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61170M-820 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

61170M-820: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), surface_treatment: DISULFIDE MOLYBDENUM OVERALL, nominal_thread_size: 0.500 INCHES IN, thread_quantity_per_inch: 20. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-554-8183, 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
61170M-820
NSN: 5310-01-554-8183
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
surface_treatmentDISULFIDE MOLYBDENUM OVERALL
nominal_thread_size0.500 INCHES IN
thread_quantity_per_inch20
NSN5310-01-554-8183
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 61170M-820 · 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 JOINT FINE (UNJF)
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
SURFACE TREATMENT: DISULFIDE MOLYBDENUM OVERALL
•
THREAD CLASS: 3B
•
THREAD QUANTITY PER INCH: 20
•
MATERIAL: IRON ALLOY 660 OVERALL
TECHNICAL CHARACTERISTICS
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
NOMINAL THREAD SIZE0.500 INCHES IN
SURFACE TREATMENTDISULFIDE MOLYBDENUM OVERALL
THREAD CLASS3B
THREAD QUANTITY PER INCH20
MATERIALIRON ALLOY 660 OVERALL
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 61170M-820?
61170M-820 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What is the NSN for 61170M-820?
61170M-820 is cataloged in the U.S. Government catalog under NSN 5310-01-554-8183. 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.