3.1″ 3-Jaw Chuck

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Product Description

This larger chuck takes up no more center-to-center space than the 2.5″ chuck, but it will hold larger work. It has a clamping range of 3/32″ (2 mm) up to 1-1/2″ (38 mm) diameter with the jaws in the normal position. With the jaws in the reversed position, work up to 3-1/4″ (82.5mm) can be gripped. The hole through the chuck is .687″ (17 mm). Rotating the knurled ring closes all three jaws simultaneously to grip round or hexagonal stock quickly. Tommy bars (provided) are used in the side holes to tighten and loosen the chuck for more leverage. The chuck has a 3/4-16 thread to fit Sherline’s spindle.

We offer a variety of jaws options including soft jaws, interchangable jaws made of different materials and pins jaws. To customize your chuck you can build your own chuck here.

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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.

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Always wear safety glasses when operating machine tools.

Download PDF 1040 Instructions

Instructions PDF Download

Chuck Diameter3.1″
Jaw CapacityWith jaws in normal position: 3/32″ (2mm) – 1-1/2″ (38mm)

With jaws in reverse position: 1/4″ (6 mm) – 3-1/4″ (82.5mm)

Through Hole Diameter.687″ (17mm)
Thread Size3/4-16
Chuck Body Material12L14 Steel
Chuck Jaws Material12L14 Case Hardened Steel
I.D. Holding diameter of jaws
NOTE: The diameters shown on the print can vary as much as .010-.020 depending on the amount of material that is removed during the grinding operation.
Click on the image for a larger view.
Part No.DescriptionQuantity
104013.1″ 3 Jaw Chuck Body *Not sold separately1
104023.1″ Chuck Scroll *Not sold separately1
10413Chuck Retainer Ring1
104143 Jaw Chuck Jaw*3
40580Tommy Bar2

*Because chuck jaws are factory ground to precisely match each chuck body you must send your chuck back to us to be fitted with new jaws. Please contact us for instructions on how to return your chuck.

Click the P/N 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.
1040 3.1″ 3-Jaw Chuck 3D IGS model
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