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Technical Data Sheet
PartsTable / COMPONENT / 1 1/4-8UNC-3B, TYII
1 1/4-8UNC-3B, TYII ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The 1 1/4-8UNC-3B, TYII 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 5310-01-383-3195, 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
1 1/4-8UNC-3B, TYII
NSN: 5310-01-383-3195
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number1 1/4-8UNC-3B, TYII
NSN5310-01-383-3195
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1 1/4-8UNC-3B, TYII · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
THREAD CLASS: 3B
•
THREAD QUANTITY PER INCH: 8
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
CRITICALITY CODE JUSTIFICATIONZZZW
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
NOMINAL THREAD SIZE1.250 INCHES IN
THREAD CLASS3B
THREAD QUANTITY PER INCH8
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
24573N PIECE 22Interchangeable
interchangeable cross-reference
interchangeable
1/2-13 UNC-2B,TYPE 1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE IL1Interchangeable
interchangeable cross-reference
interchangeable
NP-652 PIECE 8L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 ASTM-A194 GR7L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 ASTM-A194 GR7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1 1/4-8UNC-3B, TYII?
1 1/4-8UNC-3B, TYII is a 1 1/4-8UNC-3B, TYII.
What parts can replace 1 1/4-8UNC-3B, TYII?
There are 7 known substitutes for 1 1/4-8UNC-3B, TYII: 24573N PIECE 22, 1/2-13 UNC-2B,TYPE 1, MIL-DTL-1222 TYPE IL1 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1 1/4-8UNC-3B, TYII?
1 1/4-8UNC-3B, TYII is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-383-3195. 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