PartsTable
Technical Data Sheet
212-4K ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.422 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 5310-00-266-0387, 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
212-4K
NSN: 5310-00-266-0387
FSC: 5310
CAGE: 30760 — INGERSOLL RAND CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.422 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.813 INCHES NOMINAL IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch13
nondefinitive_spec/std_dataB GRADE AND 3 TYPE AND 3 STYLE
NSN5310-00-266-0387
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 212-4K · 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
MATERIAL: STEEL OVERALL
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE: 0.500 INCHES IN
THREAD QUANTITY PER INCH: 13
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
NONDEFINITIVE SPEC/STD DATA: B GRADE AND 3 TYPE AND 3 STYLE
THREAD DIRECTION: RIGHT-HAND
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD QUANTITY PER INCH13
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NONDEFINITIVE SPEC/STD DATAB GRADE AND 3 TYPE AND 3 STYLE
THREAD DIRECTIONRIGHT-HAND
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.813 INCHES NOMINAL IN
NUT HEIGHT0.422 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
123263Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEAInterchangeable
interchangeable cross-reference
interchangeable
X1719Interchangeable
interchangeable cross-reference
interchangeable
1719-1Interchangeable
interchangeable cross-reference
interchangeable
6000-T8Interchangeable
interchangeable cross-reference
interchangeable
10082594Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 212-4K?
212-4K is a NUT,PLAIN,HEXAGON.
What parts can replace 212-4K?
There are 15 known substitutes for 212-4K: 123263, FFB571TYPEA, X1719 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 212-4K?
212-4K is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-266-0387. This indicates validated use in U.S. government and defense supply chains.
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