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Technical Data Sheet
PartsTable / COMPONENT / B-FF-8
B-FF-8 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT 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: 0.633 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN, overall_diameter: 0.890 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-186-1380, 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-8
NSN: 5310-00-186-1380
FSC: 5310
CAGE: 02697 — PARKER-HANNIFIN CORP DIV O-RING DIVISION (USA)
SPECIFICATIONS
materialLEATHER OVERALL
thickness0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
hole_diameter0.633 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN
overall_diameter0.890 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
minimum_tensile_strength2500 POUNDS PER SQUARE INCH LBS
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-186-1380
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B-FF-8 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HOLE DIAMETER: 0.633 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: LEATHER OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
THICKNESS: 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
•
MINIMUM TENSILE STRENGTH: 2500 POUNDS PER SQUARE INCH LBS
•
OVERALL DIAMETER: 0.890 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.633 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN
CENTER HOLE SHAPE STYLEROUND
MATERIALLEATHER OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH2500 POUNDS PER SQUARE INCH LBS
OVERALL DIAMETER0.890 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
41045Interchangeable
interchangeable cross-reference
interchangeable
160164-1Interchangeable
interchangeable cross-reference
interchangeable
17768Interchangeable
interchangeable cross-reference
interchangeable
F567Interchangeable
interchangeable cross-reference
interchangeable
12838Interchangeable
interchangeable cross-reference
interchangeable
FD567Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-FF-8?
B-FF-8 is a WASHER,FLAT.
What parts can replace B-FF-8?
There are 22 known substitutes for B-FF-8: 41045, 160164-1, 17768 and 19 more. Substitute compatibility should be verified for your specific system.
Is B-FF-8 still available?
B-FF-8 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026