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PartsTable / COMPONENT / 845-4558737 ITEM 31L1
845-4558737 ITEM 31L1 ✓ 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 thread_class: 3A A, thread_length: 2.375 INCHES NOMINAL IN, screw_material: NICKEL ALLOY, fastener_length: 2.600 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, nominal_thread_diameter: 0.625 INCHES 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 5305-01-172-5923, 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
845-4558737 ITEM 31L1
NSN: 5305-01-172-5923
FSC: 5305
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
thread_class3A A
thread_length2.375 INCHES NOMINAL IN
screw_materialNICKEL ALLOY
fastener_length2.600 INCHES NOMINAL IN
thread_directionRIGHT-HAND
nominal_thread_diameter0.625 INCHES IN
thread_quantity_per_inch11
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
criticality_code_justificationZZZX
departure_from_cited_designatorMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
NSN5305-01-172-5923
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 845-4558737 ITEM 31L1 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
CRITICALITY CODE JUSTIFICATION: ZZZX
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
SCREW MATERIAL: NICKEL ALLOY
•
THREAD QUANTITY PER INCH: 11
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
FASTENER LENGTH: 2.600 INCHES NOMINAL IN
•
THREAD LENGTH: 2.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
CRITICALITY CODE JUSTIFICATIONZZZX
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
SCREW MATERIALNICKEL ALLOY
THREAD QUANTITY PER INCH11
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
FASTENER LENGTH2.600 INCHES NOMINAL IN
THREAD LENGTH2.375 INCHES NOMINAL IN
THREAD CLASS3A A
NOMINAL THREAD DIAMETER0.625 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 34
501-4675682 ITEM 4Interchangeable
interchangeable cross-reference
interchangeable
501-4675682 ITEM 4L1Interchangeable
interchangeable cross-reference
interchangeable
1.500-06UNC-2A X 5.000L1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-286 GRADE 500Interchangeable
interchangeable cross-reference
interchangeable
1 3/4-5UNC-3A X 12 5/8 INCHESL1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222, TYPE IVL1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 845-4558737 ITEM 31L1?
845-4558737 ITEM 31L1 is a SCREW,MACHINE.
What parts can replace 845-4558737 ITEM 31L1?
There are 34 known substitutes for 845-4558737 ITEM 31L1: 501-4675682 ITEM 4, 501-4675682 ITEM 4L1, 1.500-06UNC-2A X 5.000L1 and 31 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 845-4558737 ITEM 31L1?
845-4558737 ITEM 31L1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-172-5923. 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