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Your search for "castle nut" revealed the following:

SP-125BT8-KIT
2000# Spindle Axle Shaft Repair Trailer BT8 1.25" Hub Drum Axel Boat RV Camper (SP-125BT8-KIT)
$35.53
5 x 4.5 Replacement Idler Hub Spindle Kit w/BRAKE FLG Trailer Axle 3500# 84 (STUB-84FZ-545-H)
5 x 4.5 Replacement Idler Hub Spindle Kit w/BRAKE FLG Trailer Axle 3500# 84 (STUB-84FZ-545-H)
$73.99
STUB-84-555-H
5 x 5.5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-555-H)
$66.09
6 x 5.5 Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-655-H)
6 x 5.5 Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-655-H)
$72.98
3500 lb Stub Axle End Kit – 5 on 4.75 Bolt Pattern – Complete Hub & Spindle Assembly (STUB-84-5475-H)
3500 lb Stub Axle End Kit – 5 on 4.75 Bolt Pattern – Complete Hub & Spindle Assembly (STUB-84-5475-H)
$73.86
Replacement Spindle Tang Washer — 4 Pack (5-101-L4)
Replacement Spindle Tang Washer — 4 Pack (5-101-L4)
$2.44
STUB-84-550-H
5 x 5" Replacement Idler Hub Spindle Kit Stub End unit Trailer Axle 3500# #84 (STUB-84-550-H)
$55.99
9/16"Lock Nut for Shackle Bolt (SB-LN-9)
9/16"Lock Nut for Shackle Bolt (SB-LN-9)
$6.49
Stub Axle End Kit – 3,500 lb – 5 on 4.5 Bolt Pattern – With Brake Flange (STUB-84-545-H)
Stub Axle End Kit – 3,500 lb – 5 on 4.5 Bolt Pattern – With Brake Flange (STUB-84-545-H)
$59.99
BYOAK-42-H865-SQ
7000# Build Your Own Axle Kit w/ 8 x 6.5 Lug Idler Hubs and #42 Square Spindle (BYOAK-42-H865-SQ)
$285.18
Weld-on 2.375" E-Z Lube Round Spindle W/ Brake Flange Trailer Axle #84 3,500-LB (66-84LZ-KIT)
Weld-on 2.375" E-Z Lube Round Spindle W/ Brake Flange Trailer Axle #84 3,500-LB (66-84LZ-KIT)
$25.77
Lock Nut, 3/4"-10 (006-113-00)
Lock Nut, 3/4"-10 (006-113-00)
$4.99 $7.50 Sale