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3866251 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

3866251: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL PROPERTY CLASS 10.9 OVERALL, head_style: HEXAGON EXTENDED WASHER, head_height: 17.1 MILLIMETERS MAXIMUM MM, thread_length: 52.0 MILLIMETERS NOMINAL MM, screw_material: STEEL PROPERTY CLASS 10.9, fastener_length: 170.0 MILLIMETERS NOMINAL MM. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-609-3986, 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
3866251
NSN: 5306-01-609-3986
NIINs: 016093986, 016093991, 016094008, 016516433, 016516444, 016519019, 016521342, 016523194, 016613883, 016733410, 016942928, 017162305, 017162310
FSC: 5306 — Bolts
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL PROPERTY CLASS 10.9 OVERALL
head_styleHEXAGON EXTENDED WASHER
head_height17.1 MILLIMETERS MAXIMUM MM
thread_length52.0 MILLIMETERS NOMINAL MM
screw_materialSTEEL PROPERTY CLASS 10.9
fastener_length170.0 MILLIMETERS NOMINAL MM
special_featuresFINISH: D60, TYPE I PER FM100
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_between_flats26.7 MILLIMETERS MINIMUM AND 27.0 MILLIMETERS MAXIMUM MM
end_item_identification4210-01-622-0440
nominal_thread_diameter20.0 MILLIMETERS MM
NSN5306-01-609-3986
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3866251 · 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
SUBSTITUTES & CROSS-REFERENCES 2
3866251010Reference document
Same NSN cross-reference
Reference document — Secondary reference
12414307-197Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 3866251?
3866251 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 3866251?
There are 2 known substitutes for 3866251: 3866251010, 12414307-197. Substitute compatibility should be verified for your specific system.
What is the NSN for 3866251?
3866251 is cataloged in the U.S. Government catalog under NSN 5306-01-609-3986. 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.