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Technical Data Sheet
PartsTable / COMPONENT / LS557-12
LS557-12 ✓ 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: BUTTON, head_height: 0.118 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.425 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, thread_length: 1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN, screw_material: STEEL COMP 1010. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-167-3931, 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
LS557-12
NSN: 5305-00-167-3931
FSC: 5305
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
head_styleBUTTON
head_height0.118 INCHES NOMINAL IN
thread_class2A A
head_diameter0.425 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
thread_length1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
screw_materialSTEEL COMP 1010
fastener_length1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.190 INCHES IN
screw_surface_treatmentCADMIUM
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
NSN5305-00-167-3931
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: LS557-12 · 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
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
MINIMUM TENSILE STRENGTH: 55000 POUNDS PER SQUARE INCH LBS
•
SCREW SURFACE TREATMENT: CADMIUM
•
HEAD STYLE: BUTTON
•
HEAD HEIGHT: 0.118 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES DESIGNATOR: UNF
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.190 INCHES IN
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
SCREW SURFACE TREATMENTCADMIUM
HEAD STYLEBUTTON
HEAD HEIGHT0.118 INCHES NOMINAL IN
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNF
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
FASTENER LENGTH1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-671 FED SPEC SINGLE MATERIAL RESPONSE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
10420877Interchangeable
interchangeable cross-reference
interchangeable
507168-68Interchangeable
interchangeable cross-reference
interchangeable
MS35207-268Interchangeable
interchangeable cross-reference
interchangeable
AN526-1032R20Interchangeable
Same NIIN cross-reference
interchangeable
FFS92ANDTYPE3ANDSTYLE7CInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is LS557-12?
LS557-12 is a SCREW,MACHINE.
What parts can replace LS557-12?
There are 5 known substitutes for LS557-12: 10420877, 507168-68, MS35207-268 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for LS557-12?
LS557-12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-167-3931. 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