CGW 42352 is the 4-1/2-inch, 40-grit, 5/8-11 threaded version of the Z3 zirconia Type 27 XL flap disc. Arc Weld lists it as a pack of ten. If that is the item on your reorder sheet, match all those details before buying. A similar-looking CGW disc with another last digit can have a different grit, mount or diameter.
This is an ordering and identification guide, not a hands-on review or approval for a particular grinder. The specifications below come from CGW’s 2026 product catalog; the selling unit comes from the current Arc Weld listing. Your grinder manual, the actual disc label and the job requirements still govern use.
The exact 42352 specification
- Manufacturer part number: 42352.
- Product family: Z3 zirconia, Type 27, XL.
- Nominal diameter: 4-1/2 inches.
- Mount: 5/8-11.
- Abrasive grade: 40 grit.
- Catalog speed rating: 13,300 RPM.
- Manufacturer box quantity: 10; Arc Weld selling unit: pack of ten.
CGW places this number in its Type 27 XL table. Keep the family and type on the purchase request instead of shortening the description to “four-and-a-half-inch flap discs.” That shorthand leaves out the mount, grit and construction you are trying to reorder. It also makes a substitute easier to accept without noticing the difference.
Do not confuse a threaded mount with a plain arbor hole
The 5/8-11 designation identifies the threaded configuration in this catalog row. It is not the same catalog option as a 7/8-inch hole. A grinder’s advertised disc diameter does not settle the mounting question. Before ordering, compare the grinder’s specified attachment system, guard requirements and approved accessory types with the exact disc.
Keep an old packaging label or a clear record of the approved consumable rather than relying on an image alone. If the spindle, attachment or guard arrangement is uncertain, resolve it with the tool manufacturer before purchasing. Do not treat an adapter, a similar thread or a successful test fit as evidence of approval.
Use the part number to catch near-matches
The manufacturer’s table makes several useful distinctions. CGW 42342 is also a 4-1/2-inch, 40-grit Type 27 XL disc, but its mount is listed as 7/8 inch. CGW 42354 keeps the 4-1/2-inch and 5/8-11 configuration but changes to 60 grit. CGW 42552 keeps 40 grit and 5/8-11 but changes the diameter to 5 inches. These are identification comparisons, not recommended substitutions.
That is why the last digits matter. Write the complete 42352 number alongside the dimensional description. If a quote returns another number, ask what changed before approving it. Do not assume the supplier has simply used a newer name for the same item.
Separate a speed rating from a recommended setting
CGW’s 13,300-RPM entry is a product rating, not an instruction to run every grinder at that speed. Check the actual accessory label and the tool documentation. The grinder must be approved for the accessory configuration and must not exceed the accessory’s permitted speed. An otherwise matching diameter and thread do not make an overspeed combination acceptable.
This guide does not prescribe grinding angles, pressure, material removal or a weld-repair procedure. Those depend on the manufacturer’s instructions and the work. In particular, buying a 40-grit disc does not authorize removing weld metal beyond the drawing or inspection requirements. Identify the required surface condition before choosing an abrasive for the job.
Confirm the order quantity before checkout
Arc Weld’s SKU is 42352 – PK of 10. For this listing, order quantity one means one pack of ten discs, not one individual disc. Compare quotes using the same selling unit. A lower displayed price on another listing is not a like-for-like comparison until its quantity, exact manufacturer part number and configuration are confirmed.
The connected catalog was checked during preparation of this guide. Availability can change, so the article deliberately does not promise an inventory count, price or delivery date. Check the current listing and your required delivery arrangements before committing to an order.
Check the exact CGW 42352 ten-pack at Arc Weld. Keep the part number and pack size in view when reviewing the cart.
A short receiving checklist
- Match the received package to CGW 42352 and the ordered ten-pack.
- Check the label for diameter, mount, grit, type and speed rating rather than accepting color or appearance as identification.
- Resolve any label, quantity or specification difference before issuing the discs to the shop.
- Follow the manufacturer’s storage, inspection, PPE and tool instructions. This ordering guide does not replace them.
Sources and related WSP reading
Primary specification source: CGW 2026 Product Catalog, Z3 Zirconia Flap Discs, Type 27 XL table. The 42352 row and nearby comparison rows support the dimensions, grits, mount designations, ratings and box quantities used here. Arc Weld’s exact product listing supports the seller’s pack description.
For broader context, see WSP’s flap-disc grit selection guide. The separate CGW 42554 guide concerns a different diameter and grit; it is not a compatibility approval for 42352.
For the craft and culture beyond the consumables order, explore Arc Life.
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