Minimum Diameter Retainers

These bulkhead Retainers below are used to securely hold the motors in Minimum-Diameter Rockets. The Retainer is glued into the body of the rocket then you just slide the motor in and screw onto the stud.
The Retainer is installed to accommodate the largest motor you plan to use for the rocket and Extensions are used to install smaller motors.

38mm MD Retainer with Bypass holes and Eye-Bolt

38mm MD Retainer with Bypass holes and Eye-Bolt

Minimum Diameter Retainer, 38mm, with Bypass Holes and Eye-Bolt. For 38mm Minimum Diameter Airframes or 38mm Motor Mount Tubes Includes Holes That Allow Ejection Charge Gases To Bypass Retainer For Use With AeroTech Forward Closure Adapter P/N 38FCRRA Precision Machined 6061-T6 Aluminum With...
$22.00

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54mm MD Motor Retainer with welded Eye-Bolt

54mm MD Motor Retainer with welded Eye-Bolt

Minimum Diameter Motor Retainer, 54mm, with 3/16 Welded SS Eye-Bolt For 54mm Minimum Diameter Airframes or 54mm Motor Mount Tubes Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing 5/16-18 Stainless Steel Stud For Fast, Tape-Free & Tool-Free Motor Change Requires Forward...
$26.00

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Cesaroni Pro38 Delay/Eject-Closure Adapter

Cesaroni Pro38 Delay/Eject-Closure Adapter

Attaches To Pro38 Delay/Eject-Closure Has 5/16-18 Threaded Hole In Top Allows Pro38 Motor To Mount On Aero Pack M38 Bulkhead Retainer Pilot Pin Seals Hole and Guides Adapter When Mounting Requires 7/8" Wrench or Socket To Install Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red...
$12.00

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Cesaroni Pro54 Delay/Eject-Closure Adapter

Cesaroni Pro54 Delay/Eject-Closure Adapter

Attaches To Pro54 Delay/Eject-Closure Has 5/16-18 Threaded Hole In Top Allows Pro54 Motor To Mount On Aero Pack M54 Bulkhead Retainer Pilot Pin Seals Hole and Guides Adapter When Mounting Requires 7/8" Wrench or Socket To Install Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red...
$14.00

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MD Extension, 5/16 Stud, 1.8-2.2"L

MD Extension, 5/16 Stud, 1.8-2.2"L

Minimum Diameter Retainer Extension, 5/16 Stud, 1.8-2.2" Length For 38mm & 54mm Minimum Diameter Retainers Allows Use Of Shorter Length Motors Adjustable Length From 1.8-2.2 Inches Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing 5/16-18 Stainless Steel Stud & 2...
$9.00

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MD Extension, 5/16 Stud, 2.2-3.0"L

MD Extension, 5/16 Stud, 2.2-3.0"L

Minimum Diameter Retainer Extension, 5/16 Stud, 2.2-3.0" Length For 38mm & 54mm Minimum Diameter Retainers Allows Use Of Shorter Length Motors Adjustable Length From 2.2-3.0 Inches Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing 5/16-18 Stainless Steel Stud & 2...
$10.50

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MD Extension, 5/16 Stud, 3.0-4.5"L

MD Extension, 5/16 Stud, 3.0-4.5"L

Minimum Diameter Retainer Extension, 5/16 Stud, 3.0-4.5"L Length For 38mm & 54mm Minimum Diameter Retainers Allows Use Of Shorter Length Motors Adjustable Length From 3.0-4.5 Inches Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing 5/16-18 Stainless Steel Stud & 2...
$12.50

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MD Extension, 5/16 Stud, 4.5-6.6"L

MD Extension, 5/16 Stud, 4.5-6.6"L

Minimum Diameter Retainer Extension, 5/16 Stud, 4.5-6.6" Length For 38mm & 54mm Minimum Diameter Retainers Allows Use Of Shorter Length Motors Adjustable Length From 4.5-6.6 Inches Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing 5/16-18 Stainless Steel Stud & 2...
$14.00

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MD Extension Set, 4 each for 5/16 Studs

MD Extension Set, 4 each for 5/16 Studs

For 38mm & 54mm Minimum Diameter Retainers Allows Use Of Shorter Length Motors Includes 4 extensions, one each M1E1.8, M1E2.2, M1E3.0, M1E4.5 Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing Each extension has a 5/16-18 Stainless Steel Stud & 2 Stainless Steel Jam...
$43.95

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