Series I

About Manual Mills

For more than 60 years, the Bridgeport Series I Standard Mill - the original, all-purpose mill - has been the "real thing" in milling, drilling, and boring for metalworking shops throughout the world. Today, the Series I Standard continues to fulfill the industry's need for an accurate, reliable, and versatile mill.

Key Specifications

Machine height
87 in. (2.21 m)
Mass of Machine
1,930 lb (875 kg)
Mass of Machine
2,075 lb (941 kg) (Shipping)
Floor Space
7 x 10 ft (2.13 x 3.0mm)
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)
Speed Range
High (Infinitely Variable)
500 – 4,200 RPM @ 60 Hz
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)
Drilling Capacity
Power Quill Feed 3
3/8 in (9.5 mm)
Manual Drilling Capacity
2 CI/min
Boring Range
6 in dia. (152 mm)
Spindle Diameter
1.875 in (48 mm)
Quill Diameter
3.375 in (86 mm)
Spindle (2J Head)
Power Rating 30 min. Duty Cycle
3 HP (2.2 kW)
Power Rating Continuous
2 HP (1.5 kW)
R-8 Collets
Table travel (X-Axis)
36 in (914mm) with Power Feed
Table travel (X-Axis)
31 in (787mm) without Power Feed
Saddle Travel (Y-Axis)
12 in (305mm)
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)

Product Description

The Series I Standard features an innovative airflow cooling design that uses no external fans to prolong bearing life and prevent expansion from heat build-up. A full range of accessories are available, including optional chrome-plated ways and gibs to ensure that the machine will last a lifetime.  Hardinge is the only authorized provider of Bridgeport knee mills, parts and service. Please visit to learn more. Key features of the Bridgeport Series I Machine:

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