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

BK3-100
Complete Trailer Bearing Kit for 6000# Axles #42 Spindle 15123 / 22580 Bearings (BK3-100)
$28.30 $36.91 Sale
Add Brakes Basic Kit for 3500# Axles 5 x 5 Bolt Pattern Drum, 10" Backing Plates (94550-B-IMP)
Add Brakes Basic Kit for 3500# Axles 5 x 5 Bolt Pattern Drum, 10" Backing Plates (94550-B-IMP)
$224.71
1X 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-KIT)
1X 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-KIT)
$8.19
Round U-Bolt 3" Length 7-1/4" Thread Size 1/2" Lock Nuts Trailer Axle (UB-R302-KIT)
Round U-Bolt 3" Length 7-1/4" Thread Size 1/2" Lock Nuts Trailer Axle (UB-R302-KIT)
$10.35
UFP SS 1.68" OD Spindle Wear Ring Sleeve DB35-42 3500 Boat Trailer + O Ring (33522+32736)
UFP SS 1.68" OD Spindle Wear Ring Sleeve DB35-42 3500 Boat Trailer + O Ring (33522+32736)
$4.58
UB-R303-KIT
Round U-Bolt Width 3" Length 7-1/4" Thread Size 9/16" Lock Nuts Trailer Axle (UB-R303-KIT)
$10.49
Add Brakes – Manual Adjust • 7,000 lb Trailer Axle Kit 12" x 2" Electric Brakes • 8 x 6.5" Hub/Drums • 1/2" Studs (92865-B-IMP-F-KIT)
Add Brakes – Manual Adjust • 7,000 lb Trailer Axle Kit 12" x 2" Electric Brakes • 8 x 6.5" Hub/Drums • 1/2" Studs (92865-B-IMP-F-KIT)
$369.95
Wet Bolt, Hex Head, 0.56" x 3", 7/16" Step Down End (0.44"), FA-6-92Z Nut / GREASEABLE (FA-7-187-KIT)
Wet Bolt, Hex Head, 0.56" x 3", 7/16" Step Down End (0.44"), FA-6-92Z Nut / GREASEABLE (FA-7-187-KIT)
$10.45
92865-B-IMP-916
Add Brakes & Hub/Drum Kit – 7,000 lb Trailer Axle – 12" x 2" Self-Adjusting Electric Brakes – 8 on 6.5" – 9/16"-18 Studs (92865-B-FSA-IMP-916)
$364.95 $391.42 Sale
WASHER TONGUE 1 1/2 .134 10KGD (005-070-00)
WASHER TONGUE 1 1/2 .134 10KGD (005-070-00)
$1.58
TD17293
Seal Wear Sleeve Stainless Tie Down Axle Trailer bearing grease 1.72" OD (TD17293)
$14.38
MAT 3,500K Trailer Wheel Bearing Kit – Fits 3,500 lb Axles -1.063" x 1.378" Spindle (BEK-3.5K)
MAT 3,500K Trailer Wheel Bearing Kit – Fits 3,500 lb Axles -1.063" x 1.378" Spindle (BEK-3.5K)
$19.95