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

MAT 3,500K Trailer Wheel Bearing Kit – Fits 3,500 lb Axles -1.063" x 1.378" Spindle (BEK-3.5K)
MAT 3,500K Trailer Wheel Bearing Kit – Fits 3,500 lb Axles -1.063" x 1.378" Spindle (BEK-3.5K)
$19.95
Lippert Hub 10K HD Post-2020 SHORT SPINDLE 4.77" Pilot LCI 2 Piece 10,000# Trailer Axle (791398-Cap-Kit)
Lippert Hub 10K HD Post-2020 SHORT SPINDLE 4.77" Pilot LCI 2 Piece 10,000# Trailer Axle (791398-Cap-Kit)
$238.84
Dexter Single Lip Grease Seal – 2.375" ID × 3.623" OD – #99 Spindle (T51153)
Dexter Single Lip Grease Seal – 2.375" ID × 3.623" OD – #99 Spindle (T51153)
$12.34
Radius Rod Adjustable with Bushings 1"-14 x 5" Bolt 1-14 UNS Flanged Locknut HDSS Hutch Hutchens (SHU-71305-KIT)
Radius Rod Adjustable with Bushings 1"-14 x 5" Bolt 1-14 UNS Flanged Locknut HDSS Hutch Hutchens (SHU-71305-KIT)
$89.97
Hub, 10K DISC brake axle 4.77 HUB ONLY (008-214-06)
Hub, 10K DISC brake axle 4.77 HUB ONLY (008-214-06)
$333.15
UFP O-Ring – 2.125" Spindle – 5.2K–7K Trailer Axles (32738U)
UFP O-Ring – 2.125" Spindle – 5.2K–7K Trailer Axles (32738U)
$2.79
Hub Drum ALKO & Rockwell 10K HD #120 Spindle Rockwell 4.77 Pilot Fits ALKO Cast #8900 8-491 (120865-1P475A)
Hub Drum ALKO & Rockwell 10K HD #120 Spindle Rockwell 4.77 Pilot Fits ALKO Cast #8900 8-491 (120865-1P475A)
$662.99
Equalizer for 2" Wide Slipper Springs 12" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-12-LN-KIT)
Equalizer for 2" Wide Slipper Springs 12" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-12-LN-KIT)
$47.05
Drive in Trailer Hub Stud 9/16-18 x 2-5/16 7-132 Dexter 5200 6000 7000 Nuts (7132-KIT)
Drive in Trailer Hub Stud 9/16-18 x 2-5/16 7-132 Dexter 5200 6000 7000 Nuts (7132-KIT)
$3.41
U Bolt, 8K axle, 3/1/2 tube, 9/16-18 x 3.5 x 7.8 long with nuts (11-65-KIT)
U Bolt, 8K axle, 3/1/2 tube, 9/16-18 x 3.5 x 7.8 long with nuts (11-65-KIT)
$14.99
Lippert Hub 10K HD Post-2020 SHORT SPINDLE 4.77" Pilot LCI 2 Piece 10,000# Trailer Axle (791398)
Lippert Hub 10K HD Post-2020 SHORT SPINDLE 4.77" Pilot LCI 2 Piece 10,000# Trailer Axle (791398)
$218.99
005-071-00x4
Four 1.5" Dexter Tang Washers for 9k 10k GD Wheel Axle Trailer After 10/89 14GA (005-071-00x4)
$9.16