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1B6161 ✓ 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 WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL, thread_length: 1.219 INCHES NOMINAL NUT THREAD IN, overall_length: 3.469 INCHES NOMINAL IN, hardness_rating: 18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM, shoulder_length: 0.188 INCHES NOMINAL IN, style_designator: SHOULDERED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-484-5739, 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
1B6161
NSN: 5310-00-484-5739
FSC: 5310
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL
thread_length1.219 INCHES NOMINAL NUT THREAD IN
overall_length3.469 INCHES NOMINAL IN
hardness_rating18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM
shoulder_length0.188 INCHES NOMINAL IN
style_designatorSHOULDERED
thread_directionRIGHT-HAND STUD THREAD
shoulder_diameter1.125 INCHES NOMINAL IN
nominal_thread_size0.750 INCHES STUD THREAD IN
nut_end_shank_length0.875 INCHES NOMINAL IN
distance_across_flats0.938 INCHES NOMINAL IN
stud_end_shank_length0.115 INCHES NOMINAL IN
NSN5310-00-484-5739
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1B6161 · 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
•
INTERNAL PREBENT KEY LENGTH: 0.125 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.062 INCHES NOMINAL IN
•
HOLE DIAMETER: 2.360 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 19
•
OVERALL DISTANCE INCLUDING KEYS: 3.562 INCHES NOMINAL IN
•
INTERNAL PREBENT KEY WIDTH: 0.262 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 3.295 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL PREBENT KEY LENGTH0.125 INCHES NOMINAL IN
MATERIAL THICKNESS0.062 INCHES NOMINAL IN
HOLE DIAMETER2.360 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY19
OVERALL DISTANCE INCLUDING KEYS3.562 INCHES NOMINAL IN
INTERNAL PREBENT KEY WIDTH0.262 INCHES NOMINAL IN
OUTSIDE DIAMETER3.295 INCHES NOMINAL IN
STYLE DESIGNATORKEY
EXTERNAL PREBENT KEY WIDTH0.230 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
12676Interchangeable
interchangeable cross-reference
interchangeable
SFP156Interchangeable
interchangeable cross-reference
interchangeable
13097EInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1B6161?
1B6161 is a WASHER,KEY.
What parts can replace 1B6161?
There are 3 known substitutes for 1B6161: 12676, SFP156, 13097E. Substitute compatibility should be verified for your specific system.
What is the NSN for 1B6161?
1B6161 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-484-5739. 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