16 Sets M8 Square U-Bolts 1 in Wide M8 x 25mm x 70mm - Durable 304

In this review of the 16 Sets M8 Square U-Bolts the bottom line is simple: this is a practical kit for DIYers and small workshop needs that want a full range of mounting hardware for pipes, trailers, or frames. The reviewer found the complete set - 16 square U-bolts with plates, washers, nuts and a wrench - saves time hunting components separately and delivers reliable corrosion resistance because the parts are made from 304 stainless steel. Confirm the 25mm (1 in) inside width for your application before buying.

Key Features

• M8 diameter: The M8 thread means common nuts and tools work easily for fast installation and replacement.
• 1 in I.D. width: The 25mm inside width is suitable for many small pipes, fenders and rails where a square U-bolt is needed to clamp securely.
• 304 stainless construction: The stainless material offers good resistance to rust and moisture for outdoor and marine-adjacent use.
• Complete hardware set: Each kit includes 16 U-bolts, 16 plates, 32 flat washers, 32 lock washers, 32 nuts and a wrench so projects can proceed without sourcing extras.
• Practical length: The 70mm O.D. length provides clearance for thick mounts or additional washers when securing to frames and wood.

Who It's For

This kit is best for homeowners, mechanics and small-fabrication shops that need multiple matched U-bolts for mounting fenders, pipes, trailer parts or frame attachments. The included plates and hardware reduce assembly time for batches of similar fastenings.

Those who need metric sizes other than M8 or a different inside diameter should look elsewhere; also, if you require hardened or specialty-coated bolts for heavy structural loads, a purpose-made high-tensile fastener would be more appropriate than this stainless general-purpose kit.

Pros & Cons

Pros

• Complete set covers replacements and multiple mounts without extra purchases.
• 304 stainless steel gives good corrosion and moisture resistance for outdoor use.
• Standard M8 thread and included wrench make installation straightforward for most users.

Cons

• Size accuracy and long-term durability received mixed reports, so buyers should confirm fit and avoid high-speed impact tools during installation to protect threads.

Specifications

Quantity	16 sets (U-bolt, plate, multiple washers and nuts)
Thread size	M8
Inside width	25mm (1 in)
Outside length	70mm (2.7 in)
Material	304 stainless steel
Included tools	1 wrench

Our Verdict

The 16-set M8 square U-bolt kit is a sensible value for anyone needing multiple matching clamps for light- to medium-duty work. It combines the convenience of a full hardware kit with the corrosion resistance of 304 stainless steel, making it a practical buy for general maintenance, trailer fender work and small fabrication tasks where the 25mm inside width matches the part being clamped.

Frequently Asked Questions

Are the U-bolts fully stainless?
Yes, the U-bolts are made of 304 stainless steel, which resists rust and moisture in most non-chemical environments.

Will these fit a 1 in pipe?
They are sized at 25mm (1 in) inside width; verify your part's outside diameter matches that ID before ordering.

Can I use power tools to tighten the nuts?
It is recommended to use a manual or low-speed wrench and apply oil when installing; avoid high-speed impact tools to prevent thread damage.