45# carbon steel universal joint connects two shafts and allows bending at any angle. Widely applied to various model cars and model boats. Compact, exquisite and long-lasting. Welcome your purchase.
 
The mark "4-5" means the bores on two ends are 4mm and 5mm separately, which can connect shafts with 4mm and 5mm diameters. If your motor shaft is 2mm and propeller shaft is 3mm, select size 2-3 (2-3 and 3-2 belong to the same specification).
 
【Material】: 45# Carbon Steel
 
【In-Stock Sizes】: 2-2mm, 2-2.3mm, 2.3-2.3mm, 2.3-3mm, 2.3-4mm, 3-3mm, 3-3.17mm, 3-4mm, 3-5mm, 3.17-3.17mm, 3.17-4mm, 4-4mm, 4-5mm, 5-5mm, 5-8mm, 6-4mm, 6-5mm, 6-6mm, 6-8mm, 8-8mm, 8-10mm, 10-10mm, 3-2mm, 4-2mm
 
【Outer Diameter】: The overall dimension varies based on bore sizes (reference sizes below):
 
  • Size 2-2.3 / 2.3-2.3: Outer diameter 8mm, total length approx 18mm, weight approx 5g
  • Size 2-2, 2.3-4, 3-3, 3-3.17, 4-4, 3-4, 3.17-3.17, 3.17-4, 3-2: Outer diameter 9mm, total length approx 23mm, weight approx 6g (Note: Size 2-2 weighs about 7.5g with the same length and outer diameter as others in this group)
  • Size 3-5, 4-5, 5-5, 6-4, 6-5, 6-6: Outer diameter 11mm, total length approx 24mm, weight approx 10g
  • Size 5-8, 6-8, 8-8: Outer diameter 14mm, total length approx 34mm, weight approx 25g
  • Size 8-10, 10-10: Outer diameter 16mm, total length approx 35mm, weight approx 30g
 
【Set Screw Accessories】
 
Sizes 3-4, 4-4, 3.17-4, 4-2, 2.3-4, 2-2, 2-2.3, 2.3-2.3, 2.3-3, 3-3, 3-2, 3.17-3.17, 3-3.17: Fitted with 2 pieces of 34 set screws
 
Sizes 4-5, 5-5, 6-4, 6-5, 6-6, 3-5: Fitted with 2 pieces of 44 set screws
 
Sizes 8-8, 5-8, 6-8, 8-10, 10-10: Fitted with 4 pieces of 4*4 set screws
 
【Hex Wrench Kit】
 
We specially launch an independent hex wrench pack (wrenches + spare screws) for customers without matching hex wrenches. The pack contains 1 piece of 1.5mm hex wrench, 1 piece of 2mm hex wrench, 5 pieces of 34 set screws and 5 pieces of 44 set screws. This pack can be purchased separately.
 
Note: If you need hex wrenches, please add the hex wrench pack to your shopping cart separately.
 
Custom special sizes are acceptable. The minimum order quantity for out-of-stock specifications is 500 pieces, and the unit price is consistent with in-stock items.

Thank you for browsing our products ♥ 

On 06/07/2026 at 12:31:21 AEST, seller added the following information:

Datacaciques