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Your search for "spindle castle nut" revealed the following:

Oil Bearing Kit 8000# Axle #42 Spindle 02475 22580 8K Dexter Trailer 21-35 cap (BK-8000-OC)
Oil Bearing Kit 8000# Axle #42 Spindle 02475 22580 8K Dexter Trailer 21-35 cap (BK-8000-OC)
$41.20
ONE Axle stub end 2000# 4 x 4 Hub Axel Kit with Square Spindles Side car Trailer (BYOAK-BT8-H440-SQ-ONE)
ONE Axle stub end 2000# 4 x 4 Hub Axel Kit with Square Spindles Side car Trailer (BYOAK-BT8-H440-SQ-ONE)
$65.99
U-Bolt Nut Kit, 1/2"-20 (Set of 16) – Fits 2000# Axles | UB-R200 / R201 / R301 / R302 (12N-LOTOF16)
U-Bolt Nut Kit, 1/2"-20 (Set of 16) – Fits 2000# Axles | UB-R200 / R201 / R301 / R302 (12N-LOTOF16)
$14.77
BYOAK-84-H545-2.0R
Build your own 3500# 5x4.5 Hubs Trailer Axle Kit with Round SP-20084 Spindles (BYOAK-84-H545-2.0R)
$120.87
Two- 5 x 4.5 Replacement Idler Hub Spindle Kit w/BRAKE FLG Trailer Axle 3500# 84 (STUB-84FZ-545-H-X2)
Two- 5 x 4.5 Replacement Idler Hub Spindle Kit w/BRAKE FLG Trailer Axle 3500# 84 (STUB-84FZ-545-H-X2)
$159.73
SP25042FZ-2
TWO Trailer Axle Spindle #42 6000# 7000# W/ Brake flange EZ Lube Hub Stub shaft (SP25042FZ-2)
$177.99
U-Bolt Nut Kit, 1/2"-20 (Set of 8) – Fits 2000# Axles | UB-R200 / R201 / R301 / R302 (12N-LOTOF8)
U-Bolt Nut Kit, 1/2"-20 (Set of 8) – Fits 2000# Axles | UB-R200 / R201 / R301 / R302 (12N-LOTOF8)
$10.49
Cotter Pins 1/8" × 1-3/4" — Lot of 10 for Standard 1" Spindle Ends (165649-LOTOF10)
Cotter Pins 1/8" × 1-3/4" — Lot of 10 for Standard 1" Spindle Ends (165649-LOTOF10)
$8.36
TWO - 3500#Axle Trailer Brake Backing Plate Mount Flange Fits 1-3/4 size spindle axel (363993-LOTOF2)
TWO - 3500#Axle Trailer Brake Backing Plate Mount Flange Fits 1-3/4 size spindle axel (363993-LOTOF2)
$20.77
824805-KIT
Genuine Dexter 5 on 4 1/2 Lug Trailer Hub 3500# Axle Complete Kit Wheel Idler (824805-KIT)
$72.68
Lippert Hub 10K HD Post-2020 SHORT SPINDLE 4.77" Pilot LCI 4" Cap 10,000# Trailer Axle (791398-KIT)
Lippert Hub 10K HD Post-2020 SHORT SPINDLE 4.77" Pilot LCI 4" Cap 10,000# Trailer Axle (791398-KIT)
$268.63
BYOAK-84-H550-2.0R
Build your own 3500# Trailer Axle Kit 5x5.0 Hubs Round SP-20084 Spindles (BYOAK-84-H550-2.0R)
$134.25