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PartsTable / COMPONENT / FF-N-836 TY1ST3GRC
FF-N-836 TY1ST3GRC ✓ 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 NUT,PLAIN,SQUARE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SQUARE, nut_height: 0.188 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-639-1089, 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
FF-N-836 TY1ST3GRC
NSN: 5310-00-639-1089
FSC: 5310
CAGE: 80244 — GENERAL SERVICES ADMINISTRATION FEDERAL SUPPLY SERVICE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.188 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.438 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeFLAT
thread_quantity_per_inch20
nondefinitive_spec/std_data1 TYPE AND 3 STYLE AND C GRADE
NSN5310-00-639-1089
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FF-N-836 TY1ST3GRC · 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
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 20
•
BEARING SURFACE TYPE: FLAT
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NUT HEIGHT: 0.188 INCHES NOMINAL IN
•
NUT STYLE: SQUARE
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
THREAD QUANTITY PER INCH20
BEARING SURFACE TYPEFLAT
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NUT HEIGHT0.188 INCHES NOMINAL IN
NUT STYLESQUARE
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 3 STYLE AND C GRADE
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
651543Interchangeable
interchangeable cross-reference
interchangeable
140-17Interchangeable
interchangeable cross-reference
interchangeable
15788Interchangeable
interchangeable cross-reference
interchangeable
7620118Interchangeable
interchangeable cross-reference
interchangeable
S26Interchangeable
interchangeable cross-reference
interchangeable
914-49Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-N-836 TY1ST3GRC?
FF-N-836 TY1ST3GRC is a NUT,PLAIN,SQUARE.
What parts can replace FF-N-836 TY1ST3GRC?
There are 18 known substitutes for FF-N-836 TY1ST3GRC: 651543, 140-17, 15788 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FF-N-836 TY1ST3GRC?
FF-N-836 TY1ST3GRC is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-639-1089. 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