Series 1

The most popular and versatile standard knee mill ever produced.

With over 370,000 machines built over the past 70 years and counting, the Bridgeport® Series 1 Standard Knee Mill is the most popular milling, drilling and boring machine available and continues to fulfill the industry’s need for an accurate, reliable, and versatile mill.

Series 1 KneeMill
Table travel with Power Feed (X-Axis) 36 in
914 mm
Table travel without Power Feed (X-Axis) 31 in
787 mm
Saddle Travel (Y-Axis) 12 in
305 mm
Quill Travel 5 in
127 mm
Knee Travel (Z-Axis) 16 in
406 mm
Ram Travel 12 in
305 mm
Throat Distance (Min.) 6.75 in
171 mm
Throat Distance (Max.) 18.75 in
476 mm
Spindle (2J Head)
Power Rating 30 min. Duty Cycle 3 HP
2.2 kW
Power Rating Continuous 2 HP
1.5 kW
Tooling R-8 Collets
Drilling Capacity
Power Quill Feed 3 3/8 in
9.5 mm
Manual Drilling Capacity 2 CI/min
Boring Range 6 in
152 mm dia.
Spindle Diameter 1.875 in
48 mm
Quill Diameter 3.375 in
86 mm
Speed Range
High (Infinitely Variable) 500-4,200 RPM @ 60 Hz
Low 60-500 RPM @ 60 Hz
Power Quill Feed 0.0015 in/rev (0.038 mm)
Manual Adjust 0.003 in/rev (0.076 mm)
Manual Adjust 0.006 in/rev (0.152 mm)
Standard 49 x 9 in
1,245 x 299 mm
T Slot center distance 3 @ 2.5 in
64 mm
T-Slot Size 0.625 in
16 mm
Height Above Floor (Max.) 47.25 in
1,200 mm
Weight of Workpiece (Max.) 750 lb
340 kg
Machine Size
Height 87 in
221 mm
Weight 1,930 lbs
875 kg
Weight (Shipping) 2,075 lbs
941 kg
Floor Space 7 x 10 ft
2133 x 3048 mm

The Bridgeport Series I Standard Mill is the original milling, drilling and boring machine. The Bridgeport Series I Knee Mill is the most popular mill ever made with over 370,000 machines built over the past 70-plus years.

Standard Features

Innovative airflow cooling design that eliminates the need for external fans to prolong bearing life and prevent expansion from heat build-up.

One-Shot Lubrication System Chrome-Plated Ways and Gibs Color—Machine Tool Gray

Optional Features

2 or 3-Axis Digital Readout
Power Drawbar for R-8 or #30 Quick-Change Spindle Worklight Electrics—NFPA/NEMA-12 Standards, optional NRTL testing

A full range of accessories are available, including optional chrome-plated ways and gibs, to ensure that the machine will last a lifetime.

The Bridgeport Series I Standard Knee Mill is the single most ubiquitous milling, drilling, and boring machine in the world.  It can be found in job shops across the globe serving in countless capacities.

Related Videos

Showcasing the Bridgeport Series I Standard Knee Mill