Knee Mills & Vertical Machining Centers
Used Bridgeport Series II Special: Sell or Buy at Auction
The Bridgeport Series I knee mill is the most widely produced milling machine in American manufacturing history and is still the default toolroom mill in thousands of shops. The brand later passed to Hardinge, which carried it through the EZ-Trak CNC knee mills and the Torq-Cut and GX vertical machining centers. Used demand stays unusually deep for a design this old, because nearly every working machinist has run one and parts, tooling, and retrofit controls remain easy to source.
The Bridgeport Series II Special is the larger, heavier sibling of the Series I, built on the same manual knee-and-ram architecture but scaled up to an 11 by 58 inch table, roughly 1,500 pounds of table capacity, and longer travels across all three axes. It still runs the familiar R8 spindle and a 60 to 4,200 RPM variable-speed head, so operators trained on a Series I step onto it without relearning the machine. Shops that outgrew a Series I's footprint, but still want manual control rather than CNC, are the core auction buyers. KD Auctions markets each Series II to its 500,000+ industry contacts to find them fast.
Buying a Used Series II Special
Toolrooms, plant maintenance departments, prototype and R&D shops, job shops that want a manual mill alongside CNC capacity, trade schools and community colleges, and short-run fabricators. Manual Series I mills draw the largest and most local bidder pool at any machine shop auction because they move without a rigging crew; EZ-Trak, Torq-Cut, and GX buyers are shops looking for CNC capability in a small footprint.
Browse Upcoming Auctions →Selling Your Series II Special
A Bridgeport is one of the most reliably sold lots at a machine shop auction: there is always a bidder. What separates a strong result from an average one is condition rather than year, specifically table and way wear, leadscrew backlash, spindle noise, and whether the power feed, DRO, vise, and original tooling stay with the machine.
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Frequently Asked Questions
How is a Bridgeport Series II Special different from a Series I at auction?
The Series II carries a larger 11 by 58 inch table, roughly double the table capacity, and longer axis travels than the Series I's 9 by 42 or 9 by 48 inch table, but both run the same R8 spindle and manual knee-mill operation. That makes the Series II attractive to shops handling bigger parts or heavier stock without stepping up to CNC. KD Auctions prices and markets each model to the buyers actually shopping for that size class.
What is my Bridgeport Series II Special worth?
Value depends on table and way condition, spindle hours, whether it carries chrome ways, a DRO, or power feeds, and the tooling included. KD Auctions provides a free AMEA-accredited, USPAP-compliant appraisal reporting orderly and forced liquidation value, so you know a realistic figure before committing to a sale.
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About Bridgeport
The Bridgeport Series I knee mill is the most widely produced milling machine in American manufacturing history and is still the default toolroom mill in thousands of shops.
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