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GBF55 ✓ 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 length: 0.437 INCHES NOMINAL IN, material: STEEL OVERALL, thickness: 0.032 INCHES NOMINAL IN, hole_diameter: 0.202 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN, surface_treatment: ZINC OVERALL, width_across_flats: 0.437 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 5310-00-616-7581, 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
GBF55
NSN: 5310-00-616-7581
FSC: 5310
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
length0.437 INCHES NOMINAL IN
materialSTEEL OVERALL
thickness0.032 INCHES NOMINAL IN
hole_diameter0.202 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN
surface_treatmentZINC OVERALL
width_across_flats0.437 INCHES NOMINAL IN
peripheral_shape_styleRECTANGULAR
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-616-7581
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: GBF55 · 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
•
PERIPHERAL SHAPE STYLE: RECTANGULAR
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
LENGTH: 0.437 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
WIDTH ACROSS FLATS: 0.437 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.202 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
PERIPHERAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC OVERALL
LENGTH0.437 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
WIDTH ACROSS FLATS0.437 INCHES NOMINAL IN
HOLE DIAMETER0.202 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN
THICKNESS0.032 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
107-B-647Interchangeable
interchangeable cross-reference
interchangeable
599-148Interchangeable
interchangeable cross-reference
interchangeable
V30810008Interchangeable
interchangeable cross-reference
interchangeable
K55Interchangeable
interchangeable cross-reference
interchangeable
10055000028Interchangeable
interchangeable cross-reference
interchangeable
102191Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GBF55?
GBF55 is a WASHER,FLAT.
What parts can replace GBF55?
There are 14 known substitutes for GBF55: 107-B-647, 599-148, V30810008 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GBF55?
GBF55 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-616-7581. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026