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66910139-1 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

66910139-1: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include nut_diameter: 0.220 INCHES NOMINAL IN, thread_class: 3B, nut_thickness: 0.270 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND, width_across_flats: 0.145 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-417-1084, 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
66910139-1
NSN: 5310-01-417-1084
FSC: 5310 — Nuts and Washers
CAGE: 34860 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
nut_diameter0.220 INCHES NOMINAL IN
thread_class3B
nut_thickness0.270 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.145 INCHES NOMINAL IN
nominal_thread_size0.086 INCHES IN
thread_quantity_per_inch56
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
NSN5310-01-417-1084
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 66910139-1 · 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: 0.145 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.086 INCHES IN
•
NUT DIAMETER: 0.220 INCHES NOMINAL IN
•
NUT THICKNESS: 0.270 INCHES NOMINAL IN
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.145 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.086 INCHES IN
NUT DIAMETER0.220 INCHES NOMINAL IN
NUT THICKNESS0.270 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
THREAD CLASS3B
THREAD QUANTITY PER INCH56
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 66910139-1?
66910139-1 is a NUT,PLAIN,ROUND.
What is the NSN for 66910139-1?
66910139-1 is cataloged in the U.S. Government catalog under NSN 5310-01-417-1084. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.