Abrasives are where weld quality gets judged. If you are blending small welds, cleaning tight corners, or finishing parts that are too small for a full-size 4-1/2″ disc, a 2″ flap disc is a practical option. The Norton 90168 is listed as a Type 27 flap disc, 2″ diameter, 80 grit, “Bluefire,” sold as a 3-pack—aimed at controlled blending rather than aggressive stock removal.
Key Takeaways
- 2″ flap discs are built for access: corners, small parts, and touch-up where larger discs are clumsy.
- 80 grit is typically a blend/finish step after heavier grinding (exact progression depends on your finish target).
- Type 27 discs are commonly used at a shallow angle for controlled removal (verify tool and disc ratings).
- Always match disc size and max RPM to the tool you are running.
Performance & Use
This disc size is most useful when you are trying to avoid over-grinding. Think: cleaning a tack area, blending a small fillet, knocking down a sharp edge, or prepping a weld zone on thin material where heat and gouging matter. The “Bluefire” naming suggests a zirconia alumina abrasive per the product page text, but exact abrasive spec should be confirmed against Norton documentation.
What to compare before you buy
- Disc diameter and access: 2″ is for tight work; it is not a replacement for a 4-1/2″ when you need coverage.
- Grit: 80 grit is usually not a first-step weld removal grit. If you need to flatten a proud weld fast, start coarser, then step to 80.
- Type and angle: Type 27 is typically used at a shallow angle; confirm your technique and guard setup.
- Tool compatibility: Confirm arbor/attachment style and max RPM rating for your tool (Unknown (Verify) on the ArcWeld.store page).
- Material match: Verify whether this abrasive is recommended for carbon steel vs stainless applications (Unknown (Verify)).
Durability & Build
Flap disc life depends on pressure, angle, and heat. Small discs can be burned up quickly if you lean on them like a grinding wheel. Use light-to-moderate pressure, keep the disc moving, and let the abrasive cut. If you are seeing glazing, you are likely too hot, too much pressure, or on the wrong material.
Power / Specs
From the ArcWeld.store product page text:
- Product: Norton 90168 flap disc
- Disc type: Type 27 (listed)
- Disc diameter: 2 in (listed)
- Grit: 80 (listed)
- Abrasive material: Zirconia alumina (listed)
- Pack size: Pack of (3) (listed)
- Max RPM: Unknown (Verify)
- Arbor/attachment details: Unknown (Verify)
Who It’s For
- Fabricators doing small-part cleanup, corner blending, and touch-up where a full-size disc is too aggressive.
- Anyone building a grit progression for finish prep (coarse removal → blend → surface conditioning).
- Shops that want a small-disc option for controlled removal on brackets, tabs, and tight assemblies.
Quick FAQ
Q: Is 80 grit enough to remove a weld fast?
A: Usually it is a blending grit, not a heavy removal grit. If you need to flatten a weld, start coarser, then step to 80 for cleanup.
Q: Can I run this on any grinder?
A: Unknown (Verify). You must match disc size, attachment method, and max RPM rating to the tool.
Q: Is this for steel or stainless?
A: Unknown (Verify). Check Norton’s abrasive recommendations for the material you are working on.
Safety Notes
- Abrasives can fail if oversped or used with the wrong guard setup. Confirm max RPM and tool compatibility before use.
- Wear eye and face protection; flap discs throw grit and wire-like debris from the work surface.
- Keep sparks away from flammables and compressed gas cylinders.
- Let the disc cut—excess pressure increases heat and can damage the workpiece and the disc.
Always follow the manufacturer’s instructions and your shop’s safety procedures. If you’re unsure about fitment or ratings, verify before you buy or install.
