PartsTable
Technical Data Sheet
Download PDF

HT8177-7D25 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HT8177-7D25: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.4360 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN, head_diameter: 0.880 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-013-9599, 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
HT8177-7D25
NSN: 5305-01-013-9599
FSC: 5305 — Screws
CAGE: C4293 — FAIRCHILD FASTENERS EUROPE - VSD GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNK
grip_length1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.4360 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
head_diameter0.880 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
thread_length0.466 INCHES NOMINAL IN
fastener_length2.012 INCHES MINIMUM AND 2.059 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
surface_treatmentCADMIUM OVERALL
internal_drive_styleHIGH-TORQUE
NSN5305-01-013-9599
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT8177-7D25 · 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: 2.012 INCHES MINIMUM AND 2.059 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MAC PS13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.466 INCHES NOMINAL IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN
•
NOMINAL THREAD DIAMETER: 0.438 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
SPECIFICATION/STANDARD DATA: 76301-ST3-562 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
TECHNICAL CHARACTERISTICS
FASTENER LENGTH2.012 INCHES MINIMUM AND 2.059 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMAC PS13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.466 INCHES NOMINAL IN
SHANK UNTHREADED HOLE DIAMETER0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN
NOMINAL THREAD DIAMETER0.438 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
SPECIFICATION/STANDARD DATA76301-ST3-562 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
GRIP LENGTH1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN
GRIP DIAMETER0.4360 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
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
73991H-7D25Reference document
Same NSN cross-reference
Reference document — Secondary reference
HT309-7D25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
BM19031-7-25DSame 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
Ready to buy HT8177-7D25?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is HT8177-7D25?
HT8177-7D25 is a SCREW,CLOSE TOLERANCE.
What parts can replace HT8177-7D25?
There are 3 known substitutes for HT8177-7D25: 73991H-7D25, HT309-7D25, BM19031-7-25D. Substitute compatibility should be verified for your specific system.
What is the NSN for HT8177-7D25?
HT8177-7D25 is cataloged in the U.S. Government catalog under NSN 5305-01-013-9599. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — HT8177-7D25

✓ 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.