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4Pack Square U-Bolt 1/2'-13 Thread Size, 304 Stainless Steel U Bolts 1/2' D x 3-1/16' W x 4-5/16' L with Washers & Nuts, for Replacement Parts and Accessories for Ski Boat, Fishing Boat

4.7 (8) Write Review
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$27.79

$ 14 .99 $14.99

In Stock

About this item

  • 【 U-BOLT SIZE 】-- 1/2" D x 3-1/16" W x 7-5/16'' L, thread length: 3 inch, suitable for 3" x 3" square beams and shafts. (Please check your measurements and match them up with the measurements shown in the picture for a perfect fit.)
  • 【 WARNING & STOP 】-- Do not use an impact or powered socket driver when installing, only use a hand socket ratchet or wrench to run the nuts up and tighten. Ignoring this instruction will cause U-Bolt galling, seizing, and breaking.
  • 【 HIGH QUALITY 】-- This Stainless Steel Trailer Round U-Bolt is the ultimate in rust prevention. It is made from grade 304 stainless steel for corrosion resistance and durability.
  • 【 WIDELY USED 】-- These Square U-bolt used to hold on various brackets and upright guides on boat and utility trailers. Includes 8 x Stainless Steel Hex nuts, 8 x lock washers, and 8 x flat washers.
  • 【 ATTENTION 】-- When measuring for Your needed Height (Length), add 1" for the nut and washer. Please feel free to us if you have any problems. We will solve it for you within 24 hours.


Product Description

boat trailer u bolt kit
trailer u bolts
square u bolts
u-bolts 2.5 inch wide
galvanized u bolts for boat trailers
Type Square U-Bolt
Material 304 Stainless Steel, Stainless Steel
Material Grade/Class 304
Finish Plain
System of Measurement Inch
Thread Size 1/2"-13
Thread length 2 1/2''
Inside Width 3 1/16''
Inside Length 4 5/16''
Dimensional Standards ASME B18.31.5
Thread Type Coarse

FITHOIST Stainless Stee Square U-Bolts are an excellent value and provide good corrosion resistance.

  • Designed for securing various products to rectangular wood and metal objects.
  • 304 stainless steel U-bolts have excellent corrosion resistance and good chemical resistance.
  • U Bolts from FITHOIST are ideal for trailer axles, leaf springs, bunk brackets, guide poles, and any other option for mounting.
  • Not designed for mounting axles.

We carry these stainless steel U Bolts every size option, allowing you to replace your rusted U Bolts with ones that will last a lifetime.

Package List：

  • 4 x Stainless Steel Square U-Bolt
  • 8 x Stainless Steel Hex Nuts
  • 8 x Lock Washers
  • 8 x Flat Washers

Flyfishinglife
2025-07-21 16:04:27
Great value for the price on these stainless U bolts. I used them on my boat lift in saltwater. Real heavy duty and no more rusted U bolts.
Tomas
2025-07-05 13:42:16
solid hardware, good price.
MD
2025-06-09 20:00:05
These fit perfect but I had to make my own plates to go with them. Otherwise I would have gave them 5 stars.
HILSTON
2025-05-04 17:43:11
THESE THINGS ARFE GREAT PRICE IS PERFECT FOR WHAT YOU GET. BEEN ON MY BOAT FOR 7 MONTHS SALTWATER. NOT A BIT OF RUST OR CORROSION. PERFECT FOR TANDOM AXLE REPLACMENTS
William H. Felder
2025-04-29 13:38:28
Great value for the price.
J Whitehead
2025-04-25 10:06:51
The media could not be loaded.
K C.
2025-04-06 11:55:09
I used this to mount a bull bar to a front tow hitch mount on my truck.I could only have a winch mount or a bull bar on the front of my truck as they used the same mounting points for the brackets.Did the math bought these & drilled some holes into the bull bar than bolted them on the hitch frame. It looks & fits perfect with these U bolts its 100% more solid than the original brackets.
Mr.Rita
2024-11-28 17:36:09
used these on my hot rod and they worked great.