Recently, I was trying to match up some of my residual pieces & parts to build some small rockets to give to the kids (well, I’ll keep some of them for myself). I found the task daunting as I didn’t know the size designation for each piece, and there are LOTS of different sizes! It seems like everybody who sold kits had/has a different set of tube sizes. So Randy Boadway at eRockets provided the DEFINITIVE listing of size designations and their dimensions. Better yet, all of these sizes are available at http://www.erockets.biz/ with low prices, quick delivery and great customer service.
Size Notes = OD (in), ID (in), Wall (in)
BT-1+ Body Tube ¼” Diameter = OD 0.246, ID 0.220, wall 0.013
ST-2 Standard Tube, Special Semroc Size = OD 0.260, ID 0.234, wall 0.013
BT-2 Body Tube Fits Quest Micro Motor Mount (Slips Over BT-1+) = OD 0.281, ID 0.255, wall 0.013
BT-2+ Body Tube Slips Over BT-2 = OD 0.310, ID 0.297, wall 0.013
BT-3 Body Tube 3/8″ OD = OD 0.375, ID 0.349, wall 0.013
BT-4 Body Tube Apogee Micro Motor Mount = OD 0.448, ID 0.422, wall 0.013
BT-4+ Body Tube Slips Over BT-4 = OD 0.478, ID 0.452, wall 0.013
BT-5 & ST-5 Body Tube 13mm Motor Mount (Centuri Standard Tube ST-5) = OD 0.543, ID 0.515, wall 0.013
BT-5+ Body Tube Slips Over BT-5 = OD 0.585, ID 0.559, wall 0.013
ST-6 Centuri Standard Tube = OD 0.650, ID 0.610, wall 0.020
BT-19 Body Tube Special Semroc Size = OD 0.700, ID 0.674, wall 0.013
BT-20 Body Tube 18mm Motor Mount = OD 0.736, ID 0.710, wall 0.013
ST-7 Centuri Standard Tube = OD 0.759, ID 0.715, wall 0.022
BT-30 Body Tube Special Semroc Size = OD 0.767, ID 0.725, wall 0.021
BT-20+ Body Tube Slips Over BT-20 = OD 0.770, ID 0.744, wall 0.013
BT-40 Body Tube Special Semroc Size = OD 0.825, ID 0.765, wall 0.030
ST-8 Centuri Standard Tube = OD 0.908, ID 0.865, wall 0.022
ST-8F Centuri Standard Tube 8F = OD 0.921, ID 0.885, wall 0.018
LT-085 Large Tube = OD 0.945, ID 0.865, wall 0.040
BT-50 Body Tube 24mm Motor Mount = OD 0.976, ID 0.950, wall 0.013
BTH-50 Body Tube Foil lined HD 24mm Motor Mount (also BT-50H) = OD 0.992, ID 0.950, wall 0.021
ST-9 Centuri Standard Tube = OD 0.998, ID 0.950, wall 0.024
BT-50+ Body Tube Slips Over BT-50 = OD 1.010, ID 0.984, wall 0.013
BT-51 Body Tube Special Semroc Size = OD 1.011, ID 0.985, wall 0.013
BT-52 Body Tube Special Semroc Size = OD 1.014, ID 0.988, wall 0.013
ST-10 Centuri Standard Tube (Slips Over BTH-50) = OD 1.040, ID 1.000, wall 0.020
ST-11 Centuri Standard Tube = OD 1.170, ID 1.130, wall 0.020
BTH-52 & LT-115 Body Tube 29mm Motor Mount (also BT-52H) = OD 1.210, ID 1.140, wall 0.035
BT-55 Body Tube = OD 1.325, ID 1.283, wall 0.021
LT-125 Large Tube = OD 1.340, ID 1.250, wall 0.045
ST-13 Centuri Standard Tube = OD 1.340, ID 1.300, wall 0.022
BT-56 Body Tube = OD 1.367, ID 1.346, wall 0.021
BT-58 Body Tube Special Semroc Size = OD 1.540, ID 1.498, wall 0.021
LT-150 Large Tube = OD 1.590, ID 1.500, wall 0.045
T-38mmH Tube Dimensional 38mm Motor Mount = OD 1.635, ID 1.525, wall 0.055
BT-60 & ST-16 Body Tube (Centuri Standard Tube ST-16) = OD 1.640, ID 1.600, wall 0.021
LT-175 Large Tube = OD 1.840, ID 1.750, wall 0.045
ST-18 Centuri Standard Tube = OD 1.840, ID 1.800, wall 0.021
T-1.88″ Tube Dimensional Aerotech 1.9″ = OD 1.880, ID 1.800, wall 0.040
ST-20 Centuri Standard Tube = OD 2.042, ID 2.000, wall 0.021
LT-200 Large Tube = OD 2.080, ID 2.000, wall 0.045
BT-70 Body Tube = OD 2.217, ID 2.175, wall 0.021
BTH-70 Body Tube Heavy = OD 2.247, ID 2.175, wall 0.036
LT-225 Large Tube = OD 2.340, ID 2.250, wall 0.045
BT-80 Body Tube = OD 2.600, ID 2.558, wall 0.021
BTH-80 Aerotech 2.6″ (also BT-80H) = OD 2.635, ID 2.558, wall 0.050
ST-27 Centuri Standard Tube = OD 2.700, ID 2.674, wall 0.013
LT-275 Large Tube = OD 2.840, ID 2.750, wall 0.045
T-3.0″H Tube Dimensional Heavy Wall = OD 3.000, ID 2.950, wall 0.050
ST-36 Centuri Standard Tube = OD 3.690, ID 3.600, wall 0.045
RT-99 Ring Tube Special Semroc Part = OD 3.700, ID 3.668, wall 0.016
BT-100 Body Tube = OD 3.744, ID 3.702, wall 0.021
BT-101 Body Tube = OD 3.938, ID 3.896, wall 0.021
T-4.5″ Tube Dimensional (1:1 scale Arcas) = OD 4.546, ID 4.476, wall 0.035