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21518818 — STUD,PLAIN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21518818: STUD,PLAIN.

The STUD,PLAIN is a the manufacturer industrial component. Key specifications include material: STEEL, thread_class: 2A NUT THREAD A, thread_length: 0.375 INCHES NOMINAL STUD THREAD IN, overall_length: 2.438 INCHES NOMINAL IN, thread_direction: RIGHT-HAND NUT THREAD, nominal_thread_size: 0.625 INCHES STUD THREAD IN. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-228-0681, 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
21518818
NSN: 5307-01-228-0681
FSC: 5307 — Studs
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialSTEEL
thread_class2A NUT THREAD A
thread_length0.375 INCHES NOMINAL STUD THREAD IN
overall_length2.438 INCHES NOMINAL IN
special_featuresSTUD END HAS NPTF PIPE THREAD; 0.312 IN. DIA HOLE,1.500 IN. DEEP; 0.312 IN. DIA INTERSECTING HOLE LOCATED 1.156 IN. FROM STUD END IN
thread_directionRIGHT-HAND NUT THREAD
nominal_thread_size0.625 INCHES STUD THREAD IN
thread_quantity_per_inch11 NUT THREAD
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) NUT THREAD
NSN5307-01-228-0681
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21518818 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD LENGTH: 0.375 INCHES NOMINAL STUD THREAD IN
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
•
NOMINAL THREAD SIZE: 0.625 INCHES NUT THREAD IN
TECHNICAL CHARACTERISTICS
THREAD LENGTH0.375 INCHES NOMINAL STUD THREAD IN
THREAD LENGTH0.625 INCHES NOMINAL NUT THREAD IN
OVERALL LENGTH2.438 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
THREAD DIRECTIONRIGHT-HAND NUT THREAD
NOMINAL THREAD SIZE0.625 INCHES NUT THREAD IN
NOMINAL THREAD SIZE0.625 INCHES STUD THREAD IN
SPECIAL FEATURESSTUD END HAS NPTF PIPE THREAD; 0.312 IN. DIA HOLE,1.500 IN. DEEP; 0.312 IN. DIA INTERSECTING HOLE LOCATED 1.156 IN. FROM STUD END IN
THREAD CLASS2A NUT THREAD A
THREAD QUANTITY PER INCH11 NUT THREAD
OTHER ITEMS IN FSC 5307 — Studs
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5307-00-000-6436 5307-00-001-1578 5307-00-001-1761 5307-00-001-2366 5307-00-001-4491 5307-00-001-4624 5307-00-001-4625
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21518818?
21518818 is a STUD,PLAIN.
What is the NSN for 21518818?
21518818 is cataloged in the U.S. Government catalog under NSN 5307-01-228-0681. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.