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21720N PIECE 2 — SETSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21720N PIECE 2: SETSCREW.

The SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 416 OVERALL, head_style: HEADLESS (SETSCREW), point_style: BALL, point_length: 0.500 INCHES NOMINAL IN, thread_class: 3A A, point_diameter: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-174-8221, 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
21720N PIECE 2
NSN: 5305-01-174-8221
FSC: 5305 — Screws
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 416 OVERALL
head_styleHEADLESS (SETSCREW)
point_styleBALL
point_length0.500 INCHES NOMINAL IN
thread_class3A A
point_diameter0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
fastener_length3.438 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats0.438 INCHES NOMINAL IN
internal_drive_styleSQUARE
nominal_thread_diameter0.750 INCHES IN
thread_quantity_per_inch10
NSN5305-01-174-8221
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21720N PIECE 2 · 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
•
POINT DIAMETER: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
POINT LENGTH: 0.500 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.438 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
•
HEAD STYLE: HEADLESS (SETSCREW)
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
POINT DIAMETER0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
POINT LENGTH0.500 INCHES NOMINAL IN
FASTENER LENGTH3.438 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.750 INCHES IN
HEAD STYLEHEADLESS (SETSCREW)
THREAD DIRECTIONRIGHT-HAND
POINT STYLEBALL
INTERNAL DRIVE STYLESQUARE
SUBSTITUTES & CROSS-REFERENCES 1
12914N PIECE 2Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 21720N PIECE 2?
21720N PIECE 2 is a SETSCREW.
What parts can replace 21720N PIECE 2?
There is 1 known substitute for 21720N PIECE 2: 12914N PIECE 2. Substitute compatibility should be verified for your specific system.
What is the NSN for 21720N PIECE 2?
21720N PIECE 2 is cataloged in the U.S. Government catalog under NSN 5305-01-174-8221. 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.