HOW TO CHOOSE FIBER DISC GRIT

Hello every friends.Today i will introduction:How to select the grit in different situations to enhance grinding efficiency and save usage costs

Choosing the right fiber disc grit is critical — it directly affects cutting speed, surface finish, cost, and customer satisfaction. Most buyers choose wrong here, so if you understand this well, it’s a strong selling advantage.

What does “grit” mean?

Grit = the size of abrasive particles on the disc.

• Lower number (24, 36) → larger grains → more aggressive

• Higher number (80, 120) → smaller grains → smoother finish

Quick Grit Selection Guide

1. Heavy material removal (Grinding / Weld removal)

• Grit: 24 / 36

• Use for:

• Weld seam removal

• Edge grinding

• Heavy rust removal

 Fastest cutting, rough finish

2. General purpose grinding

• Grit: 40 / 60

• Use for:

• Surface leveling

• Light weld blending

• Preparation before coating

 Best balance between speed and finish (most commonly used)

3. Surface preparation / light finishing

• Grit: 80

• Use for:

• Paint removal

• Surface cleaning

• Pre-polishing

 Smoother surface, less aggressive

4. Fine finishing

• Grit: 100 / 120+

• Use for:

• Final finishing

• Stainless steel surface work

• Decorative applications

 Very smooth, low removal rate

Simple Rule (Easy to Remember)

Rough work → low grit (24–36)

General work → medium grit (40–60)

Finishing → high grit (80–120)

Material-Based Recommendation

Carbon Steel

• 24–36 → weld removal

• 40–60 → general grinding

Stainless Steel

• 40–60 → grinding

• 80–120 → finishing

 Prefer ceramic or zirconia to reduce heat

Aluminum / Soft Metal

• 40–80

 Use anti-loading discs (important)and avoid overly coarse grit (use 40# – 80#) to prevent grit embedment; finish with fine/very fine grit.

Efficiency vs Cost Insight

This is where many buyers make mistakes:

• Using too fine grit for heavy work → very slow, high labor cost

• Using too coarse grit for finishing → rework needed

The cheapest disc is not the lowest price — it’s the one that finishes the job fastest with least steps.

Common Mistakes to Avoid

❌ One grit for all jobs

❌ Choosing based only on price

❌ Ignoring material type

❌ Skipping grit sequence

 At the end of the article, I have summarized a table based on different abrasive materials and grit sizes for your reference.