PartsTable
Technical Data Sheet
3M961-5 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: DOUBLE HEXAGON, temp_rating: 1200.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.360 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-236-3114, 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
3M961-5
NSN: 5310-00-236-3114
FSC: 5310
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleDOUBLE HEXAGON
temp_rating1200.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.360 INCHES NOMINAL IN
hardness_rating48.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
nominal_thread_size0.312 INCHES IN
washer_outside_diameter0.419 INCHES NOMINAL IN
thread_quantity_per_inch24
NSN5310-00-236-3114
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3M961-5 · 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
MATERIAL: IRON ALLOY 660 OVERALL
PRECIOUS MATERIAL AND LOCATION: EXTERNAL SURFACE SILVER
TEMP RATING: 1200.0 FAHRENHEIT NOMINAL DEGF
NOMINAL THREAD SIZE: 0.312 INCHES IN
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM
THREAD QUANTITY PER INCH: 24
THREAD DIRECTION: RIGHT-HAND
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALIRON ALLOY 660 OVERALL
PRECIOUS MATERIAL AND LOCATIONEXTERNAL SURFACE SILVER
TEMP RATING1200.0 FAHRENHEIT NOMINAL DEGF
NOMINAL THREAD SIZE0.312 INCHES IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM
THREAD QUANTITY PER INCH24
THREAD DIRECTIONRIGHT-HAND
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TEST DATA DOCUMENT07482-398+3 DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
10121213Interchangeable
interchangeable cross-reference
interchangeable
387533Interchangeable
interchangeable cross-reference
interchangeable
LH3417-054Interchangeable
interchangeable cross-reference
interchangeable
H335Interchangeable
interchangeable cross-reference
interchangeable
H35-5Interchangeable
interchangeable cross-reference
interchangeable
65015-524Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3M961-5?
3M961-5 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 3M961-5?
There are 10 known substitutes for 3M961-5: 10121213, 387533, LH3417-054 and 7 more. Substitute compatibility should be verified for your specific system.
Is 3M961-5 still available?
3M961-5 is currently cancelled.
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