High Power Model Rocketry

Coupler Centering Ring

Coupler Centering Ring - Main image
Coupler Centering Ring - View 2
$1.73 $21.3 In stock

"Centering Rings (CR)" fit inside our airframe tubing while "Coupler Centering Rings (CCR)" fit inside our coupler tubing.

"Bookplates (BP)" fit inside our airframe tubing while "Coupler Bulkplates (CBP)" fit inside our coupler tubing.

"Piston Plates (PS)" fit inside of our coupler tubing and have a slot cut into the middle of the plate to accept a piston strap. All Piston Plates are 1/4” plywood.

Centring rings and bulk plates for airframes 3.9" and smaller are 1/4" birch plywood or G-10 while centring rings and bulk plates for airframes 6.0" and larger are 9-PLY 1/2" birch plywood.

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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)

Nicholas ★★★★★

After wrestling with a misaligned coupler on my last build, these rings were a welcome relief — they sit snugly inside the tubing with zero wobble. The fit is precise enough that I didn't need to sand anything down, which saved me a good hour of fiddling.

Charlotte R. ★★★★★

These coupler rings fit perfectly inside the tubing with zero sanding needed, which saved me a ton of time on my build. The precision machining is spot on for a snug, secure fit that I didn’t have to fight with.

Jacob ★★★★★

Snug fit inside the coupler tubing with no wobble at all, which is exactly what I needed for a clean motor mount. The rings are cut consistently, so centering the coupler took way less sanding than my last build.