3C Collet Headstock

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

SKU: 30113 Category:

Product Description

About the 3C Collet Headstock

As with many of our accessories and machine modifications, our decision to make a 3C Collet Headstock was based on customers’ requests. Over the years, many of our customers have requested a spindle and collet that would 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.

When we designed our 3C Collet Headstock, we also designed it to be interchangeable with our standard headstock. The centerline height is the same. The mounting system is the same. Therefore you can easily switch from any of 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.

We made the 1″ spindle wrench to go with the headstock to tighten and loosen the collets. The wrench is in a size range that will allow you to exert sufficient force without exerting excessive force. It is also in a size range that will make it easier to handle (than a standard 1″ wrench) when you are tightening and loosening the collet. Also included is a “Tommy” bar that you insert into one of the “Tommy” bar holes on the 3C headstock draw-bar knob. This is to aid in tightening and loosening the 3C collet.

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-aw 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 who you want to buy your collets from.

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

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

Headstock Specifications
TIR (total indicator runout) at spindle nose 0.001″ (Better runouts may be attained upon request)
End play at factory preload setting 0.0002″ (preload is adjustable)
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, kim@sherline.com, 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

40105 3C Headstock Case
40580 Spindle “Tommy” Bar
40233 3C Headstock Spindle
43233 3C Main Spindle Pulley
40163 3C Preload Nut
40430 3C Headstock Bearings (2)
40260 Precision Ground Head Key
30117 3C Collet Draw Bar
30118 3C Collet Draw Bar Knob
30123 3C Headstock Spindle Bearing “Washer”
30124 3C Drawbar Thrust Washer “Inner” .126″
30125 3C Drawbar Thrust “Needle Bearing”
30126 3C Drawbar Thrust Washer “Outer” .032″
40540 5/16-18 X 3/4″ Cone Point Set Screw (2)
30127 3C Spindle Key Way Set Screw
30128 3C Spindle “End Cap”
37160 Rotary Table Preload Nut
43234 3C 1″ Multi-Wrench
40520 10-32 x 3/16″ Cup Point Set Screw
30129 5-40 x 1/8″ Cup Point Set Screw
40580 Spindle “Tommy” Bar

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.


We do not charge a flat rate for shipping because of the variations in weight for our products. Instead, we charge you what the shipping company charges us. Our website uses a shipping calculator based on the daily rates for USPS and UPS based on the weight and destination of the shipment. You can also have us use your UPS/FedEx account number to charge your shipping. Just enter it in the appropriate box on the checkout page.

Domestic orders are shipped Monday – Friday. Expedited orders must be placed by 9 am PST to ship the same day.

Orders shipping ground have a processing time of 7 working days for domestic orders and 14 working days for international orders. CLICK HERE for more information on our shipping and order policies.


Most merchandise can be returned within 30 days of the purchase date. A refund will be issued to the original form of payment at the original selling price. View our complete return policy and/or start your return online here.