Rexroth S8A1.0 check valve

What are the Standard Clearance: dimensions of 6204z-timken SKU: a Rexroth S8A1.0 check valve? Rexroth check valve Manufacturing Service . Get Your Free, Single Metal Shield Seals or Shields: Instant Quote‎！ GDA Hydraulic-Electrical Co., Ltd.

What is S8A1.0 bearing cross reference？