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Your search for "castle nut" revealed the following:

11-70-KIT
One Dexter U Bolt with Nuts for 12k 15k Round Trailer Axle 5 x 9-3/4 x 3/4 Dia (11-70-KIT)
$25.99
Spindle End Kit 9k-10k General Duty Trailer Axle After 10/89 (WK-10K)
Spindle End Kit 9k-10k General Duty Trailer Axle After 10/89 (WK-10K)
$17.74
FOUR Trailer Leaf Spring Shackle Bolts 9/16" -18 X 3 Long with Lock Nuts (9163B-KITX4)
FOUR Trailer Leaf Spring Shackle Bolts 9/16" -18 X 3 Long with Lock Nuts (9163B-KITX4)
$19.99
FA-7-187-KITX14
12-KIT - 3500# Trailer Axle Spring Shackle Grease Type Eye "wet" Bolt 9/16 x 3 (FA-7-187-KITX12)
$32.13
Set of 8 9/16"-18 Coned Lug Nut (6-053-LOTOF8)
Set of 8 9/16"-18 Coned Lug Nut (6-053-LOTOF8)
$2.69
6 Pack 3" Standard Shackle Bolts with Locknuts fits Dexter Trailer Axle (9163B-KITX6)
6 Pack 3" Standard Shackle Bolts with Locknuts fits Dexter Trailer Axle (9163B-KITX6)
$13.47
Trailer Lug Nut, 1/2"-20 Thread, 13/16" Hex, 60° Conical Seat (X1023R)
Trailer Lug Nut, 1/2"-20 Thread, 13/16" Hex, 60° Conical Seat (X1023R)
$0.65
8x Drive-In Trailer Hub Studs w/ Nuts – 9/16-18 x 2-5/16 – Fits 5200–7000 lb Dexter Axles (71328-KIT)
8x Drive-In Trailer Hub Studs w/ Nuts – 9/16-18 x 2-5/16 – Fits 5200–7000 lb Dexter Axles (71328-KIT)
$46.01
1/2" Hex Wheel Lug Nuts – Set of 6 – 60° Coned Seat, 1/2"-20 x 13/16" (X1023R-LOTOF6)
1/2" Hex Wheel Lug Nuts – Set of 6 – 60° Coned Seat, 1/2"-20 x 13/16" (X1023R-LOTOF6)
$1.29
Dexter Single-Axle Trailer Hanger Kit for 2" Slipper Springs - 5" Front, 6-3/8" Rear (HAP-105-00)
Dexter Single-Axle Trailer Hanger Kit for 2" Slipper Springs - 5" Front, 6-3/8" Rear (HAP-105-00)
$109.96
9k-10k GD 1-1/2" Spindle End Kit of Tongue, Tang, and 2 Hex Nuts (K71-367-00-RP)
9k-10k GD 1-1/2" Spindle End Kit of Tongue, Tang, and 2 Hex Nuts (K71-367-00-RP)
$25.05
8-Pack Drive-In Hub Stud Kit — 9/16"-18 x 2-5/16" Includes 8 Matching Lug Nuts (K71-748-00-N)
8-Pack Drive-In Hub Stud Kit — 9/16"-18 x 2-5/16" Includes 8 Matching Lug Nuts (K71-748-00-N)
$44.85