1. Which belt for which step
Knife grinding asks three different things of a belt. Early on you want fast removal and you can lean on the work. After heat treatment the steel is hard and the edge is getting thin, so heat becomes the enemy. At the finishing end you need an even, fine scratch at light pressure. No single grain is best at all three, which is why most makers end up with two or three belt types on the rack.
| Step | Typical grits | What the belt has to do | MOOSEFOS belt |
|---|---|---|---|
| Profiling the blank | 36β60 | Remove steel fast under heavy pressure | WY1599 ceramic (36β120) or PZ633+ zirconia (40β100) |
| Bevels before heat treatment | 60β120 | Keep cutting while you control the grind line | DY528 zirconia (40β120) or WY1599 ceramic |
| Bevels after heat treatment | 60β120 | Cut hard steel without overheating a thin edge | WY1599 ceramic |
| Refining the scratch pattern | 120β400 | Replace the coarse scratch with an even, finer one | WY1531 alumina-zirconia (60β400) |
| Light finishing passes | 100β400 | Fine finish at low pressure | WY1513 alumina-zirconia, soft backing (100β400) |
| Hand sanding after the belts | P400 and finer | Final finish by hand | Eagle AP806 SiC waterproof paper (P60βP10000) |
Zirconia is tough and needs pressure to self-sharpen: lean on it and it keeps cutting; use it with a light touch and it glazes. That makes it good value for profiling and early bevel work, where you can push. Ceramic cuts at low to medium pressure and grinds cool, which is what you want on a hardened blade, where heat at a thin edge can spoil the heat treatment. The full comparison is in zirconia vs ceramic.
What to avoid: a belt that is past its best on hardened steel β a dull belt rubs instead of cutting, and rubbing makes heat. Cheap aluminum oxide belts are fine on wood and handle material but wear quickly on hardened steel. And do not try to finish with a coarse zirconia belt under light pressure; it will glaze rather than cut.
2. A starter grit progression
A question that comes up on knifemaking forums again and again: is 36 / 80 / 120 for stock removal and 220 / 400 for refining a sensible place to start? It is. In our standard grits it looks like this:
- 36 β WY1599 ceramic: profiling and hogging out the bevels
- 80 β WY1599 ceramic, or PZ633+ / DY528 zirconia before heat treatment: shaping the bevels
- 120 β WY1599 ceramic or DY528 zirconia: cleaning up the bevels; ceramic once the blade is hardened
- 240 β WY1531 alumina-zirconia: refining the scratch pattern
- 400 β WY1531 or WY1513: the last belt before hand sanding
You do not need every grit, but each step has to remove all the scratches left by the step before. Jump too far and the deep scratches only show up at the finish, when they are hardest to get out β see sanding belt troubleshooting, section 5. To see how grit relates to the finish you get, use the grit to Ra chart.
3. Can steel and handle material share belts?
Better not. Wood and resin composites leave soft, sticky dust in the belt, and a belt that has gummed up on handle material no longer cuts steel well. Many makers keep a separate, labelled set of belts for handles β often belts that are worn for steel but still cut wood and composites well. If you want a dedicated handle belt, WY1513 is listed for wood as well as steel.
Composite handle materials such as G10 and micarta produce fine dust: use dust extraction and a respirator.
4. Buying 2x72 belts without ordering a case of 25
The other question that keeps coming up is where to get decent 2x72 belts without buying them by the case. The answer from us follows from how we make belts: every belt we ship is made to order. We do not hold fixed stock sizes β each belt is cut and joined to the size you give us β so the minimum depends on the size and grit, not on a box quantity. Tell us which grits you use and roughly how many of each, and we will tell you straight away what is workable.
- Samples: one free sample per grit, courier freight collect β try them on your own grinder first.
- Lead time and price basis: 5 working days production from confirmed order, quoted EXW Tianjin. Freight is a real part of the cost on small orders, so tell us the destination too, and we will say plainly whether a direct order makes sense for you.
- Other knife grinder sizes: 1β³ Γ 30β³ (25 Γ 762 mm) and 2β³ Γ 48β³ (50 Γ 1220 mm) are made the same way β see how to measure and order the right belt.
- Joint: most grinders run one way, so a lap joint mounted by the arrow is fine. If you want belts you can reverse, ask for a butt joint in the inquiry β it is a build decision, not something you can change later.
- Knife supply shops: private label, with your brand on the backing and packaging, from 1,000 meters.
5. Why a belt goes shiny and stops cutting β and other early failures
The belt goes shiny and slides. That is glazing: the grain has rounded over instead of fracturing. Zirconia in particular needs pressure to break down and expose fresh edges; with a light touch it glazes early. Ceramic works at lower pressure, but a feather-light finishing pass can still round it over. Put the pressure where the belt needs it, and do light finishing passes on the finer alumina-zirconia belts instead. A contact wheel that is too soft or a belt that is not tight enough has the same effect β see belt grinder setup.
A new belt sheds grit at the edges. Freshly cut blanks have sharp corners and burrs that can strip grain off a new belt. A common tip among makers: knock the corners off with a used belt first.
The belt opens at the joint. Usually it was fitted against the arrow, over-tensioned, or is catching on the work rest β or it is simply an old belt whose splice adhesive has aged on the shelf. See sanding belt troubleshooting, section 7.
6. Common questions
What are the best 2x72 belts for knife making?
Use different grains for different steps: ceramic or zirconia at 36β60 grit for profiling, zirconia or ceramic at 60β120 for bevels before heat treatment, ceramic for grinding after heat treatment because it cuts at lower pressure and runs cooler, and alumina-zirconia belts from 120 to 400 grit to refine the finish before hand sanding.
What grit progression should a beginner use on a 2x72 grinder?
36, 80 and 120 for stock removal and 240 and 400 for refining is a sensible start. Each grit has to remove all the scratches left by the one before, so do not jump too far between steps.
Can I use the same belts for knife steel and handle material?
It is better not to. Wood and resin composites gum up a belt, and a belt loaded with handle material no longer cuts steel well. Keep a separate set of belts for handles; belts that are worn for steel often still work well on wood and composites.
Can I buy 2x72 belts without ordering a full case?
Every MOOSEFOS belt is made to order, so the minimum depends on size and grit rather than a box quantity. Tell us the grits, quantities and destination and we will tell you what is workable; we also send one free sample per grit, courier freight collect.
Why does my zirconia or ceramic belt go shiny and stop cutting?
It has glazed: the grain rounded over instead of fracturing. Zirconia needs pressure to self-sharpen and glazes under a light touch; ceramic works at lower pressure but can still glaze on very light passes. Use more pressure, check contact wheel hardness and belt tension, and do light finishing passes on finer alumina-zirconia belts.