Sherline 3C Collet Spindle Headstocks


Select your bearing and motor options for pricing.

Includes 1″ spindle wrench and spindle bar (chuck arbor and collet not included, shown for reference only)

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About Sherline’s 3C Collet Spindle Headstock

Our 3C Collet Headstock came from customers’ requests. Many customers asked for a spindle and collet to allow larger diameter stock to go through the headstock. With the 3C collet, our customers can now hold stock up to 1/2″ diameter that will pass through the headstock.

The 3C Collet Headstock is interchangeable with our standard headstock. The centerline height is the same, and the mounting system is the same. Therefore you can easily switch from our other headstocks to the 3C headstock.

The 3C Spindle is electroless nickel plated to aid in rust prevention and increase the spindle’s surface hardness for durability. The headstock includes a spindle pulley and a precision ground head key.

If you wish to use a chuck with the 3C headstock, you can purchase the 3C to ¾-16 chuck arbor. All of our 3- and 4-jaw chucks with a ¾-16 thread will fit on this arbor.

When it comes to making the 3C collets, we can’t compete with the cheap import collets, and companies like Hardinge already make quality 3C collets in many sizes. Therefore, we leave it up to you to decide from whom you want to buy your collets.

3C Collet Range Specifications

Inch Metric
.070″ – .542″ 1 mm – 13 mm

NOTE: Hardinge also offers custom sizes and both hex and square sizes.

NOTE: Certain attachments, like the Thread Cutting Attachment, the Lathe Power Feed, and the 10,000 RPM Pulley Set, will NOT work with the 3C Collet Headstock. If you are uncertain if an accessory will work with the 3C Collet Headstock, please contact us for more information.

Custom Build Your Standard Headstock with the Following Options:

  • Class 3 or Class 5 Bearings
  • With or without a DC Motor and Speed Control Unit

NOTE: The 3C collet spindle has standard electroless nickel plating. There is NO option for a plain finish.

Bearing Options

The bearings in the headstocks are offered in two classes: C3 and C5.

The C3 bearings have been standard in all of our headstocks for years and have proven reliable over that time.

The C5 bearing headstocks come at a higher price than the standard C3 bearings headstocks, but they run smoother, quieter, and cooler than our regular class 3 bearing headstocks and are more suitable in an industrial setting.

Sherline’s new C5 headstocks feature two 20 mm, class 5, lifetime-lubricated ball bearings with an adjustable preload nut. The preload is adjusted at the factory to .0002″ (.005 mm) of endplay. The preload adjustment is controlled by the outer races of the bearings being held apart by the headstock case and the inner races being pulled together by the preload nut. This is appropriate for extended running at speeds of 4000 RPM or less. You may need a slightly looser preload setting of .0003″ for operating speeds up to 10,000 RPM.

Optional DC Motor with Speed Control

You can order your headstock with or without our DC motor and speed control unit.

The powerful DC motor offers its maximum torque at low RPM, where you need it most in machining. This means it provides far more useable power than an AC/DC motor of equivalent or larger size. It also offers smoother and quieter operations than an AC/DC motor.

A sophisticated speed control unit powers and controls the motor. The speed control unit accepts any incoming AC current from 100 VAC to 240 VAC, 50 or 60 Hz, and automatically outputs 90V DC to the motor so that this unit can be used anywhere in the world without a transformer. All you need is the correct wall plug or converter. Once the on/off switch is switched to the “ON” position, a speed control knob is used to vary the entire range’s speed. With the pulley in the “normal” position, the speed range is about 70 to 2800 RPM. In the “high torque” position, the maximum speed is cut in half, but torque at any given speed is much greater*.

*NOTE: The full torque at the lower RPM range of 70-1,400 will be obtained when the motor pulley belt is in the low-speed/high-torque pulley groove. The high-speed pulley groove will have full torque in the 1,200 to 2,800 RPM range.

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF 30113 Instructions

Instructions PDF Download

Download PDF DC Motor Instructions

Instructions PDF Download

Download PDF DC Motor Wiring Instructions

Instructions PDF Download

Headstock Specifications
Spindle Specifications
Headstock spindle nose 3C collet, 1/2″ Through-hole
Pulley groove side angle 19°
Coating Electroless Nickel (uniform coating thickness up to .004″)
Allowable Tolerances
TIR (total indicator runout) at spindle nose 0.001″ (Better runouts may be attained upon request)
Spindle End Play (adjustable with preload nut), Factory Settings 0.0002″
Headstock Bearings
Designation/stock number (ZZ refers to “double shielded”) 6004ZZ
Size of bore 20 mm (0.7874″)
Tolerance of bore 0.0004″
Outside Diameter 42 mm (1.6535″)
Tolerance of OD 0.0005″
Width 12 mm (0.4724″)
Bearings 9 balls, 1/4″ Dia.
DC Motor & Speed Control Specifications
Two-speed pulley RPM range* Normal Belt Position=70-2,800
High-Torque, Low RPM Position=70-1,280
Type of enclosure Totally enclosed, non-vented
Duty rating Continuous–10 oz. in. at 6,100 RPM, .85 amperes; Intermittent–30 oz. in. at 5500 RPM, 1.75 amperes (5 minutes on / 15 minutes off)
Output horsepower .06 KW (60 W) at 10 oz. in. / 6,100 RPM
AC voltage (input) Normally 115 VAC, 60 Hz, Single Phase to rectifier (Sherline electronic speed control converts any input from 100 VAC to 240 VAC, 50-60 Hz.)
DC voltage 90V DC to motor (60 Hz)
Speed in RPM 6,100 RPM continuous
Class of insulation Class A, 105° (C.) insulation system
Normal full load current .85 amperes
Starting current 1.7 amperes instantaneous starting current (<100 milliamperes). This is also stall current in True RMS
Max current at time of changeover from lower speed to higher speed Depends on load
Type of motor 3.00 inch (outer diameter) sub-fractional horsepower brush-type permanent magnet motor
Temperature rise at ambient 50° C. Less than or equal to 45° C.
Motor frame size 3 inches
End use of motor Drive unit for lathe or mill

*NOTE: The full torque at the lower RPM range of 70-1,400 will be obtained when the motor pulley belt is in the low-speed/high-torque pulley groove. The high-speed pulley groove will have full torque at the 1,200 to 2,800 RPM range.

Headstock Bearing Replacement

We don’t recommend that customers replace the headstock bearings. We use custom fixtures to align the spindle and the bearings. You must return your headstock to our facility for bearing replacement*. Contact our customer service department,, for an RMA number before sending your headstock back for service.
*NOTE: Fees apply
Click the links below to learn more about the specialized fixtures and procedures for setting the headstock bearing preload.
PDF: Replacing Headstock Bearings
Video: Setting the Headstock Bearing Preload

Headstock Parts
Part No. Description Quantity
40105 3C Headstock Case 1
40580 Spindle “Tommy” Bar 1
40233 3C Headstock Spindle 1
43233 3C Main Spindle Pulley 1
40163 3C Preload Nut 1
40430* 3C Headstock Class 3 Bearings (*P/Ns 30113 and 3310 only) 2
40403* 3C Headstock Class 5 Bearings (*P/Ns 30104 and 3315 only) 2
40260 Precision Ground Head Key 1
30117 3C Collet Draw Bar 1
30118 3C Collet Draw Bar Knob 1
30123 3C Headstock Spindle Bearing “Washer” 1
30124 3C Drawbar Thrust Washer “Inner” .126″ 1
30125 3C Drawbar Thrust “Needle Bearing” 1
30126 3C Drawbar Thrust Washer “Outer” .032″ 1
40540 5/16-18 X 3/4″ Cone Point Set Screw 2
30127 3C Spindle Key Way Set Screw 1
30128 3C Spindle “End Cap” 1
37160 Rotary Table Preload Nut 1
43234 3C 1″ Multi-Wrench 1
40520 10-32 x 3/16″ Cup Point Set Screw 1
30129 5-40 x 1/8″ Cup Point Set Screw 1
40580 Spindle “Tommy” Bar 1
Motor Parts* (*P/Ns 3310 and 3315 only)
Part No. Description Quantity
40020 Motor Bracket 1
40040 Drive Belt 1
43000 DC Speed Control Assembly w/Belt Guard 1
43360 Stepped Motor Pulley 1
45475 Hill House DC Motor (2020) 1

Click the P/Ns below to download a zipped version of the IGS 3D CAD files. You will need to extract the zip file before viewing the IGS file.
30113 3C Collet Headstock 3D IGS Model
30113 3C Collet Headstock + 3C to 3/4-16 Chuck Arbor 3D IGS Model (Arbor shown for reference only. Not included.)
30113 3C Collet Headstock + 3C to 3/4-16 Chuck Arbor + 1040 3.1″ 3-Jaw Chuck 3D IGS Model (Arbor and chuck shown for reference only. Not included.)
You need an IGS viewer to view .igs files. CLICK HERE to download a FREE IGS viewer.