PartsTable
Technical Data Sheet
7803-1978 ✓ 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,PLAIN,SINGLE BALL SEAT,HEXAG. Key specifications include material: STEEL OVERALL, nut_style: SINGLE BALL SEAT, HEXAGON, nut_height: 0.875 INCHES NOMINAL IN, ball_seat_radius: 0.875 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, surface_treatment: ZINC OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-161-9964, 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
7803-1978
NSN: 5310-00-161-9964
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSINGLE BALL SEAT, HEXAGON
nut_height0.875 INCHES NOMINAL IN
ball_seat_radius0.875 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats1.475 INCHES MINIMUM AND 1.495 INCHES MAXIMUM IN
nominal_thread_size1.125 INCHES IN
end_item_identificationMRAP - COMMON NSN - USED ON 4 MRAP VARIANTS AND 8 OTHER WEAPON SYSTEMS.; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
thread_quantity_per_inch16
part_name_assigned_by_controlling_agencyNUT, CAP
NSN5310-00-161-9964
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7803-1978 · 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: 1.475 INCHES MINIMUM AND 1.495 INCHES MAXIMUM IN
BALL SEAT RADIUS: 0.875 INCHES NOMINAL IN
NOMINAL THREAD SIZE: 1.125 INCHES IN
NUT STYLE: SINGLE BALL SEAT, HEXAGON
THREAD DIRECTION: RIGHT-HAND
THREAD QUANTITY PER INCH: 16
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.475 INCHES MINIMUM AND 1.495 INCHES MAXIMUM IN
BALL SEAT RADIUS0.875 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT, CAP
NOMINAL THREAD SIZE1.125 INCHES IN
NUT STYLESINGLE BALL SEAT, HEXAGON
THREAD DIRECTIONRIGHT-HAND
END ITEM IDENTIFICATIONMRAP - COMMON NSN - USED ON 4 MRAP VARIANTS AND 8 OTHER WEAPON SYSTEMS.; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
THREAD QUANTITY PER INCH16
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
20-207Interchangeable
interchangeable cross-reference
interchangeable
150-419YPC207Interchangeable
interchangeable cross-reference
interchangeable
150-433YITEM50Interchangeable
interchangeable cross-reference
interchangeable
7207C1TX9Interchangeable
interchangeable cross-reference
interchangeable
7207Interchangeable
interchangeable cross-reference
interchangeable
177003-23Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7803-1978?
7803-1978 is a NUT,PLAIN,SINGLE BALL SEAT,HEXAG.
What parts can replace 7803-1978?
There are 20 known substitutes for 7803-1978: 20-207, 150-419YPC207, 150-433YITEM50 and 17 more. Substitute compatibility should be verified for your specific system.
Is 7803-1978 still available?
7803-1978 is currently cancelled.
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