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021-16764 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

021-16764: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.658 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 2.500 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN, fastener_length: 4.000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-959-7016, 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
021-16764
NSN: 5305-00-959-7016
FSC: 5305 — Screws
CAGE: 66935 — JOHNSON CONTROLS NAVY SYSTEMS, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.658 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN
thread_class2A A
thread_length2.500 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN
fastener_length4.000 INCHES NOMINAL IN
hardness_rating19.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_between_flats1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
nominal_thread_diameter1.125 INCHES IN
minimum_tensile_strength105000 POUNDS PER SQUARE INCH LBS
NSN5305-00-959-7016
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 021-16764 · 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
•
HEAD HEIGHT: 0.658 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN
•
FASTENER LENGTH: 4.000 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 2.500 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN
•
HARDNESS RATING: 19.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 1.125 INCHES IN
•
HEAD STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.658 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN
FASTENER LENGTH4.000 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH2.500 INCHES MINIMUM AND 3.000 INCHES MAXIMUM IN
HARDNESS RATING19.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER1.125 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 5
PL-315394 PC 52Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
3258421-5Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS90725-258Reference document
Same NSN cross-reference
Reference document — Secondary reference
476-80724-000B PART NO. 40Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
315394 PC 52Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 021-16764?
021-16764 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 021-16764?
There are 5 known substitutes for 021-16764: PL-315394 PC 52, 3258421-5, MS90725-258 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 021-16764?
021-16764 is cataloged in the U.S. Government catalog under NSN 5305-00-959-7016. 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.