How to Choose Sanding Pads: the Right Grit

The short answer

Here is the rule that governs nearly every sanding pads decision: match the grit to how much material you are removing, and match the pad type to what the machine does to it. An orbital sander with a hook-and-loop pad removes stock fast and leaves a controlled cross-hatch, so P80 to P120 covers most stock removal, and P180 to P320 covers most blending and prep. A mesh, perforated or solid pad on a die-grinder style spigot wants a lighter cut and a finer step, because the smaller pad footprint puts more pressure on the grain. Two scenarios where the rule bends: very soft woods and soft plastics where even a coarse grit digs deep scratches that the next coat has to fight, and thin sheet work where heat build-up from a coarse grit, held in one spot, can warp the part. If your job is everyday wood, fill or light metal prep, start in the P80 to P120 band and confirm the pad fits your machine's backing plate before you cut into stock. For the full set of formats we supply, see the sanding disc range, which lists the PSA, mesh and non-hole discs, and keep the abrasives glossary open whenever a label term is unfamiliar.

Two habits turn this from guesswork into a repeatable spec: always state the grit standard you are buying to (FEPA or ISO 848), and always confirm the pad's backing, diameter and arbor against the machine before the first pass. Everything below is the reasoning behind those two moves.

How sanding pads actually work

A sanding pad is a coated abrasive with three parts that each do a different job, and the parts trade against one another. The grain cuts, the bond holds the grain in place and lets it abrade in stages, and the backing carries the whole assembly to the machine. Most of the sanding pads you see on the market are built on one of three backings:

Hook-and-loop (PSA / press-on) — a paper or non-woven backing with a hook-and-loop face that sticks to a matching disc on the sander. These are the classic orbital sander pads: fast changeovers, good for volume work, grits that run P60 to P5000 on the discs we carry.
Perforated (mesh / multi-hole) — a paper or film backing cut with open holes, either eight-hole or with a mesh pattern, that fits over a spigot or threaded nose on a grinder or sander. The holes vent dust out of the face, and that is why the perforated pad stays cleaner than a closed face on dusty work.
Holeless (solid) — a solid backing with no centre hole or vents, used where the machine wants a flat, rigid interface and the dust is handled by extraction at the work rather than through the pad.

The grain does the rest of the work. An aluminium oxide grain is the all-rounder on wood, fill and most steel; it is tough, economical and cuts predictably, and the reference for the properties is at the material page on aluminium oxide. A silicon carbide grain is harder and sharper, and it suits soft, slick materials like plastic and some non-ferrous metals that pack a soft grain. The grit band across a range of the discs we supply runs P60 to P5000, which is wide enough to take a part from rough stock all the way to a pre-clear finish, and it is worth noting where the 150 sits in that ladder: it is the middle of the prep-and-blend band, the grit you reach for when the surface has been roughed off and needs to be brought even before a P320 or P400 cleanup. The three backing styles are stocked against specific diameters — 3, 4, 5 and 6 inch PSA, 5 and 6 inch mesh, and the 6 inch non-hole — and you can compare them on the 5-inch PSA sanding disc, 5-inch mesh sanding discs and the 6-inch non-hole sanding disc before you commit a format.

One piece of construction that is not cosmetic: on a perforated or mesh pad, the hole pattern is where dust leaves the face. A pad with good venting keeps the grain open longer on the same job, so its life is more about grit selection and pressure than about how quickly it clogs. A solid pad shifts that problem to the extraction side, which is why the holeless pad is the one that pairs with strong dust extraction at the work.

Grit ladder for everyday jobs 🪜

A short ladder to keep in your head when you walk the floor. The ladder below is the one we use to walk a new buyer through a first order, and each band names what the grit is doing rather than just its number:

P60 – P80 🛠️ — heavy removal: thick paint, old lacquer, rough stock, the jobs where you want real material movement.
P100 – P120 ⚙️ — everyday removal and leveling; the band most furniture and cabinetry work spends its time in.
P150 – P180 📏 — blend and prepare: takes the coarser scratches out and starts bringing the surface into one texture band.
P220 – P320 ✅ — coating prep: a uniform, low scratch before primer or topcoat.
P400 – P600 🎯 — cleanup, de-raising, and the final blend between coats.
P1500 and finer ✨ — polish and de-raise on a surface that is already close; always the last step, never the first.

Two notes on reading the ladder. One: the gaps between the bands are deliberate — work a moving pad that overlaps the previous band, and keep the jumps to no more than one step at a time. Two: a band is where you start, not where you stop. The surface still shows the previous band's scratches until the next band overwrites them, so the finish quality is set by how carefully you work the last two bands, not by the first one.

Choosing by material and finish line

Material moves the starting grit even when the tool is the same, and a finished surface is really a sequence of grits, not one grit. The table below is a starting point, not a rule — the thickness of the stock and the finish you are aiming for both pull the sequence in one direction or the other.

Soft wood (pine, balsa, MDF-style) 🪵 — P120 to P180 to remove, P220 to P320 to bring even. Soft material loads a fine pad fast, so a coarser grit with a moving pad beats a fine grit held in one spot.
Hard wood (oak, ash, maple) 🌳 — P80 to P120 to remove, P180 to P240 to prepare, P320 to P400 to clean. This is the bread-and-butter furniture sequence, and it is the one that shows up most in a woodworking shop that runs a random orbital.
Paint and lacquer removal 🎨 — P80 to P120 to knock down, then P180 to P320 to open the surface for re-coating. If the old finish is thick, add a P60 first pass; if it is a thin film, a P120 straight in is often enough.
Metal fill and putty 🔩 — P150 to P180 to level, P240 to P320 to blend, P400 before topcoat. Fills take a fine grit better than wood does, and a P400 pass before the topcoat is where most of the finish quality is won.
Final pre-clear and pre-paint cleanup ✅ — P400 to P600 to de-raise, and P1500 where you are polishing rather than digging. A P1500 pad on a surface that still has P120 scratches will glaze instead of cut, so it is always the last step, never the first.

A worked example to keep the sequence honest: a softwood panel that comes in with old varnish and two or three coats of paint. First pass, a hook-and-loop P80 on the orbital to remove the old finish and even out the top of the grain; second pass, P120 to take the P80 scratches; third pass, P180 to bring the whole panel into one texture band; fourth pass, P320 to clean up before a primer and topcoat. The rule underneath the example is always the same: keep every layer of scratch finer than the one before it. The moment you jump two steps, the coarser scratches survive under the next coat and show through. For the wood side of these jobs, the woodworking sanding use notes walk through typical sequences by wood type, and the full pad set is visible in the sanding disc range, which is where you confirm which grit is stocked against which format before you order.

One material care point that is not a grit point but shows up like one: when you move from a steel job to a stainless or a cleaner wood, swap the pad. Embedded steel particles in a grain that looks used are the seed of rust spots on the next surface, and a shop that runs both usually keeps one pad dedicated to each material.

Speed, dust and safety, in plain terms

Sanding pad work is a dust hazard more than a flying-chip hazard, and the honest message is that compliant use lowers the risk rather than removing it. A few practices do most of the work. Confirm the pad's rated speed against the machine before the first pass — a random orbital runs on a low-RPM, orbiting head, and a spigot or die-grinder style nose runs faster and wants a lighter cut; if you are not sure, confirm the rated speed with sales and keep the tool below it. Keep the backing and arbor the right size for the machine, and never run a pad on a tool it was not made for. Wear eye and face protection, and on dry sanding with heavy dust, use dust extraction at the work and the right respiratory protection for the load. The U.S. PPE general requirements are a good starting point at OSHA 29 CFR 1910.132, and a practical reading of how to set up and use abrasive wheels and discs is at CCOHS: Abrasive Wheels.

Dust is worth its own line, because it is the part people under-plan most. A sanding pad throws fine dust that is easily breathed in and easily tracked around the shop. Three things that help: a dust extractor with the right filter for the material, the extractor actually running at the work, and a store bin or bag for the waste that is not just swept to the corner. On materials that can produce silica — some mineral plasters, some old paint, some stucco — dust control has to be taken more seriously, because that is the hazard that turns a routine sanding task into a long-term exposure. The dust topic is covered plainly at abrasive dust and airborne particulates.

Two failure modes deserve their own line. A pad used past its speed rating can separate at the face; a pad seated on a mismatched backing or spigot can walk and catch. Both are preventable, and both start at the label. So make the habit: read the pad, read the tool, and only then start the job.

Machine fit: pad to tool

Pad choice is only half the job; the other half is making sure the pad actually fits the tool and the tool is happy with it. Three things have to line up before the first pass, and most of the complaints that look like a grit problem are really a fit problem.

Diameter and backing plate. The pad diameter has to match the sander's backing plate, not just be close. A hook-and-loop pad wants a PSA disc that the sander is made for, and the pad size is what the disc is sized to. A pad that is a size too big will hang off the plate and dig unevenly; one a size too small will not use the full stroke.
Spigot and nose on the perforated and mesh pads. A perforated or mesh pad fits over a spigot or threaded nose, and the centre hole has to clear that nose with the right clearance. Too tight and the pad cannot spin true; too loose and it wobbles. The nose type and the spigot thread are the two numbers to confirm against the tool before you order.
The non-hole pad and its interface. A holeless, solid pad sits on a flat interface and needs a matching flat back, because there is no centre hole to centre it on. That is also why the solid pad wants strong extraction — the dust has nowhere to go but out of the face, and the face is what you are sanding with.

The working speed is the number that really protects the operator on a pad. Every pad has a maximum working speed, and the tool must not be allowed to spin past it. Because surface speed rises with both diameter and RPM, a larger pad on the same machine reaches a higher surface speed than a smaller one, which is why the same orbital can be fine with a 5 inch pad and too fast with a 6 inch one. If you are not sure, run the machine at no load, measure the speed, and keep the pad below its printed maximum — or confirm the rated speed with sales against the specific pad and the specific tool. A quick sanity check before you spend money on the wrong size:

Pad diameter and backing plate are the same size.
Spigot or nose fits the pad centre with the right clearance, or the pad is a true non-hole on a matching flat interface.
No-load tool speed is at or below the pad maximum working speed.
Guard or backing plate is the correct size for the pad, fitted and held in place.

When the cut changes

A pad that suddenly cuts less, or cuts with a different texture than before, is usually one of a handful of things, and each has a different fix. The five below cover most of the shop floor:

Pressure, not grit. Pressing into a pad makes it load and glaze, which is the opposite of cutting more. If the cut dropped the moment you leaned in, the fix is lighter pressure and a moving pad, not a coarser grit.
Grain too soft for the material. A grain that is as soft as the workpiece packs and stops. Move to a tougher grain, like silicon carbide on soft slick materials that load aluminium oxide.
Wrong pad type for the tool. A hook-and-loop pad on a high-speed spigot, or a solid pad where the tool wants a vented one, puts the backing against the job before the grit does; the backing limits the cut before the grit does.
Tool speed too low. A pad wants to move. Below the speed it was made for it cuts soft and slow; check the no-load speed and keep the pad in the band it was designed for.
Grit too fine for the job. A fine grit on a coarse task asks the pad to polish instead of remove. Step down a grit and the cut comes back.

For each of these, the sanding disc range shows the grit and backing to reach for, the woodworking sanding use notes give the sequence by wood, and the automotive repair sanding use notes cover the fill-and-primer side. The thread running through all five is that under-cutting is almost always a match problem, not a bad pad; fix the grit, the grain, the pad type or the speed, and the cut returns.

Reading FEPA and ANSI grit numbers

The grit number is only meaningful when you name the scale, and that is where two suppliers quietly end up shipping you two different pads. FEPA (ISO 848) numbers and the older ANSI numbers do not always line up, so a P120 and a 120 grit can be different grain sizes even though the label looks identical. When you buy sanding pads from more than one source, state the scale in every enquiry and ask which one the stock is on; the reference is at the FEPA grit standard, and the broader set of standards sits under ISO standards.

The practical reason it matters is that a wrong scale gives you the wrong cut. If you think you are buying P240 to blend and the supplier is quoting on a coarser ANSI 240, you will arrive at the bench with a grit that removes more than you planned and the surface will show it. Two moves prevent it: always name the standard (FEPA or ISO 848), and keep your shop to one scale so the grits on your shelves are comparable. For a bulk or branded order, the scale is a field on the spec sheet, not a footnote, which is why it is one of the things the request a quotation form asks for.

A worked example: a drawer side in oak

Because worked examples are where grit choices stop being theory, here is one a shop we work with runs every week. The part is a solid oak drawer side, roughly 15 mm thick, coming off the table saw with saw marks and a light burr on one edge, aimed at a hand-sanded, oiled finish. The machine is a 5 inch random orbital, and the pads are hook-and-loop, because the job is panel work and changeover speed matters more than maximum material removal.

P80, short pass to take the saw marks off the wide face and square up the edges. This is a removal pass, so pressure is allowed and the pad is held moving; the goal is even thickness, not a clean surface.
P120 to even out the whole face so the P80 scratches are gone everywhere, including the edges, which is where most panels keep a coarse mark hidden in the corner.
P180 to bring the face and the edges into one texture band. On an oiled finish this band is what you will see most, so it is the pass worth doing carefully rather than fast.
P320 for the final cleanup before the oil goes on. If the oil is a deep, dark shade, a P400 pass over the high points keeps the sheen even, because a P320 scratch line reads as a light line in dark oil.

Two things about the example that hold up for the whole category. First, the burr on the sawn edge never needed a dedicated edge pad: the same panel grits, held square to the edge on the last two passes, took it off cleanly. Second, the finish quality was set entirely by the P180 and P320 passes, not the P80, which is the same rule as keeping every scratch finer than the one before it. For the sequences by wood type, the woodworking sanding use notes are the place to check before you commit a grit run, and the request a quotation page is where to confirm the P80 to P320 set is stocked in 5 inch hook-and-loop.

What P1500 does, and where it does not

Because P1500 and the fine end of the range come up in so many enquiries, it is worth treating it on its own. P1500 is a fine grit, and its whole job is to de-raise a surface rather than remove stock. That means it is the pad you run after the heavier work is done, not the one you start with. Use P1500 to open up a surface that has micro scratches, to soften the marks a P400 left behind, and to bring a part to a state where a clear coat or a fine film will sit evenly. A lot of its value is that it keeps the whole surface in one band of texture instead of leaving deep scratches the next coat has to fight.

Where P1500 does not belong is as a first pass. If you start on P1500 over coarse scratches or raw filler, you are asking a fine pad to do a coarse pad's job, and it will glaze and load instead of cutting. P1500 rewards a clean hand over it, light pressure and a moving pad; pressing into it is the opposite of what it wants, because the fine grain skims rather than digs. If you only have one fine pad and you are unsure, P400 does more of the real prep and P1500 is the polish on top. The fine end of the range, including what P1500 pairs with, is visible in the sanding disc range, and the request a quotation page is where you confirm P1500 is stocked against your pad type and diameter.

Cost, life and lead time

On cost, people usually buy the cheapest pad per unit and end up paying for it in machine time. A pad that keeps its grain open and cuts evenly runs more per unit than one that loads fast, so the cost per finished surface is often lower on a good grade than on a cheap one, and the difference shows up in how many panels you get between pad changes. For a job with steady volume, the wear rate and the cost per finished surface matter more than the sticker price, which is the core idea behind buying sanding pads in bulk rather than a handful at retail.

A useful way to compare two pads you are choosing between is cost per finished surface, not cost per pad. If pad A costs more but lasts several times as long over the same job, the finished surface is cheaper on A. That is the number to ask a supplier to help you with, and it is the number a bulk conversation should be built around, because at volume the per-surface cost is where the saving actually lands. You can see the bulk and retail formats side by side in the sanding disc range, and the hook-and-loop sanding discs page is where to confirm which PSA grades are stocked against which diameter.

On lead time, two things set it. In stock grits and common formats ship fast; off-grade grits or a backing you do not hold in the same run take longer because the grain, the bond and the backing all have to line up. For OEM or private label work, add time for the label, the packing and any spec sheet you want on the box. If you are planning a regular order or a branded run, the request a quotation page is where to start, and the OEM & private-label service page explains what we can put on the packaging and how minimum order quantities work — confirm the MOQ and the lead time with sales before you commit a run.

Pad life is where the three backings pull apart most. A hook-and-loop pad on an aggressive job runs down the grain first, and that is normal; the grain is the wearing part and the backing is what carries it. A perforated pad on a dusty job can either outlive the grain because the holes vent it, or clog faster than the grain wears because the dust packs between the holes — so that style wants a cleaner, moving pass more than a pressed one. A holeless pad on a high-speed spigot is more likely to heat and flex, so its life is limited by how hot the job runs rather than how hard you press. The practical read: if your life is short and the pad feels like it is running hot or clogging, you are probably on the wrong backing for the speed, not the wrong grit.

Common mistakes and how to fix them 🛠️

The fixes are usually cheaper than the mistake. Here is what shows up most often, with the fix that actually moves the problem:

Skipping grits. Going from P80 straight to P320 leaves P80 scratches under the finish; add the P120 and P180 steps and the surface clears.
Pressing into the pad. Pressing makes the grain load and glaze, which is the opposite of cutting more. If the cut dropped when you leaned in, the fix is lighter pressure and a moving pad, not a coarser grit.
Grain too soft for the material. A grain that is as soft as the workpiece packs and stops. Move to a tougher grain — silicon carbide on soft, slick materials that load aluminium oxide.
Wrong pad type for the tool. Running a hook-and-loop pad on a high-speed spigot, or a solid pad where the tool wants a perforated vented one, puts the backing against the job before the grit does; match the pad to the machine first, then the grit to the cut.
Holeless pad without extraction. A holeless pad shifts the dust problem to the room, so without extraction at the work the dust just tracks around the shop and the grain clogs faster; add extraction before you add pressure.
Heat on a thin part. A coarse grit on thin sheet or thin veneer builds heat that warps the part; drop a grit and keep the pad moving rather than pressing in.

For any of these, the sanding disc range shows the grit and backing to reach for, the woodworking sanding use notes give the sequence by wood type, and the automotive repair sanding use notes cover the fill-and-primer side of the job. The thread that runs through all six is that under-cutting and over-sanding are almost always a match problem, not a bad pad; fix the grit, grain, pad type or speed, and the cut returns.

How to spec a bulk or private-label order 🏷️

When you move from buying a handful of sanding pads to a bulk or private-label run, the conversation shifts from grit to a spec sheet. The fields that make or break an order are the ones below, and they are exactly what the OEM & private-label service page walks through in more detail.

Grain and grit — the grain (aluminium oxide, silicon carbide, or a tougher grain where the material packs) and the FEPA or ISO 848 grit, stated on the same scale you shop to, so a 150 means 150 and not a coarser number from another scale.
Pad type and diameter — hook-and-loop, perforated or holeless, and the 3, 4, 5 or 6 inch size the machine wants, because the backing has to match the machine, not just the grit.
Backing and fit — the backing material and the arbor or spigot fit, confirmed against the machine before the first order.
Label and packing — your logo, your part code and any spec sheet you want on the box for a private-label run.
Quantity and lead time — the order quantity and how fast it needs to be on the shelf, which sets whether it ships from stock or gets made to your run.

Send those five fields and the order is a conversation instead of a gamble. The request a quotation page is where to start, and if you are new to a branded run, ask for a sample against the spec before the full order so the grit, the pad type and the label all match what you expect.

FAQ

What grit do I start with on a random orbital for furniture? In many cases P80 to P120 covers everyday stock removal on hard wood, and P120 to P180 covers soft wood. Start coarse, work down one grit at a time, and never jump two steps at a time.

Perforated pad or a closed-face pad — which one for a dusty job? The perforated side vents dust through the face, so it is the stronger choice where you are dry-sanding and the dust is heavy; a closed-face pad wants extraction at the work instead. Pick the perforated one for the messier job and the closed face where the extraction is set up properly.

What does "5-inch mesh" mean on the mesh sanding discs? It is a 5 inch pad cut with a mesh pattern, which is the fine multi-hole venting you see on the 5-inch mesh sanding discs page. The mesh is the venting, and the 5 inch is the pad diameter.

Does the grit go fine enough on the hook-and-loop discs? The PSA discs we carry run P60 to P5000, which takes a part from rough stock to a very fine pre-clear finish. If your finish spec needs something finer than the stocked range, confirm with sales before you order, because the fine end is the one that is not always in the standard run.

Is P60 too coarse for a softwood finish prep? On soft wood, P60 digs deeper than you want for a finish that has to be smooth; P80 to P120 is the band that removes without over-scratching. P60 earns its place on thick paint, old lacquer or heavy stock, where the deeper scratch is what you are trying to take off.

How do I buy sanding pads in bulk? Send the grain, the grit standard (FEPA or ISO 848), the pad type, the diameter and the quantity; the request a quotation form is where a bulk or branded order starts, and the hook-and-loop sanding discs page shows which PSA grades are stocked against each diameter.

What standard should I name in an enquiry? Name FEPA or ISO 848 grit plus the pad type and diameter; that keeps your order from being mixed with a different grit scale. The reference is at the FEPA grit standard, and the abrasives glossary keeps the terms straight so you and your team are diagnosing the same problem.

Before you buy

A short compliance and purchasing checklist. This is a reminder, not a substitute for your own site rules, and in compliant use with the right protection the risk of these tools is reduced but not zero.

Confirm the machine's rated speed is below the pad's rated speed before every use; if the number is not printed, confirm it with sales against the specific pad and keep the tool below it.
Check the backing, arbor or spigot fit and the pad diameter match the machine, and use the right backing for the pad type — a hook-and-loop pad wants a matching PSA disc, a perforated pad wants a matching spigot.
Fit and keep the machine's guard or backing plate correct for the pad, and do not run a pad on a tool it was not made for.
Wear eye and face protection, and use dust extraction at the work with the right respiratory protection for the dust load, especially on dry sanding and on materials that can produce silica.
Name the grit standard (FEPA or ISO 848) and the pad type in every order, so the grit and the format do not get mixed with a different scale or a different backing.
Check the certificate or inspection report for any branded or OEM run you are buying, and follow the maker's install notes for how the pad is meant to be fitted and changed.
Keep the pads stored dry and away from heat, and note how they travel — a soft grain in a hot, damp store loses life before it ever reaches the machine.
Confirm lead time, minimum order and packing for any bulk or private-label order, and start with the quotation form.

If you tell us the material, the finish you are aiming for and the machine you run, we can help you pick the grit and the pad type to start from. Send the three and we will work the sequence with you on the request a quotation page.