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Technical Data Sheet
PartsTable / COMPONENT / 7/8-9UNC-3A X 51/2 TYIV CLASS
7/8-9UNC-3A X 51/2 TYIV CLASS ✓ 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 7/8-9UNC-3A X 51/2 TYIV CLASS is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-306-7533, 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
7/8-9UNC-3A X 51/2 TYIV CLASS
NSN: 5307-01-306-7533
FSC: 5307
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number7/8-9UNC-3A X 51/2 TYIV CLASS
NSN5307-01-306-7533
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 7/8-9UNC-3A X 51/2 TYIV CLASS · 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
•
THREAD QUANTITY PER INCH: 9 LOCATION NOT OTHERWISE SPECIFIED
•
NONDEFINITIVE SPEC/STD DATA: IV TYPE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
•
NOMINAL THREAD SIZE: 0.875 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
•
CRITICALITY CODE JUSTIFICATION: ZZZX
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH9 LOCATION NOT OTHERWISE SPECIFIED
NONDEFINITIVE SPEC/STD DATAIV TYPE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
NOMINAL THREAD SIZE0.875 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
CRITICALITY CODE JUSTIFICATIONZZZX
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
OVERALL LENGTH5.500 INCHES NOMINAL IN
THREAD CLASS3A LOCATION NOT OTHERWISE SPECIFIED A
MATERIALNICKEL ALLOY 400
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
7/8-9UNC-2A X 4IN CLASS A TYPL1Interchangeable
interchangeable cross-reference
interchangeable
MS35311-217Interchangeable
interchangeable cross-reference
interchangeable
MS35311-217L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 QQ-N-281 GR400L1Interchangeable
interchangeable cross-reference
interchangeable
3/4-10UNC-2A X 2 3/4 TYPE 1 CLL1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 QQ-N-281 GR400Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7/8-9UNC-3A X 51/2 TYIV CLASS?
7/8-9UNC-3A X 51/2 TYIV CLASS is a 7/8-9UNC-3A X 51/2 TYIV CLASS.
What parts can replace 7/8-9UNC-3A X 51/2 TYIV CLASS?
There are 18 known substitutes for 7/8-9UNC-3A X 51/2 TYIV CLASS: 7/8-9UNC-2A X 4IN CLASS A TYPL1, MS35311-217, MS35311-217L1 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 7/8-9UNC-3A X 51/2 TYIV CLASS?
7/8-9UNC-3A X 51/2 TYIV CLASS is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-306-7533. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026