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PartsTable / COMPONENT / FFW100C
FFW100C ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.318 INCHES NOMINAL IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 0.430 INCHES NOMINAL IN, special_features: ALTERNATE TOOTH TWIST, style_designator: FLAT INTERNAL TEETH. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-017-8627, 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
FFW100C
NSN: 5310-00-017-8627
FSC: 5310
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.318 INCHES NOMINAL IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.430 INCHES NOMINAL IN
special_featuresALTERNATE TOOTH TWIST
style_designatorFLAT INTERNAL TEETH
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
surface_treatmentCADMIUM OVERALL
material_thickness0.015 INCHES NOMINAL IN
end_item_identificationLOGISTICS SUPPORT VESSEL
nondefinitive_spec/std_data4 TYPE AND 1 STYLE AND 1 COMPOSITION
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-017-8627
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FFW100C · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
644858-7Interchangeable
interchangeable cross-reference
interchangeable
40D980Interchangeable
interchangeable cross-reference
interchangeable
92165A030Interchangeable
interchangeable cross-reference
interchangeable
MS35333-109Interchangeable
interchangeable cross-reference
interchangeable
FF-W-100CInterchangeable
interchangeable cross-reference
interchangeable
MS35333-108Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFW100C?
FFW100C is a WASHER,LOCK.
What parts can replace FFW100C?
There are 29 known substitutes for FFW100C: 644858-7, 40D980, 92165A030 and 26 more. Substitute compatibility should be verified for your specific system.
Is FFW100C still available?
FFW100C 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