which measurement is ID & which is leg length!!F????

2 1/2" is ID (inside of leg to inside of leg) & 3 1/2" from very top of arch to end of thread (linear measurement). Tip: because of optical illusion, sometimes you can place a piece of paper on monitor and mark vertical and horizontal points, the larger distance is the larger measurement. ; )

Would part 526 be 2” center on center?

No, 2" is the outside dimension of the U-bolt. You would think the inside dimension was more important!

which do I use for a 2 inch pole?

It's 2 inches between the threads. It's not on center of thread. So 2.25 in will fit two inch holes on center

description doesn't specify the inner diameter/center. which u bolt will fit around an 8inch fence post?

I bought the 4 1/2 in and my caliper shows it at 4 35/64, so just over 4.5in. If the diameter of your fence post is 8'', then order an 8'' ubolt and it should fit. What do you have behind that fence, a T-Rex?

National Hardware N222 174 2190bc U Bolt In Zinc Plated

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€ 13.71

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Fasten with Flair: Elevate Your Projects with Confidence!

BUILT TO LAST - Crafted from durable steel wire for both interior and exterior applications.
VERSATILE USE - Perfect for a variety of fastening needs, from DIY to professional projects.
EASY INSTALLATION - Includes plate and nuts for a hassle-free setup.
CORROSION RESISTANT - Zinc plating ensures longevity and resistance to the elements.
SECURE YOUR PROJECTS - Fastens products to pipe, wood, and more with confidence.

The National Hardware N222-174 U Bolt is a robust fastening solution, measuring 5/16" in diameter and 4-1/2" in length. Made from durable steel wire and zinc plated for corrosion resistance, it comes with a plate and nuts for easy installation, making it ideal for both interior and exterior applications.

Specifications

ASIN	B000BPRP8Y
Best Sellers Rank	#379,015 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #273 in U-Bolts
Brand	National Hardware
Color	Zinc Plated
Compatible Groove Diameter	0.31 inches
Customer Reviews	4.3 out of 5 stars 285 Reviews
Exterior Finish	Zinc
Fastener Size	5/16"x2"x4-1/2"
Fastener Type	U-Bolt
Finish Types	Zinc plated
Global Trade Identification Number	00038613126084
Head Style	U-Bolt
Head Type	U-Bolt
Included Components	U-bolt5/16x4-1/2"
Item Diameter	0.31 inches
Item Dimensions	10.2 x 5.9 x 2 inches
Item Hardness	Grade 8.8
Item Type Name	Stanley National Hardware N222-174 2190BC U Bolt Zinc plated, 5/16" x 2" x 4-1/2"
Item Weight	3.52 ounces
Manufacturer	National Hardware
Manufacturer Grade	No Obtainable (NO)
Material	Alloy Steel
Material Type	Alloy Steel
Maximum Shear Strength	The maximum shear strength for Alloy Steel is approximately 480 MPa (megapascals).
Metal Type	Alloy Steel
Model	N222-174
Number Of Items	1
Number of Packs	1
Number of Pieces	1
Outside Diameter	0.31 inches
Part Number	N222-174
Screw Head Style	U-Bolt
Screw Point Style	U
Size Name	#536-5/16"x2"x4-1/2"
Thread Class	3A
Thread Coverage	Partially Threaded
Thread Size	#0-80
Thread Style	Right Hand
Thread Type	Unc
UPC	038613126084
Unit Count	1 Count
Warranty Description	Warranty

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