Centering,Thrust & Cluster Rings

Centering rings are used to keep a small tube nested within a large one. For example BT50/BT20 will center BT20 tube inside the BT50.

Thrust rings or engine blocks are glued inside the motor mount and prevent motors from going forwards. Model rocket motors with a thrust ring (such as Aerotech motors) do not require an engine block installed in the rocket. Motors without a thrust ring (such as Estes A/B/C/D/E) require a motor block installed in the rocket. Cluster rings hold several motor tubes.

We offer centering and cluster rings for low, mid and high-power rockets, you can narrow your selection by clicking buttons below.

	BT5 Thrust Ring. 6 Pack 6 Engine Blocks for Mini Engines. Fits BT-5 Tube.	$1.30
	BT20 Thrust Ring. 6 Pack 6 Engine Blocks for Standard Engines. Fits BT-20 Tube. Engine Block or Thrust Ring is used to position the engine in the engine tube.	$1.75
	BT50 (24mm) Thrust Ring. 6 Pack 6 Engine Blocks for 24 mm Engine Mount. Fits BT-50 Tube. Engine Block or Thrust Ring is used to position the engine in the engine tube.	$1.95
	29mm Thrust Ring. 5 Pack 5 Kraft paper Thrust Rings Dimensions: 1.124" O.D. 1.02" I.D. 0.625" long Weight: 1.5g	$2.00
	BT50/BT20 Centering Rings. 6 pack This ring will center a BT-20 tube (standard engine mount tube) within a BT-50 tube.	$1.55
	BT55/BT20 Plywood Centering Rings. 6 Pack This ring will center a BT-20 tube (standard engine mount tube) within a BT-55 tube. Three disks have a motor hook slot.	$5.45
	BT60/BT20 Plywood Centering Rings. 6 Pack This ring will center a BT-20 tube (standard engine mount tube) within a BT-60 tube. Three disks have a motor hook slot.	$5.85
	BT70/BT20 Plywood Centering Rings. 4 Pack This ring will center a BT-20 tube (standard engine mount tube) within a BT-70 tube. Two disks have a motor hook slot.	$5.95
	BT80/BT20 Plywood Centering Rings. 4 Pack This ring will center a BT-20 tube (standard engine mount tube) within a BT-80 tube. Two disks have a motor hook slot.	$6.45
	BT55/BT50 Plywood Centering Rings. 6 Pack This ring will center a BT-50 tube within a BT-55 tube. Plywood. 3 rings have a notch to accommodate motor hook.	$5.45