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Technical Data Sheet
PartsTable / COMPONENT / 4320-U
4320-U ✓ 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 DISK,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: PAN NO. 2, head_height: 0.156 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.312 INCHES NOMINAL IN, thread_length: 0.188 INCHES MINIMUM IN.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-995-7091, 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
4320-U
NSN: 5305-00-995-7091
FSC: 5305
CAGE: 00141 — ROLLER BEARING CO OF AMERICA, INC DIV PIC DESIGN (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_stylePAN NO. 2
head_height0.156 INCHES NOMINAL IN
thread_class2A A
head_diameter0.312 INCHES NOMINAL IN
thread_length0.188 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.688 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN
shoulder_length0.500 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.188 INCHES NOMINAL FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
NSN5305-00-995-7091
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4320-U · 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: 0.164 INCHES IN
•
HEAD DIAMETER: 0.312 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.156 INCHES NOMINAL IN
•
HEAD STYLE: PAN NO. 2
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 COMP 303S MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
FASTENER LENGTH: 0.688 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 32
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD DIAMETER0.312 INCHES NOMINAL IN
HEAD HEIGHT0.156 INCHES NOMINAL IN
HEAD STYLEPAN NO. 2
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 COMP 303S MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SHOULDER SHAPEROUND FIRST SHOULDER
FASTENER LENGTH0.688 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH32
SHOULDER DIAMETER0.188 INCHES NOMINAL FIRST SHOULDER IN
THREAD LENGTH0.188 INCHES MINIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
4070183Interchangeable
interchangeable cross-reference
interchangeable
2995PL0893337Interchangeable
interchangeable cross-reference
interchangeable
1305-022Interchangeable
interchangeable cross-reference
interchangeable
4320-UInterchangeable
interchangeable cross-reference
interchangeable
4320-U-180Interchangeable
interchangeable cross-reference
interchangeable
10-3243-4Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4320-U?
4320-U is a DISK,VALVE.
What parts can replace 4320-U?
There are 11 known substitutes for 4320-U: 4070183, 2995PL0893337, 1305-022 and 8 more. Substitute compatibility should be verified for your specific system.
Is 4320-U still available?
4320-U 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