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

BYOAK-5X45BT16-DNUFB-KITX2
Pair - Stub End Replace Idler Axle Kit 5x4.5 Hub 2000# BT16 Spindle (BYOAK-5X45BT16-DNUFB-KITX2)
$125.99 — Sold Out
36233U-KIT
UFP 3500 Pound Lubed Indexable Spindle with Bearings and Seal Kit Trailer Camper (36233U-KIT))
$186.54 — Sold Out
(sp-20084fz) Spindle 3500# Round #84 2" x 3.37" EZ Lube Flanged
$45.00 — Sold Out
10.25" Rotor for STRAIGHT SPINDLE with L68149 Bearings, Seal, & Cap (41020-KIT)
10.25" Rotor for STRAIGHT SPINDLE with L68149 Bearings, Seal, & Cap (41020-KIT)
$277.99 — Sold Out
Weld-On Trailer Axle Spindle 16,000 lb Capacity – Heavy Duty 7-Bolt Flange (66-16K)
Weld-On Trailer Axle Spindle 16,000 lb Capacity – Heavy Duty 7-Bolt Flange (66-16K)
$199.95 — Sold Out
Rockwell / Quality 10K Electric Brake Hub Drum Kit BLUE – #99 Spindle – 12.25" × 3.5" – 8-Lug (99865-1PAB-KIT)
Rockwell / Quality 10K Electric Brake Hub Drum Kit BLUE – #99 Spindle – 12.25" × 3.5" – 8-Lug (99865-1PAB-KIT)
$436.81 — Sold Out
05619U
2-Trailer Axle Spindle Seal Repair Sleeve Kit 2000# Axel 1.98 OD #5 Spindo 44649 (5619U)
$22.44 — Sold Out
Trailer Suspension U-Bolt Kit — 9/16" x 3" x 8" with Nuts & Washers (R91618)
Trailer Suspension U-Bolt Kit — 9/16" x 3" x 8" with Nuts & Washers (R91618)
$12.00 — Sold Out
TRP 7000# Round Spindle 2.45" Shaft Integrated Flange Butt Weld EZ-Lube (SP-HF-IFB-42L-225 )
TRP 7000# Round Spindle 2.45" Shaft Integrated Flange Butt Weld EZ-Lube (SP-HF-IFB-42L-225 )
$48.88 — Sold Out
8K Drop Spindle – 4" Drop – Lippert Style – EZ Lube (66-400F-NS)
8K Drop Spindle – 4" Drop – Lippert Style – EZ Lube (66-400F-NS)
$89.99 — Sold Out
Repair/Wear Sleeve, 3500# Trailer axle 1.715x 1.730 (060-009-00)
Repair/Wear Sleeve, 3500# Trailer axle 1.715x 1.730 (060-009-00)
$33.50 — Sold Out
Trailer Axle Bearing Kit – #42 Spindle (1.25"/1.50") – Fits 5,200-7,000 lb Axles – Includes Bearings, Races, Seal, & Dust Cap (BK-AG)
Trailer Axle Bearing Kit – #42 Spindle (1.25"/1.50") – Fits 5,200-7,000 lb Axles – Includes Bearings, Races, Seal, & Dust Cap (BK-AG)
$21.50 — Sold Out