PartsTable
Technical Data Sheet
B-FF-4 ✓ 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, thickness: 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN, hole_diameter: 0.3985 INCHES MINIMUM AND 0.4135 INCHES MAXIMUM IN, overall_diameter: 0.640 INCHES NOMINAL IN, peripheral_diameter: 0.577 INCHES NOMINAL IN, center_hole_diameter: 0.3355 INCHES MINIMUM AND 0.3505 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-186-4947, 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-4
NSN: 5330-00-186-4947
FSC: 5330
CAGE: 01666 — NATIONAL STARCH AND CHEMICAL CORP BONDMASTER DIV (USA)
SPECIFICATIONS
materialLEATHER OVERALL
thickness0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
hole_diameter0.3985 INCHES MINIMUM AND 0.4135 INCHES MAXIMUM IN
overall_diameter0.640 INCHES NOMINAL IN
peripheral_diameter0.577 INCHES NOMINAL IN
center_hole_diameter0.3355 INCHES MINIMUM AND 0.3505 INCHES MAXIMUM IN
cross-sectional_height0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationMIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-186-4947
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B-FF-4 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
PERIPHERAL DIAMETER: 0.577 INCHES NOMINAL IN
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
CENTER HOLE DIAMETER: 0.3355 INCHES MINIMUM AND 0.3505 INCHES MAXIMUM IN
MATERIAL: LEATHER CATTLEHIDE OVERALL
CROSS-SECTIONAL SHAPE STYLE: SQUARE/RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
PERIPHERAL DIAMETER0.577 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-W-5521 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL HEIGHT0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
CENTER HOLE DIAMETER0.3355 INCHES MINIMUM AND 0.3505 INCHES MAXIMUM IN
MATERIALLEATHER CATTLEHIDE OVERALL
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
17764Interchangeable
interchangeable cross-reference
interchangeable
1776-5Interchangeable
interchangeable cross-reference
interchangeable
1283-5Interchangeable
interchangeable cross-reference
interchangeable
757 283Interchangeable
interchangeable cross-reference
interchangeable
3-4X77-545Interchangeable
interchangeable cross-reference
interchangeable
1283-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-FF-4?
B-FF-4 is a RETAINER,PACKING.
What parts can replace B-FF-4?
There are 21 known substitutes for B-FF-4: 17764, 1776-5, 1283-5 and 18 more. Substitute compatibility should be verified for your specific system.
Is B-FF-4 still available?
B-FF-4 is currently cancelled.
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