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Technical Data Sheet
PartsTable / COMPONENT / MS51959-13 REV B
MS51959-13 REV B ✓ 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: 0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN, thread_length: 0.168 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN, fastener_length: 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-223-8862, 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
MS51959-13 REV B
NSN: 5305-01-223-8862
FSC: 5305
CAGE: 96214 — RAYTHEON COMPANY DBA RAYTHEON (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
thread_length0.168 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
screw_materialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 310 OR STEEL COMP 316
fastener_length0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleCROSS RECESS TYPE 1
supplementary_featuresMFR TECHNICAL WARNING FOR TORNADOWEAPONS SYSTEM APPL,NSN 5305-00-770-2533 P/N MS51959-13 SCREW PARTLY TO SHORT AND BECOMES UNFASTENED
nominal_thread_diameter0.112 INCHES IN
screw_surface_treatmentPASSIVATE
NSN5305-01-223-8862
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51959-13 REV B · 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 DOCUMENT AND CLASSIFICATION: QQ-S-637 FED SPEC ALL MATERIAL RESPONSES OR 66 FED STD ALL MATERIAL RESPONSES
•
HEAD DIAMETER: 0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
SCREW SURFACE TREATMENT: PASSIVATE
•
THREAD QUANTITY PER INCH: 40
•
SUPPLEMENTARY FEATURES: MFR TECHNICAL WARNING FOR TORNADOWEAPONS SYSTEM APPL,NSN 5305-00-770-2533 P/N MS51959-13 SCREW PARTLY TO SHORT AND BECOMES UNFASTENED
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MINIMUM TENSILE STRENGTH: 80000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS (FLIS)
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-637 FED SPEC ALL MATERIAL RESPONSES OR 66 FED STD ALL MATERIAL RESPONSES
HEAD DIAMETER0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
SCREW SURFACE TREATMENTPASSIVATE
THREAD QUANTITY PER INCH40
SUPPLEMENTARY FEATURESMFR TECHNICAL WARNING FOR TORNADOWEAPONS SYSTEM APPL,NSN 5305-00-770-2533 P/N MS51959-13 SCREW PARTLY TO SHORT AND BECOMES UNFASTENED
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH LBS
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
245122Interchangeable
interchangeable cross-reference
interchangeable
FF-S-92 TY-1 ST Y-2SInterchangeable
interchangeable cross-reference
interchangeable
MS35200-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51959-13 REV B?
MS51959-13 REV B is a SCREW,MACHINE.
What parts can replace MS51959-13 REV B?
There are 3 known substitutes for MS51959-13 REV B: 245122, FF-S-92 TY-1 ST Y-2S, MS35200-12. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51959-13 REV B?
MS51959-13 REV B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-223-8862. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026