Select the boring head
Use the comparison table to check head diameter, mounting bore, mount thread and maximum offset.
The adjustment mechanism
A hardened and ground adjusting screw provides smooth adjustment and long service life. Adjustment backlash is controlled to three dial graduations or less.

The dial is shown with part of the head so the reading position stays clear.
0350-0002: 0.001 in. per division.
0350-0003 / 0350-0004: 0.0005 in. radial travel per division, corresponding to 0.001 in. bore diameter change.
Dial graduation and reversal backlash describe different aspects of adjustment.
Each division: 0.0005 in. radial slide travel = 0.001 in. bore diameter change.
Example: 10 divisions = 0.005 in. radial travel = 0.010 in. bore diameter change. Read at the body reference mark.
The adjustment mechanism
A hardened and ground adjusting screw provides smooth adjustment and long service life. Adjustment backlash is controlled to three dial graduations or less.

The dial is shown with part of the head so the reading position stays clear.
0350-0002: 0.001 in. per division.
0350-0003 / 0350-0004: 0.0005 in. radial travel per division, corresponding to 0.001 in. bore diameter change.
Dial graduation and reversal backlash describe different aspects of adjustment.
Each division: 0.0005 in. radial slide travel = 0.001 in. bore diameter change.
Example: 10 divisions = 0.005 in. radial travel = 0.010 in. bore diameter change. Read at the body reference mark.
The adjustment mechanism
A hardened and ground adjusting screw provides smooth adjustment and long service life. Adjustment backlash is controlled to three dial graduations or less.

The dial is shown with part of the head so the reading position stays clear.
0350-0002: 0.001 in. per division.
0350-0003 / 0350-0004: 0.0005 in. radial travel per division, corresponding to 0.001 in. bore diameter change.
Dial graduation and reversal backlash describe different aspects of adjustment.
Working interfaces
Dovetail fit tolerance is controlled to less than 0.03 mm. H6-tolerance boring bar mounting bores support accurate bar location and high concentricity. A wide bearing surface supports rigidity during offset boring.

Working interfaces
Dovetail fit tolerance is controlled to less than 0.03 mm. H6-tolerance boring bar mounting bores support accurate bar location and high concentricity. A wide bearing surface supports rigidity during offset boring.

Working interfaces
Dovetail fit tolerance is controlled to less than 0.03 mm. H6-tolerance boring bar mounting bores support accurate bar location and high concentricity. A wide bearing surface supports rigidity during offset boring.

Select by the working dimensions
Match the bar shank diameter and head-mount thread to your tooling. The highlighted column follows the selected head.

| Specification | 0350-0002 2" head | 0350-0003 3" head | 0350-0004 4" head |
|---|---|---|---|
| Head diameter | 2" | 3" | 4" |
| Overall height | 2-1/2" | 3-5/32" | 3-43/64" |
| Boring bar mounting bore | 1/2" | 3/4" | 1" |
| Hole centre distance | 5/8" | 15/16" | 1-1/4" |
| Cross-hole diameter | 1/2" | 3/4" | 1" |
| Max. offset | 5/8" | 1" | 1" |
| Head-mount thread | 7/8"-20 | 1-1/2"-18 | 1-1/2"-18 |
| Dial graduation (in. / division) | 0.001 | 0.0005 | 0.0005 |
| Net weight | 1.55 lb | 4.4 lb | 8.8 lb |
| Radial travel per division (in.) | — | 0.0005 | 0.0005 |
| Bore diameter change per division (in.) | — | 0.001 | 0.001 |
All dimensions are in inches unless stated. Net weights are approximate. Max. offset is the listed head offset, not a finished-bore diameter range. Radial travel and bore diameter change are stated for 0350-0003 and 0350-0004 only. A dash means the interpretation is not stated, not zero.
Build the setup
Use the comparison table to check head diameter, mounting bore, mount thread and maximum offset.
The head side must match the mount thread. Choose the machine side for the spindle or toolholding system.
Select a compatible shank diameter, then choose bar length and cutting geometry for the work.
Full-series compatibility guide
Follow the connections to match the holder thread and boring bar shank to each head. Compatible accessories for your selected head are listed below. Holders and boring bars are sold separately.

Auxiliary tools / sold separately
Holder mount: 7/8"-20. Boring bar shank: 1/2". Select the SKU link to open the matching store variant.
0538-0002Default Title ↗
0350-0105R8 Bridgeport (0350-0105) ↗
0350-01061/2" straight shank (0350-0106) ↗
0350-01073/4" straight shank (0350-0107) ↗
8505-4001Default Title ↗Auxiliary tools / sold separately
Holder mount: 1-1/2"-18. Boring bar shank: 3/4". Select the SKU link to open the matching store variant.
0355-0108R8 Bridgeport (0355-0108) ↗
0355-01141" Straight Shank (0355-0114) ↗
0536-0112Default Title ↗
0538-0304Default Title ↗Auxiliary tools / sold separately
Holder mount: 1-1/2"-18. Boring bar shank: 1". Select the SKU link to open the matching store variant.
0355-0108R8 Bridgeport (0355-0108) ↗
0355-01141" Straight Shank (0355-0114) ↗
0536-0112Default Title ↗
0538-0304Default Title ↗Inspect the details
Images follow the selected head. Select a photograph to enlarge it.
Inspect the details
Images follow the selected head. Select a photograph to enlarge it.
Inspect the details
Images follow the selected head. Select a photograph to enlarge it.
Common setup questions
The 2-inch 0350-0002 is marked 1 DIV. = 0.001 in. For 0350-0003 and 0350-0004, each division gives 0.0005 in. radial slide travel and 0.001 in. bore diameter change. Ten divisions give 0.005 in. radial travel and 0.010 in. bore diameter change. Read at the body reference mark.
It describes adjustment backlash when reversing the fine-adjustment mechanism. It is separate from the dial graduation and the dovetail fit tolerance. The arrow span in the illustration is schematic.
No. The 2-inch head uses a 7/8-inch-20 mount thread. The 3-inch and 4-inch heads use a 1-1/2-inch-18 mount thread. The machine-side connection must also suit the spindle or toolholding system.
Use 1/2-inch shanks with 0350-0002, 3/4-inch shanks with 0350-0003 and 1-inch shanks with 0350-0004. Compatible set SKUs are listed under Auxiliary Tools.
For 0350-0003 and 0350-0004, Max. Offset 1 in. describes the maximum lateral slide travel. It does not specify the finished bore range, which also depends on bar geometry, length, mounting position and the work setup.
Select the head, holder and boring bar set separately using the compatible options listed on this page.
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