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Your search for "castle nut" revealed the following:

SP-150BT8-SQ-KITX2
2- Trailer Axle Spindle For 1 Inch ID Bearings fits 2000# Dexter ALKO Square BT8 (SP-150BT8-SQ-KITX2)
$71.52
Swivel Flange Nuts – 9/16"-18 Thread, Pack of 8 Part Number: Swivel Flange Lug Nuts - (TASL-N916-LOTOF8)
Swivel Flange Nuts – 9/16"-18 Thread, Pack of 8 Part Number: Swivel Flange Lug Nuts - (TASL-N916-LOTOF8)
$31.99
FlexiRide 3500# Spindle Arm EZ Lube FA-35 Torsion Trailer Axle Boat Flex Ryde UG (FA-35P LUBE-KIT)
FlexiRide 3500# Spindle Arm EZ Lube FA-35 Torsion Trailer Axle Boat Flex Ryde UG (FA-35P LUBE-KIT)
$73.14
7000# Build Your Own trailer Axle Kit w/8 x 6.5 Lug Hubs FLANGED Round Spindle (BYOAK-42FZ-H865-RO)
7000# Build Your Own trailer Axle Kit w/8 x 6.5 Lug Hubs FLANGED Round Spindle (BYOAK-42FZ-H865-RO)
$297.85
U-Bolt Nut Kit – 1/2"-20 Thread (Set of 32)
U-Bolt Nut Kit – 1/2"-20 Thread (Set of 32)
$14.77
STUB-84-555-H-SQ — 3,500 lb Square Stub Spindle Repair Kit
STUB-84-555-H-SQ — 3,500 lb Square Stub Spindle Repair Kit
$139.95
Build Your Own 3500 Electric Brake Trailer Axle Kit w/EZ Lube Spinde 5x4.75 Drum (BYOAK-84-D5475-2.0R)
Build Your Own 3500 Electric Brake Trailer Axle Kit w/EZ Lube Spinde 5x4.75 Drum (BYOAK-84-D5475-2.0R)
$299.99
Trailer Hub 8 Lug Bolt 6000# 7000# Axle with Bearings Seal 9/16" Studs idler axle (H4282655916-KIT)
Trailer Hub 8 Lug Bolt 6000# 7000# Axle with Bearings Seal 9/16" Studs idler axle (H4282655916-KIT)
$69.99
FOUR 1750# EZ Lube 2" Round #84 Spindle 3500# Axle fits Dexter ALKO Axis Trailer (SP-20084FZ-X4)
FOUR 1750# EZ Lube 2" Round #84 Spindle 3500# Axle fits Dexter ALKO Axis Trailer (SP-20084FZ-X4)
$161.74
Build Your Own Axle Hub Kit with 4x4 Hubs 2000# and Round Spindles (BYOAK-BT8-H440-R)
Build Your Own Axle Hub Kit with 4x4 Hubs 2000# and Round Spindles (BYOAK-BT8-H440-R)
$112.99
Trailer Axle Spring Eye Suspension Bolt for Slipper Springs 5-1/2" Long 1" 7-169 (7-169-6-112)
Trailer Axle Spring Eye Suspension Bolt for Slipper Springs 5-1/2" Long 1" 7-169 (7-169-6-112)
$13.03
U-Bolt Nut, 1/2"-20, Fits 2000# / UB-R200 / UB-R201 / UB-R301 / UB-R302 (12N)
U-Bolt Nut, 1/2"-20, Fits 2000# / UB-R200 / UB-R201 / UB-R301 / UB-R302 (12N)
$7.99