Hardinge GS-200-66

$100,000 - $160,000 Updated 2026-03-19

Key Specifications

Chuck Size

8 in (203 mm)

Maximum Bar Capacity

66 mm (2.60 in)

Maximum Turning Diameter

300 mm (11.81 in)

Maximum Turning Length

450 mm (17.72 in)

Spindle Speed (Max)

4,000 RPM

Spindle Power

18.5 kW (25 hp)

Overview

The Hardinge GS-200-66 is the big-bore variant of the GS-200 turning center, featuring a 66 mm bar capacity that extends the GS series into the medium-diameter production turning segment. The -66 suffix indicates the enlarged spindle bore, which accepts bar stock up to 66 mm (2.6 in) through the collet or chuck. This positions the GS-200-66 for production runs of parts in the 40-66 mm diameter range that exceed the standard GS-200's 51 mm bar capacity.

The main spindle delivers 18.5 kW (25 hp) continuous power at speeds up to 4,000 RPM, with approximately 280 Nm of torque for the heavier cuts demanded by larger bar stock in steel and stainless steel. The A2-6 spindle nose accepts both collet and 8-inch hydraulic chuck workholding, maintaining the Hardinge collet-ready tradition. The larger bore reduces maximum spindle speed compared to the standard GS-200, a standard physics trade-off on large-bore spindles.

The machine shares the GS-200's cast iron slant-bed platform with precision linear guideways, providing fast axis movement and smooth positioning. X-axis travel of 200 mm and Z-axis travel of 450 mm match the standard model, and the 12-station turret with optional live tooling and C-axis provides comprehensive mill-turn capability. Rapid traverse rates of 24 m/min in X and 30 m/min in Z maintain the linear-guideway speed advantage.

The GS-200-66 runs on Fanuc 0i-TF control and targets production shops that regularly process bar stock in the 50-66 mm diameter range — hydraulic component manufacturers, automotive suppliers, and general industrial production operations where 51 mm bar capacity is a genuine constraint. It competes with the Haas ST-20 Big Bore, Mazak Quick Turn 200 MY, and DN Solutions Lynx 2600M in the big-bore 8-inch turning center market.

Full Specifications

Parameter	Value
Chuck Size	8 in (203 mm)
Maximum Bar Capacity	66 mm (2.60 in)
Maximum Turning Diameter	300 mm (11.81 in)
Maximum Turning Length	450 mm (17.72 in)
Spindle Speed (Max)	4,000 RPM
Spindle Power	18.5 kW (25 hp)
Spindle Torque (Max)	280 Nm (207 ft-lb)
Spindle Nose	A2-6
Spindle Bore	66 mm (2.60 in)
Travel X	200 mm (7.87 in)
Travel Z	450 mm (17.72 in)
Turret Stations	12 (VDI)
Live Tooling	Optional
C-Axis	Optional
Guideway Type	Precision linear guideways
Rapid Traverse X	24 m/min (945 ipm)
Rapid Traverse Z	30 m/min (1,181 ipm)
Control	Fanuc 0i-TF
Machine Weight	3,500 kg (7,716 lb)

Specifications sourced from hardinge.com — verified 2026-03-28

Strengths & Limitations

Strengths

66 mm big bore handles medium-diameter bar stock that exceeds the standard GS-200's 51 mm capacity
18.5 kW spindle with 280 Nm torque provides adequate power for productive cutting in steel at full 66 mm bar capacity
Collet-ready spindle maintains the Hardinge concentricity advantage even at the larger 66 mm bore size
Linear guideways deliver fast 24/30 m/min rapids for reduced non-cutting time in production cycles
12-station turret with optional live tooling enables mill-turn processing for parts needing milling features
Shares the proven GS-200 platform, ensuring reliability and parts compatibility with the standard model

Limitations

4,000 RPM maximum spindle speed is lower than the standard GS-200's 4,500 RPM due to the larger bore diameter
Big-bore spindle may not deliver the same concentricity as the smaller-bore models on small-diameter bar work
Linear guideway construction provides less vibration damping than box-way models on interrupted cuts
Hardinge corporate restructuring may impact service network and parts availability

Best For

Hydraulic component manufacturers regularly machining valve bodies, cylinder tubes, and fittings from 50-66 mm bar stock Automotive suppliers producing axle components, bearing housings, and spacers in the medium-diameter bar range General industrial shops needing big-bore bar capacity with better precision than commodity turning centers offer Production environments where 51 mm bar capacity is a genuine constraint that limits part capability Shops adding a big-bore machine to complement existing standard-bore Hardinge lathes in their fleet

Frequently Asked Questions

01 What is the difference between the GS-200 and GS-200-66?

The GS-200-66 has a 66 mm bar capacity versus 51 mm on the standard GS-200, along with more spindle power (18.5 kW vs 15 kW) and more torque (280 Nm vs 200 Nm). The trade-off is lower maximum spindle speed (4,000 vs 4,500 RPM). Choose the -66 when bar stock regularly exceeds 51 mm; choose the standard GS-200 when 51 mm capacity suffices and higher speed is preferred.

02 How does the GS-200-66 compare to the GS-200-66L?

The GS-200-66L is the long-bed variant with extended Z-axis travel for longer parts. The standard GS-200-66 has 450 mm turning length, while the L variant extends this for shaft-type work. Both share the same 66 mm bar capacity and spindle specifications.

03 What bar feeders work with the 66 mm bore?

The 66 mm bore is compatible with mid-range bar feeders from LNS (Quick Load Servo 65/80), Iemca (Boss 542-HD), and Edge Technologies (FMB Turbo 5-65). Most standard bar feeders accommodate 65 mm stock; verify the specific feeder handles 66 mm before ordering.

04 Is the GS-200-66 suitable for large-diameter chuck work?

Yes, the 8-inch hydraulic chuck handles second-operation parts up to 300 mm swing diameter. While the big-bore spindle is primarily advantageous for bar work, the chuck capability makes the GS-200-66 versatile for both bar production and chuck-based second operations on castings and forgings.