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13-21816 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

13-21816: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include end_item_identification: 3930015080886, part_name_assigned_by_controlling_agency: SCREW,HEX FLANGE HEAD. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-275-2013, 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
13-21816
NSN: 5310-00-275-2013
NIINs: 002752013, 008101786, 015082340
FSC: 5310 — Nuts and Washers
CAGE: 15879 — GENERAL EQUIPMENT CO (USA)
SPECIFICATIONS
end_item_identification3930015080886
part_name_assigned_by_controlling_agencySCREW,HEX FLANGE HEAD
NSN5310-00-275-2013
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 13-21816 · 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: 0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
NUT HEIGHT: 0.250 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
THREAD SERIESUNF
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.375 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.250 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
NUT STYLEHEXAGON
THREAD CLASS3B
SUBSTITUTES & CROSS-REFERENCES 5
B8005-08-005FN214Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
4158000-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MS20364-624CReference document
Same NSN cross-reference
Reference document — Identification reference
404 838Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
0805214Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 13-21816?
13-21816 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 13-21816?
There are 5 known substitutes for 13-21816: B8005-08-005FN214, 4158000-1, MS20364-624C and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 13-21816?
13-21816 is cataloged in the U.S. Government catalog under NSN 5310-00-275-2013. 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.