Stainless steel shims are widely used in industrial alignment, load adjustment, and precision spacing applications. Selecting the right material grade directly affects durability, corrosion resistance, and long-term performance.
Among austenitic stainless steels, SS 201 and SS 304 are two commonly used grades for shim manufacturing.
This guide explains the chemical composition, mechanical properties, corrosion resistance, and practical applications of SS 201 and SS 304 shim material.
The primary difference between SS 201 and SS 304 lies in nickel content.
Chromium: 18–20%
Nickel: 8–10.5%
Carbon: ≤ 0.08%
Chromium: 16–18%
Nickel: 3.5–5.5%
Manganese: 5.5–7.5%
Carbon: ≤ 0.15%
Higher nickel content in SS 304 enhances corrosion resistance and structural stability, while SS 201 uses higher manganese to reduce cost.
Corrosion resistance is one of the most critical factors in shim selection.
Suitable for marine environments
Resistant to many chemicals
Ideal for food-grade applications
Good resistance in dry indoor environments
Not recommended for high-salt or coastal areas
Suitable for general industrial applications
If the shim is exposed to water, chemicals, or outdoor conditions, SS 304 is generally preferred.
SS 201 may exhibit slightly higher tensile strength due to its manganese content.
However, SS 304 offers:
Better fatigue resistance
Improved long-term durability
More stable performance under vibration and cyclic loading
For precision machinery and heavy-duty applications, SS 304 shims provide greater reliability.
Nickel is a high-cost alloying element. Since SS 304 contains more nickel, its price fluctuates based on global nickel market trends.
SS 201 is more economical and often selected for bulk industrial applications where environmental exposure is limited.
Cost savings should always be balanced against performance requirements.
Structural adjustments
Equipment assembly
Budget-sensitive projects
Marine equipment
Chemical processing plants
Food processing units
Outdoor structural installations
The application is indoors
Corrosion exposure is minimal
Budget optimization is important
The environment involves moisture or chemicals
Long-term corrosion resistance is required
The application involves vibration or cyclic loads.
Material selection should always align with the operating environment and performance expectations.
Both SS 201 and SS 304 stainless steel shims serve important industrial purposes. The right choice depends on corrosion exposure, mechanical demands, and budget considerations.
Careful evaluation of application conditions ensures optimal performance and cost efficiency.
Unimix Metal Corporation is a leading manufacturer and supplier of shims, stainless steel coils, foils, and strips in a wide range of materials and grades.
17, Ramkutir Building, 12th Khetwadi Cross Lane, Mumbai 400 004.
Zaveri Bldg, 6, V. P. Road, C. P. Tank, Mumbai-400 004.
+ 91-22-67436772 |
+ 91 9821759598 |
+ 91 85910 99871
E-mail :
info@shimmanufacturer.com|
