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Your search for "castle nut" revealed the following:

6X Shackle Bolt w/zerk 9/16x3.40", 7/16-20 shoulder bolt- for 1/2" thick plates, double plates, or 2" Slipper Springs ZINC PLATED WITH NUT (007-236-05-LOTOF6)
6X Shackle Bolt w/zerk 9/16x3.40", 7/16-20 shoulder bolt- for 1/2" thick plates, double plates, or 2" Slipper Springs ZINC PLATED WITH NUT (007-236-05-LOTOF6)
$63.45
006-096-00
1 - ONE Dexter 10,000# Axle Spindle Nuts for 9K, 10K Trailer axle 6-96 (006-096-00)
$4.99
4X Brake Mounting Bolt for 8K & 9K Brakes, 1/2" - 20 Length: 1-3/4" Nuts Included (007-097-00X4)
4X Brake Mounting Bolt for 8K & 9K Brakes, 1/2" - 20 Length: 1-3/4" Nuts Included (007-097-00X4)
$13.24
34143-KIT
2-1/8" x 6-1/2" Square Trailer Axle U-Bolt Kit – 1/2" Diameter w/ Nuts (34143-KIT)
$16.84
Equalizer for 2" Wide Slipper Springs 11" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-11-LN-KIT)
Equalizer for 2" Wide Slipper Springs 11" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-11-LN-KIT)
$44.59
91635B-KIT
3.50" x 9/16" Shackle Bolt with Nut (91635B-KIT)
$7.84
FA-6-92Z
7/16"-20 Flange Nut, for Greaseable Trailer Spring Suspension Shoulder bolt (FA-6-92Z)
$4.99
10"x 2.2" Trailer Axle brake hub drum 3500# Axel 5x4.5" Camper ALKO Fits Dexter with Seal, Lug Nuts, Dust Cap Only (94545-SEAL)
10"x 2.2" Trailer Axle brake hub drum 3500# Axel 5x4.5" Camper ALKO Fits Dexter with Seal, Lug Nuts, Dust Cap Only (94545-SEAL)
$46.99
9/16"-18 Coned Lug Nut (6-053-LOTOF10)
9/16"-18 Coned Lug Nut (6-053-LOTOF10)
$3.39
NUT HEX SELF LOCKING 3/8-16 SLOTTED TOP - HYD BRAKE SHOE use with 5-107 (006-086-00)
NUT HEX SELF LOCKING 3/8-16 SLOTTED TOP - HYD BRAKE SHOE use with 5-107 (006-086-00)
$5.49
FA-7-187-KITX6
6 (SIX) KIT 3500# Trailer Axle Spring Shackle Grease Type Eye "wet" Bolt 9/16 x3 (FA-7-187-KITX6)
$18.64
1-3/4" Trailer Spindle Washer Nut Kit 10kHD 12k 15k Round Spindle Axle 1 WHEEL (SEK-3)
1-3/4" Trailer Spindle Washer Nut Kit 10kHD 12k 15k Round Spindle Axle 1 WHEEL (SEK-3)
$31.51