IH Tractors: International Harvester Models & Specs

Reviewed September 2026 against Wikipedia’s production-history entries and TractorData’s specification database.

Try it: Run your own numbers →

International Harvester tractors — the Farmall letter series, the round-fender 60-series, and the Cub — were built between 1939 and 1963, and the models that survive are still working farms across the US Midwest today because they run on mechanical fuel injection and points ignition that almost any farm shop can service. If you’re comparing international harvester tractor models before buying, the numbers that matter are production volume (how easy parts will be to find), tested horsepower, operating weight, and original price adjusted against what the same model brings at auction now. This article covers both: the historical specs for the six most common models, and a plain method for pricing one you’re looking at today.

International Harvester Production Numbers: Which Models Are Common

The single most useful number when you’re shopping international harvester tractors for sale isn’t horsepower — it’s how many of that model were built. A high production run means parts interchangeability, active forums, and dealers who’ve seen the model before. A low run means you’re on your own for anything beyond the basics.

The Farmall H is the volume leader by a wide margin: Wikipedia’s Farmall H entry puts total production at 390,000 units across its 1939–1954 run, at 26 gross horsepower. That scale is why H parts and manuals are the easiest of any letter-series model to source secondhand. Compare that to the International Harvester 660, built 1959–1963: only 6,959 units according to Wikipedia’s Farmall 60-series entry — a fraction of the H’s run, and it shows in how rarely 660s turn up compared to 460s and 560s from the same series.

Within that same 60-series modernization (the round-fender tractors that replaced the letter series), the 460 saw 35,000 units built 1958–1963 at 55 gross horsepower, and the 560 saw 65,982 units over the same years at 66 gross horsepower, per TractorData’s Farmall 560 specification page. The 560 outsold the 460 nearly two to one, which is one reason 560 parts are somewhat more available today.

These figures come from Wikipedia’s model pages and TractorData’s tractor database, both cited above — re-check them directly if you want the exact wording of the production claim, since TractorData in particular updates its research database on a rolling basis rather than on a fixed schedule.

IH Tractor Models: Specs Model by Model

Six models account for most of what actually surfaces as “international harvester tractors for sale” listings in the US: the Cub, Farmall A, Farmall C, Farmall H, Farmall M, and the round-fender 460/560/660 series. Below is what’s documented for each, with the gaps flagged rather than guessed at.

Farmall H: The Volume Leader

Built 1939–1954, the Farmall H is rated at 26 gross horsepower and was produced in a run of 390,000 units — the largest of any model covered here, per Wikipedia. That production scale is the practical reason it’s the model most restoration shops will take on without hesitation: replacement parts, both original and reproduction, exist in volume because there are simply more Hs out there to cannibalize, restore, or reference.

Farmall M: The Bigger Sibling

The Farmall M ran alongside the H from 1939 to 1953 and stepped up to 38 gross horsepower, per Wikipedia’s Farmall M entry. If a listing describes a letter-series tractor as “the bigger one” next to an H, this is usually it — same generation, meaningfully more power, sized for larger row-crop acreage than the H was built for.

Farmall C: The Small-Acreage Model

The Farmall C, built 1948–1951, is rated at 23 gross horsepower per Wikipedia’s Farmall C entry — modest even against the H, and it’s the model most often recommended for market gardens, orchards, and anyone whose fields are measured in single-digit acres rather than hundreds.

Farmall 560: The Best-Documented 60-Series Model

The 560 is the most thoroughly specified model in this lineup because TractorData’s page for it is unusually complete. Built 1958–1963 in a run of 65,982 units, it delivered 66 gross horsepower, weighed between 6,563 and 6,785 lbs depending on configuration, and carried an original MSRP of $5,500 in 1963, according to TractorData’s Farmall 560 page. That 1963 sticker price is worth holding onto as a reference point — it’s a documented number from the manufacturer’s own era, not an estimate.

Farmall 460: The Mid-Size 60-Series Model

The 460, also built 1958–1963, came in at 55 gross horsepower per TractorData’s Farmall 460 page, with 35,000 units produced according to Wikipedia’s 60-series entry. It sits squarely between the smaller letter-series models and the 560 in both power and rarity.

International Harvester 660: The Rare One

At only 6,959 units built 1959–1963, the 660 is the outlier of this group — a tenth the production run of its 560 stablemate. If you find one for sale, expect a longer wait for parts and a smaller pool of other owners to ask for advice, but also a tractor collectors are more likely to want specifically because so few remain.

Comparison Table: Horsepower, Weight, Production, Price

Here is every figure from the research above in one place. Where a cell says “not published,” that’s deliberate — it means the two sources checked for this article (Wikipedia and TractorData) don’t carry that number for that model, not that the number doesn’t exist somewhere.

Read across this table and a pattern shows up: horsepower and production volume don’t move together. The H has the biggest production run of any model here (390,000) but middling power (26 hp); the 560 has less than a fifth of the H’s production run but nearly triple its power. Neither number tells you what the tractor is worth on its own — that’s what the calculator further down is for.

Value Calculator: What a Model’s Rarity Tells You About Price

Used-equipment pricing sites like MachineryTrader and Purple Wave update their listings from actual auction results and dealer inventory daily, so any dollar figure printed in an article is stale within weeks — check those platforms directly for what a specific model is asking right now. What doesn’t go stale is the relationship between a model’s production volume and how its price tends to hold: fewer surviving units built against comparable demand generally support a higher asking price for comparable condition. The calculator below lets you plug in a baseline price you’ve found in a current listing, along with the two production-volume figures from the table above, and see the rarity ratio implied.

Assumptions: this is a directional estimate, not an appraisal. It uses a square-root scaling on the production-volume ratio (rarity has diminishing returns on price, not linear returns) multiplied by a condition factor. It excludes freight, restoration cost already invested, regional demand differences, and implement compatibility — all of which move real auction prices independently of rarity. Always confirm against current listings on MachineryTrader or Purple Wave before making an offer.

Where International Harvester Tractors for Sale Actually Turn Up

• Auction platforms: MachineryTrader and Purple Wave post new listings continuously and refresh pricing from actual closed sales — check these for a same-week read on what a specific model, in specific condition, is clearing at.
• Farm auctions and estate sales: Often the source of the best-maintained examples, since these tractors are frequently sold as part of a working farm’s equipment line, with maintenance history the seller’s family can speak to directly.
• Vintage tractor clubs: Regional and model-specific clubs (particularly active around the Farmall letter series) are usually the fastest way to find a seller who has already done the mechanical verification work for you.
• USDA NASS Quick Stats: Not a sales channel, but USDA’s Economic Research Service chart on precision agriculture adoption is worth reading if you’re weighing a vintage IH purchase against buying into modern mechanization trends — it shows how adoption of newer equipment and precision practices is tracked nationally, which is useful context for deciding how a 60-year-old tractor fits your operation’s long-term plan. NASS’s own Quick Stats database (quickstats.nass.usda.gov) publishes an annual mechanization trends survey broken out by region and farm size, and that’s the primary source to check for the current year’s adoption figures rather than relying on any secondary summary.

On any listing, ask for maintenance records and photos of the block, manifold, and PTO shaft specifically — not just the exterior. A model with a large production run like the H or 560 gives you leverage here, because a seller who can’t produce basic history has plenty of competing listings you can walk to instead.

Running an IH Tractor Alongside Modern Field Monitoring

None of the models above have onboard telematics, and that’s by design — it’s why they’re cheap to keep running. But the fields they work still benefit from the same monitoring modern equipment gets, just delivered separately, by satellite rather than a cab display. Farmonaut’s satellite platform tracks crop health, soil moisture, and field boundaries independent of whatever’s pulling the implement, so an operation running a 1958 Farmall 460 gets the same NDVI-based advisory a new tractor’s built-in system would offer.

• Field mapping and monitoring: Satellite imagery tracks crop health across the acreage an IH tractor is working, independent of the machine itself.
• Jeevn AI advisory: Combines field data into tillage, planting, and irrigation timing recommendations that apply regardless of what equipment executes them.
• Traceability: Blockchain-based product traceability documents field-to-market history for buyers who ask for it, whether the tillage was done with a 1948 Farmall C or a current-model tractor.
• Fleet management: If your operation runs a mix of vintage IH tractors and newer machinery, fleet management tools track hours, location, and maintenance schedules across the whole lineup in one place.
• Carbon footprint tracking: Satellite-based carbon monitoring quantifies field-level emissions and sequestration regardless of the age of the equipment doing the field work.

Developer integrations: Farmonaut API | Developer Docs

Frequently Asked Questions

Further reading:

• satellite technology platforms

The Bottom Line on Buying an IH Tractor

The models that show up most often as international harvester tractors for sale — the Cub, the Farmall letter series (A, C, H, M), and the round-fender 460/560/660 line — span a documented range from 23 to 66 gross horsepower and from 6,959 to 390,000 units built. Those two numbers, production volume and horsepower, don’t move together, and neither one alone tells you what a specific tractor should cost. What does: production volume as a proxy for parts and service availability, condition verified against real maintenance records, and a current price pulled from an active listing rather than an old article.

Use the comparison table above to place a model in context, the calculator to translate rarity into a directional price adjustment, and TractorData’s individual model pages — like its Farmall 560 page — to pull the fullest spec sheet available before you buy. Whatever model you land on, a satellite view of the fields it’s about to work is a separate upgrade from the tractor itself: explore that side of the operation at Farmonaut.