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PartsTable / COMPONENT / MS51957-43
MS51957-43 ✓ 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: 0.105 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.306 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, thread_length: 0.344 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, screw_material: STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 316L OR ALUMINUM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-054-6668, 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
MS51957-43
NSN: 5305-00-054-6668
FSC: 5305
CAGE: K1562 — LOCKHEED MARTIN UK AMPTHILL LIMITED (GBR)
SPECIFICATIONS
head_stylePAN
head_height0.105 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.306 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
thread_length0.344 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
screw_materialSTEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 316L OR ALUMINUM
fastener_length0.344 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
special_featuresITEM IS MODIFIED FROM MS51957
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.164 INCHES IN
screw_surface_treatmentALUMINUM
NSN5305-00-054-6668
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51957-43 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
418293-9Interchangeable
interchangeable cross-reference
interchangeable
MS36216-9Interchangeable
interchangeable cross-reference
interchangeable
AN515C2-12Interchangeable
interchangeable cross-reference
interchangeable
R5111MNInterchangeable
interchangeable cross-reference
interchangeable
XR5111NInterchangeable
interchangeable cross-reference
interchangeable
MS25036-113Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51957-43?
MS51957-43 is a SCREW,MACHINE.
What parts can replace MS51957-43?
There are 29 known substitutes for MS51957-43: 418293-9, MS36216-9, AN515C2-12 and 26 more. Substitute compatibility should be verified for your specific system.
Is MS51957-43 still available?
MS51957-43 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