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PartsTable / COMPONENT / MS51959-87
MS51959-87 ✓ 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: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 1.900 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN, screw_material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316, fastener_length: 2.000 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-719-4995, 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
MS51959-87
NSN: 5305-00-719-4995
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length1.900 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
screw_materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316
fastener_length2.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.250 INCHES IN
screw_surface_treatmentPASSIVATE
minimum_tensile_strength80000 POUNDS PER SQUARE INCH LBS
NSN5305-00-719-4995
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51959-87 · 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: 0.250 INCHES IN
•
THREAD LENGTH: 1.900 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD CLASS: 2A A
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
•
HEAD DIAMETER: 0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD LENGTH1.900 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
THREAD CLASS2A A
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
HEAD DIAMETER0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
FASTENER LENGTH2.000 INCHES NOMINAL IN
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
T22315Interchangeable
interchangeable cross-reference
interchangeable
22315Interchangeable
interchangeable cross-reference
interchangeable
ST28079Interchangeable
interchangeable cross-reference
interchangeable
PEI 8807Interchangeable
interchangeable cross-reference
interchangeable
MC14512CLInterchangeable
interchangeable cross-reference
interchangeable
MC14512ALInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51959-87?
MS51959-87 is a SCREW,MACHINE.
What parts can replace MS51959-87?
There are 10 known substitutes for MS51959-87: T22315, 22315, ST28079 and 7 more. Substitute compatibility should be verified for your specific system.
Is MS51959-87 still available?
MS51959-87 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