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Technical Data Sheet
PartsTable / COMPONENT / 21042ADX
21042ADX ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: PAN, head_height: 0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN, thread_length: 0.158 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, screw_material: COPPER ALLOY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-212-3451, 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
21042ADX
NSN: 5305-01-212-3451
FSC: 5305
CAGE: 1VN02 — AIRDALE EXPRESS LLC DIV AIRDALE EXPRESS (USA)
SPECIFICATIONS
head_stylePAN
head_height0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
thread_length0.158 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.220 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-212-3451
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21042ADX · 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: 0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 32
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD CLASS: 2A A
•
THREAD LENGTH: 0.158 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
HEAD DIAMETER: 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH32
NOMINAL THREAD DIAMETER0.138 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD CLASS2A A
THREAD LENGTH0.158 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
HEAD DIAMETER0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALCOPPER ALLOY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
21042-3613Interchangeable
interchangeable cross-reference
interchangeable
21042Interchangeable
interchangeable cross-reference
interchangeable
3613Interchangeable
interchangeable cross-reference
interchangeable
A30512-9-65Interchangeable
interchangeable cross-reference
interchangeable
850260Interchangeable
interchangeable cross-reference
interchangeable
1015Z846Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21042ADX?
21042ADX is a SCREW,MACHINE.
What parts can replace 21042ADX?
There are 12 known substitutes for 21042ADX: 21042-3613, 21042, 3613 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21042ADX?
21042ADX is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-212-3451. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026