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Technical Data Sheet
PartsTable / COMPONENT / MS51955-77
MS51955-77 ✓ 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 SETSCREW is a the manufacturer industrial component. Key specifications include head_style: SQUARE, head_height: 0.361 INCHES MINIMUM AND 0.369 INCHES MAXIMUM IN, point_style: CUP, thread_class: 2A A, thread_length: 2.286 INCHES MINIMUM IN, fastener_length: 2.440 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-054-9291, 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
MS51955-77
NSN: 5305-00-054-9291
FSC: 5305
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
head_styleSQUARE
head_height0.361 INCHES MINIMUM AND 0.369 INCHES MAXIMUM IN
point_styleCUP
thread_class2A A
thread_length2.286 INCHES MINIMUM IN
fastener_length2.440 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_between_flats0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
internal_drive_styleW/O INTERNAL DRIVE
nominal_thread_diameter0.500 INCHES IN
NSN5305-00-054-9291
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51955-77 · 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 LENGTH: 2.500 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.361 INCHES MINIMUM AND 0.389 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.406 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: W/O INTERNAL DRIVE
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH2.500 INCHES MAXIMUM IN
HEAD HEIGHT0.361 INCHES MINIMUM AND 0.389 INCHES MAXIMUM IN
FASTENER LENGTH2.406 INCHES MINIMUM AND 2.500 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
INTERNAL DRIVE STYLEW/O INTERNAL DRIVE
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD CLASS2A A
MATERIALSTEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1022 OR STEEL COMP 1212 OR STEEL COMP 1213 OR STEEL COMP 1137 OR STEEL COMP 1035 OR STEEL COMP 1536 OR STEEL COMP 1037 OR STEEL COMP 1038 OR STEEL COMP 1039 OR STEEL COMP 1040 OR STEEL COMP 1541 OR STEEL COMP 1042 OR STEEL COMP 1043 OR STEEL COMP 1045 OR STEEL COMP 1139 OR STEEL COMP 1140 OR STEEL COMP 1141 OR STEEL COMP 1144 OR STEEL COMP 1145 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
FF-S-210Interchangeable
interchangeable cross-reference
interchangeable
FF-S-103 TYPE 2 STYLE 5Interchangeable
interchangeable cross-reference
interchangeable
179120Interchangeable
interchangeable cross-reference
interchangeable
MS51955-18Interchangeable
interchangeable cross-reference
interchangeable
FF-S-210BInterchangeable
interchangeable cross-reference
interchangeable
5305000580784Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51955-77?
MS51955-77 is a SETSCREW.
What parts can replace MS51955-77?
There are 12 known substitutes for MS51955-77: FF-S-210, FF-S-103 TYPE 2 STYLE 5, 179120 and 9 more. Substitute compatibility should be verified for your specific system.
Is MS51955-77 still available?
MS51955-77 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