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PartsTable / COMPONENT / 311621
311621 ✓ 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: PAN NO. 2, head_height: 0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN, thread_length: 0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, screw_material: STEEL COMP 1038.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-121-8226, 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
311621
NSN: 5305-00-121-8226
FSC: 5305
CAGE: 80256 — OUTBOARD MARINE CORP (USA)
SPECIFICATIONS
head_stylePAN NO. 2
head_height0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
thread_length0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
screw_materialSTEEL COMP 1038
fastener_length0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
hardness_rating24.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
internal_drive_styleSLOT
nominal_thread_diameter0.250 INCHES IN
screw_surface_treatmentCADMIUM
NSN5305-00-121-8226
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 311621 · 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 CLASS: 2A A
•
HEAD HEIGHT: 0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 20
•
FASTENER LENGTH: 0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: SLOT
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD CLASS2A A
HEAD HEIGHT0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH20
FASTENER LENGTH0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD LENGTH0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
SCREW MATERIALSTEEL COMP 1038
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
A907X005Interchangeable
interchangeable cross-reference
interchangeable
311621Interchangeable
interchangeable cross-reference
interchangeable
3960A907X5Interchangeable
interchangeable cross-reference
interchangeable
30933-0Interchangeable
interchangeable cross-reference
interchangeable
933Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 311621?
311621 is a SCREW,MACHINE.
What parts can replace 311621?
There are 5 known substitutes for 311621: A907X005, 311621, 3960A907X5 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 311621?
311621 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-121-8226. 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