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55A4D31-1 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

55A4D31-1: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT CHAMFER, head_height: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.638 INCHES MINIMUM AND 0.643 INCHES MAXIMUM IN, thread_length: 0.562 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN, screw_material: STEEL COMP 8620. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-703-9503, 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
55A4D31-1
NSN: 5305-00-703-9503
FSC: 5305 — Screws
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
head_styleFLAT CHAMFER
head_height0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.638 INCHES MINIMUM AND 0.643 INCHES MAXIMUM IN
thread_length0.562 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
screw_materialSTEEL COMP 8620
fastener_length1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedCASEHARDENED
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.500 INCHES IN
screw_surface_treatmentCADMIUM AND CHROMATE
NSN5305-00-703-9503
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 55A4D31-1 · 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 HEIGHT: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
SCREW SURFACE TREATMENT: CADMIUM AND CHROMATE
•
FASTENER LENGTH: 1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.562 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
FEATURES PROVIDED: CASEHARDENED
•
HEAD STYLE: FLAT CHAMFER
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
SCREW SURFACE TREATMENTCADMIUM AND CHROMATE
FASTENER LENGTH1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN
THREAD LENGTH0.562 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
FEATURES PROVIDEDCASEHARDENED
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 8620
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 1
59A62B164Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 55A4D31-1?
55A4D31-1 is a SCREW,MACHINE.
What parts can replace 55A4D31-1?
There is 1 known substitute for 55A4D31-1: 59A62B164. Substitute compatibility should be verified for your specific system.
What is the NSN for 55A4D31-1?
55A4D31-1 is cataloged in the U.S. Government catalog under NSN 5305-00-703-9503. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.