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Technical Data Sheet
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F3721 — NUT,PLAIN,SLOTTED,HEXAGON

✓ Government record, cited
Hasbro · NUT WASHER
PRODUCT OVERVIEW

F3721: NUT,PLAIN,SLOTTED,HEXAGON.

Web-out with the exciting Spidey and His Amazing Friends Spider Crawl-R HQ playset! This 2-in-1 Super Hero playset with lights and sounds converts from a large-scale rolling vehicle into a 2-foot-tall HQ tower! When the playset is in tower mode, kids can imagine planning missions at the command center, stage a pretend show using the included instrument accessories, swing on the web arm, and more!

Pull out the ramp, and the Spidey action figure can speed down on the included motorcycle! In both vehicle mode and playset mode, preschoolers can eject the web bumper to knock troublemakers out of the way! With lights, sounds, and phrases inspired by the preschool Marvel show, kids ages 3 and up will love imagining sensational adventures with this 2-in-1 Team Spidey headquarters playset.

Copyright MARVEL. All trademarks and registered trademarks are the property of their respective owners. Hasbro and all related terms are trademarks of Hasbro.

TEAM SPIDEY HEADQUARTERS PLAYSET: This excitin This part is cataloged in the U.S. Government catalog under NSN 5310-00-176-8109, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
F3721
NSN: 5310-00-176-8109
NIINs: 001768109, 014673694
FSC: 5310 — Nuts and Washers
CAGE: 0CSK6 — WINCO, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSLOTTED, HEXAGON
nut_height0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
bearing_surface_finish125.0 MICROINCHES
thread_quantity_per_inch24
NSN5310-00-176-8109
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: F3721 · Hasbro ⚠ 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: 0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
•
BEARING SURFACE FINISH: 125.0 MICROINCHES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
NUT HEIGHT: 0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
BEARING SURFACE FINISH125.0 MICROINCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
NUT HEIGHT0.172 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
NUT STYLESLOTTED, HEXAGON
THREAD CLASS3B
SUBSTITUTES & CROSS-REFERENCES 8
2210304Reference document
Same NSN cross-reference
Reference document — Secondary reference
437-7Reference document
Same NSN cross-reference
Reference document — Secondary reference
175S6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
21533Reference document
Same NSN cross-reference
Reference document — Secondary reference
F52SC320-524Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AN320-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is F3721?
F3721 is a NUT,PLAIN,SLOTTED,HEXAGON manufactured by Hasbro.
What parts can replace F3721?
There are 8 known substitutes for F3721: 2210304, 437-7, 175S6 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for F3721?
F3721 is cataloged in the U.S. Government catalog under NSN 5310-00-176-8109. 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.