18" x 85" Sanding Belt, 3 PACK
18" x 85" Sanding Belt, 3 PACK
Available in stock (49999)
An 18-inch wide belt sander is the workhorse of a lot of small production shops: wide enough for cabinet doors and cutting boards, small enough to run on single-phase power. These closed-coat aluminum oxide belts on X-weight poly-cotton cloth are cut to 18" x 85" and sold three to a pack in a single grit, so you can keep a full progression on the shelf.
The grit range runs from 36 for calibrating rough or glued-up stock to 320 for a final pass on veneer and clear-coat work. Aluminum oxide is the right grain for the wood, MDF and occasional aluminum these machines see; it cuts at moderate pressure and gives an even scratch that stains uniformly. We convert them in Anaheim, California, and can cut other lengths to order.
- Closed-coat aluminum oxide on X-weight poly-cotton cloth built for wide belt sander tension
- Nine grits from 36 to 320 cover calibrating, dimensioning, surfacing and final finishing
- 3-pack in one grit: a working belt plus two spares for the grit you change most
- Cloth backing runs wood, MDF, plywood, aluminum and composites dry
- Resists loading with proper dust extraction; cleans with a crepe belt eraser
- Custom lengths, including 86 inches for machines that call for it, made in about 3 days
Which grit should you choose for an 18-inch wide belt sander?
This listing is A/O - Aluminum Oxide only. An older version of this page described zirconia and ceramic as options; they are not stocked in 18" x 85" but can be converted as a custom order for shops sanding steel. For wood, aluminum oxide is the grain we recommend regardless. Pick the grit by the job the belt will do on the machine.
- 36 grit: calibrating. Rough-sawn boards, glued-up panels that are out of flat, and thick removal. Contact drum, light passes.
- 60 grit: dimensioning and glue-line removal after 36, or the first belt on panels that are close to flat.
- 80 and 100 grit: general surfacing. 80 is the most common first belt on planed stock and the belt most shops go through fastest.
- 120 and 150 grit: pre-finish. 120 is the finishing grit for paint-grade MDF and primer-ready plywood.
- 180 and 220 grit: last pass on hardwood before stain or clear. Use the platen if your machine has one. Stop at 220 for stained work.
- 320 grit: a light final pass on veneer, figured wood and pieces that will be oiled or clear-coated, and a fine finishing belt for aluminum and brass.
Grit guide: calibrating versus finishing on a wide belt
| Grit | Use it for | Notes |
|---|---|---|
| 36 | Calibrating rough stock to thickness | Contact drum; 1/64–1/32 in per pass |
| 60 | Dimensioning, glue lines | Follow 36; do not jump to 120 |
| 80–100 | General surfacing | First belt on planed stock |
| 120–150 | Pre-finish, paint-grade panels | Less than 1/64 in per pass |
| 180–220 | Final before stain or clear | Platen head if available |
| 320 | Veneer, oil and clear finishes | Skim pass only; burnishes under stain |
What machines take an 18" x 85" belt?
- 18-inch wide belt sanders in the small-shop and light-production class, single-head machines used for doors, drawer fronts, cutting boards and panels up to 18 inches wide.
- 18-inch machines that call for an 86-inch belt. Most wide belt sanders accept about plus or minus 1/4 inch of length, but a full inch is outside that range. If your manual says 86 inches, order our 18" x 86" belts instead of stretching an 85.
Mounting: release tension, slide the belt on with the grain out, tension it, and set tracking with the oscillation running so the belt swings evenly across the drum. Check the inside of the belt for a direction arrow before you mount it; if one is printed, run the belt that way so the joint trails. If your machine takes a length or width not shown on the site, we convert custom belt sizes in about 3 days.
How to get the most out of it
- Calibrate on the drum, finish on the platen. The contact drum removes stock at 36 to 60 grit; the platen, if your machine has one, gives the flat, scratch-free surface at 150 grit and finer.
- Keep passes shallow. 1/64 to 1/32 inch per pass at 36 to 60 grit on hardwood, less as the grit gets finer. Deep passes on an 18-inch machine bog the motor and burn the belt.
- Keep the feed moving. A slow feed is the most common cause of burning on cherry and maple. If you see brown streaks, speed up the feed before you raise the table.
- Step grits one at a time. 36, 60, 80, 120, 180, 220. Skipping more than one grade leaves scratches from the coarse belt under a surface that looks finished.
- Run the dust collector at full draw. Loading is what shortens wide belt life, and an 18-inch belt has less surface to spread dust across than a 43-inch belt.
- Clean before you swap. Hold a crepe-rubber belt eraser lightly against the running belt to pull dust and resin out of the grain. A glazed AO belt is usually a loaded AO belt.
- Stagger your panels across the belt width so the belt wears evenly instead of in a track the width of your work.
- Store spares hanging, away from humidity and sunlight, and let a cold belt warm up before running it. Cloth belts that sit folded take a set that thumps on the drum.
Use it for / don't use it for
Use it for
- Calibrating and finishing cabinet doors, drawer fronts and face frames
- Thickness-sanding cutting boards, glued-up panels and tabletop sections up to 18 inches wide
- Surfacing MDF and plywood for paint and primer
- Skim-sanding veneered panels at 150 grit and finer
- Light finishing of aluminum, brass and composite sheet
Don't use it for
- Steel plate and weld knockdown as a regular job; that is a zirconia belt, available as a custom size
- Wet sanding; these are dry-use belts
- Running a belt with a lifted joint or a frayed edge
- Finishing finer than 220 on wood that will be stained
- Machines that specify an 86-inch belt; order the 18" x 86" instead
Specifications
| Size | 18" wide x 85" long |
|---|---|
| Abrasive grain | A/O - Aluminum Oxide |
| Backing | X-weight poly-cotton cloth |
| Coat | Closed coat |
| Joint | Check inside of belt for a direction arrow before mounting |
| Grits offered | 36, 60, 80, 100, 120, 150, 180, 220, 320 |
| Pack quantity | 3 belts, one grit per pack |
| Wet or dry | Dry |
| Machine type | 18-inch wide belt sanders |
| Converted in | Anaheim, California |
| Custom sizes | Made to order in about 3 days |
Frequently asked questions
My manual says 18" x 86". Will an 18" x 85" belt work?
We do not recommend it. Most wide belt sanders tolerate about a quarter inch of length either way, and a full inch short may not tension or track correctly. We stock 18" x 86" belts as a separate listing, and we can convert any other length to order in about 3 days.
Do you still offer zirconia or ceramic in 18" x 85"?
Not as a stocked item; every belt on this page is closed-coat aluminum oxide. Zirconia and ceramic belts are made for steel and stainless under heavy pressure, and on wood they tend to tear fibres and burn. If your 18-inch machine runs metal, call 714-646-3299 and we will quote a custom zirconia run.
What is the difference between X-weight and Y-weight backing?
Both are poly-cotton cloth. X-weight is the standard heavy cloth for wide belt sanders: stiff enough to run flat over a drum and platen without stretching, flexible enough to track. Y-weight is heavier and stiffer, used for high-pressure grinding belts. These 18" x 85" belts are X-weight, which is correct for wood and light metal.
Which grit should I calibrate with and which should I finish with?
Calibrate rough or glued-up stock at 36 or 60 grit on the contact drum, taking no more than 1/32 inch per pass. Surface at 80 to 120, then finish at 180 or 220 for stain-grade work. Use 320 only for a skim pass on veneer or pieces that will be clear-coated or oiled.
Why is the belt burning the wood?
On a wide belt sander burning comes from a slow feed, too deep a pass, a loaded belt or a dull belt, in that order. Speed the feed up, take less per pass, and clean the belt with a crepe eraser. Cherry and maple show burn first, so start your troubleshooting on those species.
How many belts are in a pack, and can I mix grits?
Each pack has three 18" x 85" belts of the same grit. Order one pack per grit for the progression you run, typically 80, 120 and 180 for cabinet work. Orders over $200 ship free, unused belts in original packaging can be returned within 30 days, and case pricing is available by phone or email.
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