Holder A21
The Holder A21 is a tractor produced by Holder. The listed engine power is Diesel (listed): 19.7 hp / 14.7 kW. Transmission: 8 forward and 4 reverse. Operating weight: 2,315 lbs 1050 kg.
Engine Power
Diesel (listed): 19.7 hp / 14.7 kW
Fuel & Capacities
Diesel
Transmission
8 forward and 4 reverse
Operating Weight
2,315 lbs
1050 kg
Overview
 |
|---|
Production | |
|---|---|
Manufacturer | Holder |
Holder A21 Engine | |
|---|---|
2-cyl diesel | |
Engine details ...  |
Holder A21 Transmission | |
|---|---|
8-speed | |
Transmission details ...  |
Holder A21 Power | |
|---|---|
Engine | 19.7 hp
14.7 kW |
Mechanical | |
|---|---|
Four-wheel drive |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540 |
Dimensions & Tires | |
|---|---|
Wheelbase | 51.2 inches
130 cm |
Weight | 2,315 lbs
1050 kg |
Front tire | 7.00x18 |
Rear tire | 7.00x18 |
Full dimensions and tires ...  | |
Engine
Engine Detail — Diesel
Fuel Type | Diesel |
Configuration | 2-cylinder |
Power | 19.7 hp
14.7 kW |
Transmission
Transmission — 8 forward and 4 reverse
Gears | 8 forward and 4 reverse |
Dimensions
Holder A21 Tires | |
|---|---|
Ag front | 7.00x18 |
Ag rear | 7.00x18 |
Dimensions | |
|---|---|
Wheelbase | 51.2 inches
130 cm |
Length | 110.2 inches
279 cm |
Width | 33 inches
83 cm |
Height | 41.3 inches
104 cm |
Weight | 2,315 lbs
1050 kg |
Ground clearance | 9.3 inches
23 cm |
Recommended Implements & Sizing Guide
Engineering recommendations for Holder A21 based on its 19.7 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 4 ft (48 in)1.2 m | Light Duty | Pasture clipping and light brush under 1" diameter. |
Rotary TillerSeedbed Prep | 42 to 48 in105 - 120 cm | Light Duty | Covers compact tractor tire width. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Holder A21.
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Holder A21 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Holder A21.
Converted Equivalents:
Horsepower (HP)19.7 hp
Kilowatts (kW)14.7 kW
Metric Horsepower (PS / CV)20 PS
Direct Competitor Comparison
Compare Holder A21 against same-era industry alternatives in the same horsepower class.
Current Model
Holder
Holder A21
Engine Power:Diesel (listed): 19.7 hp / 14.7 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 8-16
Engine Power:17.8
Production Years:1917 - 1922
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