Supergrit Abrasives

Adapter Coupler – 1/4" Smooth Female to 1/2" Smooth Female, Includes 4 Set Screws (11055)

Adapter Coupler – 1/4" Smooth Female to 1/2" Smooth Female, Includes 4 Set - Main image
$12.05 $16.5 In stock

Adapter Coupler – 1/4" Smooth Female to 1/2" Smooth Female, Includes 4 Set Screws (11055)

This adapter collar allows you to mount a 1/2" bore wheel, drum, or accessory onto a 1/4" shaft. The four set screws securely hold the adapter and help prevent slipping during operation.

Common applications

  • Expanding or reducing shaft sizes
  • Mounting sanding drums or polishing wheels with a larger bore onto a smaller shaft
  • Bench grinders
  • Buffing and polishing machines
  • Expander wheels and other shop equipment
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Chloe H. ★★★★★

This coupler let me attach a 1/2" drum to my 1/4" shaft grinder without any wobble. The four set screws held it tight right out of the box.

Jacob ★★★★★

The set screws included are a nice touch—they held tight when I attached a 1/2" drum to my 1/4" shaft without any wobble. It’s a simple, solid little coupler that saved me from having to buy a whole new accessory.

Violet G. ★★★★★

This was the perfect solution for mounting a 1/2" drum on a 1/4" shaft, and the included set screws made installation a breeze. The coupler feels solid and well-machined, no wobble at all during use.