730-0109-6BInterchangeable
interchangeable cross-reference
interchangeable
105406Interchangeable
interchangeable cross-reference
interchangeable
5GG-4-40-C2E-2-1Interchangeable
interchangeable cross-reference
interchangeable
105564Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21685T16?
21685T16 is a BUMPER.
What parts can replace 21685T16?
There are 9 known substitutes for 21685T16: 3B7733, GM45N2046, CS4730-0109-6B and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21685T16?
21685T16 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-562-0904. This indicates validated use in U.S. government and defense supply chains.
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