Square Headstock w/Flat Base


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Spindle Options: 3/4-16 #1M taper or ER-16

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    Nickel/Teflon plating

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About the Headstock w/Flat Base

The Sherline industrial headstocks were developed based on the headstock used on the Sherline lathe and milling machine. The headstocks are made from extruded 6061-T6 aluminum and have a black anodized finish. They are available with your choice of a spindle (3/4-16 #1M taper or an ER-16*).

All Sherline Industrial spindles feature lifetime lubricated bearings with adjustable preload. The bearings are Class 5 for better accuracy, tighter tolerance, smoother and quieter movement, and cooler running. The bearings in all our industrial headstocks, except for the 3C headstock, are 6004-VV C3P5 – ABEC 5. The headstock bearings are rated for a continuous speed up to approximately 4,000 RPM with factory preload adjustment of .0002″. You may need a slightly looser preload setting of .0003” for operating speeds up to 10,000 RPM.

*NOTE: We do not sell the collets used with the ER-16 spindle. Those are available through MSC Industrial Supply Co. or other tool supply sources.

Standard Headstock Features

  • Two 1/4-20 mounting holes and an alignment key slot on the bottom of the base
  • Alignment key
  • Spindle bearing dust cover washer
  • ER-16 collet nut ships with the ER-16 spindle headstocks
Mounting the Headstock

The flat bottom headstocks have mounting holes and a keyway. The two 1/4-20 mounting holes provided in the bottom of the headstock are for mounting to your fixture or machine. A 3/16″ wide x .110″ deep slot is provided for a 3/16″ alignment key to aid in precisely locating your headstock.

Optional Nickel/Teflon Spindles

Most of our spindles are available with a Nickle/Teflon plating as a rustproof option for an additional cost. Check the option box above to add the Nickel/Teflon plating to your spindle order.

Spindle Precautions

These spindles should be considered light duty. A .405 (10 mm) through hole allows long stock to be passed through the spindle. This design provides a lot of versatility but was not intended for long or out-of-round parts to be rotated at high RPM. It is up to the operator to determine if the spindle and the setup are adequate and safe for the job being attempted.

The spindle is equipped with a dust cover, but it is not totally sealed. The presence of dust from grinding operations can shorten bearing life considerably. It was also not designed to be operated in a coolant bath. The spindle shaft should be shielded from coolant spray.

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 Square Flat-Base Headstock Instructions

Instructions PDF Download

Headstock Specifications
Spindle base size 3.0″ long x 2.11″ wide (76.2 mm x 53.6 mm)
Spindle case height 3.66″ (93.1 mm)
Spindle centerline height above table 1.75″ (44.5 mm)
Hole through spindle .405″ (10 mm)
Spindle nose thread (Models 6501, 6502) 3/4-16
Spindle nose internal taper (Models 6501, 6502) #1 Morse
Spindle nose thread and taper (Models 6503, 6504) ER-16
Bearings (2) 20 mm, class 5, lifetime lubricated ball bearings with adjustable preload
Runout at spindle nose 0.001″ (Most are within .0005″)
End play (factory preload adjustment) .0002″ (.0051 mm)
Recommended continuous spindle speed 4000 RPM or less
Maximum spindle speed 10,000 RPM
Mounting provision 2 holes, 1/4-20, 2″ (50.8 mm) between centers on part centerline
Alignment provision .188″ wide by .110″ deep slot, .468″ to side of spindle centerline for 3/16″ alignment key
Part No. Description Quantity
31080 10-32 x 3/8″ Flat Point Set Screw 1
40160 Preload Nut 1
40230 3/4-16/#1 Morse Spindle (used on P/N 6501, 6502) 1
40320 Bearing Dust Cover Washer 1
40330 10-32 x 5/8″ SHCS 1
40420 Class 5 Headstock Bearings 2
40440 #2 x 1/4″ Self-Tapping Phillips Head Screws 2
43230 2-Step V-Belt Pulley (used on P/N 6502, 6504) 1
65023 ER-16 Spindle (used on P/N 6503, 6504) 1
65026 ER-16 collet nut (used on P/N 6503, 6504) 1
65101 Industrial Headstock Case w/Flat Base 1

Click the P/Ns below to download a zipped version of the IGS 3D CAD file. You will need to extract the zip file before viewing the IGS file.
6523 3D IGS model
6524 3D IGS model
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