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508906 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

508906: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.442 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 0.716 INCHES MINIMUM AND 0.847 INCHES MAXIMUM IN, screw_material: PLASTIC POLYHEXAMETHYLENE ADIPAMIDE, fastener_length: 0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-250-5233, 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
508906
NSN: 5305-01-250-5233
FSC: 5305 — Screws
CAGE: 01014 — AVTRON AEROSPACE INC (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.442 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.716 INCHES MINIMUM AND 0.847 INCHES MAXIMUM IN
screw_materialPLASTIC POLYHEXAMETHYLENE ADIPAMIDE
fastener_length0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
special_featuresNATURAL COLOR
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleSLOT
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
NSN5305-01-250-5233
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 508906 · 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
•
FASTENER LENGTH: 0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: MIL-M-20693 COMP A TY 1 MIL SPEC SINGLE MATERIAL RESPONSE
•
THREAD LENGTH: 0.716 INCHES MINIMUM AND 0.847 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2S STYLE
•
SCREW MATERIAL: PLASTIC POLYHEXAMETHYLENE ADIPAMIDE
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONMIL-M-20693 COMP A TY 1 MIL SPEC SINGLE MATERIAL RESPONSE
THREAD LENGTH0.716 INCHES MINIMUM AND 0.847 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 2S STYLE
SCREW MATERIALPLASTIC POLYHEXAMETHYLENE ADIPAMIDE
SPECIAL FEATURESNATURAL COLOR
INTERNAL DRIVE STYLESLOT
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 3
MS18211-116CReference document
Same NSN cross-reference
Reference document — Secondary reference
AA55623-250Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
FF-S-92Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 508906?
508906 is a SCREW,MACHINE.
What parts can replace 508906?
There are 3 known substitutes for 508906: MS18211-116C, AA55623-250, FF-S-92. Substitute compatibility should be verified for your specific system.
What is the NSN for 508906?
508906 is cataloged in the U.S. Government catalog under NSN 5305-01-250-5233. 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.