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Your search for "u-bolt nut" revealed the following:

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
10k GD Trailer Axle U-Bolt Kits 5/8" x 5" x 8-7/8" U Bolt with Nuts One Axle (11-77-KITX4)
10k GD Trailer Axle U-Bolt Kits 5/8" x 5" x 8-7/8" U Bolt with Nuts One Axle (11-77-KITX4)
$64.99
11-70-KIT
One Dexter U Bolt with Nuts for 12k 15k Round Trailer Axle 5 x 9-3/4 x 3/4 Dia (11-70-KIT)
$25.99
UBK-3500-R
4 - Standard 2-3/8" Round U-bolts 3500# Trailer Axle 5-1/2" w/Nuts 2-1/2" ID Kit Regular (UBK-3500-R)
$36.95 $40.50 Sale
U-Bolt Nut Kit, 1/2"-20 (Set of 8) – Fits 2000# Axles | UB-R200 / R201 / R301 / R302 (12N-LOTOF8)
U-Bolt Nut Kit, 1/2"-20 (Set of 8) – Fits 2000# Axles | UB-R200 / R201 / R301 / R302 (12N-LOTOF8)
$10.49
U Bolt, 8K axle, 3/1/2 tube, 9/16-18 x 3.5 x 7.8 long with nuts (11-65-KIT)
U Bolt, 8K axle, 3/1/2 tube, 9/16-18 x 3.5 x 7.8 long with nuts (11-65-KIT)
$14.99
(34143U) U-Bolt, Square, 2.125" x 6.50" x 1/2"-13, Fits 7000# / 2 x 3 Tube / UBN-8C / 32491 / 33513
(34143U) U-Bolt, Square, 2.125" x 6.50" x 1/2"-13, Fits 7000# / 2 x 3 Tube / UBN-8C / 32491 / 33513
$16.56
9K Axle U-Bolt Kit – 4" I.D. x 8.4" – 5/8"-11 Thread – Fits Dexter 9K & Lippert 10K (11-64-KIT)
9K Axle U-Bolt Kit – 4" I.D. x 8.4" – 5/8"-11 Thread – Fits Dexter 9K & Lippert 10K (11-64-KIT)
$24.99
2-1/8 x 5-3/8 Square U-bolt Trailer Axle Suspension 1/2" Diameter w/ Nuts (32443-KIT)
2-1/8 x 5-3/8 Square U-bolt Trailer Axle Suspension 1/2" Diameter w/ Nuts (32443-KIT)
$3.87
UBK-7000-R
U-Bolt Kit 7" Long 3" Wide U Bolts fits 5200-7000# Axle Beams (UBK-7000-R)
$32.15
UBK-2000-SQ-612
Square U-Bolt Kit for 7K Trailer Axles – 1/2"-13 – 7.25" Long – Fits 2" x 3" Tubes (UBK-2000-SQ-725)
$74.05
3" Wide Round U Bolt 6-1/2" Long 5200 6000 7000# Trailer Axle Axel Leaf Spring (UB-R301-KIT)
3" Wide Round U Bolt 6-1/2" Long 5200 6000 7000# Trailer Axle Axel Leaf Spring (UB-R301-KIT)
$7.46