Is the 1 3/8” an inside or outside measure for the width for u bolt N222-448?

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National Hardware N222-448 2193BC U Bolt in Stainless Steel

National Hardware N222-448 2193BC U Bolt in Stainless Steel

Product ID: 129774503

Details

Exterior Finish
Zinc
Head Style
Cupped
Manufacturer Grade
Grade 8
Material
Alloy Steel
Thread Size
1/2"-13

🌊300 Series Stainless Steel Corrosion Resistance

📏Fits 4.5-inch Groove Diameter

🔩Grade 8 Alloy Steel Strength

$17.75

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Description

🔧 Lock in strength and style with the ultimate corrosion-proof U-bolt!

PRECISION FIT - Designed to securely fasten pipes, wood, and more with a perfect fit for 4.5-inch groove diameters.
TRUSTED LEGACY - Backed by National Hardware’s century-long commitment to quality, innovation, and manufacturing excellence.
WEATHERPROOF WONDER - 300 series stainless steel with 18% chromium ensures zero rust or corrosion—even in marine or outdoor environments.
UNMATCHED DURABILITY - Crafted from Grade 8 alloy steel for superior shear strength (~275 MPa) that stands up to industrial demands.
COMPLETE FASTENING KIT - Includes plate and nuts for hassle-free installation—everything you need in one package.

The National Hardware N222-448 2193BC U Bolt is a premium-grade, fully threaded fastening solution made from 300 series stainless steel alloy with 18% chromium, delivering exceptional corrosion resistance and industrial-grade shear strength (~275 MPa). Perfect for automotive, plumbing, marine, and outdoor applications, it fits 4.5-inch groove diameters and comes complete with plate and nuts for easy installation. Trusted by professionals for over a century, this U-bolt combines durability, precision, and weatherproof reliability.

Specifications

ASIN	B000BQ7ZYC
Best Sellers Rank	#160,868 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #137 in U-Bolts
Brand	National Hardware
Color	Stainless Steel
Compatible Groove Diameter	4.5 inches
Customer Reviews	4.4 4.4 out of 5 stars (221)
Exterior Finish	Zinc
Fastener Type	U-Bolt
Finish Types	Stainless Steel
Global Trade Identification Number	00038613191419
Grade Rating	Grade 2
Head Type	Flange
Included Components	BOLT U 5/16"X1.38X2.5 SS
Item Dimensions	4.46 x 3.23 x 1.68 inches
Item Hardness	Grade 2
Item Type Name	Stanley National Hardware N222-448 2193BC U Bolt in Stainless Steel, 5/16" x 1-3/8" x 2-1/2"
Item Weight	8.53 g
Manufacturer	National Hardware
Manufacturer Grade	Grade 8
Material Type	Alloy Steel
Maximum Shear Strength	Approximately 275 MPa
Metal Type	Stainless Steel
Model	N222-448
Number Of Items	1
Number of Packs	1
Number of Pieces	1
Part Number	222448
Screw Head Style	Cupped
Set Screw Thread Type	UNC or UNF
Size Name	#512-5/16"x1-3/8"x2-1/2"
Thread Coverage	Fully Threaded
Thread Size	1/2"-13
Thread Style	Left Hand
Thread Type	Unc
UPC	038613191419
Unit Count	1 Count
Warranty Description	Warranty

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