1. Stainless steel linear smooth shaft (SF):
Due to the point-to-surface contact between the stainless steel linear smooth shaft and the linear sliding ring, the surface hardness requirements for ordinary linear smooth shafts are very high. Therefore, the material and heat treatment methods are critical.
Material: SUJ2 (equivalent to Chinese standard GCr15).
Hardness: HRC60 ± 2.
Hardened layer depth: 0.8–3 mm.
Surface roughness: Ra 0.10 μm – Ra 0.35 μm.
Straightness: ≤ 70 μm / 1000 mm.
Shaft outer diameter tolerance: g6.

2. Chrome-plated linear smooth shaft (SFC):
The chrome-plated linear smooth shaft is coated with a layer of hard chromium on the basis of an ordinary linear smooth shaft, making it suitable for rust-prone or harsh environments. This shaft is widely used in industrial robots and the moving parts of automatic sliding systems.
Material: SUJ2 (equivalent to Chinese standard GCr15).
Hardness: HRC60 ± 2.
Hardened layer depth: 0.8–3 mm.
Surface roughness: Ra 0.10 μm – Ra 0.35 μm.
Straightness: ≤ 70 μm / 1000 mm.
Chrome plating thickness: 3 μm – 5 μm.
Shaft outer diameter tolerance: g6.

3. Stainless steel linear smooth shaft (RSFC):
The chrome-plated linear soft shaft can be directly used for precision piston rods and matched with self-lubricating sliding rings due to its thick chrome plating layer. Its moderate hardness makes it applicable in many fields.
Material: 45# steel, 40Cr, or 2Cr13.
Hardness: HB220–260.
Hardened layer depth: 0.8–3 mm.
Straightness: ≤ 0.15 mm / 1000 mm.
Chrome plating thickness: 0.02–0.05 mm.

4. Stainless steel linear smooth shaft:
Stainless steel linear shafts exhibit high corrosion resistance, high strength, and wear resistance, maintaining efficient operational performance. Thus, they can be applied in oxidation-prone environments such as water, chemicals, steam, seawater, etc.
Material: SUS404C, SUS304.
Hardness: HRC60 ± 2.
Hardened layer depth: 0.8–3 mm.
Surface roughness: Ra 0.10 μm – Ra 0.35 μm.
Straightness: ≤ 70 μm / 1000 mm.
Chrome plating thickness: 3 μm – 5 μm.
Shaft outer diameter tolerance: g6.