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Your search for "castle nut" revealed the following:

BYOAK-42FZ-H655-RO
6000# Build Your Own trailer Axle Kit w/6 x 5.5 Lug Hubs FLANGED Round Spindle (BYOAK-42FZ-H655-RO)
$258.67
846551-KIT
1- 6x5.5 Idler Hub w/ 3500# Bearing Kit Replace Trailer Axle fits Dexter ALKO (846551-KIT)
$55.99
825607-KIT
1- Genuine Dexter 5x5 Hub with 3500# Bearing Kit Replace Trailer Idler Axle (825607-KIT)
$74.99
K71-384-00
Dexter 3500# Under/Over Conversion Trailer Axle Flip Kit RV Camper 2.375" Tube (K71-384-00)
$98.36
LJB5601100
7 way Trailer Wire Cord Junction Box, COLOR CODED Truck weather proof connect (LJB5601100)
$13.18
UBK-2000-SQ-612
2-1/8" x 6-1/2" Square U Bolt Kit with Plates Trailer Boat Axles 1/2" 2 x 3 Tube (UBK-2000-SQ-612)
$59.67
Battery Solenoid Switch 4 Terminal 12 Volt Continuous Duty for Dump Pumps (BSC4)
Battery Solenoid Switch 4 Terminal 12 Volt Continuous Duty for Dump Pumps (BSC4)
$28.33
Basic Kit 5 x 5 Drum 3500# 10" Electric Backing Plate Right Side Only Trailer (94550-B-IMP-R)
Basic Kit 5 x 5 Drum 3500# 10" Electric Backing Plate Right Side Only Trailer (94550-B-IMP-R)
$95.99
SRK-TA-SB-35
Tandem Axle Trailer Spring Suspension Rebuild Kit 7k 14k Camper Repair 3.5" Shkl (SRK-TA-SB-35)
$30.84
NEV-R-LUBE Bearing Kit 35mm Cartrige with attaching components 3.5k (K71-996-00)
NEV-R-LUBE Bearing Kit 35mm Cartrige with attaching components 3.5k (K71-996-00)
$243.56
7,000 lb Trailer Axle Beam Kit 79" Hub Face Straight 3" Tube (7000-79-3-KIT)
7,000 lb Trailer Axle Beam Kit 79" Hub Face Straight 3" Tube (7000-79-3-KIT)
$318.62
k71-165-00
12 1/4 X 3 3/8 BRAKE SHOE & LINING HYDRAULIC LEFT Hand 8K 10K GD (k71-165-00)
$145.99