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Technical Data Sheet
PartsTable / COMPONENT / MS51975-29
MS51975-29 ✓ 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,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4037 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 8630 OR STEEL COMP 8740 OVERALL, head_style: FLAT CHAMFER, head_height: 0.302 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.729 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, thread_length: 0.595 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-939-0660, 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
MS51975-29
NSN: 5305-00-939-0660
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL COMP 4037 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 8630 OR STEEL COMP 8740 OVERALL
head_styleFLAT CHAMFER
head_height0.302 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.729 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
thread_length0.595 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.600 INCHES MINIMUM AND 1.620 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.496 INCHES MINIMUM AND 0.498 INCHES MAXIMUM FIRST SHOULDER IN
NSN5305-00-939-0660
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51975-29 · 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
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MINIMUM TENSILE STRENGTH: 140000 POUNDS PER SQUARE INCH LBS
•
INTERNAL DRIVE STYLE: HEXAGON
•
SHOULDER DIAMETER: 0.496 INCHES MINIMUM AND 0.498 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD QUANTITY PER INCH: 16
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER SHAPEROUND FIRST SHOULDER
MINIMUM TENSILE STRENGTH140000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLEHEXAGON
SHOULDER DIAMETER0.496 INCHES MINIMUM AND 0.498 INCHES MAXIMUM FIRST SHOULDER IN
THREAD QUANTITY PER INCH16
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
HEAD STYLEFLAT CHAMFER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
E90Interchangeable
interchangeable cross-reference
interchangeable
E17A4Interchangeable
interchangeable cross-reference
interchangeable
10077REVAPC52Interchangeable
interchangeable cross-reference
interchangeable
96727PC6Interchangeable
interchangeable cross-reference
interchangeable
20087PCPACKINGInterchangeable
interchangeable cross-reference
interchangeable
20087Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51975-29?
MS51975-29 is a SCREW,SHOULDER.
What parts can replace MS51975-29?
There are 9 known substitutes for MS51975-29: E90, E17A4, 10077REVAPC52 and 6 more. Substitute compatibility should be verified for your specific system.
Is MS51975-29 still available?
MS51975-29 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