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Precision Low-Backlash Boring Heads
Precision boring heads with controlled dovetail fit, low backlash, and H6-tolerance boring bar mounting bores for repeatable adjustment and accurate bar location.
Key Features
- Low-backlash fine adjustment: adjustment backlash controlled to 3 dial graduations or less.
- Precision dovetail fit: fit tolerance controlled to less than 0.03 mm.
- H6-tolerance boring bar mounting bores: accurate bar location and high concentricity.
- Hardened and ground adjusting screw: smooth adjustment and long service life.
- Wide bearing surface maintains rigidity during offset boring.
- Available in 2", 3", and 4" head diameters.

Specifications
Item Head Diameter
(D)Overall Height
(H)Boring Bar Mounting Bore
(d1)Hole Center Distance Cross Hole Dia.
(d2)Offset Net Weight Mount Thread 0350-0002 2" 2-1/2" 1/2" 5/8" 1/2" 5/8" 1.55 lb 7/8"-20 0350-0003 3" 3-5/32" 3/4" 15/16" 3/4" 1" 4.4 lb 1-1/2"-18 0350-0004 4" 3-43/64" 1" 1-1/4" 1" 1" 8.8 lb 1-1/2"-18 All dimensions are in inches unless noted. Net weights are approximate.
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