Internal ID Xpansion® Clamps

Product Description

Collets For Mill Applications – Internal ID Xpansion® Clamps

The ID Xpansion clamp is the ideal way to hold multiple parts on an inside diameter for multiple machining on a vertical machining center or a horizontal machining center

These machinable clamps are produced in 10 sizes and can hold internal diameters from under 3/16ths inches to over 4 inches. They use a heat-treated, tapered screw for expansion.

The flange diameter of the clamp is held to a close tolerance for precision locating in a machined pocket on work cubes and fixture plates.

The customer machines the mild steel clamp to match the bore of the part ensuring proper fit. Often times the clamps can be remachined for different size jobs.

One of the benefits of these low profile clamps is holding many lathe parts, for secondary machining, on one compact setup. They are quickly tightened with a hex key, torque driver or can be mated to hydraulic pull cylinders for automation.

Sub-Plate with multiple Xpansion® Clamps holding ID parts
  • Low Profile
  • Ideal for Secondary Operations on Lathe Parts
  • Easily Machined to Size on Lathe or Mill
  • Excellent for Palletized Setups
  • Allows More Parts Per Workcube or Fixture Plate
  • Heat-Treated and Coated Screw for Long Life
  • Clamp Body Made of Mild Steel for Machinability
  • Tighten with Hex Key or Hydraulic Pull Cylinders (Drill clearance hole for longer bolt into cylinder)
  • Made in U.S.A. by Mitee-Bite

Machining and Installation

  • Expand clamp approximately .002 over relaxed diameter and machine to fit workpiece bore, either on lathe or mill.
  • If machining the clamp on a lathe use the nut provided, on the back of the clamp, to tighten the tapered screw. This nut is used only to machine the clamp.
  • Range of expansion .008 to .020 depending upon size.
  • Machine a pocket, in the fixture, for the close tolerance “E” dimension and drill and tap mounting holes per “H” column. Drill and tap a hole from the “I” column in the center of the pocket for the tapered screw.
  • A recessed dowel pin may be installed into the flange for additional rigidity if required.

Internal ID Xpansion® Clamps Chart (Measurements in inches unless otherwise specified)

31000 # on .540 BHC2 – 56.160.5250
31050 # on .825 BHC8 – 32.303.6950
31100 # on .910 BHC1/4 – 20.5013.31900
31150 # on 1.140 BHC5/16 – 18.5627.62500
31200 # on 1.550 BHC3/8 – 16.7149.34500
31250 # on 1.790 BHC1/2 – 13.71120.05900
31300 #51.561.251.06.312.7361.651.1510-32 on 2.200 BHC5/8 – 11.79224.010,000
31350 #61.561.251.06.312.9722.031.1510-32 on 2.515 BHC5/8 – 11.79224.010,000
31400 #71.791.481.27.314.2323.061.151/4-20 on 3.646 BHC5/8 – 11.79224.010,000
31450 #81.791.481.27.315.2324.061.151/4-20 on 4.648 BHC5/8 – 11.79224.010,000
31500#91.791.481.27.315.2326.891.151/4-20 on 4.648 BHC5/8 – 11.79224.010,000
*31550#101.791.481.27.316.09.851.151/4-20 on 5.250 BHC5/8 – 11.79125.06,000

G+ Minimum diameter the “F” dimension can be machined or turned down to.
H* – (3) Mounting Screws Included.
*31550 – Clamp made from 7075-T6 aluminum stock.

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Internal ID Xpansion® Clamps


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