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821402 — NUT,PLAIN,HEXAGON

✓ Government record, cited
GBC · BOLT SCREW
PRODUCT OVERVIEW

821402: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a GBC industrial component. Key specifications include thread_series: UNIFIED NATIONAL COARSE (UNC), special_features: HEX; RADIO PATTERN BRASS, thread_direction: RIGHT-HAND, end_item_identification: CHLORINE MONITOR, part_name_assigned_by_controlling_agency: FLWMTR WIN 2.75X9.5(INAVY)FLOW METER WINDOW(DRAWING). This part is cataloged in the U.S.

Government catalog under NSN 5306-00-208-8403, 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
821402
NSN: 5306-00-208-8403
NIINs: 002088403, 015086724, 015680059
FSC: 5306 — Bolts
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
thread_seriesUNIFIED NATIONAL COARSE (UNC)
special_featuresHEX; RADIO PATTERN BRASS
thread_directionRIGHT-HAND
end_item_identificationCHLORINE MONITOR
part_name_assigned_by_controlling_agencyFLWMTR WIN 2.75X9.5(INAVY)FLOW METER WINDOW(DRAWING)
NSN5306-00-208-8403
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 821402 · GBC ⚠ 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
•
HEAD HEIGHT: 0.302 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.125 INCHES NOMINAL IN
•
THREAD LENGTH: 0.625 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-857 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
FEATURES PROVIDED: FINISHED HEAD
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.302 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
FASTENER LENGTH1.125 INCHES NOMINAL IN
THREAD LENGTH0.625 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-857 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.500 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.725 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
FF-S-85Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 821402?
821402 is a NUT,PLAIN,HEXAGON manufactured by GBC.
What parts can replace 821402?
There is 1 known substitute for 821402: FF-S-85. Substitute compatibility should be verified for your specific system.
What is the NSN for 821402?
821402 is cataloged in the U.S. Government catalog under NSN 5306-00-208-8403. 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.