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Your search for "castle nut" revealed the following:

UBK-7000-R-916
Round U-Bolt 3" x 7-1/4" Thread Size 9/16" Lock Nuts w/ Tie Plates Trailer Axle (UBK-7000-R-916)
$29.99
6x Drive in Trailer Hub Stud 9/16-18 x 2-5/16 7-132 Dexter 5200 6000 7000 Nuts (71326-KIT)
6x Drive in Trailer Hub Stud 9/16-18 x 2-5/16 7-132 Dexter 5200 6000 7000 Nuts (71326-KIT)
$22.01
Spindle Washer Hex Nut End Kit for 12k & 15k Trailer Axles(K71-341-00)
Spindle Washer Hex Nut End Kit for 12k & 15k Trailer Axles(K71-341-00)
$40.88
(24) Trailer Axle Leaf Spring Shackle Bolt Grease Wet Bolt 9/16 x 3-3/8" w/Nut (007-236-01-LOTOF24)
(24) Trailer Axle Leaf Spring Shackle Bolt Grease Wet Bolt 9/16 x 3-3/8" w/Nut (007-236-01-LOTOF24)
$213.26
2- 5x4.5 Idler Hubs with 2000# Bearing Kits Replace Snow Mobile Trailer Axle (RVIBT5450-KITX2)
2- 5x4.5 Idler Hubs with 2000# Bearing Kits Replace Snow Mobile Trailer Axle (RVIBT5450-KITX2)
$81.92
Trailer Lug Nut, 9/16"-18 Thread, Conical Seat, Trailer Wheel Applications (6-053)
Trailer Lug Nut, 9/16"-18 Thread, Conical Seat, Trailer Wheel Applications (6-053)
$0.88
1/2" Hex Wheel Lug Nuts – Set of 5 – 60° Coned Seat, 1/2"-20 x 13/16" (X1023R-LOTOF5)
1/2" Hex Wheel Lug Nuts – Set of 5 – 60° Coned Seat, 1/2"-20 x 13/16" (X1023R-LOTOF5)
$1.09
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
7IN5BD-KIT2X
TWO 7" Electric 5 x 4.5 Brake Drum 2000# Rated for Trailers New Bearings Hub Lug (7IN5BD-KIT2X)
$99.60
33667U-L Idler Hub with Lug Nuts – 3,500 lb – 5 on 4.5 – 1/2" Stud – 68149 / 32373 (SKU: 33667U-L)
33667U-L Idler Hub with Lug Nuts – 3,500 lb – 5 on 4.5 – 1/2" Stud – 68149 / 32373 (SKU: 33667U-L)
$124.99
WASHER TANG 1 1/2 14 GA10KGD goes with 006-096-00 Nuts (005-071-00)
WASHER TANG 1 1/2 14 GA10KGD goes with 006-096-00 Nuts (005-071-00)
$5.99
Locknut, 1/2-13, for 10K 12K Caliper for Disc Brakes Fits Bolt 7-186 (006-125-00)
Locknut, 1/2-13, for 10K 12K Caliper for Disc Brakes Fits Bolt 7-186 (006-125-00)
$6.99