Knee Mill Specifications
For more than 70 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.

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. Its hand-scraped ways and precision-ground ram and turret ensure long-lasting reliability and performance. A full range of accessories are available, including optional chrome-plated ways and gibs to ensure that the machine will last a lifetime.

The Series I Standard is built by Hardinge Inc. in our factory in Elmira, New York. Hardinge is the only authorized provider of Bridgeport knee mills, parts and service.

Key features of the Bridgeport Series I Machine: View Full Brochure
Table travel (X-Axis):
36" (914 mm)
Saddle Travel (Y-Axis):
12" (305 mm)
Quill Travel:
5" (127 mm)
Knee Travel (Z-Axis):
16" (406 mm)
Ram Travel:
12" (305 mm)
Throat Distance (Min.):
18.75" (476 mm)
Throat Distance (Max.):
6.75" (171 mm)
49 x 9" (1219 x 229 mm)
T Slot center distance:
3 @ 2.5" (64 mm) centers
T-Slot Size:
0.625" (16 mm)
Height Above Floor (Max.):
47.25" (1200 mm)
Weight of Workpiece (Max.):
750 lb (340 kg)
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
Drilling Capacity
Power Quill Feed 3:
3/4" Dia. (19 mm)
Manual Drilling Capacity:
3/4" (19 mm) Mild Steel
Boring Range:
6" (152 mm) Mild Steel
Spindle Diameter:
1.875 in (48 mm)
Quill Diameter:
3.375" (86 mm)
Speed Range
High (Infinitely Variable):
500-4200 rpm
60 - 500 rpm
Power Quill Feed:
0.0015"/rev (0.038 mm)
Manual Adjust:
0.003"/rev (0.076 mm)
0.006"/rev (0.152 mm)
Floor Space:
8.3 x 5.3 ft (2.53 x 1.6 m)
Machine height:
7.04 ft (2.15 m)
Mass of Machine:
1950 lb (885 kg)
2095 lb (950 kg) (Shipping)

View Full Brochure

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