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Technical Data Sheet
PartsTable / COMPONENT / 977999
977999 ✓ 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 CHAMFER, head_height: 0.047 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.218 INCHES NOMINAL IN, thread_length: 0.094 INCHES MINIMUM IN, screw_material: STEEL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-531-0060, 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
977999
NSN: 5305-00-531-0060
FSC: 5305
CAGE: 70408 — AT AND T CORP (USA)
SPECIFICATIONS
head_styleFLAT CHAMFER
head_height0.047 INCHES NOMINAL IN
thread_class3A A
head_diameter0.218 INCHES NOMINAL IN
thread_length0.094 INCHES MINIMUM IN
screw_materialSTEEL
fastener_length0.141 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedCASEHARDENED
internal_drive_styleSLOT
nominal_thread_diameter0.138 INCHES IN
screw_surface_treatmentNICKEL
NSN5305-00-531-0060
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 977999 · 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: 0.138 INCHES IN
•
SCREW SURFACE TREATMENT: NICKEL
•
THREAD QUANTITY PER INCH: 40
•
THREAD SERIES DESIGNATOR: UNF
•
FEATURES PROVIDED: CASEHARDENED
•
THREAD DIRECTION: RIGHT-HAND
•
FASTENER LENGTH: 0.141 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.218 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.138 INCHES IN
SCREW SURFACE TREATMENTNICKEL
THREAD QUANTITY PER INCH40
THREAD SERIES DESIGNATORUNF
FEATURES PROVIDEDCASEHARDENED
THREAD DIRECTIONRIGHT-HAND
FASTENER LENGTH0.141 INCHES NOMINAL IN
HEAD DIAMETER0.218 INCHES NOMINAL IN
HEAD STYLEFLAT CHAMFER
HEAD HEIGHT0.047 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
SJ3542PC63Interchangeable
interchangeable cross-reference
interchangeable
SL4434PC50Interchangeable
interchangeable cross-reference
interchangeable
SL4967PC63Interchangeable
interchangeable cross-reference
interchangeable
5330010796372Interchangeable
interchangeable cross-reference
interchangeable
97799Interchangeable
interchangeable cross-reference
interchangeable
10394131Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 977999?
977999 is a SCREW,MACHINE.
What parts can replace 977999?
There are 8 known substitutes for 977999: SJ3542PC63, SL4434PC50, SL4967PC63 and 5 more. Substitute compatibility should be verified for your specific system.
Is 977999 still available?
977999 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026