Semroc Centering Rings Fiber BT-20 to ST-20(2pk) SEM-CR-20-20
Laser-cut rings for centering a BT-20 motor tube inside a ST-20 tube
ID = 0.736"
OD = 2.2"
Thickness = 0.05"
Made in the USA
Warranty for 1 year from manufacturer defects
Categories
- Ad
- Clearance
- Specials
- Specials 40% Off
- New
- Starter & Launch Sets
- ARC Parts
- Educational Purchases
- SEMROC Rocket Kits
- Aerotech Rockets
- Altaira Rocketry
- ASP Rocket Kits
- Custom Rocket Kits
- Dr Zooch Rocket Kits
- Dynasoar Rocketry - Gliders
- DynaStar Rocket Kits by Apogee
-
Estes Rocket Kits
- Skill Level 1 Beginner
- Skill Level 2 Intermediate
- Skill Level 3 Advanced
- Skill Level 4 Expert
- Skill Level 5 Master
- Pro
- Estes Accessories
- Estes Parts
- Upgrade parts for Estes Mini A Heli
- Upgrades for Big Der Red Max 9721
- Upgrades for Pro Big Bertha 9719
- Upgrades for Pro Great Goblin 9724
- Upgrades for Pro Star Orbiter 9716
- LOC Precision Mid/High Power Rocket Kits
- Mad Cow Mid/High Power Rocket Kits
- MPC Rocket Kits
- NewWay Rocket Kits
- North Coast Rocketry(NCR) Rocket Kits
- Odd'l Rockets Rocket Kits
- Public Missiles(PML) Mid/ High Power Rocket Kits
- Quest Rocket Kits
- Rocketarium Rocket Kits
- Shrockets Rocket Kits
- Starlight Rockets
- Wildman Rocketry
- Rocket Motors
-
Parts for Rockets
- Aero Pack Motor Retainers
- Bulk Heads
- DHB Aerospace Rocket Parts
- Transitions
- Baffles
-
Body Tubes
- BTH-54mm
- M15-(15mm)
- M30-(30mm)
- M20-(20mm)
- M25-(25mm)
- M35-(35mm)
- M40-(40mm)
- M50-(50mm)
- BT-1+
- ST-2
- BT-2
- BT-2+
- BT-3
- BT-4
- BT-4+
- BT-5 & ST-5(13mm)
- BT-5+
- ST-6
- BT-19
- BT-20(18mm)
- ST-7(18mm)
- BT-30
- BT-20+
- ST-8
- ST-8F
- LT-085
- BT-50(24mm)
- BTH-50(24mm)
- ST-9(24mm)
- BT-50+
- BT-51
- BT-52
- ST-10
- ST-11
- BTH-52 & LT-115(29mm)
- BT-55
- LT-125
- ST-13
- BT-58
- BT-60 & ST-16
- LT-175
- ST-18
- BTH-1.88
- ST-20
- LT-200
- BT-70
- BTH-70
- BT-80
- BTH-80
- ST-27
- RT-99
- BT-100
- BT-101
- BT-3.0
- BTH-3.1
- BTH-4.0
- BTH-5.38
- BTH-7.51
- Clear all sizes
- BTH-38mm
-
Centering Rings
- Fits BT-60(ST-16)& ST-16 tube
- Fits BT-1+ tube
- Fits BT-2 tube
- Fits BT-3 tube
- Fits BT-4 tube
- Fits BT-5 tube
- Fits BT-19 tube
- Fits BT-20 tube
- Fits ST-7 tube
- Fits ST-8 tube
- Fits ST-8F tube
- Fits BT-50 & BTH-50 tube
- Fits BTH-50(24mm)
- Fits ST-9 tube
- Fits ST-10 tube
- Fits ST-11 tube
- Fits BTH-52 & LT-115(29mm) tube
- Fits ST-18 tubes
- Fits BT-55 tube
- Fits ST-13 tube
- Fits T-1.88"H tube
- Fits BT-56 tube
- Fits ST-20 tube
- Fits T-38mmH tube
- Fits BT-58 tube
- Fits T-2.0" tube
- Fits LT-150 tube
- Fits BT-60 & ST-16 tube
- Fits BT-70 & BTH-70 tube
- Fits LT-175 tube
- Fits ST-27 tube
- Fits T-54mm tube
- Fits T-2.5" tube
- Fits BT-80 & BTH-80 tube
- Fits T-3.0"H tube
- Fits 3.1" tube
- Fits BT-100 tube
- Fits BT-101 & T-4.0" tubes
- Fits T-5.5" tube
- Fits T-7.5" tube
- Quest Metric
- For Semroc Kits
-
Couplers
- Fits BT-60(ST-16)& ST-16 tube
- Fits BT-3 tube
- Fits BT-4 tube
- Fits BT-5 & ST-5 tube
- Fits ST-6 tube
- Fits BT-20 tube
- Fits ST-7 tube
- Fits BT-30 tube
- Fits BT-40 tube
- Fits ST-8 tube
- Fits ST-8F tube
- Fits LT-085 tubes
- Fits ST-9 tube
- Fits BT-50 & BTH-50 tube
- Fits BT-52 tube
- Fits ST-10 tube
- Fits ST-11 tube
- Fits LT-115 & BT-52H tubes
- Fits BT-55 tube
- Fits ST-13 tube
- Fits BT-58 tube
- Fits BT-60 & ST-16 tube
- Fits LT-175 tube
- Fits ST-18 tubes
- Fits T-1.88"H tube
- Fits ST-20 tube
- Fits BT-70 & BTH-70 tube
- Fits BT-80 & BTH-80 tube
- Fits BT-3.0"H tube
- Fits BT-100 tube
- Fits BT-101 tube
- Fits T-4.0"H tube
- Fits T-5.5 tube
- Fits T-7.5" tube
- Fits BTH-54mm tube
- Decal Making
- Decals for Kits
- Dowels
- Engine Hooks
- Fin Sheets of Balsa
- Fins
- Hardware/Metal Parts
- Instructions
- Launch Lugs, Buttons & Guides
- Motor Adaptors
- Motor Blocks
- Motor Casings
- Motor Mount.
- Motor Retention
-
Nose Cones
- Fits BT-2 tubes
- Fits BT-3 tube
- Fits BT-4 tube
- Fits BT-5 & ST-5 tube
- Fits ST-6 tube
- Fits BT-19 tube
- Fits BT-20 tube
- Fits ST-7 tube
- Fits BT-30 tube
- Fits BT-40 tube
- Fits ST-8 tube
- Fits ST-8F tube
- Fits BT-50 tube
- Fits ST-9 tube
- Fits BT-51 tube
- Fits BT-52 tube
- Fits ST-10 tube
- Fits ST-11 tube
- Fits BT-55 tube
- Fits LT-125 tube
- Fits ST-13 tube
- Fits BT-56 tube
- Fits BT-58 tube
- Fits BT-60 & ST-16 tube
- Fits BT-65 tube
- Fits ST-18 tube
- Fits BTH-1.9" tube
- Fits ST-20 tube
- Fits BT-70 tube
- Fits BTH-70 tube
- Fits BT-80 tube
- Fits BTH-80 tube
- Fits BTH-3.1" tube
- Fits BTH-101 or BTH-4.0" tube
- Fits BTH-5.38" tube
- Fits BTH-3.9" tube
- Fits BTH-7.51" tube
- Fits LT-085 Tubes
- Fits LT-115 or BTH-52 Tubes
- Fits LT-175 Tubes
- Fits BT-10 & BT-20 Tubes
- Fits BTH-38mm Heavy Walled Tube
- Fits M15 tube(BC-T15)
- Fits M20 tube(BC-T20)
- Fits M25 tube(BC-T25)
- Fits M30 tube(BC-T30)
- Fits M35 tube(BC-T35)
- Fits M40 tube(FNC-T40)
- Recovery Devices
- Screw Eyes
- Shock Cords - Kevlar - Elastic - Nylon
- Shrouds & Pattern Sheets
- Specialty Parts
- Tail Cones
- Tools to build kits
- Transitions Reducers
- Weights
- Wraps - Body
- Tools, Accessories, Other Stuff
-
Finishing Supplies
- Applicators
- Gundam Spray Painting and Paint Markers
- Mission Models Clear & Thinner
- Mission Models Metalics
-
Mission Models Paints
- Allied Armor USA
- Basics
- British Aircraft WWII
- British Armor WWII
- Color Changing
- Flats
- Gaming Fantasy Sci-fi
- German Aircraft WWII
- German Armor WWII
- Gloss
- Heavy Equipment & Automotive
- Japanese Aircraft WWII
- Metallics
- Modern Armor
- NATO
- Olive
- Pearl and Iridescent
- Russian
- Transparents
- US Modern Aircraft & WWII
- US Navy Ships
- Weathering Colors
- Mission Models Primer
- Mission Models Weathering
- Putty & Filler
- Sanding Sealer
- Spray Clears
- Tamiya Spray Paint
- Testors Sprays
- Miscellaneous
- Air Rockets
- Water Rockets
- Plastic Models
- Apparel
- Kites
- Wright Stuff Rocketeers Section Items
- Gift Items
- Other
- Humor Only
- Pyrotechnical Supplies
- Skill Level
- Attributes
Navigate
- Buying an eRockets Gift Certificate
- View Products
- Visit eRockets
-
References
- Product Advisories and Recalls
- the Rocketry Show - the Model Rocket Show
- Beginners guide to rocketry
- Body Tube Sizes
- Body Tube/ Centering Ring Measuring Guide
- Parachute Sizes to Rocket Weight by Top Flight
- Shroud Calculator for making paper transition shrouds
- Trimming Your Gliders
- Rocketry Organizations & Launch Schedules
- Open Rockets
- Rocket Plans & Instructions
- Using eRockets Prusa Printer
- RSS Syndication
- Contacts
- Educators
- News
- About eRockets
- Blog
- Policies
