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Technical Data Sheet
PartsTable / COMPONENT / 1 1/4-8UN-2BL1
1 1/4-8UN-2BL1 ✓ 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 1/4-8UN-2BL1 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 5310-01-386-9797, 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 1/4-8UN-2BL1
NSN: 5310-01-386-9797
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
Part Number1 1/4-8UN-2BL1
NSN5310-01-386-9797
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1 1/4-8UN-2BL1 · 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
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
THREAD QUANTITY PER INCH: 8
•
THREAD CLASS: 2B
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
CRITICALITY CODE JUSTIFICATIONZZZW
THREAD QUANTITY PER INCH8
THREAD CLASS2B
NOMINAL THREAD SIZE1.250 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
MIL-DTL-1222 TYPE IIIL1Interchangeable
interchangeable cross-reference
interchangeable
655-8803PCF11L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 GR500L1Interchangeable
interchangeable cross-reference
interchangeable
9/16-12UNC-2BL1Interchangeable
interchangeable cross-reference
interchangeable
803-2177525-M5XX-12Interchangeable
interchangeable cross-reference
interchangeable
803-2177525-M5XX-12L1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1 1/4-8UN-2BL1?
1 1/4-8UN-2BL1 is a 1 1/4-8UN-2BL1.
What parts can replace 1 1/4-8UN-2BL1?
There are 26 known substitutes for 1 1/4-8UN-2BL1: MIL-DTL-1222 TYPE IIIL1, 655-8803PCF11L1, MIL-DTL-1222 GR500L1 and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1 1/4-8UN-2BL1?
1 1/4-8UN-2BL1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-386-9797. 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