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

SP-22542-KIT
Round Spindle #42 2.25" x 6" 7000# fits Dexter ALKO Axis Trailer Axel Axle Shaft (SP-22542-KIT)
$50.44 $65.73 Sale
Lock Nut, 3/4"-10 (006-113-00)
Lock Nut, 3/4"-10 (006-113-00)
$4.99 $7.50 Sale
1X Spindle 3500# Round #84 2 x 3.37 (SP-20084)
1X Spindle 3500# Round #84 2 x 3.37 (SP-20084)
$29.99
Trailer Spindle #84 — Machined for Brake Flange Welding (SP-20084M)
Trailer Spindle #84 — Machined for Brake Flange Welding (SP-20084M)
$29.99
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
UFP Spindle End Hardware Kit – DW-813 / SN-813 / LS-813 Components (SN813K)
UFP Spindle End Hardware Kit – DW-813 / SN-813 / LS-813 Components (SN813K)
$6.75
5" Lug x 4.5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# with Square Spindle (STUB-84-545-HSQ)
5" Lug x 4.5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# with Square Spindle (STUB-84-545-HSQ)
$91.27
Pair · 2000 lb Brake Spindles with Flange – Fits L44649 Bearings (SP-150BT16FZ-2)
Pair · 2000 lb Brake Spindles with Flange – Fits L44649 Bearings (SP-150BT16FZ-2)
$87.97
4200# 5 x 4.5 UFP L68149 Straight Spindle Hub Trailer Axle Load Rite Boat 1.375" (33667U-KIT)
4200# 5 x 4.5 UFP L68149 Straight Spindle Hub Trailer Axle Load Rite Boat 1.375" (33667U-KIT)
$142.86
Trailer Axle Spindle #42 6000# 7000# W/ Brake flange EZ Lube hub Stub shaft Axel (SP-25042FZ-KIT)
Trailer Axle Spindle #42 6000# 7000# W/ Brake flange EZ Lube hub Stub shaft Axel (SP-25042FZ-KIT)
$93.19
7000# Round Spindle #42 2.25 x 6 (SP-22542)
7000# Round Spindle #42 2.25 x 6 (SP-22542)
$42.99
Pair of 5x5.5 Hubs with Flanged #84 Spindles 3500# fits Trailer Axle (STUB-84FZ-555-H-X2)
Pair of 5x5.5 Hubs with Flanged #84 Spindles 3500# fits Trailer Axle (STUB-84FZ-555-H-X2)
$120.91