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Technical Data Sheet
PartsTable / COMPONENT / 181766
181766 ✓ 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 NIPPLE,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.469 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.500 INCHES MINIMUM IN, fastener_length: 1.750 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-1766, 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
181766
NSN: 5305-00-018-1766
FSC: 5305
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.469 INCHES NOMINAL IN
thread_class2A A
thread_length1.500 INCHES MINIMUM IN
fastener_length1.750 INCHES NOMINAL IN
hardness_rating23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_between_flats0.860 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
nominal_thread_diameter0.625 INCHES IN
minimum_tensile_strength120000 POUNDS PER SQUARE INCH LBS
NSN5305-00-018-1766
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 181766 · 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
•
FASTENER LENGTH: 1.750 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
MATERIAL: STEEL OVERALL
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
•
MINIMUM TENSILE STRENGTH: 120000 POUNDS PER SQUARE INCH LBS
•
WIDTH BETWEEN FLATS: 0.860 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 10P STYLE AND 5 GRADE
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH1.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
MATERIALSTEEL OVERALL
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH120000 POUNDS PER SQUARE INCH LBS
WIDTH BETWEEN FLATS0.860 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE AND 5 GRADE
THREAD SERIES DESIGNATORUNF
HEAD STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
4730000900832Interchangeable
interchangeable cross-reference
interchangeable
4-2 010103BInterchangeable
interchangeable cross-reference
interchangeable
42578VInterchangeable
interchangeable cross-reference
interchangeable
105633Interchangeable
interchangeable cross-reference
interchangeable
181766Interchangeable
interchangeable cross-reference
interchangeable
426712Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 181766?
181766 is a NIPPLE,TUBE.
What parts can replace 181766?
There are 13 known substitutes for 181766: 4730000900832, 4-2 010103B, 42578V and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 181766?
181766 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-1766. 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