Bulk used ASIC miners: lots, pallets, and what every grade actually means

We sell used ASIC miners in bulk — Antminer S19 lots by the pallet — and the part of that sentence worth arguing about is “used”. Second-hand hardware is where the price per terahash is, and it is also where a seller can quietly cost you a five-figure mistake. So this page leads with the part most wholesale pages bury: exactly how a batch is tested, what each condition word means in plain English, what happens when a machine in your lot arrives dead, and what our warranty does not cover. The stock, the freight and the quote form come after that, because they are the easy part.

We are ING Mining LLC, a US company in Hanson, Massachusetts. We buy, bench-test, repair, host and resell this hardware ourselves — which is why we can tell you what was replaced on a specific lot, and why we will tell you when we do not know.

What is on the shelf in bulk right now

11 lots on the shelf as this page loaded - 650 machines in total, in lot sizes from 5 to 300. That is what is listed today, not what we can source: quantities and model mixes that are not on this table are the normal case rather than the exception, and they are what the quote form below is for.

These prices are not a volume-discount ladder and this page will not present them as one. Each lot is priced against what we paid for that batch, so per machine they do not descend neatly with quantity - compare the two or three you are actually choosing between rather than reading a trend into the column. Single machines from the same stock are on the used and refurbished shelf, and everything we sell is in one place.

There is no published minimum order quantity on this store, and we are not going to invent one to look bigger than we are. The smallest lot listed above is what we happen to have listed; if you want six machines, or eighty, or a mixed pallet of S19s and S19k Pros, that is a normal request and it goes through the quote form at the bottom of this page. If you want one machine to test our grading before you commit to forty — which is what we would do — the used and refurbished shelf sells singles out of the same stock.

How a used batch is tested and graded

This is the section that should decide whether you buy from us, so it is the longest one on the page.

There is no industry standard for ASIC grading. No body defines grade A, no certificate sits behind it, and two sellers using the same letter can be describing wildly different machines — we wrote that up separately in ASIC grading explained. A grade is nothing more than the seller’s summary of what they found, and it is worth precisely as much as the seller’s willingness to say how they found it.

So we use three words, we use them the same way on every listing on this site, and here is what each one commits us to.

Why you will not see A, B and C grades here

Because we would have to make them up. A letter scale implies a rubric — that a B is a defined distance from an A, that both mean the same thing next month, that another dealer’s B is comparable. None of that is true anywhere in this industry. A letter is a compression of the information you actually need into one character, and the compression is where the dishonesty lives. “It hashed at 95 TH/s on our bench for an hour, the fans are original, board two runs four degrees hotter than the others” is worth more to you than a B, and it is what we will write down for you.

If a supplier quotes you letter grades, the useful follow-up is not “what is your B?” It is “what did you measure, for how long, and what was the pass mark?”

What tested actually means, step by step

We published the whole thing rather than summarising it, because a used-hardware seller who will not tell you how they test is asking you to take the grade on trust: the six-step bench procedure a machine goes through here before it gets a grade and a listing. It runs from the physical inspection and the power-delivery check, through network and firmware, to hashrate under sustained load and board temperatures.

The figures that get recorded are the five measurements that matter: per-board hashrate, chip count per board, measured watts at the wall, pool-side hashrate rather than what the firmware says about itself, and board temperature under load. Two of those are the whole game. Real hashrate and real watts are exactly the two numbers a seller has an incentive to quote optimistically, which is why we take them at the wall and from the pool instead of repeating a spec sheet.

What tested does not mean, on a lot

Four honest limits, because each one has cost somebody money somewhere:

• A bench hour is not a month of uptime. A machine that hashes clean for an hour on a bench can still throw a board in week three. On a fleet that is not a scandal, it is a rate — and it is why the spares question below matters more than the grade question.
• Ask whether every unit was benched, or a sample was. On a 300-machine lot that is a real and reasonable difference, and it is a question we will answer straight for the specific lot you are buying. Do not accept “tested” as an answer to it from anybody, including us — make the seller say how many.
• A used machine is quoted at its used figure. We will not put a factory hashrate on a second-hand unit that does not reach it. Where a lot ships on a firmware tune, the listing says which tune, and the honest reading of an overclock is that it costs efficiency to buy terahashes — a boosted S19 drawing above its factory 3,250 W is doing exactly what physics says it should.
• Cosmetic wear is not a fault. Dust, scratches, label marks and sun-faded plastic are what mining hardware looks like after three years of doing its job. We photograph and describe it rather than pretending it away, and we do not charge you for a machine that looks new.

What we will never do

Blur used into new. Quote a used unit at a hashrate only a new one hits. Imply a grade a listing does not state. Describe a mixed batch as though it were uniform. A buyer wiring five figures for second-hand hardware is buying our honesty about its condition before they are buying the machines — overstate it once and there is no business here worth having.

How volume pricing works on used miners

There is no tier table on this page because this store does not operate one. Every lot above is priced against what we paid for that specific batch — what the machines are, what condition they came in, what we had to put into them, and what the market did that week. Per machine, the prices do not descend neatly with quantity, and printing them as a ladder would be inventing a discount structure that does not exist.

What actually moves the per-unit number on a wholesale used order:

• The model and the tune. Efficiency is the whole argument for buying used at all — see the efficiency and running-cost comparison for what J/TH does to a fleet’s economics.
• The grade you can accept. A buyer with a repair bench who takes as-is stock pays a fraction of what tested-working costs. A buyer who needs every machine hashing on arrival should pay more and should say so.
• Whether power supplies are included. On a hundred-unit order this single question is a five-figure swing. Some used stock moves bare. Get it in writing before you order — on any lot, from anybody.
• Quantity, but not linearly. Bigger is usually cheaper per machine because the freight and handling amortise, not because a discount tier fires.
• Freight to your door, which on a pallet order is a real line in the deal rather than a rounding error.

Tell us the quantity, the model and the destination and you get a real number for that order. The arithmetic you should be doing on your side of it — connected load, heat rejection, hashprice against your power price — is worked through in full in buying ASIC miners by the pallet. Read it before you spend, including the parts that are unflattering about our own listings.

When a machine in the lot arrives dead

Some will. Nobody who has moved a pallet of used miners will tell you otherwise, and anybody implying a zero failure rate is selling you something.

We do not publish a DOA percentage, because we have not measured one we would be willing to defend. A made-up number would be worth less to you than this: settle the DOA window and the replacement policy in writing, before the order goes in. At a hundred units the difference between a five-unit and a fifteen-unit allowance is real money, and it is a conversation that takes ten minutes before the invoice and turns into a dispute after it.

What we can tell you with certainty is what to do on delivery day, because that window is short and it closes whether or not you were busy:

1. Photograph the pallet before you cut the wrap. A freight damage claim without a photograph of the packaging as delivered is a much weaker claim.
2. Keep the packaging until the machines have run a clean 48 hours.
3. Run the acceptance test straight away — the full first-48-hours procedure is written up at acceptance-testing a miner you just received. Physical inspection, PSU check, network and firmware, hashrate against the listing, temperatures, then an extended load run.
4. Tell us the same day. Call +1 (781) 577-0377 or email ns@ingmining.com while the freight claim window is still open. A fault found on day two is a conversation; the same fault found on day thirty is an argument.

Plan for repairs as an operating cost rather than as an insult. Hashboards, fan assemblies, power supplies and control boards are the four things that fail on an S19 fleet, and we stock all four along with the hashboard testers and fixtures we use ourselves — see repair parts and testers and why mining hardware fails. Keeping a spares float on the shelf is cheaper than a machine sitting idle for a week waiting on a fan assembly we have on the shelf.

What the warranty covers across a lot, and what it does not

Warranty and return terms on this store are stated per unit, not per store, and that is deliberate. The sensible terms on a tested working machine and on a board explicitly sold for parts are not the same terms, so we do not publish one window covering everything and then bury the exceptions.

How to read it on a lot:

• Where a lot carries our 30-day guarantee, its listing names it. Ask us to confirm in writing exactly what that covers on your lot — DOA replacement, a hashrate shortfall, or both — so the expectation is documented rather than assumed.
• Most used and as-is stock carries no stated warranty term, and those listings say so rather than implying one. That is the honest position on hardware this age, and it is priced accordingly.
• Manufacturer warranty is almost always gone. On 2020-era S19s it has lapsed on age alone, and third-party firmware — Braiins OS, VNish — voids whatever remains. Several lots ship on exactly that firmware, because the telemetry and tuning are worth more to an operator than a lapsed warranty. What a mining warranty normally covers goes through the fine print.
• Nothing here covers the things that actually decide whether a fleet makes money: network difficulty, hashprice, your electricity rate, resale value, or a machine run outside its 5–40 °C envelope on a tune you chose. No hardware warranty from anybody covers those, and a seller implying otherwise is not offering you a warranty.

Get the grade, the DOA window, the return terms and what the guarantee covers in one written reply before you order. On used hardware those four sentences move the economics of the deal more than any number on the spec sheet.

Freight, palletising and who arranges it

Lots move as freight, not as parcels. An Antminer S19 is 14.5 kg before packaging, so ten machines is about 145 kg on a pallet and three hundred is roughly 4.4 tonnes across several — LTL at minimum.

Read from the checkout as this page loaded, so it is what you will actually be charged rather than a figure typed into an article. Outside the United States the checkout applies a per-unit international rate, which is not a freight quote for a pallet - on anything larger than a single machine crossing a border, ask us before you order. The full published detail is on shipping and delivery.

Every lot size that is not a row in that table is quoted, not rated. The checkout carries flat rates for the lot sizes above and nothing else, so a 20, 40, 50 or 300-machine order gets a real freight quote from us before you commit - and on a pallet order that is the right way round anyway, because the number depends on your zip code, whether you have a loading dock, and whether the driver needs a liftgate.

We arrange the freight. Palletising, wrapping, and crating where a lot warrants it are ours to organise, and we would rather do it than have a first pallet turn up shrink-wrapped to a broken skid. What we need from you is the receiving end: the delivery address, whether there is a loading dock or the driver needs a liftgate, whether the site can take a full trailer, and who is there to sign. If you would rather use your own carrier or freight account, that is fine too — say so on the quote and we will palletise and hold for collection.

Two things worth working into the decision before you commit. First, on a used machine freight is a large fraction of the landed price — at the cheap end of our used shelf the per-unit shipping is a meaningful share of the machine itself, which is one of the reasons a lot beats ten singles. Second, a pallet crossing a border is a customs job with paperwork, not a flat rate off a web form; ask before you order. The whole subject — landed cost, crating, insurance, and what to do when a pallet arrives damaged — is covered in the mining hardware shipping guide.

Lead times

Stock ships from the United States. The store’s published dispatch target is within 7 business days, and that is the figure to hold us to on anything sitting on the shelf.

For a fleet lot, we schedule the delivery window on the quote rather than publishing a number here. That is not evasion — it is that a lot which is boxed and palletised and a lot which needs benching, a firmware pass and a freight booking are genuinely different jobs, and quoting one figure for both would mean being wrong about one of them. Ask for the date on the quote, get it in writing, and hold us to that instead.

Paying for a five-figure order

Two things you should know before you reach for a card, stated plainly:

This website’s checkout cannot currently take card payment. It is a live limitation of the store rather than a policy, and it is why bulk orders here run as a quote and an invoice with terms agreed in writing first. On a five-figure lot that is the honest route anyway; nobody should be buying three hundred used miners through a shopping cart.

Ask for escrow if you want it. On an order this size it is a reasonable request from a buyer who has never met the seller, and it is a request we would rather answer than have you sit on. What we will not do is print a list of payment methods on this page that we have not confirmed we can process for your order — ask on the quote and you get a straight answer about what is available for the amount and the destination involved.

Whoever you end up buying from, the checks in how to vet an ASIC seller: serials, payment and paperwork are the ones worth running before the money moves. We would rather you ran them on us and were satisfied than skipped them. For the record: ING Mining LLC, Hanson, Massachusetts, trading as ING MINING®, a registered U.S. trademark, reachable on a phone number that a person answers.

Trade-ins and fleet buyouts

We buy this hardware — that is half of what this business is. Machines, hashboards, power supplies and whole fleets come in here, get tested and repaired, and go back out on the shelf you are reading.

What we do not have is a published buyback schedule or a valuation formula, and we are not going to fabricate one, because what a fleet is worth depends on the models, the count, their condition, where they are sitting and what week it is. So: send us the list — models, quantities, condition as best you know it, location, and photographs if you have them — and you will get a straight answer, including “we are not a buyer for that” if that is the answer. Upgrading a fleet and trading the old machines against the new ones is the same conversation, run once.

Request a quote on a bulk used miner order

Tell us what you are trying to do and you get a real number from a person who has actually seen the hardware. The fields below are the ones we cannot quote without; the rest are optional and half of our quotes start with “I do not know yet” in most of them.

Questions we get asked before a bulk used order

What is your minimum order quantity for used ASIC miners?

There is not a published one. The smallest lot currently listed is on the table near the top of this page, and single machines from the same stock are on the used shelf. If the quantity you want is not listed, ask — that is the normal case, not an exception.

Do you sell used ASIC miners by the pallet?

Yes. The larger lots here are palletised freight by definition — three hundred Antminer S19s is roughly 4.4 tonnes of hardware across multiple pallets and about 975 kW of connected load. Pallet quantities are quoted with freight and a delivery window rather than sold through the cart.

What does “tested” mean on your listings, exactly?

That the machine was powered on our bench and hashed at the rate stated in the listing. Refurbished means it was also cleaned, re-pasted or had parts replaced. As-is means it is sold without a working claim. Where a listing states no grade, it says so rather than implying one. The full bench procedure is published.

What happens if a miner in my lot arrives dead?

Photograph the pallet before you unwrap it, keep the packaging, run the 48-hour acceptance test immediately and tell us the same day while the freight claim window is open. The DOA allowance and replacement policy for your specific lot should be agreed in writing before the order goes in — ask for it, and we will put it in writing.

Do you publish a DOA or failure rate?

No, because we have not measured one we would defend in writing. Some units in any used batch will need attention; budget for a spares float and a repair bench rather than for a zero. We would rather tell you that than quote a flattering percentage.

Is there a volume discount schedule?

No. Each lot is priced against what we paid for that batch, so per machine the published prices do not descend neatly with quantity. Ask for a quote on the quantity you actually want.

Can I get PSUs with the lot?

Ask, on the specific lot, and get the answer in writing. Some used stock moves bare. Across a hundred machines that one question is a five-figure difference in what you are buying.

Will you ship a bulk order outside the United States?

Ask before you order. The checkout applies a flat per-unit international rate that is not a freight quote for a pallet; a lot crossing a border is a customs job and needs quoting properly.

Do you buy used miners or take trade-ins?

We buy hardware — machines, boards, supplies and fleets. There is no published buyback price list, so send the models, quantities, condition and location and you will get a straight answer, including no.