PartsTable
Technical Data Sheet
PartsTable / MRO / 5-1-25
5-1-25 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 CYLINDER HEAD,DIESEL ENGINE is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, body_style: SLOTTED LIMITER, head_style: FLAT COUNTERSUNK, seal_width: 0.260 INCHES NOMINAL IN, reach_length: 0.375 INCHES NOMINAL IN, thread_class: 2A A. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-144-3950, 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
MRO→ MRO_GENERAL→ 5-1-25
NSN: 5305-00-144-3950
FSC: 5305
CAGE: 19203 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV US ARMY RESEARCH, DEVELOPMENT AND ENGINEERING COMMAND ARMAMENT (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
body_styleSLOTTED LIMITER
head_styleFLAT COUNTERSUNK
seal_width0.260 INCHES NOMINAL IN
reach_length0.375 INCHES NOMINAL IN
thread_class2A A
usage_designENGINE OTHER THAN AIRCRAFT
head_diameter0.249 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN
physical_formLIQUID
thread_length0.313 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
overall_length120.0 INCHES IN
screw_materialSTEEL OR STEEL COMP 1010
NSN5305-00-144-3950
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5-1-25 · 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
•
HEAD DIAMETER: 0.249 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
SCREW MATERIAL: STEEL OR STEEL COMP 1010
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
DEPARTURE FROM CITED DESIGNATOR: AS MODIFIED BY INTERNAL DRIVE STYLE AND LOCATION
•
FASTENER LENGTH: 0.375 INCHES NOMINAL IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-630 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-631 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER0.249 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
SCREW MATERIALSTEEL OR STEEL COMP 1010
NOMINAL THREAD DIAMETER0.138 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
DEPARTURE FROM CITED DESIGNATORAS MODIFIED BY INTERNAL DRIVE STYLE AND LOCATION
FASTENER LENGTH0.375 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-630 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-631 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE
THREAD DIRECTIONRIGHT-HAND
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
14U1487PCADD5125Interchangeable
interchangeable cross-reference
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5125Interchangeable
interchangeable cross-reference
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3274Interchangeable
interchangeable cross-reference
interchangeable
M7421Interchangeable
interchangeable cross-reference
interchangeable
G5450PC41Interchangeable
interchangeable cross-reference
interchangeable
5974Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5-1-25?
5-1-25 is a CYLINDER HEAD,DIESEL ENGINE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 5-1-25?
There are 27 known substitutes for 5-1-25: 14U1487PCADD5125, 5125, 3274 and 24 more. Substitute compatibility should be verified for your specific system.
Is 5-1-25 still available?
5-1-25 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