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National Hardware U Bolt, #546-5/16" x 2-1/2" x 5", Steel, Zinc Plated

  • Based on 283 reviews
Condition: New
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Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon

Arrives Friday, Oct 23
Order within 20 hours and 15 minutes
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Size: 1 Count (Pack of 1)


Features

  • CONSTRUCTION: Heavy-duty steel wire construction with zinc plating provides superior corrosion resistance for u bolts designed to secure pipes, wood, and various materials in demanding automotive and industrial applications.
  • SPECIFICATIONS: 5/16 bolt diameter with 2-1/2 in x 5 in dimensions creates versatile fastening solution for automotive, plumbing, and industrial projects requiring reliable u-bolts and nuts set for secure connections.
  • COMPLETE SET: Includes matching plate and nuts with every 5/16 bolts purchase, eliminating need for separate hardware purchases and ensuring proper fit for secure installation every time you need dependable u bolt fasteners.
  • VERSATILITY: Multi-purpose design works perfectly for interior and exterior applications including automotive repairs, plumbing installations, and general construction projects requiring dependable u bolt fasteners and u-bolts solutions.
  • DURABILITY: Professional-grade steel wire manufacturing ensures long-lasting performance in harsh environments while zinc coating protects against rust and weathering for extended service life of these 5/16 bolts in all weather conditions.
  • QUALITY: National Hardware brand ensures over a century of manufacturing excellence with color-coded labeling system for easy identification, backed by proven innovation and superior product standards.
  • Manufactured from steel wire
  • Designed for fastening products to pipe, wood, etc
  • Suitable for automotive, plumbing and other home and industrial applications

Description

Whether for home, farm, builder or industrial customers, National has all the right hardware in the sizes and finishes you need. With over a century of service National is committed to maintaining the highest level of product quality, innovation and manufacturing technology. Providing latching and fastening options for all of your indoor and outdoor uses. Barrel, Dutch door, flush, mortise and surface bolts designed with ease of use and security in mind. Zinc plating offers corrosion resistance for all of your functional hardware needs. From the Manufacturer Whether for home, farm, builder or industrial customers, National has all the right hardware in the sizes and finishes you need. With over a century of service National is committed to maintaining the highest level of product quality, innovation and manufacturing technology. Providing latching and fastening options for all of your indoor and outdoor uses. Barrel, Dutch door, flush, mortise and surface bolts designed with ease of use and security in mind. Zinc plating offers corrosion resistance for all of your functional hardware needs.

Material: Stainless Steel


Thread Size: 5/16 Inch-18


Exterior Finish: Zinc


Manufacturer Grade: Grade Z1


Head Style: U-Bolt


Thread Size: 5/16 Inch-18


Exterior Finish: Zinc


Manufacturer Grade: Grade Z1


Screw Head Style: U-Bolt


Color: Zinc plated


Thread Type: Unc Or Unf


Thread Style: Right Hand


Item Hardness: Grade 2


Head Type: U-shaped


Screw Point Style: U-Bolt


Compatible Groove Diameter: 0.31 inches


Grade Rating: Grade 2


Set Screw Thread Type: Unc Or Unf


Material Type: Stainless Steel


Metal Type: zinc-coated steel


Finish Types: Zinc plated


Item Highlight: Clamps Around 2-1/2 in Pipe or Posts; Plate and Nuts Included, WeatherGuard Coating Resists Rust


Item Diameter: 0.31 inches


Size Name: 1 Count (Pack of 1)


Number of Pieces: 1


Fastener Size: 5/16" x 2-1/2" x 5"


Thread Coverage: Threaded on Both End


Item Dimensions: 12.3 x 4.3 x 5.9 inches


Item Weight: 0.27 g


Outside Diameter: 0.31 inches


Brand: National Hardware


UPC: 038613126169


Number of Packs: 1


Set Name: National Hardware N222-562 DP2190BC U Bolt Set (1 U Bolt, 1 Plate, 2 Nuts)


Global Trade Identification Number: 69


Unit Count: 1 Count


Manufacturer: National Hardware


Number Of Items: 1


Included Components: National Hardware N222-562 DP2190BC U Bolt Zinc plated, 5/16" x 2-1/2" x 5"


Item Type Name: Stanley National Hardware N222-562 DP2190BC U Bolt Zinc plated, 5/16" x 2-1/2" x 5"


Model: N222-562


Part Number: N222-315


Warranty Description: Warranty


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Zip Pay in 4
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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • 1 year still up there.
Size: 1 Count (Pack of 1)
Good quality still holds strong after a year of storms.
Reviewed in the United States on December 11, 2025 by Joshua Burleson

  • made the project right
Size: 1 Count (Pack of 1)
strong hardware, good support
Reviewed in the United States on September 20, 2025 by Jeannie Eaton

  • Missing nut
Size: 1 Count (Pack of 1)
Good quality though I wish they would spin the nuts on all the way when shipping. It was missing one when I got the 4 clamps I bought.
Reviewed in the United States on December 12, 2019 by Troy Becker

  • All good
Size: 1 Count (Pack of 1)
All good
Reviewed in the United States on October 19, 2025 by Ralph S.

  • Missing parts! Otherwise functional.
Size: 1 Count (Pack of 1)
One of the nuts was missing. Now I'll have to go to the hardware store to buy a replacement.
Reviewed in the United States on November 6, 2024 by Mac & Mar

  • These u-bolts have worked great.
Size: 1 Count (Pack of 1)
As long as the correct size is ordered these should work on all of you lighter needs. If you want heavy duty then up the diameter from 1/4" to 3/8" or even 1/2" like you see in automotive shackles.
Reviewed in the United States on May 18, 2024 by Paul G

  • Strong
Size: 1 Count (Pack of 1)
Why did you pick this product vs others?: Great size and price
Reviewed in the United States on July 14, 2025 by Pete Ravagni

  • It's a U bolt
Size: 1 Count (Pack of 1)
5/16" X 3 " U bolt with 2 nuts and metal plate as shown. Like every other U bolt I have ever bought.
Reviewed in the United States on July 28, 2025 by Mark Weisbach

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