You are looking at a stainless steel bar specification. It says “2B finish¹” or “No.4 finish².” You know these finishes look different, but what do they actually mean for your project?

Stainless steel bar surface finishes range from dull (No.1 hot rolled) to mirror-like (No.8 polished). The most common finishes are 2B (smooth, bright, cold rolled), No.4 (brushed, satin, architectural), BA (bright annealed, mirror-like), and No.8 (highly reflective mirror). The choice affects appearance, corrosion resistance, cleanability, and cost.

I have supplied stainless steel bars with all these finishes. A medical device maker used 2B finish¹. A handrail fabricator used No.4 finish². A decorative trim maker used BA finish. Let me walk you through the differences.

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What are the different types of stainless steel finishes?

Stainless steel finishes are classified by their production method and surface appearance. The main types are No.1 (hot rolled)¹, 2B (cold rolled)², No.4 (brushed)³, BA (bright annealed)⁴, and No.8 (mirror polished).

No.1 is dull, rough, and used for industrial applications. 2B is smooth, bright, and the most common for general fabrication. No.4 is brushed satin, the architectural standard. BA is mirror-like without polishing. No.8 is highly reflective mirror. Each finish has different roughness, reflectivity, and cost.

Finish Classification Overview

Let me provide an overview of the main stainless steel finishes.

No.1 Finish (Hot Rolled)

Property	Value
Production	Hot rolled, annealed, pickled
Appearance	Dull, rough, gray
Roughness (Ra)	2-5 microns
Best for	Industrial tanks, pressure vessels
Cost	Lowest

2B Finish (Cold Rolled)

Property	Value
Production	Cold rolled, annealed, skin pass
Appearance	Smooth, bright, silver
Roughness (Ra)	0.1-0.5 microns
Best for	General fabrication, food equipment
Cost	Moderate

No.4 Finish (Brushed)

Property	Value
Production	2B sheet polished with 120-180 grit
Appearance	Brushed, satin, grain lines
Roughness (Ra)	0.2-0.5 microns
Best for	Handrails, architectural, kitchen
Cost	Higher than 2B

BA Finish (Bright Annealed)

Property	Value
Production	Cold rolled, bright annealed in H2
Appearance	Mirror-like, highly reflective
Roughness (Ra)	0.05-0.1 microns
Best for	Decorative trim, automotive
Cost	Higher

No.8 Finish (Mirror Polished)

Property	Value
Production	Polished with fine abrasives
Appearance	Highly reflective mirror
Roughness (Ra)	<0.05 microns
Best for	High-end decorative, architectural
Cost	Highest

My Experience
For a chemical tank, we used No.1 finish. For a food processing line, we used 2B. For a hotel handrail, we used No.4.

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What is the difference between 304 2B¹ and 304 4 finish?

304 2B¹ is a smooth, bright, cold rolled finish. 304 No.4² is a brushed, satin finish produced by polishing 2B sheet with 120-180 grit abrasives.

2B finish has no visible grain lines (other than rolling direction) and is moderately reflective. No.4 finish has a uniform, directional satin appearance with visible grain lines. 2B is used for general fabrication and food equipment. No.4 is used for architectural applications (handrails, cladding) where a non-reflective, brushed appearance is desired.

2B vs No.4 Comparison

Let me compare these two finishes in detail.

304 2B¹ Finish

Property	Value
Appearance	Smooth, bright, reflective
Grain	Directional but not pronounced
Reflectivity	Moderate
Roughness (Ra)	0.1-0.5 µm
Scratch hiding	Poor
Cost	Lower
Applications	General fabrication, food equipment

304 No.4² Finish

Property	Value
Appearance	Brushed, satin, grain lines
Grain	Directional, uniform satin
Reflectivity	Low (non-reflective)
Roughness (Ra)	0.2-0.5 µm
Scratch hiding	Good
Cost	Higher (polishing cost)
Applications	Handrails, cladding, kitchen

Which to Choose?

Application	Recommended Finish
Kitchen sinks (visible)	No.4
Kitchen sinks (underside)	2B
Handrails	No.4
Food processing tanks	2B
Building cladding	No.4
Medical devices	2B
Elevator panels	No.4

My Experience
For a restaurant kitchen, we used No.4 for the visible countertops (looks professional, hides scratches). For the hidden undersides, we used 2B to save cost.

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What are the 5 types of finishes?

The 5 most common stainless steel finishes¹ are No.1 (hot rolled), 2B (cold rolled), No.4 (brushed)², BA (bright annealed)³, and No.8 (mirror polished)⁴. Each has different properties and applications.

These five finishes cover the vast majority of stainless steel bar and sheet applications. No.1 is for industrial use. 2B is for general fabrication. No.4 is for architectural. BA is for decorative. No.8 is for high-end decorative and optical applications.

The 5 Finishes Explained

Let me detail each of the 5 common finishes.

Finish 1: No.1 (Hot Rolled)

• Production: Hot rolled, annealed, pickled
• Appearance: Dull, rough, gray, scale removed
• Roughness: 2-5 µm Ra
• Cost: Lowest
• Use: Industrial tanks, pressure vessels

Finish 2: 2B (Cold Rolled)

• Production: Cold rolled, annealed, skin pass
• Appearance: Smooth, bright, silver
• Roughness: 0.1-0.5 µm Ra
• Cost: Moderate
• Use: General fabrication, food equipment

Finish 3: No.4 (Brushed)

• Production: Polished 2B with 120-180 grit
• Appearance: Brushed, satin, grain lines
• Roughness: 0.2-0.5 µm Ra
• Cost: Higher
• Use: Handrails, architectural, kitchen

Finish 4: BA (Bright Annealed)

• Production: Cold rolled, bright annealed in H2
• Appearance: Mirror-like, highly reflective
• Roughness: 0.05-0.1 µm Ra
• Cost: Higher
• Use: Decorative trim, automotive

Finish 5: No.8 (Mirror Polished)

• Production: Polished with fine abrasives
• Appearance: Highly reflective mirror
• Roughness: <0.05 µm Ra
• Cost: Highest
• Use: High-end decorative, optical

Quick Reference Table

Finish	Appearance	Roughness (Ra)	Relative Cost
No.1	Dull, rough	2-5 µm	1.0×
2B	Smooth, bright	0.1-0.5 µm	1.2×
No.4	Brushed, satin	0.2-0.5 µm	1.5×
BA	Mirror-like	0.05-0.1 µm	1.8×
No.8	Highly reflective	<0.05 µm	2.5×

My Experience
For most projects, 2B or No.4 are the most common choices. No.1 is for heavy industrial. BA and No.8 are for high-end decorative.

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What is a Type 4 stainless steel finish?

Type 4 finish¹ (also called No.4 finish) is a brushed, satin finish produced by polishing stainless steel with 120-180 grit abrasives. It is the standard architectural finish for stainless steel.

No.4 finish has a uniform, directional satin appearance with visible grain lines. It is non-reflective² (low glare) and hides scratches better than 2B or BA. It is used for handrails, kitchen equipment, building cladding, elevator panels, and any application where a brushed metal appearance is desired.

Type 4 (No.4) Finish Characteristics

Let me provide detailed characteristics of Type 4 finish¹.

Production Process

• Start with 2B finish sheet or bar
• Polish with 120-180 grit abrasive belts
• Result: Uniform, directional satin finish

Properties

Property	Value
Appearance	Brushed, satin, grain lines
Reflectivity	Low (non-reflective2)
Roughness (Ra)	0.2-0.5 microns
Grain direction	Pronounced, uniform
Scratch hiding	Good
Cost	Higher than 2B

Applications

• Handrails and balustrades
• Building cladding and facades
• Kitchen equipment (visible surfaces)
• Elevator panels and doors
• Sinks and countertops
• Architectural accents

Advantages

• Hides scratches well
• Non-reflective (reduces glare)
• Professional appearance
• Easy to clean (with the grain)

Disadvantages

• Grain direction must be considered in design
• Higher cost than 2B
• Can trap dirt in grain lines

Grain Direction Considerations

• Directional finish means all surfaces must run the same way
• Fabrication must account for grain orientation
• Welding can disturb the grain pattern

My Experience
For a hotel handrail project, we used No.4 finish 304 round bar and flat bar. The brushed finish looked professional, hid scratches from daily use, and did not reflect glare.

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Conclusion

Stainless steel finishes¹ range from No.1 (dull, industrial) to No.8 (mirror, decorative). 2B is smooth, bright, and most common. No.4 is brushed satin² for architectural use. Choose finish based on appearance, cleanability, and cost requirements.

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