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PartsTable / COMPONENT / 21SAF10B18PC6
21SAF10B18PC6 ✓ 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,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include nut_style: SLOTTED, HEXAGON, nut_height: 1.312 INCHES NOMINAL IN, thread_class: 4B, thread_series: UNS, thread_direction: RIGHT-HAND, width_across_flats: 1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM 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 5310-00-275-1916, 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
21SAF10B18PC6
NSN: 5310-00-275-1916
FSC: 5310
CAGE: 82796 — COLTEC INDUSTRIES INC. DBA FAIRBANKS MORSE ENGINE DIV FAIRBANKS MORSE ENGINE (USA)
SPECIFICATIONS
nut_styleSLOTTED, HEXAGON
nut_height1.312 INCHES NOMINAL IN
thread_class4B
thread_seriesUNS
thread_directionRIGHT-HAND
width_across_flats1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
nominal_thread_size1.000 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch14
NSN5310-00-275-1916
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21SAF10B18PC6 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SERIES: UNS
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
THREAD QUANTITY PER INCH: 14
•
NUT STYLE: SLOTTED, HEXAGON
•
WIDTH ACROSS FLATS: 1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
•
NUT HEIGHT: 1.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD SERIESUNS
NOMINAL THREAD SIZE1.000 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD QUANTITY PER INCH14
NUT STYLESLOTTED, HEXAGON
WIDTH ACROSS FLATS1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
NUT HEIGHT1.312 INCHES NOMINAL IN
THREAD CLASS4B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
81328502Interchangeable
interchangeable cross-reference
interchangeable
428699Interchangeable
interchangeable cross-reference
interchangeable
7375688Interchangeable
interchangeable cross-reference
interchangeable
50534Interchangeable
interchangeable cross-reference
interchangeable
FFN836GPBTYPE2STYLE2Interchangeable
interchangeable cross-reference
interchangeable
13ADD805APC12Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21SAF10B18PC6?
21SAF10B18PC6 is a NUT,PLAIN,SLOTTED,HEXAGON.
What parts can replace 21SAF10B18PC6?
There are 14 known substitutes for 21SAF10B18PC6: 81328502, 428699, 7375688 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21SAF10B18PC6?
21SAF10B18PC6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-275-1916. 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