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Your search for "castle nut" revealed the following:

1-Jun
1"-14 6-Slot Spindle Castle Nut for Dexter Alko Rockwell Trailer Axles (FA-SN100)
$6.44
ALKO Axle NUT, SPINDLE, 1-1/2"-12 UNF-2B 6 SLOT, Attaching hardware kit, fits AL-KO and Hayes Axle, 10K - 16K axles (006-239-00)
ALKO Axle NUT, SPINDLE, 1-1/2"-12 UNF-2B 6 SLOT, Attaching hardware kit, fits AL-KO and Hayes Axle, 10K - 16K axles (006-239-00)
$25.75
Lippert LCI Steel Locknut 1-3/4"-12 Thread Size Castle Nut Zinc Plated, For Rockwell 12K -16K axle (330037)
Lippert LCI Steel Locknut 1-3/4"-12 Thread Size Castle Nut Zinc Plated, For Rockwell 12K -16K axle (330037)
$21.69
7/8" Wet Equalizer Bolt with Castle Nut for Equalizers (GEB-78-KIT)
7/8" Wet Equalizer Bolt with Castle Nut for Equalizers (GEB-78-KIT)
$8.21
SEK-1
1" Trailer Spindle Nut and Round Washer Kit for Round Spindle End Cotter Castle (SEK-1)
$10.37
EQ-13-Kit
Equalizer for 2" Wide Slipper Springs 13" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-13-LN-KIT)
$37.88
2000# Brake Spindle Axle Shaft Trailer BT16 Hub Drum Axle Boat RV Camper Flanged (SP-150BT16FZ-KIT)
2000# Brake Spindle Axle Shaft Trailer BT16 Hub Drum Axle Boat RV Camper Flanged (SP-150BT16FZ-KIT)
$54.70
Dexter Spindle Nut, Tang & D Washer Kit (K71-335-00-RP)
Dexter Spindle Nut, Tang & D Washer Kit (K71-335-00-RP)
$9.99
SP-50642-SQ-KIT
#42 Square Spindle 5200 6000 7000 Pound Trailer Axle Hub Axel build your own (SP-50642-SQ-KIT)
$71.67
Equalizer for 2" Wide Slipper Springs 13" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-13-KIT)
Equalizer for 2" Wide Slipper Springs 13" Long 7/8" Center Hole W/ Nuts & Bolts (EQ-13-KIT)
$48.95
#42 Spindle, Torsion axle, with Spindle Hardware (SP-T60FBZ-KIT)
#42 Spindle, Torsion axle, with Spindle Hardware (SP-T60FBZ-KIT)
$82.35
SP-20084-KIT
3500# Trailer Axle Spindle R40484 Build new Repair axel hub 2" RV Camper #84 (SP-20084-KIT)
$42.95