What is the outer diameter of these shaft collars? Didn't see in the specs but may have missed.

Hello. The outside diameter is 1-1/8” Best Regards Victoria Summit Collars

what size s the set screws? thank you

The ones I received are 3/32". That's way way smaller than 4mm, 2.38 mm to be exact. I did not have that size, but do now.

3/8" fit for 9mm pipe?

3/8" equals 9.52 mm so if your pipe is 9 mm the collar will slide on . There might be to much clearance for what you are specifically doing - just depends. If your usage is extremely critical then pursue a mm dimensional collar, if not a 3/8" will suffice.

To hold a 5" wheel 5/16 bore, using 5/16 collars, should I also use 5/16 flat and lock washers ?

I would say a flat washer. But be sure to dimple -drill a shallow hole where the set screw will engage the shaft. Tighten the setscrew down add lock tight also.

5 8 Bore Shaft Collar With Zinc Plated Coating Suitable

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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B/.21

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock in Performance, Unlock Your Productivity!

SECURE LOCKDOWN - Socket cup-point set screw guarantees your collar stays firmly in place, eliminating unwanted movement.
VALUE PACK CONVENIENCE - Includes 4 solid steel collars and screws, giving you a ready-to-go solution for multiple projects or replacements.
PRECISION FIT ZERO SLIP - Engineered 5/8" bore ensures a snug, reliable grip on your shafts for flawless performance.
VERSATILE INDUSTRIAL STRENGTH - Perfect for everything from lawn tractors to medical equipment—trusted across industries for dependable axial and radial support.
BUILT TO LAST BUILT TO RESIST - High-quality carbon steel with zinc plating offers superior corrosion resistance and durability in any environment.

The AZSSMUK 5/8" Bore Solid Steel Zinc Plated Set Screw Shaft Collars are precision-engineered components made from high-quality carbon steel with a corrosion-resistant zinc coating. Designed for secure shaft mounting with a 5/16-18×1/4 socket cup-point set screw, these collars provide durable axial and radial support across a wide range of industrial and mechanical applications, including lawn tractors, garage doors, and manufacturing equipment. Sold in a convenient 4-piece pack, they combine reliability and value for professionals seeking long-lasting performance.

Specifications

ASIN	B07C9SZKW9
Best Sellers Rank	#16,123 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Clamp-On Shaft Collars #4 in Mechanical Shafting
Date First Available	March 31, 2018
Item Weight	5.9 ounces
Manufacturer	DAOE
Package Dimensions	2.6 x 2.6 x 0.55 inches

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