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Technical Data Sheet
PartsTable / COMPONENT / 81964
81964 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SWITCH,PRESSURE is a the manufacturer industrial component. Key specifications include head_style: HEXAGON EXTENDED WASHER, head_height: 0.277 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.750 INCHES NOMINAL IN, overall_length: 5.150 INCHES MINIMUM AND 5.650 INCHES MAXIMUM IN, proof_pressure: 600.00 POUNDS PER SQUARE INCH LBS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-146-2677, 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
81964
NSN: 5306-00-146-2677
FSC: 5306
CAGE: 24930 — L3HARRIS TECHNOLOGIES, INC DIV SPACE & AIRBORNE SYSTEMS (USA)
SPECIFICATIONS
head_styleHEXAGON EXTENDED WASHER
head_height0.277 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
thread_class3A A
thread_length0.750 INCHES NOMINAL IN
overall_length5.150 INCHES MINIMUM AND 5.650 INCHES MAXIMUM IN
proof_pressure600.00 POUNDS PER SQUARE INCH LBS
fastener_length2.438 INCHES NOMINAL IN
overall_diameter0.590 INCHES MINIMUM AND 0.600 INCHES MAXIMUM IN
frequency_in_hertz60.0 SINGLE VOLTAGE
width_between_flats0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
operating_temp_rating-65.0 FAHRENHEIT MINIMUM AND 273.0 FAHRENHEIT MAXIMUM DEGF
extended_washer_diameter0.805 INCHES MINIMUM AND 0.827 INCHES MAXIMUM IN
NSN5306-00-146-2677
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 81964 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 1.623 INCHES NOMINAL IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER: 0.185 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.277 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
•
EXTENDED WASHER THICKNESS: 0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.750 INCHES NOMINAL IN
•
SECOND DIAMETER FROM HEAD: 0.295 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN
•
WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
•
THREAD CLASS: 3A A
TECHNICAL CHARACTERISTICS (FLIS)
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER1.623 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.185 INCHES NOMINAL IN
HEAD HEIGHT0.277 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
EXTENDED WASHER THICKNESS0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
THREAD LENGTH0.750 INCHES NOMINAL IN
SECOND DIAMETER FROM HEAD0.295 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
THREAD CLASS3A A
EXTENDED WASHER DIAMETER0.805 INCHES MINIMUM AND 0.827 INCHES MAXIMUM IN
FASTENER LENGTH2.438 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
365703-4Interchangeable
interchangeable cross-reference
interchangeable
8196-4Interchangeable
interchangeable cross-reference
interchangeable
365703-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81964?
81964 is a SWITCH,PRESSURE.
What parts can replace 81964?
There are 3 known substitutes for 81964: 365703-4, 8196-4, 365703-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 81964?
81964 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-146-2677. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026