What is the thread size so that I can order extra nuts?

5/16-18 (course). Fine thread would be 5/16-24. Checked with a thread gage and confirmed 5/16-18

Is there a link for a u bolt to fit a 1-3/4" od pipe, and long enough to go through 4x4 lumber and allowing for bolts and a little xtra room?

No, I've used it supporting cat5 to at giant tent in a industrial setting on 2'' conduit

What would be the one for a 6" pvc pipe?

I purchased a 2” for a 2”pipe and it fit perfectly. I assume you would therefor need a 6”

Can you please send a direct link for the u bolt that will fit around the 4”pvc pipe ?

https://www.amazon.com/National-Hardware-N222-174-2190BC-plated/dp/B000BPRP8Y/ref=psdc_16409751_t2_B000BPK8F6

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Stanley National Hardware 2193BC #546-5/16"x2-1/2 x5 U Bolt w/Plate & Hex Nuts in Stainless Steel

Product ID: 251199692

Details

Exterior Finish
Stainless
Head Style
Cup
Manufacturer Grade
Grade 8
Material
Alloy Steel
Thread Size
5/16"-18

🔩5/16" diameter for versatile fastening

⚙️Includes plate & hex nuts for easy install

🛡️300 series stainless steel resists corrosion

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Description

🔧 Secure your projects with stainless steel confidence!

COMPACT READY WHEN YOU ARE - Lightweight and easy to store (0.02 lbs), this U bolt is your go-to hardware for quick, reliable fastening anytime, anywhere.
ALL IN ONE FASTENING SOLUTION - Comes complete with a matching plate and hex nuts, eliminating the hassle of sourcing extra parts and speeding up your installation process.
PRECISION FIT FOR EVERY PROJECT - 5/16" diameter with 2-1/2" width and 5" length offers a secure grip on pipes, wood, and structural materials without bulk, ideal for automotive, plumbing, and industrial use.
TRUSTED LEGACY MODERN RELIABILITY - From a century-old brand known for quality, this U bolt delivers consistent performance that professionals and DIYers rely on.
BUILT TO LAST ENGINEERED TO PERFORM - Crafted from premium 300 series stainless steel with 18% chromium for unbeatable rust and corrosion resistance—perfect for demanding outdoor and marine environments.

The Stanley National Hardware 2193BC U Bolt is a 5/16" diameter, 2-1/2" wide, 5" long fastening solution made from durable 300 series stainless steel with 18% chromium for superior corrosion resistance. Designed for versatile use in automotive, plumbing, and industrial applications, it includes a plate and hex nuts for easy installation. Lightweight and compact, this U bolt offers reliable, rust-resistant performance backed by a trusted brand legacy.

Specifications

ASIN	B000BPK8F6
Brand	National Hardware
Colour	Satin Nickel
Compatible Groove Diameter	0.31 Inches
Country Of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (304)
Exterior Finish	Stainless Steel
Fastener Size	5/16"x2-1/2"x5
Fastener Type	U-Bolt
Finish Types	Stainless Steel
Global Trade Identification Number	00038613191440
Grade Rating	Grade 2
Head Type	Button
Included Components	National Hardware N222-471 2193BC U Bolt in Stainless Steel
Item Diameter	0.31 Inches
Item Dimensions	14.2 x 10.2 x 2.5 Centimeters
Item Hardness	Grade 5
Item Type Name	National Hardware N222-471 2193BC U Bolt in Stainless Steel
Item Weight	0.02 Pounds
Manufacturer	KWIK9
Manufacturer Grade	Grade 8
Material Type	Alloy Steel
Maximum Shear Strength	50-60 ksi (345-414 MPa)
Metal Type	Stainless Steel
Model	N222-471
Number Of Items	1
Number of Packs	1
Number of Pieces	1
Outside Diameter	0.31 Inches
Part Number	N222-471
Screw Head Style	Cup
Screw Point Style	U
Set Name	National Hardware Stainless Steel U-Bolt Set (1 Bolt, Plate, 2 Nuts)
Size Name	#546-5/16"x2-1/2"x5"
Thread Class	1A
Thread Coverage	Fully Threaded
Thread Size	5/16"-18
Thread Style	Right Hand
Thread Type	UNC
UPC	038613191440
Unit Count	1.0 Count

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€ 45.75

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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