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By certification 
As per production progress, the shaft including:
SF (normal standard shaft);
SFC (chrome plating standard shaft);
SFT( drilled hole shaft);
SFCT(chrome plating drilled hole shaft);
SPS(hollow shaft);
SPCS(chrome plating hollow shaft);
SFSS(stainless shaft);
cylinderlinear rail series: including Dia. size 6mm, 8mm, 10mm, 12mm, 13mm, 15mm,16mm, 20mm,25mm,28mm, 30mm, 32mm, 35mm, 40mm, 45mm, 50mm, 60mm.
SF (normal standard shaft);
SFC (chrome plating standard shaft);
SFT( drilled hole shaft);
SFCT(chrome plating drilled hole shaft);
SPS(hollow shaft);
SPCS(chrome plating hollow shaft);
SFSS(stainless shaft);
cylinderlinear rail series: including Dia. size 6mm, 8mm, 10mm, 12mm, 13mm, 15mm,16mm, 20mm,25mm,28mm, 30mm, 32mm, 35mm, 40mm, 45mm, 50mm, 60mm.
