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parts, and accessories for bench top machinists.
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Mini Mill Comparison

This chart compares the specifications of the major brands of the mini mill. Bold rows highlight what we feel are significant differences, rather than mistakes or variations in measurement.

Mini mills are sold by LittleMachineShop.com, Grizzly, Harbor Freight, Homier, and Micro-Mark
  LittleMachineShop.com LittleMachineShop.com Grizzly Industrial, Inc. Harbor Freight Tools Micro-Mark Micro-Mark
Brand HiTorque HiTorque Grizzly Central Machinery MicroLux MicroLux
Model 3900 3960 G8689 44991 84630 82573
Price Lookup Lookup Lookup Lookup Lookup Lookup
Head Tilt 45°-0°-45° Solid Column 45°-0°-45° 45°-0°-45° 45°-0°-45° 45°-0°-45°
Table 4.1″ x 18.1″ 4.1″ x 18.1″ 3-5/8″ x 15-3/4″ 3-11/16″ x 15-7/8″ 3-3/4″ x 16″ 3-3/4″ x 16″
T-slots   12 mm (7/16″) 12 mm (7/16″) 12 mm (7/16″) 12 mm (7/16″) 12 mm (7/16″) 12 mm (7/16″)
Spindle Taper R8 Taper R8 Taper #3 Morse Taper R8 Taper R8 Taper #3 Morse Taper
Drilling Capacity 0.5″ 0.5″ 1/2″ 1/2″    
Face Milling Capacity 1.2″ 1.2″ 1″ 1″    
End Milling Capacity 0.6″ 0.6″ 1/2″ 1/2″    
Swing 12″ 12″ 12-3/4″ 12″ 12″ 12″
Spindle Clearance 11″ 11″ 11-1/2″ 12-1/4″ (10 1/2″ measured) 11″ 11″
Spindle Stroke 9.3″ 9.3″ 5″ 8.5″ 7″ 7″
X-Axis Travel 11.8″ 11.8″ 9-1/4″ 9″ 8″ 8″
Y-Axis Travel 5.1″ 5.1″ 4″ 4″ 4″ 4″
Spindle Speed 0-2500 RPM 0-2500 RPM 0-1100, 0-2500 RPM 0-1100, 0-2500 RPM 0-2500 RPM 0-1100, 0-2500 RPM
Motor Controller Brushless DC Brushless DC PWM PWM Brushless DC PWM
Horsepower 0.67 HP
(500W motor)
0.67 HP
(500W motor)
0.47 HP
(350W motor)
0.47 HP
(350W motor)
0.67 HP
(500W motor)
0.47 HP
(350W motor)
X & Y-Axis Dials 0.0625″ / Turn 0.0625″ / Turn 0.0625″ / Turn 0.0625″ / Turn 0.050″ / Turn 0.050″ / Turn
Z-Axis Dial 0.060″ / Turn, 0.001 Graduations 0.060″ / Turn, 0.001 Graduations 0.060″ / Rev, 0.002 Graduations 0.060″ / Turn, 0.001 Graduations 0.060″ / Turn, 0.001 Graduations 0.060″ / Turn, 0.001 Graduations

All the mini mills listed on this page are made in the same factory in China. Except where they have different features, the parts are interchangeable. In our experience there is not a noticeable quality difference between the brands.

LittleMachineShop.com HiTorque Mini Mill is the best in its class. It has the most power, most torque, and a larger table than other mills in its size range.
The tilting column version (model 3900) provides the same 45°-0°-45° tilting head as all the other Mini Mills. The solid column version (model 3960) was specifically designed for LittleMachineShop.com to maximize rigidity. The column bolts solidly to the base with four cap screws and the wall thickness of the column is significantly greater.
The 500 Watt (0.67 hp) brushless spindle drive motor provides tremendous low end torque. And you can vary the speed from 50 RPM to 2500 RPM continuously. There are no gears to shift. And, with no gears, the HiTorque Mini Mill is the quietest in its class.
The large mill table provides 50% more table area than other mini mills. It also has 30% more travel in each direction. The resettable feed dials allow you to zero them at any point.

Grizzly Industrial, Inc. sells the Grizzly model G8689 mini mill. The Grizzly mini mill has a 3 Morse taper spindle. It comes with two 3 Morse taper collets; a 3/8 inch collet and a 1/2 inch collet.

Harbor Freight Tools distributes the Central Machinery model 44991 mini mill. The Harbor Freight mini mill has an R8 spindle.

Micro-Mark carries the MicroLux model 82573 mini mill. The Micro-Mark mini mill has a 3 Morse taper spindle. The MicroLux mini mill has one unique feature; the table feed dials both advance 0.050 inch per revolution. On all the other mini mills the dials advance 1/16 inch per revolution. The 0.050-inch per turn is easier to use than the 0.0625-inch per turn of the other mini mills. Micro-Mark will have you believe that the other mini mills have metric dials, but they do not.

Micro-Mark also carries the MicroLux model 84630 R8 mini mill. This mini mill is similar to their other mini mill except it features the 500 watt brushless DC drive system.

Homier Mobile Merchants previously distributed the Speedway mini mill model 03947. The Homier mini mill has an R8 spindle.

ToolsNow.com (Cummins Industrial Tools) previously distributed the mini mill model 7877. The ToolsNow mini mill has an R8 spindle.

This information is put together from published specifications and by measurements made by users of the machines. It is believed to be accurate, but there are no guarantees.

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