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PartsTable / COMPONENT / 20258439
20258439 ✓ 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: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 1.125 INCHES NOMINAL IN, thread_length: 0.880 INCHES MINIMUM IN, screw_material: STEEL, fastener_length: 2.880 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 5305-00-833-5290, 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
20258439
NSN: 5305-00-833-5290
FSC: 5305
CAGE: 98752 — WARNER ROBINS AIR LOGISTICS CENTER (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter1.125 INCHES NOMINAL IN
thread_length0.880 INCHES MINIMUM IN
screw_materialSTEEL
fastener_length2.880 INCHES NOMINAL IN
special_featuresACTION ID 45398710
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.562 INCHES IN
screw_surface_treatmentCADMIUM
NSN5305-00-833-5290
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 20258439 · 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 STYLE: FLAT COUNTERSUNK
•
HEAD DIAMETER: 1.125 INCHES NOMINAL IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD DIAMETER: 0.562 INCHES IN
•
SCREW SURFACE TREATMENT: CADMIUM
•
THREAD QUANTITY PER INCH: 18
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEFLAT COUNTERSUNK
HEAD DIAMETER1.125 INCHES NOMINAL IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD DIAMETER0.562 INCHES IN
SCREW SURFACE TREATMENTCADMIUM
THREAD QUANTITY PER INCH18
THREAD SERIES DESIGNATORUNF
SPECIAL FEATURESACTION ID 45398710
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
170521ITEM1CInterchangeable
interchangeable cross-reference
interchangeable
17345-650Interchangeable
interchangeable cross-reference
interchangeable
10254-8Interchangeable
interchangeable cross-reference
interchangeable
10106066-25Interchangeable
interchangeable cross-reference
interchangeable
1A1501MInterchangeable
interchangeable cross-reference
interchangeable
40-030024-27Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20258439?
20258439 is a SCREW,MACHINE.
What parts can replace 20258439?
There are 8 known substitutes for 20258439: 170521ITEM1C, 17345-650, 10254-8 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20258439?
20258439 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-833-5290. 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