PartsTable
Technical Data Sheet
Download PDF

B188420 — NUT,PLAIN,OCTAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

B188420: NUT,PLAIN,OCTAGON.

The NUT,PLAIN,OCTAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, nut_style: PLAIN, OCTAGON, nut_height: 0.359 INCHES NOMINAL IN, thread_class: 2B, thread_series: UN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-374-2133, 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
B188420
NSN: 5310-00-374-2133
FSC: 5310 — Nuts and Washers
CAGE: 76040 — MACK TRUCKS INC PARTS OPN (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
nut_stylePLAIN, OCTAGON
nut_height0.359 INCHES NOMINAL IN
thread_class2B
thread_seriesUN
thread_directionRIGHT-HAND
features_providedCASEHARDENED
width_across_flats3.812 INCHES NOMINAL IN
nominal_thread_size2.625 INCHES IN
bearing_surface_typeCHAMFERED
drilled_hole_diameter0.257 INCHES NOMINAL IN
hole_type_and_quantity1 DRILLED
NSN5310-00-374-2133
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B188420 · 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
•
WIDTH ACROSS FLATS: 3.812 INCHES NOMINAL IN
•
THREAD SERIES: UN
•
HOLE CONFIGURATION STYLE: CONFIGURATION H
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FEATURES PROVIDED: CASEHARDENED
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.625 INCHES IN
•
NUT HEIGHT: 0.359 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS3.812 INCHES NOMINAL IN
THREAD SERIESUN
HOLE CONFIGURATION STYLECONFIGURATION H
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FEATURES PROVIDEDCASEHARDENED
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.625 INCHES IN
NUT HEIGHT0.359 INCHES NOMINAL IN
DRILLED HOLE DIAMETER0.257 INCHES NOMINAL IN
NUT STYLEPLAIN, OCTAGON
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy B188420?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is B188420?
B188420 is a NUT,PLAIN,OCTAGON.
What is the NSN for B188420?
B188420 is cataloged in the U.S. Government catalog under NSN 5310-00-374-2133. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — B188420

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.