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

6 x 5.5" Replacement Idler Hub SQUARE Stub End Trailer Axle 3500# #84 (STUB-84-655-H-SQ)
6 x 5.5" Replacement Idler Hub SQUARE Stub End Trailer Axle 3500# #84 (STUB-84-655-H-SQ)
$95.75
Build Your Own Axle Kit 3500# Round Spindles, 6 x 5.5 Hub (BYOAK-84-H655-R)
Build Your Own Axle Kit 3500# Round Spindles, 6 x 5.5 Hub (BYOAK-84-H655-R)
$249.99
7K #42 Round EZ-Lube Trailer Spindle Kit (SP-25042FZ-225-DD-KIT)
7K #42 Round EZ-Lube Trailer Spindle Kit (SP-25042FZ-225-DD-KIT)
$70.45
Two (2) 5x4.75 Replacement Idler Hub Spindle Kit Stub End Trailer Axle 3500# #84 (STUB-84-5475-H-X2)
Two (2) 5x4.75 Replacement Idler Hub Spindle Kit Stub End Trailer Axle 3500# #84 (STUB-84-5475-H-X2)
$150.00
Copy of 10K Lippert Bearing kit with Spindle End Hardware (BK4-287-LIPPERT)
Copy of 10K Lippert Bearing kit with Spindle End Hardware (BK4-287-LIPPERT)
$46.34
EIGHT 5/8" -18 Flange Wheel Lug Nut (10K 8K 12K) 006-058-00 Trailer Axle hub (006-058-00-LOTOF8)
EIGHT 5/8" -18 Flange Wheel Lug Nut (10K 8K 12K) 006-058-00 Trailer Axle hub (006-058-00-LOTOF8)
$31.62
Build Your Own 3500 Electric Brake Trailer Axle Kit w/EZ Lube Spinde 5x4.75 Drum (BYOAK-84-D5475-2.0R)
Build Your Own 3500 Electric Brake Trailer Axle Kit w/EZ Lube Spinde 5x4.75 Drum (BYOAK-84-D5475-2.0R)
$299.99
Seal Oil 2.75" x 3.779" Fits #99 ALKO / Hayes (91030)
Seal Oil 2.75" x 3.779" Fits #99 ALKO / Hayes (91030)
$28.63
2 x 5 x 5.5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-555-Hx2)
2 x 5 x 5.5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-555-Hx2)
$149.61
10,000 lb General Duty Axle Spindle — Fits Dexter 10K Axles (TAD10KGD)
10,000 lb General Duty Axle Spindle — Fits Dexter 10K Axles (TAD10KGD)
$529.45
10K Lippert Bearing kit with Spindle End Hardware and Oil Cap (BK4-287-LIPPERT+183772CAP)
10K Lippert Bearing kit with Spindle End Hardware and Oil Cap (BK4-287-LIPPERT+183772CAP)
$57.22
TAD12K · 12,000 lb Heavy-Duty Axle Spindle — Fits Dexter 12K Axles (TAD12K)
TAD12K · 12,000 lb Heavy-Duty Axle Spindle — Fits Dexter 12K Axles (TAD12K)
$539.95