PartsTable
Technical Data Sheet
21581-01 ✓ 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,ROUND is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 510 OR COPPER ALLOY 524 OR COPPER ALLOY 544 OVERALL, nut_style: ROUND, nut_diameter: 0.625 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN, thread_class: 2B, nut_thickness: 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN, thread_series: UNF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-637-0534, 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
21581-01
NSN: 5310-00-637-0534
FSC: 5310
CAGE: 35351 — GE AVIATION SYSTEMS LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 510 OR COPPER ALLOY 524 OR COPPER ALLOY 544 OVERALL
nut_styleROUND
nut_diameter0.625 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
thread_class2B
nut_thickness0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
thread_seriesUNF
thread_directionRIGHT-HAND
drive_point_depth0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
drive_point_width0.047 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
drive_point_quantity2
thread_quantity_per_inch20
NSN5310-00-637-0534
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21581-01 · 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: COPPER ALLOY 510 OR COPPER ALLOY 524 OR COPPER ALLOY 544 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-750 FED SPEC ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD SIZE: 0.500 INCHES IN
THREAD SERIES: UNF
THREAD QUANTITY PER INCH: 20
NUT THICKNESS: 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
THREAD DIRECTION: RIGHT-HAND
DRIVE POINT DEPTH: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY 510 OR COPPER ALLOY 524 OR COPPER ALLOY 544 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-750 FED SPEC ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH20
NUT THICKNESS0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
DRIVE POINT DEPTH0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
DRIVE POINT QUANTITY2
NUT DIAMETER0.625 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
49135Interchangeable
interchangeable cross-reference
interchangeable
FCM070069Interchangeable
interchangeable cross-reference
interchangeable
49135-UInterchangeable
interchangeable cross-reference
interchangeable
505-3793-002Interchangeable
interchangeable cross-reference
interchangeable
21581Interchangeable
interchangeable cross-reference
interchangeable
TG337Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21581-01?
21581-01 is a NUT,PLAIN,ROUND.
What parts can replace 21581-01?
There are 8 known substitutes for 21581-01: 49135, FCM070069, 49135-U and 5 more. Substitute compatibility should be verified for your specific system.
Is 21581-01 still available?
21581-01 is currently cancelled.
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