Precision Low-Backlash Boring Heads, 2", 3" & 4"

Accusize Industrial ToolsSKU: 0350-0002 UPC / Barcode: 663566002064

Size: 2" (0350-0002)
Price:
Sale price$84.95

Precision low-backlash boring heads with controlled dovetail fit and H6 bar mounting bores. Match the holder thread and boring bar shank to the selected head.

≤ 3 graduationsAdjustment backlash
< 0.03 mmDovetail fit tolerance
H6Bar mounting bore tolerance
2 / 3 / 4 in.Head diameters

The adjustment mechanism

See how the fine adjustment is controlled.

A hardened and ground adjusting screw provides smooth adjustment and long service life. Adjustment backlash is controlled to three dial graduations or less.

0350-0002 ground adjusting screw and actual dial, 0.001 in. per division; backlash at most 3 graduations

Read the body reference mark

The dial is shown with part of the head so the reading position stays clear.

Check the selected model

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.

Distinguish the specifications

Dial graduation and reversal backlash describe different aspects of adjustment.

Working interfaces

Controlled dovetail fit. Accurate bar location.

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.

0350-0002 dovetail fit below 0.03 mm and H6 bar bores

Select by the working dimensions

Compare the three boring heads.

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

Boring head dimensions: D head diameter, L overall height, d bar bore and cross-hole diameter
D = head diameter · L = overall height · d = bar bore / cross-hole diameter. Dial marks in this dimensional sketch are schematic; use the actual-model dial photographs above.
Specification0350-0002
2" head
0350-0003
3" head
0350-0004
4" head
Head diameter2"3"4"
Overall height2-1/2"3-5/32"3-43/64"
Boring bar mounting bore1/2"3/4"1"
Hole centre distance5/8"15/16"1-1/4"
Cross-hole diameter1/2"3/4"1"
Max. offset5/8"1"1"
Head-mount thread7/8"-201-1/2"-181-1/2"-18
Dial graduation (in. / division)0.0010.00050.0005
Net weight1.55 lb4.4 lb8.8 lb
Radial travel per division (in.)—0.00050.0005
Bore diameter change per division (in.)—0.0010.001

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

Three parts to match before machining.

01 / HEAD

Select the boring head

Use the comparison table to check head diameter, mounting bore, mount thread and maximum offset.

02 / HOLDER

Match both interfaces

The head side must match the mount thread. Choose the machine side for the spindle or toolholding system.

03 / BORING BAR

Match the bar shank

Select a compatible shank diameter, then choose bar length and cutting geometry for the work.

Full-series compatibility guide

Boring head, holder & bar compatibility

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.

Compatibility chart linking 2, 3 and 4 inch boring heads to their matching threaded holders and boring bar sets
Open full-size compatibility chart

Auxiliary tools / sold separately

Compatible with 2" head 0350-0002

Holder mount: 7/8"-20. Boring bar shank: 1/2". Select the SKU link to open the matching store variant.

Boring head holders

Boring bar sets

Common setup questions

Before selecting your tooling.

What is the dial graduation for each head?

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.

What does “three dial graduations or less” describe?

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.

Do all three heads use the same holder?

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.

Which boring bar diameter fits each head?

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.

Does maximum offset specify the finished bore range?

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.

Are the holder and boring bar sets included?

Select the head, holder and boring bar set separately using the compatible options listed on this page.

08 / PRODUCT RESOURCES

More for your setup.

Catalogue P89 — head dimensions (PDF) ↗

California Proposition 65 Warning

Warning LabelWARNING: This product may contain materials and/or chemicals such as arsenic, lead, and others that are known by the state of California to cause cancer and/or reproductive problems.
For more information, visit www.P65Warnings.ca.gov

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