Engine Mount Parts

This engine hook is for use with all 1.75 long model rocket engines including the Estes 1/4A, 1/2A, A3 and A10 mini engines. Grid spacing in photo is 1/2.

This engine hook is for use with all 3.75 long model rocket engines including the Estes E engines. Can also be used with 2.75 long model rocket engines by using a one inch long spacer (not included). Grid spacing in photo is 1/2.

The Balsa Machining Service 5/20 centering rings are used to center a BT5 tube (0.544 diameter) into a BT20 (0.736 diameter) body tube. Great for cloning, scratchbuilding and repairs! Made in the USA.

The Balsa Machining Service 20/55 centering rings are used to center a BT20 tube (0.736 diameter) into a BT55 (1.325 diameter) body tube. Great for cloning, scratchbuilding and repairs! Made in the USA.

The Balsa Machining Service 20/60 centering rings are used to center a BT20 tube (0.736 diameter) into a BT60 (1.637 diameter) body tube. Great for cloning, scratchbuilding and repairs! Made in the USA.

This centering ring is used to center a BT3 tube into a BT5 (0.544 diameter) body tube. Also, used as a mini engine block in 13 mm (BT5) engine tubes. Grid spacing in photo is 1/2.

This cluster centering ring is used to center four BT50 (0.976 diameter) tubes into a BT80 (2.600 diameter) body tube. Grid spacing in photo is 1/2.

The Custom CD 20-55 centering rings are precision die-cut discs that center an 18 mm (BT20) tube into a BT55 body tube. Comes in a 10 pack. Great for cloning, scratchbuilding and repairs!

An Estes 18mm engine retainer is used in place of an engine hook and allows you to easily change engines by turning the engine cap. Works great for those rockets that don't have fins that extend beyond the bottom of the body tube which normally wouldn't...

This Estes 24mm engine retainer is molded in a heat resistant ABS plastic which allows you to quickly and easily load and unload all Estes 24mm C11, D12 and E12 motors. Works great for those rockets that don't have fins that extend beyond the bottom of...

Includes an assortment of twenty six Estes centering rings to fit BT5, BT20, BT50 and BT55 tubes. Perfect for making your own engine mounts!Specifications: Material: Paper Includes: 8 - 5/20 centering rings, 4 - 5/50 centering rings, 8 - 20/50...

The Estes BT5-BT60 Laser Cut Centering Rings & Paper Adapters includes an assortment of thirty laser cut centering rings to fit BT5, BT20, BT50, BT55 & BT60 tubes and four heavyweight paper adapter shrouds to make BT5 to BT60 transitions and tail...

The Estes Engine Hook Accessory Pack contains enough engine hooks for one mini engine mount, two standard and D engine mounts and two E engine mounts. Includes:  1 - 1.75" engine hook, 3 - 2.75" engine hooks and 2 - 3.75" engine hooks.

The Qualman Rocketry CR5060 centering rings come in an 8 pack and are used to center a BT50 tube (0.976 diameter) into a BT60 (1.637 diameter) body tube. They are precision laser cut from heavy gauge cardstock. Great for cloning, scratch building and...

The Qualman Rocketry CR5070 centering rings come in a 4 pack and are used to center a BT50 tube (0.976 diameter) into a BT70 (2.217 diameter) body tube. They are precision laser cut from heavy gauge cardstock. Great for cloning, scratch building and...

The Qualman Rocketry CR5080 centering rings come in an 2 pack and are used to center a BT50 tube (0.976 diameter) into a BT80 (2.600 diameter) body tube. They are precision laser cut from heavy gauge cardstock. Great for cloning, scratch building and...