The Allis Chalmers HD21 tractor weighs 45,500 lb (20,638 kg) using its primary published weight. That places it around the 87th percentile among tractors in the dataset, heavier than about 87% of its peers. With 225 hp, the tractor carries about 202.2 lb of published weight per horsepower.
The published Allis Chalmers HD21 weight is 45,500 lb (20,638 kg). The primary figure used for comparisons is 45,500 lb (20,638 kg), listed as Weight.
Tractor-weight benchmark
How this weight compares
All tractors in this dataset · 2,282 tractors in the benchmark.
Representative published weight
Very heavy
45,500 lb
Low1,984 lb
This model45,500 lb
Average9,927 lb
High21,767 lb
Low and high use the 10th and 90th percentiles of the peer group, which keeps one unusually light or heavy tractor from distorting the scale. Average is the peer-group mean.
At a glance
Tractor profile
Published weight45,500 lb (20,638 kg)
Overall weight bandExtra heavy
Tractor typeFarm tractor
Primary horsepower225 hp / 167.8 kW
Max length198 in (502 cm)
Max height99 in (251 cm)
Overview
Model information
Manufacturer
Allis Chalmers
Model
HD21
Category
Farm tractor
Model years
1954 – 1965
Tractor type
Farm tractor
Published weight variants
1
Published configurations
Weight variants
Shipping, operating, ballasted and drivetrain/configuration weights are kept separate when the source publishes them separately.
Weight type
Configuration
Weight
Metric
US tons
Variant / note
Weight
—
45,500 lb
20,638 kg
22.75
—
Dimensions, power & hauling
Technical details
Dimensions
Length198 in (502 cm)
Height99 in (251 cm)
Power & weight ratios
Primary power225 hp (167.8 kW)
Power basisEngine
Weight per horsepower202.2 lb/hp
Weight per foot of length2,757.6 lb/ft
Transport snapshot
Primary published weight45,500 lb (20,638 kg)
Maximum published weight45,500 lb (20,638 kg)
Maximum US-ton equivalent22.75 US tons
Weight context
Weight range45,500 lb (20,638 kg)
Primary weight basisWeight
Peer positionVery heavy among All tractors in this dataset · 98th percentile
Physical size classLarge
For transport planning, the representative published tractor weight is about 45,500 lb (22.75 US tons); published configurations reach 45,500 lb (22.75 US tons). Actual transport weight and dimensions can increase with fuel, ballast, a loader, implements, tires and other installed equipment.
Nearby benchmarks
Tractors with similar weight
Useful reference points from the same dataset.
Closest by published weight
Case IH Steiger 600 (45868 lb)
John Deere 9470RT (44910 lb)
John Deere 9520RT (44910 lb)
John Deere 9570RT (44910 lb)
Case IH Steiger 555 (46340 lb)
Closest comparable tractors
Case IH Quadtrac 9370QT (44000 lb)
Case IH Quadtrac 9380QT (44000 lb)
Case IH STX500QT Quadtrac (53264 lb)
Allis Chalmers HD20 (41000 lb, 175 hp)
John Deere 9300T (42090 lb, 345.5 hp)
Common questions
Allis Chalmers HD21 weight FAQ
How much does an Allis Chalmers HD21 weigh?
The Allis Chalmers HD21 weighs 45,500 lb (20,638 kg) using the primary published weight figure.
Is the Allis Chalmers HD21 a heavy farm tractor?
Yes. The representative figure sits at about the 98th percentile, heavier than roughly 98% of the all tractors in this dataset. That puts it in the very heavy range for this comparison. It is 35,573 lb heavier than the peer-group average of 9,927 lb.
Does the Allis Chalmers HD21 weigh more than 10,000 lb?
Yes. The representative published weight is 45,500 lb, and the heaviest published configuration on this page is 45,500 lb (22.75 US tons). Any trailer calculation also needs the trailer itself plus fuel, ballast, attachments and other equipment.
What is the Allis Chalmers HD21 weight-to-horsepower ratio?
Using the page’s representative 45,500 lb weight and 225 hp power figure, the tractor carries about 202.2 lb per horsepower. A lower lb/hp number means less tractor mass for each horsepower; this is a comparison metric, not a traction or performance rating.
How many tons does the Allis Chalmers HD21 weigh?
The representative published weight is about 22.75 US tons, while the full published range is 22.75 US tons. Loaded transport weight can be higher than the tractor specification.
