PartsTable
Technical Data Sheet
PartsTable / COMPONENT / H81-1/4-20 X 4
H81-1/4-20 X 4 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The H81-1/4-20 X 4 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-817-6139, 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
H81-1/4-20 X 4
NSN: 5305-00-817-6139
FSC: 5305
CAGE: 52374 — FLOWSERVE CORP DBA AUTOMAX ACTUATORS DIV FLOWSERVE US COMPANY (USA)
SPECIFICATIONS
Part NumberH81-1/4-20 X 4
NSN5305-00-817-6139
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: H81-1/4-20 X 4 · 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
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 4 STYLE
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD QUANTITY PER INCH20
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 4 STYLE
WIDTH ACROSS FLATS0.125 INCHES NOMINAL IN
INTERNAL DRIVE STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
8344Interchangeable
interchangeable cross-reference
interchangeable
PRP902-53-718-40Interchangeable
interchangeable cross-reference
interchangeable
FC4960Interchangeable
interchangeable cross-reference
interchangeable
2100591Interchangeable
interchangeable cross-reference
interchangeable
F4960Interchangeable
interchangeable cross-reference
interchangeable
5999FInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy H81-1/4-20 X 4?
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 H81-1/4-20 X 4?
H81-1/4-20 X 4 is a H81-1/4-20 X 4.
What parts can replace H81-1/4-20 X 4?
There are 19 known substitutes for H81-1/4-20 X 4: 8344, PRP902-53-718-40, FC4960 and 16 more. Substitute compatibility should be verified for your specific system.
Is H81-1/4-20 X 4 still available?
H81-1/4-20 X 4 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — H81-1/4-20 X 4

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026