Semroc Centering Rings Fiber ST-7 to BT-20(2 pieces set with engine hook slot) SEM-CR-7-20EH
Laser-cut fiber rings which center an ST-7 motor tube inside an ST-20 tube
Especially useful for making a standard engine mount for ST-20 rocket bodies
Requires one set of two rings
Thickness is 0.05" (.127cm)
ID= 0.759" (1.927cm)
OD= 2.042" (5.18cm)
Made in the USA
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