PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 303105
303105 ✓ 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: 0.880 INCHES NOMINAL IN, thread_class: 2B, thread_series: UN, hardness_rating: 88.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-637-7760, 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
303105
NSN: 5310-00-637-7760
FSC: 5310
CAGE: 56697 — STANDARD FORGE AND AXLE CO INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSINGLE BALL SEAT, HEXAGON
nut_height0.880 INCHES NOMINAL IN
thread_class2B
thread_seriesUN
hardness_rating88.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM
ball_seat_radius0.875 INCHES NOMINAL IN
thread_directionLEFT-HAND
surface_treatmentZINC AND CHROMATE OVERALL EXCEPT THREADS
width_across_flats1.485 INCHES NOMINAL IN
nominal_thread_size1.125 INCHES IN
thread_quantity_per_inch16
NSN5310-00-637-7760
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 303105 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
43812Interchangeable
interchangeable cross-reference
interchangeable
37892Interchangeable
interchangeable cross-reference
interchangeable
D229059CInterchangeable
interchangeable cross-reference
interchangeable
16022Interchangeable
interchangeable cross-reference
interchangeable
B107.100Interchangeable
interchangeable cross-reference
interchangeable
AS954Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy 303105?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 303105?
303105 is a NUT,PLAIN,SINGLE BALL SEAT,HEXAG.
What parts can replace 303105?
There are 22 known substitutes for 303105: 43812, 37892, D229059C and 19 more. Substitute compatibility should be verified for your specific system.
Is 303105 still available?
303105 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 303105

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026