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Technical Data Sheet
PartsTable / COMPONENT / MS51957-66
MS51957-66 ✓ 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: 0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN, thread_length: 0.792 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN, screw_material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-050-9232, 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
MS51957-66
NSN: 5305-00-050-9232
FSC: 5305
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
head_stylePAN
head_height0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
thread_length0.792 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
screw_materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316
fastener_length0.875 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.190 INCHES IN
screw_surface_treatmentPASSIVATE
minimum_tensile_strength80000 POUNDS PER SQUARE INCH LBS
NSN5305-00-050-9232
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51957-66 · 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 MATERIAL: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316
•
HEAD DIAMETER: 0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
•
HEAD STYLE: PAN
•
SCREW SURFACE TREATMENT: PASSIVATE
•
THREAD LENGTH: 0.792 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
MINIMUM TENSILE STRENGTH: 80000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS (FLIS)
SCREW MATERIALSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316
HEAD DIAMETER0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
HEAD STYLEPAN
SCREW SURFACE TREATMENTPASSIVATE
THREAD LENGTH0.792 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH LBS
NOMINAL THREAD DIAMETER0.190 INCHES IN
THREAD QUANTITY PER INCH24
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
AN520C10R14Interchangeable
interchangeable cross-reference
interchangeable
MS35234-66Interchangeable
interchangeable cross-reference
interchangeable
724-990056-157Interchangeable
interchangeable cross-reference
interchangeable
218013225Interchangeable
Same NIIN cross-reference
interchangeable
MS51957-66S316Interchangeable
Same NIIN cross-reference
interchangeable
33-03Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51957-66?
MS51957-66 is a SCREW,MACHINE.
What parts can replace MS51957-66?
There are 11 known substitutes for MS51957-66: AN520C10R14, MS35234-66, 724-990056-157 and 8 more. Substitute compatibility should be verified for your specific system.
Is MS51957-66 still available?
MS51957-66 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026