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1076C Electroless Nickel-Boron Coated 4-Jaw Chuck (3.1″)


3.1″ dia. Electroless Nickel-Boron Coated 4-Jaw Self-Centering Chuck (includes 2 tommy bars, not pictured).
See below for more information regarding Electroless Nickel-Boron Coating.

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SKU: 1076C Categories: ,

Product Description

1076C Electroless Nickel-Boron Coated Chuck

This chuck is identical to P/N 1076 except for an electroless nickel-boron coating that has been applied to help prevent wear and corrosion. This special coating has been applied to all external and internal surfaces of the chuck (except for chuck jaws), significantly improving the life of the chuck. This chuck also opens and closes more smoothly due to the lubrication properties of nickel-boron.

  • Ductile plating with columnar structure
  • Harder than any other nickel-based coating
  • Coating uniformity that eliminates post-plate grinding (or burnishing)
  • Wear properties overall superior to hard chromium
  • Hardness (68-72 Rc)
  • Low coefficient of friction (.044) Teflon™ is .04
  • Uniform coating thickness up to .004”
  • Accepts dry film lubricants

Jaw Options

  • For those who have jobs where speed and ease of use are more important than maximum accuracy and want a chuck that is loose right from the start (No extra charge).
    Add the note “loose jaws” to the “comments/shipping instructions” box when checking out.
  • Soft (unhardened) steel jaws are also available upon request (No extra charge).
    Add the note “soft jaws” to the “comments/shipping instructions” box when checking out.
  • Interchangeable top jaws are also available.

How to Distinguish between Standard Chucks and Coated Chucks

Some of our customers have been wondering how to tell the difference between our standard chucks and those that have the electroless Nickel-Boron coating. Standard chucks have darker markings than the coated chucks (See Figure 1. Click on photo to view a larger image).

Figure 1—Examples: (Left) 1040 3-Jaw Chuck (3.1″), (Right) 1040C Electroless Nickel-Boron Coated 3-Jaw Chuck (3.1″).


Here, at Sherline Products, each of our chucks is laser engraved with a company mark, chuck size, and jaw location. During the laser marking process the laser removes a bit of the surface and darkens the material below (Figure 1, left). When chucks are sent out to receive the Nickel-Boron finish the coating process changes the dark engraved markings to a noticably lighter finish (Figure 1, right).

There is also a subtle change in the color of the chuck, but in the absence of being able to compare them side by side, the most evident way to tell whether you have a coated chuck, or not, is to check the color of the laser markings.


Other Purchasing Options:

1076C-Pie 4-Jaw Self-Centering Chuck with Pie Jaws (3.1″)
1030 4-Jaw Independent Chuck (3.1″)
4058 Spindle Bar Grips

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 Instructions

Instructions PDF Download

Chuck Diameter 3.1″
Jaw Capacity With jaws in normal position: 3/32″ (2mm) – 1-1/2″ (38mm)

With jaws in reverse position: 3/32″ (2mm) – 2-3/4″ (70mm)

Through Hole Diameter .687″ (17mm)
Thread Size 3/4-16
Chuck Body Material 12L14 Steel
Chuck Jaws Material 12L14 Case Hardened Steel
Coating (#1076C only) Electroless Nickel Boron (#1076C only)

Because chuck jaws are factory ground to precisely match each chuck body all replacement orders must be made by phone.