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These are only half the price of the hardware store, 8 heavy hex stainless steel nylon lock nuts, with these you can spend less time repairing and more time boating.
Do not use a high-speed power tool or impact tool to tighten the nut. You can get: 4 ubolts, 8 flat washers, 8 lock washers. Do not worry. If you have any questions, please feel free to send us an email via Amazon. We will solve it for you within 24 hours.


97"; rod diameter: 7mm / 028"; total length: 80mm / 3. 15"; thread length: 42mm / 1. 65". Suitable for boats, wood, and other home and industrial applications.



2mm / 1. 97"; thread length: 40mm / 3. 94" x 2. 53"l*w; groove width: 50mm / 1. 57"; perfectly suitable for Square Tube Size: 50 x 50mm / 1. 97". 2. Still perform well in rainy and humid seaside environment.

1. National Hardware
#ad
National Hardware N222-174 2190BC U Bolt in Zinc plated,#536-5/16"x2"x4-1/2"
#adNational Hardware #ad - Plate and nuts included. Designed for fastening products to pipe, wood, etc. Authorized replacement for Stanley Hardware Stock #N222-174. Manufactured from steel wire. Suitable for automotive, plumbing and other home and industrial applications.More information #ad
Brand | National Hardware #ad |
Manufacturer | KWIK9 #ad |
Height | 0.75 Inches |
Length | 4.5 Inches |
Weight | 0.22 Pounds |
Width | 3.24 Inches |
Part Number | N222-174 |
Model | N222-174 |
More information #ad
2. Hardware Essentials
#ad
Zinc, Hardware Essentials 320892 Square U-Bolt-5/16-18 x 3" x 2"
#adHardware Essentials #ad - Square u-bolts are great for attachment to square shaped posts. Item sold individually. Includes hex nuts and plate. U-bolt measurements are as follows: diameter-thread count x inside length x inside width.More information #ad
Brand | Hardware Essentials #ad |
Manufacturer | Hardware Essentials #ad |
Height | 2 Inches |
Length | 3.37 Inches |
Width | 4.43 Inches |
Part Number | 320892 |
Model | 320892 |
More information #ad
3. National Hardware
#ad
National Hardware N222-364 2192 Square U Bolts in Zinc, #535-5/16"x2"x5"
#adNational Hardware #ad - If plates are required use National's #2191 plates. Manufactured from steel wire. Designed for securing various products to rectangular wood and metal objects.More information #ad
If plates are required use National's #2191 plates. Nuts included. Manufactured from steel wire. Designed for securing various products to rectangular wood and metal objects.Brand | National Hardware #ad |
Manufacturer | KWIK9 #ad |
Height | 2 Inches |
Length | 10 Inches |
Weight | 0.22 Pounds |
Width | 5.8 Inches |
Part Number | N222-364 |
Model | N222-364 |
More information #ad
4. Foinwer
#ad
Or Sailboat Trailer, 4 Stainless Steel Square U-Bolt 1/2" D x 2 1/16" W x 4 3/4L" Boat Trailer Ubolts with Washers and Nuts,Replacement Parts and Accessories for Automobiles Trailer, Ski Boat
#adFoinwer #ad - Tips: it is recommended to use lubricant during installation to prevent wear. After-sales service: our u-bolts provide a one-year warranty service. 304 stainless steel material: u-bolts are made of 304 stainless steel, strong and durable, each bolt can withstand 100LBS.These are only half the price of the hardware store, 8 heavy hex stainless steel nylon lock nuts, with these you can spend less time repairing and more time boating.
More information #ad
Use a hand wrench or socket ratchet when installing the nut. U-bolt size: 1/2" d x 2-1/16" w x 4-3/4" l, suitable for 2" x 2" square beams and shafts, thread length: 2-1/2" inches, thread length, order Please check the measurement size carefully before. Do not use a high-speed power tool or impact tool to tighten the nut. You can get: 4 ubolts, 8 flat washers, 8 lock washers. Do not worry. If you have any questions, please feel free to send us an email via Amazon. We will solve it for you within 24 hours.
Brand | Foinwer #ad |
Manufacturer | Foinwer #ad |
Part Number | Foinwer |
More information #ad
5. National Hardware
#ad
National Hardware N222-125 2190 U Bolts in Zinc, #512-5/16"x1-3/8"x2-1/2"
#adNational Hardware #ad - Suitable for automotive, plumbing and other home and industrial applications. Manufactured from steel wire. Designed for fastening products to pipe, wood, etc.More information #ad
Designed for fastening products to pipe, wood, etc. Suitable for automotive, plumbing and other home and industrial applications. Plate and nuts included. Manufactured from steel wire.Brand | National Hardware #ad |
Manufacturer | KWIK9 #ad |
Height | 0.7 Inches |
Length | 2.5 Inches |
Weight | 0.15 Pounds |
Width | 2.25 Inches |
Part Number | N222-125 |
Model | N222-125 |
More information #ad
6. uxcell
#ad
Frame Plate, uxcell Square U-Bolts 2"50mm Inner Width Carbon Steel M8 with Nuts, Round Washers 4 Set
#aduxcell #ad - Hex nut: 14 x 6mm / 055" x 024"hex width*h; frame plate: 82 x 25 x 3mm / 2. 76" x 098" x 01"l*w*t. Thread dia. M8; fit square rod size: 50mm / 1.97"; rod diameter: 7mm / 028"; total length: 80mm / 3. 15"; thread length: 42mm / 1. 65". Suitable for boats, wood, and other home and industrial applications.
More information #ad
Application: used to fix or connect the locked parts to pipes, plumbing, etc. Material: carbon steel constructed with great performance in antirust and corrosion resistance. Round washers: 18 x 8 x 1mm / 071" x 031" x 004"od*id*t; package content: 4 x u-bolt, 8 x Nuts, 8 x Round Washers, 4 x Plates.Brand | uxcell #ad |
Manufacturer | uxcell #ad |
Part Number | a20090800ux0562 |
More information #ad
7. uxcell
#ad
Uxcell U-Bolts 2"50mm Inner Width 304 Stainless Steel M6 U-Bolt Fastener for 48mm Pipe Dia 5pcs
#aduxcell #ad - Thread lengthmin: 16mm / 063"; package content: 5pcs x U-Bolt. Fit for 48mm pipe diameter; pitch: 1mm/ 004"; rod dia: 5mm / 02";. Thread: m6; groove width: 50mm / 1. 97"; total length: 66mm / 2.More information #ad
6". Application: used to fix or connect the locked parts to pipes, plumbing, wood, etc. Material: 304 stainless steel constructed with great performance in antirust and corrosion resistance. Suitable for boats, and other home and industrial applications.Brand | uxcell #ad |
Manufacturer | uxcell #ad |
Height | 1.18 Inches |
Length | 5.51 Inches |
Width | 3.94 Inches |
Part Number | a18081500ux0539 |
More information #ad
8. Made in U.S.A.
#ad
4 Stainless Steel Square U-Bolts Boat Trailer 1/2" D x 2 1/16" W x 6 5/16" L
#adMade in U.S.A. #ad - Made in the U. S. A. Has 2-1/2" of Thread 2. 5". Contents exactly as pictured: this listing includes 4 U-Bolts, 8 flat washers & 8 Nylon Insert Lock Nuts. Material type: 304 stainless steel.More information #ad
Do not use impact or a high speed socket driver. U-bolt size: 1/2" d x 2 1/16" w x 6 5/16" L see picture. Use a hand wrench or socket ratchet when installing nuts. All hardware is also made of stainless steel.Brand | Made in U.S.A. #ad |
Manufacturer | Wiresmith LLC #ad |
Part Number | 26SSU-4pk |
More information #ad
9. Aopin
#ad
Aopin Square U-Bolts 2inch50mm Inner Width 304 Stainless Steel Silver M8 with Plates Nuts for Car/Motorhome/Sailing Trailer Replacement Part and Accessorie 1Pcs
#adAopin #ad - Application: square u-bolt used on fix or connect the locked parts to rectangular wood and metal objects, RVs, such as cars, sailboat trailers for fixed connections. Key paremeter: thread: m8; material: 304 stainless steel; color: silver; overall size: 100 x 64.2mm / 1. 97"; thread length: 40mm / 3. 94" x 2. 53"l*w; groove width: 50mm / 1. 57"; perfectly suitable for Square Tube Size: 50 x 50mm / 1. 97". 2. Still perform well in rainy and humid seaside environment.
More information #ad
Product features: strong and durable, no burrs, moisture resistance, acid resistance, smooth thread. Package content: 1 x u-bolt, 2 x nuts, 1 x plate, 2 x flat washers. Instructions: 1. Drill holes in the Connection. Lock nut and Flat Washer. 3. Choose the corresponding square U-shaped bolt according to the size of the pipe. Rust resistance, wear resistance, corrosion resistance.Brand | Aopin #ad |
Manufacturer | Aopin-Hardware #ad |
Height | 0.79 Inches |
Length | 2.76 Inches |
Width | 3.15 Inches |
Part Number | M8x50x100 |
More information #ad
10. National Hardware
#ad
National Hardware N222-463 2193BC U Bolt in Stainless Steel
#adNational Hardware #ad - Authorized replacement for Stanley Hardware Stock #N222-463. Excellent for marine and other outdoor applications. Suitable for automotive, plumbing and other home and industrial applications. Plate and nuts included. Designed for fastening products to pipe, wood, etc.More information #ad
Brand | National Hardware #ad |
Manufacturer | KWIK9 #ad |
Height | 1.5 Inches |
Length | 9 Inches |
Weight | 0.02 Pounds |
Width | 5 Inches |
Part Number | N222-463 |
Model | N222-463 |
More information #ad