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66904H4-25 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

66904H4-25: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 0.371 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-345-2269, 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
66904H4-25
NSN: 5305-00-345-2269
FSC: 5305 — Screws
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.371 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.944 INCHES MINIMUM AND 1.990 INCHES MAXIMUM IN
shoulder_length1.458 INCHES MINIMUM AND 1.478 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
shoulder_diameter0.2797 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCADMIUM OVERALL
NSN5305-00-345-2269
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 66904H4-25 · 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: 1.944 INCHES MINIMUM AND 1.990 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.458 INCHES MINIMUM AND 1.478 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: PS13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.2797 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.371 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: 23-105,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH1.944 INCHES MINIMUM AND 1.990 INCHES MAXIMUM IN
SHOULDER LENGTH1.458 INCHES MINIMUM AND 1.478 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONPS13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.2797 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.371 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATION23-105,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
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
ST3M547-4-25Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
HT308-4-25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
HS2623-4Z25YReference document
Same NSN cross-reference
Reference document — Secondary reference
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 66904H4-25?
66904H4-25 is a SCREW,SHOULDER.
What parts can replace 66904H4-25?
There are 3 known substitutes for 66904H4-25: ST3M547-4-25, HT308-4-25, HS2623-4Z25Y. Substitute compatibility should be verified for your specific system.
What is the NSN for 66904H4-25?
66904H4-25 is cataloged in the U.S. Government catalog under NSN 5305-00-345-2269. 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.