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Technical Data Sheet
PartsTable / COMPONENT / 4121ADX
4121ADX ✓ 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: FILLISTER, thread_class: 2A A, head_diameter: 0.235 INCHES NOMINAL IN, thread_length: 0.187 INCHES NOMINAL IN, screw_material: COPPER ALLOY, fastener_length: 0.187 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-054-2012, 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
4121ADX
NSN: 5305-01-054-2012
FSC: 5305
CAGE: 1VN02 — AIRDALE EXPRESS LLC DIV AIRDALE EXPRESS (USA)
SPECIFICATIONS
head_styleFILLISTER
thread_class2A A
head_diameter0.235 INCHES NOMINAL IN
thread_length0.187 INCHES NOMINAL IN
screw_materialCOPPER ALLOY
fastener_length0.187 INCHES NOMINAL IN
thread_directionRIGHT-HAND
nominal_thread_diameter0.112 INCHES IN
screw_surface_treatmentNICKEL
thread_quantity_per_inch40
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-054-2012
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4121ADX · 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
•
SCREW SURFACE TREATMENT: NICKEL
•
SCREW MATERIAL: COPPER ALLOY
•
THREAD LENGTH: 0.187 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 40
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
FASTENER LENGTH: 0.187 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
SCREW SURFACE TREATMENTNICKEL
SCREW MATERIALCOPPER ALLOY
THREAD LENGTH0.187 INCHES NOMINAL IN
THREAD QUANTITY PER INCH40
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
FASTENER LENGTH0.187 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLEFILLISTER
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
6139025-95Interchangeable
interchangeable cross-reference
interchangeable
412AInterchangeable
interchangeable cross-reference
interchangeable
412Interchangeable
interchangeable cross-reference
interchangeable
E4121-001Interchangeable
interchangeable cross-reference
interchangeable
E4125-001Interchangeable
interchangeable cross-reference
interchangeable
4121Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4121ADX?
4121ADX is a SCREW,MACHINE.
What parts can replace 4121ADX?
There are 16 known substitutes for 4121ADX: 6139025-95, 412A, 412 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4121ADX?
4121ADX is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-054-2012. 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