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ST3M612C16M — NUT,PLAIN,EXTENDED WASHER,DOUBLE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST3M612C16M: NUT,PLAIN,EXTENDED WASHER,DOUBLE.

NUT,PLAIN,EXTENDED WASHER,DOUBLE. Key specifications include material: NICKEL ALLOY 718 OVERALL, nut_style: DOUBLE HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 1.101 INCHES MAXIMUM IN, special_features: SIX SLOTS EVENLY SPACED 0.156 IN. MIN AND 0.187 IN.

MAX WIDTH IN. This part is cataloged in the U.S. Government catalog under NSN 5310-01-147-0798, 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
ST3M612C16M
NSN: 5310-01-147-0798
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
nut_styleDOUBLE HEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height1.101 INCHES MAXIMUM IN
special_featuresSIX SLOTS EVENLY SPACED 0.156 IN. MIN AND 0.187 IN. MAX WIDTH IN
thread_directionRIGHT-HAND
washer_thickness0.255 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
width_across_flats1.178 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
nominal_thread_size1.000 INCHES IN
washer_outside_diameter1.625 INCHES MAXIMUM IN
NSN5310-01-147-0798
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M612C16M · 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
•
WASHER OUTSIDE DIAMETER: 1.625 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 1.178 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
WASHER THICKNESS: 0.255 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.101 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER1.625 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.178 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
WASHER THICKNESS0.255 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.000 INCHES IN
SPECIAL FEATURESSIX SLOTS EVENLY SPACED 0.156 IN. MIN AND 0.187 IN. MAX WIDTH IN
SURFACE TREATMENTPASSIVATE 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 1
74384-16MReference document
Same NSN cross-reference
Reference document — Secondary reference
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 ST3M612C16M?
ST3M612C16M is a NUT,PLAIN,EXTENDED WASHER,DOUBLE.
What parts can replace ST3M612C16M?
There is 1 known substitute for ST3M612C16M: 74384-16M. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M612C16M?
ST3M612C16M is cataloged in the U.S. Government catalog under NSN 5310-01-147-0798. 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.