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3M966-12 — NUT,PLAIN,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3M966-12: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 4140 OVERALL, nut_style: HEXAGONHEXAGON, nut_height: 0.312 INCHES NOMINAL0.312 INCHES NOMINAL IN, thread_class: 3B3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF), hardness_rating: 34.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-134-8731, 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
3M966-12
NSN: 5310-01-134-8731
FSC: 5310 — Nuts and Washers
CAGE: 38304 — REUSABLE ENVELOPE INC (CAN)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 4140 OVERALL
nut_styleHEXAGONHEXAGON
nut_height0.312 INCHES NOMINAL0.312 INCHES NOMINAL IN
thread_class3B3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
hardness_rating34.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentCADMIUM AND CADMIUM AND CHROMATE OVERALLCHROMATE OVERALL
width_across_flats1.125 INCHES NOMINAL1.125 INCHES NOMINAL IN
nominal_thread_size0.750 INCHES0.750 INCHES IN
bearing_surface_typeCHAMFEREDCHAMFERED
drilled_hole_diameter0.069 INCHES MINIMUM AND 0.069 INCHES MINIMUM AND 0.074 INCHES MAXIMUM0.074 INCHES MAXIMUM IN
NSN5310-01-134-8731
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3M966-12 · 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: 1.125 INCHES NOMINAL1.125 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALLQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM
•
HOLE CONFIGURATION STYLE: CONFIGURATION BCONFIGURATION B
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALLMIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
NOMINAL THREAD SIZE: 0.750 INCHES0.750 INCHES IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.125 INCHES NOMINAL1.125 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALLQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM
HOLE CONFIGURATION STYLECONFIGURATION BCONFIGURATION B
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALLMIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NOMINAL THREAD SIZE0.750 INCHES0.750 INCHES IN
NUT HEIGHT0.312 INCHES NOMINAL0.312 INCHES NOMINAL IN
DRILLED HOLE DIAMETER0.069 INCHES MINIMUM AND 0.069 INCHES MINIMUM AND 0.074 INCHES MAXIMUM0.074 INCHES MAXIMUM IN
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 2
3929AS1235-12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10109709Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 3M966-12?
3M966-12 is a NUT,PLAIN,HEXAGON.
What parts can replace 3M966-12?
There are 2 known substitutes for 3M966-12: 3929AS1235-12, 10109709. Substitute compatibility should be verified for your specific system.
What is the NSN for 3M966-12?
3M966-12 is cataloged in the U.S. Government catalog under NSN 5310-01-134-8731. 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.