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Technical Data Sheet
B-FF-5 ✓ 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 RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: LEATHER OVERALL, peripheral_diameter: 0.640 INCHES NOMINAL IN, center_hole_diameter: 0.3985 INCHES MINIMUM AND 0.4135 INCHES MAXIMUM IN, cross-sectional_height: 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN, cross-sectional_shape_style: SQUARE/RECTANGULAR, material_document_and_classification: MIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-752-8317, 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
B-FF-5
NSN: 5330-00-752-8317
FSC: 5330
CAGE: 02697 — PARKER-HANNIFIN CORP DIV O-RING DIVISION (USA)
SPECIFICATIONS
materialLEATHER OVERALL
peripheral_diameter0.640 INCHES NOMINAL IN
center_hole_diameter0.3985 INCHES MINIMUM AND 0.4135 INCHES MAXIMUM IN
cross-sectional_height0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
cross-sectional_shape_styleSQUARE/RECTANGULAR
material_document_and_classificationMIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-752-8317
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B-FF-5 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
CENTER HOLE DIAMETER: 0.3985 INCHES MINIMUM AND 0.4135 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLE: SQUARE/RECTANGULAR
MATERIAL: LEATHER OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL HEIGHT: 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
PERIPHERAL DIAMETER: 0.640 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER0.3985 INCHES MINIMUM AND 0.4135 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR
MATERIALLEATHER OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL HEIGHT0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
PERIPHERAL DIAMETER0.640 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
1776-5Interchangeable
interchangeable cross-reference
interchangeable
1283-5Interchangeable
interchangeable cross-reference
interchangeable
757 283Interchangeable
interchangeable cross-reference
interchangeable
2216LS-5Interchangeable
Same NIIN cross-reference
interchangeable
3-5X77-545Interchangeable
Same NIIN cross-reference
interchangeable
MS28777-5Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-FF-5?
B-FF-5 is a RETAINER,PACKING.
What parts can replace B-FF-5?
There are 6 known substitutes for B-FF-5: 1776-5, 1283-5, 757 283 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B-FF-5?
B-FF-5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-752-8317. This indicates validated use in U.S. government and defense supply chains.
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