Spheric-Trafalgar BTU's are based on the principle of a larger ball circulating on a bed of smaller balls which reduces friction and results in a smoother movement.

In their construction, the bodies may be machined from rod, pressed from sheet or moulded from plastic. The materials used may be stainless steel 304, 440 0r 420, through hardened chrome steel 52100, case hardened mild steel or plastic. Sometimes plated if required. All top cover surfaces are corrosion resisting, made from stainless steel, plated bright metal or plastic.

Specials are also available.

The physical design of the units usually incorporate:

• The cover at an angle to reduce damage to the major ball.
• Drain holes in the base to allow foreign matter to run out.
• Felt seals to reduce the intake of dirt and other foreign mater into the rolling element.

 

Model	Ref.	Dia of large ball	D (mm)	D1 (mm)	h (mm)	H (mm)	a (mm)	Load (kg)	Unit Wt (kg)
	AU8	8mm	18	18	2	12	-	15	0.015
	AU12	1/2" (12.7mm)	22 ±0.065	22	5.5	16.5	-	15	0.030
	AU15	5/8" (15.87mm)	24 ±0.060	31.5	10	21	3.5	35	0.060
	AU22	7/8" (22.22mm)	36 ±0.080	45	9.8	30.5	6.0	90	0.185
	AU25	1" (25.40mm)	38 ±0.080	45	13.5	31	10	100	0.210
	AUFL8	1" (25.40mm)	38.1	73	14.2	30.1	3.2	55	0.170
	AUFL10	1 1/4" (31.74mm)	46.0	73	16.2	36.1	4.2	110	0.265