The best 1-inch lock collar depends on the shaft fit, material, and installation method you need. For a 1-inch shaft, the AR-PRO zinc-plated steel collars offer a four-piece set, while the AZSSMUK stainless-steel set is better suited to buyers prioritizing corrosion resistance. Split-clamp designs are useful when you need to install a collar without sliding it off the shaft end. Check each product’s listed bore carefully: one option below measures 25 mm, not a full 1 inch.
| Product | Best For | Pack |
|---|---|---|
| AR-PRO Zinc-Plated Steel | General-purpose steel collar set | 4 |
| AZSSMUK Stainless Steel | Corrosion resistance | 4 |
| AZSSMUK Black Oxide, 4-Pack | Split-clamp installation and quantity | 4 |
| AZSSMUK Black Oxide, 2-Pack | Smaller split-collar set | 2 |
| Aluminum Alloy 25 mm Collar | Applications specified for 25 mm shafts | 4 |
AR-PRO Zinc-Plated Steel Shaft Collars
Best for: Buyers who need several conventional steel collars for machinery or other general-purpose shaft applications. This four-pack has a stated 1-inch bore and socket cup-point set screws.
The collars are made from carbon steel with zinc-plated coating. Listed dimensions are a 1.63-inch outside diameter and 0.625-inch width. The product description says the coating provides corrosion resistance and that the steel offers axial and radial support.
Why it was selected: The stated 1-inch bore and four-piece quantity make it a practical option when you need multiple solid collars. Limitation: This is a solid set-screw style, not a split-clamp collar, and its coating should not be mistaken for stainless steel.
AZSSMUK 304 Stainless Steel Split Collars
Best for: Buyers who want a split collar made from stainless steel. The product listing specifies 304 stainless steel and describes it as offering better corrosion resistance than regular steel.
This four-piece set has a 1-inch bore, a 1.75-inch outside diameter, and a 0.5-inch width. Its two-piece design can be separated and reassembled at a point along the shaft, so installation does not require access to a shaft end. The listing also notes weldability as a material benefit.
Why it was selected: It combines the requested bore size with a split design and a corrosion-resistant material. Limitation: The provided features do not specify a coating or include additional dimensional tolerances, so confirm the fit requirements for precision work.
AZSSMUK Black Oxide Double-Split Collars, Four-Pack
Best for: Buyers who need multiple 1-inch double-split collars and want a clamp-on design. The pack contains four collars and eight set screws, according to the listing.
Each collar has a 1-inch bore, a 1.75-inch outside diameter, and a 0.5-inch height. The listing identifies a 1/4-28 set screw and describes the split-locking design as easy to install. The split construction allows the collar to be positioned around a shaft rather than requiring it to slide on from an end.
Why it was selected: It offers a stated 1-inch bore, split installation, and a larger set quantity. Limitation: The listed material is not specified in the supplied features, so do not assume it has the same corrosion resistance as the stainless-steel option.
AZSSMUK Black Oxide Double-Split Collars, Two-Pack
Best for: Buyers who want the listed black oxide split-collar format but need only two pieces. Its stated dimensions match the four-pack version: 1-inch bore, 1.75-inch outside diameter, and 0.5-inch height.
The product includes two double-split clamp-on collars and two set screws. The listing identifies a 1/4-28 set screw and describes the design as easy to install. As with other split collars, this form is useful when the shaft end is inaccessible or other components would make sliding on a solid collar difficult.
Why it was selected: It gives buyers a smaller pack option with a clearly stated 1-inch bore and split construction. Limitation: It provides fewer collars than the four-piece alternatives, and the supplied features do not identify the base material.
Aluminum Alloy 25 mm Double-Split Collars
Best for: Buyers whose application calls for a 25 mm bore and an aluminum alloy collar. The four-piece set includes a hexagon socket screw for each collar, and the listing describes the material as corrosion-resistant and anti-oxidizing.
Listed dimensions are 25 mm inner diameter, 45 mm outer diameter, and 12 mm thickness. The listing also specifies a 6 mm keyway width and describes automotive and go-kart-related uses.
Why it was selected: It is a split locking collar with features relevant to buyers comparing inch-size listings and vehicle-related applications. Important limitation: 25 mm is approximately 0.984 inch, not a full 1-inch bore. Choose it only if that measurement suits the shaft and keyway requirements.
Buying Guide: How to Choose a 1-Inch Lock Collar
Is the bore exactly 1 inch?
Match the collar bore to the shaft diameter rather than relying on a product title alone. The four AZSSMUK and AR-PRO options above state a 1-inch bore. The aluminum option states 25 mm, which is slightly smaller than 1 inch. For close-fitting applications, verify the shaft and collar dimensions before ordering.
Should you choose a split collar or a solid collar?
A split collar can be assembled around a shaft, which is helpful when the shaft end is blocked or removing connected components is inconvenient. A solid set-screw collar slides onto the shaft from an accessible end. Choose the installation style that suits the machine layout and maintenance needs.
Which material and finish fit the environment?
Stainless steel is the clearest choice among these products when corrosion resistance is a priority. The AR-PRO collar uses zinc-plated carbon steel, while the black oxide products list a finish but do not specify their base material in the supplied features. Aluminum alloy may suit buyers seeking that material, but check the exact application requirements.
What dimensions and hardware should you compare?
Compare outside diameter, width or height, set-screw details, and pack quantity in addition to bore size. These dimensions affect available clearance and fit around nearby components. Confirm whether the listed screws and any keyway details match the assembly before choosing.
Frequently Asked Questions
What does a 1-inch bore mean?
It is the stated inside diameter of the collar. It is intended to fit a shaft measuring 1 inch in diameter, subject to the actual tolerances and fit requirements.
Can a split collar be installed without removing the shaft?
A split collar can be opened and positioned around a shaft, so it does not need to slide on from the shaft end. Follow the product’s assembly instructions.
Is a 25 mm collar the same size as a 1-inch collar?
No. A 25 mm bore is approximately 0.984 inch, slightly smaller than 1 inch. Check the shaft diameter before selecting it.
Which listed collar is stainless steel?
The AZSSMUK four-piece double-split collar set is listed as 304 stainless steel.
What is the difference between the two black oxide options?
Both list a 1-inch bore and matching outside diameter and height. The main stated difference is quantity: one set contains four collars, and the other contains two.