EFOG.TECH® Ball Transfer Units
A Ball Transfer Unit is a load-bearing sphere (the load ball) resting on a bed of smaller bearing balls. The part code tells you what each is made of and how big they are.
Example part number
LSize
class SLoad ball
material CBearing ball
material – 3Bearing ball
Ø (mm) – 58Load ball
Ø (mm)
class SLoad ball
material CBearing ball
material – 3Bearing ball
Ø (mm) – 58Load ball
Ø (mm)
Size class
Outer dimensions of the unit — the body diameter and total height of the housing.
L12.6 mm body · 10 mm height
STBD
Load ball material
The large ball that carries the load and contacts your product.
SStainless steel, G10 grade
BBearing steel, G10 grade
Bearing ball material
The small balls underneath that let the load ball roll in any direction.
SStainless steel, G10 grade
CCeramic, G5 grade
Bearing ball Ø
Diameter of the small bearing balls, in millimetres. More than one digit implies a decimal point. Here 3 = 3 mm, and 1588 = 1.588 mm.
Load ball Ø
Diameter of the load ball, in millimetres. More than one digit implies a decimal point. Here 8 = 8 mm, and 58 = 5.8 mm.
Cross-section of a ball transfer unit
Load ball (S/B)
Bearing balls (C/S/B)