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21C528 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21C528: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_type: DRILLED, head_style: HEXAGON, head_height: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN, thread_class: 2A A, hole_diameter: 0.094 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-024-2447, 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
21C528
NSN: 5305-01-024-2447
FSC: 5305 — Screws
CAGE: 77237 — DANA OFF HIGHWAY PRODUCTS, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_typeDRILLED
head_styleHEXAGON
head_height0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
thread_class2A A
hole_diameter0.094 INCHES NOMINAL IN
hole_quantity1
thread_length0.875 INCHES NOMINAL IN
fastener_length1.710 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
width_between_flats0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
NSN5305-01-024-2447
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21C528 · 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: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.710 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.875 INCHES NOMINAL IN
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
•
HOLE CONFIGURATION STYLE: HEXAGON LONGITUDINAL HOLE
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
FASTENER LENGTH1.710 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
THREAD LENGTH0.875 INCHES NOMINAL IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
HOLE CONFIGURATION STYLEHEXAGON LONGITUDINAL HOLE
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH120000 POUNDS PER SQUARE INCH LBS
SUBSTITUTES & CROSS-REFERENCES 1
3C528Reference 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 21C528?
21C528 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 21C528?
There is 1 known substitute for 21C528: 3C528. Substitute compatibility should be verified for your specific system.
What is the NSN for 21C528?
21C528 is cataloged in the U.S. Government catalog under NSN 5305-01-024-2447. This indicates validated use in U.S. government and defense supply chains.
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