2.3125 Mounting Diameter

External Double Hex Broaches




Nominal Size (in) B Part #
11/16" External Double Hex Broach .681 1423-681
23/32" External Double Hex Broach .712 1423-712
3/4" External Double Hex Broach .743 1423-743
25/32" External Double Hex Broach .774 1423-774
13/16" External Double Hex Broach .805 1423-805
27/32" External Double Hex Broach .835 1423-835
7/8" External Double Hex Broach .866 1423-866
29/32" External Double Hex Broach .897 1423-897
15/16" External Double Hex Broach .929 1423-929
31/32" External Double Hex Broach .960 1423-960
1" External Double Hex Broach .991 1423-991


Nominal Size (mm) B Part #
18mm External Double Hex Broach .698 1423-698
19mm External Double Hex Broach .737 1423-737
20mm External Double Hex Broach .775 1423-775
21mm External Double Hex Broach .814 1423-814
22mm External Double Hex Broach .853 1423-853
23mm External Double Hex Broach .893 1423-893
24mm External Double Hex Broach .932 1423-932
25mm External Double Hex Broach .970 1423-970
26mm External Double Hex Broach 1.009 1423-1.009


Titanium Nitride (TiN)
TiN is a gold colored PVD coating made of exceptionally hard ceramic material that improves lubricity, increases hardness and enhances abrasive wear resistance leading to increased broach tool life.

Titanium Carbonitride (TiCN)
TiCN is a purple-gray colored PVD coating formed by the addition of carbon to the TiN formula. The elevated hardness and low residual stress lead to excellent abrasive wear resistance. TiCN coating also increases lubricity of the broach and performs well under high load conditions. TiCN is commonly used in medical and aerospace applications broaching small forms in stainless steel and titanium materials.

Titanium Aluminum Nitride (TiAIN)
TiAlN is a dark gray colored PVD coating that can be used in high temperature conditions and for better lubricity. Harder than TiN, TiAlN has excellent abrasive wear resistance and is used successfully to broach many materials such as titanium, aluminum, stainless steels, and alloy steels.


M2 High Speed Steel
M2 is a molybdenum based high speed steel that is characterized by abrasion resistance, toughness and good red hardness. Slater Tools' hardened M2 broaches have an ideal balance of bending strength, toughness and wear resistance. M2 is used in a wide range of rotary broaching applications and is suitable for any broachable material.  

PM M4 High Speed Steel
PM M4 is a molybdenum-tungsten high speed steel, which is produced with a very consistent and refined structure. This structure gives PM M4 broaches several enhanced properties including improved toughness and better wear resistance. This material is good for stainless steel and titanium applications for decreased wear.  


  • Custom Overall Lengths Available 
  • Custom dimensions
  • MICRO forms
  • Corner radius
  • Mounting slot can be aligned with form (for holding orientation)

External Broaching Part Preparation

Pre-Turn Diameter:

  • Pre-turning the diameter of the workpiece is required for external broaching.
  • The pre-turned diameter must be smaller than the major diameter of the broach.
  • It is recommended to turn the workpiece diameter to the smallest allowable diameter so the broach will clear on the major diameter. Allowing for more clearance will reduce the required broaching pressure and increase tool life.
  • See below formulas for recommended pre-turn diameters of hex and double-hex forms.

External Form Depth:

  • Maximum recommended broach depth is 1.5 x minor diameter of form.
  • A back-chamfer or undercut will allow chips to break cleanly. The undercut should be approximately .0625" wide.

Lead Chamfer:

  • A 45° lead chamfer must be provided for successful external rotary broaching, going from the minor diameter to the major diameter of the form.

Speeds and Feeds

Speeds and feed rates for rotary broaching will depend on the material you are broaching and size form. Please refer to the Slater Tools Speeds and Feeds Chart.