Qualman Rocketry

BT-sized Centering Rings

The inner tube goes into the outer tube.  Coaxially.
You're going to need to make an engine mount.  You might even need to combine several tubes for your fancy rockets.

This means you're going to need some centering rings, and maybe even some thrust rings/engine blocks to hold the engine in place.

We offer precision laser cut centering rings - not die cut,  so there aren't any crushed edges.  They are made from heavy gauge cardstock, perfect for low power rocketry.

As a bonus, some of the sets for centering a BT5, a BT20, or a BT50 in larger tubes also include additional centering rings that can be used as thrust rings.  It's up to you to decide how many are needed for your design.  Or, they too can be used as centering rings.
BT-sized Multi-engine mount rings are here BT-sized fin aligning rings are here
Cardstock Rings, BT-sized
Inner and Outer
Tube Size		 InnerTube
Outside
Diameter		 Outer
Tube
Inside
Diameter		 Qty/
set		 *Price Image
BT05 to BT20
(aka 18mm thrust rings)		 0.541"
13.7mm		 0.710"
18mm		 8
CR05208
$0.99/set
BT05 to BT30
(aka BT30 thrust rings)		 0.541"
13.7mm		 0.725"
18.4mm		 8
CR05308
$0.99/set
BT05 to BT40
(aka BT40 thrust rings)		 0.541"
13.7mm		 0.765"
19.4mm		 8
CR05408
$1.49/set
BT05 to BT50
(plus 4 13mm thrust rings)		 0.541"
13.7mm		 0.950"
24.1mm		 8
(+4)
CR05508
$1.99/set
BT05 to BT55
(plus 4 13mm thrust rings)		 0.541"
13.7mm		 1.283"
32.6mm		 8
(+4)
CR05558
$1.99/set
BT05 to BT56
(plus 4 13mm thrust rings)		 0.541"
13.7mm		 1.304"
33.1mm		 8
(+4)
CR05568
$1.99/set
BT05 to BT60
(plus 4 13mm thrust rings)		 0.541"
13.7mm		 1.595"
40.5mm		 8
(+4)
CR05608
$1.99/set
4 sheets
BT05 to BT70
(plus 2 13mm thrust rings)		 0.541"
13.7mm		 2.175"
55.3mm		 4
(+2)
CR05704
$1.99/set
2 sheets
BT05 to BT80
(plus 2 13mm thrust rings)		 0.541"
13.7mm		 2.560"
65.0mm		 2
(+2)
CR05802
$1.49/set
2 sheets
BT20 to BT50
(plus 4 18mm thrust rings)		 0.736"
18.7mm		 0.950"
24.1mm		 8
(+4)
CR20508
$1.99/set
BT20 to BT55
 0.736"
18.7mm		 1.283"
32.6mm		 8
CR20558
$1.99/set
BT20 to BT56
 0.736"
18.7mm		 1.304"
33.1mm		 8
CR20568
$1.99/set
BT20 to BT60
(plus 4 18mm thrust rings)		 0.736"
18.7mm		 1.595"
40.5mm		 8
(+4)
CR20608
$1.99/set
4 sheets
BT20 to BT70
(plus 2 18mm thrust rings)		 0.736"
18.7mm		 2.175"
55.3mm		 4
(+2)
CR20704
$1.99/set
2 sheets
BT20 to BT80
(plus 2 18mm thrust rings)		 0.736"
18.7mm		 2.560"
65.0mm		 2
(+2)
CR20802
$1.49/set
2 sheets
BT50 to BT55
 0.976"
24.8mm		 1.283"
32.6mm		 8
CR50558
$1.99/set
BT50 to BT56
 0.976"
24.8mm		 1.304"
33.1mm		 8
CR50568
$1.99/set
BT50 to BT60
(plus 4 24mm thrust rings)		 0.976"
24.8mm		 1.595"
40.5mm		 8
(+4)
CR50608
$1.99/set
4 sheets
BT50 to BT70
 0.976"
24.8mm		 2.175"
55.3mm		 4
(+2)
CR50704
$1.99/set
2 sheets
BT50 to BT80
(plus 2 24mm thrust rings)		 0.976"
24.8mm		 2.560"
65.0mm		 2
(+2)
CR50802
$1.49/set
2 sheets
BT55 to BT60
 1.325"
33.7mm		 1.595"
40.5mm		 8
CR55608
$1.99/set
4 sheets
BT55 to BT70
 1.325"
33.7mm		 2.175"
55.3mm		 4
CR55704
$1.99/set
2 sheets
BT55 to BT80
 1.325"
33.7mm		 2.560"
65.0mm		 2
CR55802
$1.49/set
2 sheets
BT56 to BT60
 1.346"
34.2mm		 1.595"
40.5mm		 8
CR56608
$1.99/set
4 sheets
BT56 to BT70
 1.346"
34.2mm		 2.175"
56.3mm		 4
CR56704
$1.99/set
2 sheets
BT56 to BT80
 1.346"
34.2mm		 2.560"
65.0mm		 2
CR56802
$1.49/set
2 sheets
BT60 to BT70
 1.637"
41.6mm		 2.175"
60.3mm		 4
CR60704
$1.99/set
2 sheets
BT60 to BT80
 1.637"
41.6mm		 2.560"
65.0mm		 2
CR60802
$1.49/set
2 sheets
BT70 to BT80
 2.217"
56.3mm		 2.560"
65.0mm		 2
CR70802
$1.49/set
2 sheets
* Parts are sometimes built to order.   Please allow 2-3 business days for production.

Copyright Qualman Rocketry, 2016