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2263-2264 55° and 80° LH 3/8″ Boring Bars w/Carbide Inserts


Carbide Insert 3/8″ Boring Bars (Each comes with a carbide insert, hold-down screw, and Torx wrench).
*NOTE: Picture shows the insert tool holders as a set (P/N 2272).
2263 (55° LH) $63.00
2264 (80° LH) $63.00
2272 (Set of both 55° and 80° LH holders) $99.75

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SKU: 2263-2264 Categories: ,

Product Description

About the Insert Boring Tool Holders

These 3/8″ diameter boring bars hold a carbide insert secured with a Torx screw.  Each comes with either a 2-sided  55° or 80° carbide insert and Torx wrench. The 55° LH boring tool will fit into a 3/4″ starting hole. The 80° holder will fit into a smaller 1/2″ hole. The 80° holder offers a little more strength for roughing cuts while the 55° insert will cut into sharper corners. The 3-1/4″ long holder can bore a hole a little over 2″ deep with two fastening screws tightened on it. The holders are made from 1144 Stressproof steel with a black oxide finish. Available individually.

*LH Boring Bars
NOTE: These LH boring bars are not intended to be used for boring on a standard Sherline lathe, as the spindle is not reversible without electronic modifications. They were developed for a Sherline tool that is now in development where they will be used as a turning tool from the back side with the bit upside down. Watch for the introduction of this new “chucker” lathe soon.

Advantages of Using Carbide Insert Tools
Though relatively expensive, if a cutting edge of a carbide insert becomes dull or chipped, the insert can be removed and rotated 180° to expose two new cutting surfaces, providing, in effect, two tools for the price of one.

The primary method of cutting metal on miniature machine tools is usually with high-speed steel tools as they are inexpensive, easily resharpened and can be ground into “form” tools for special jobs. However, inserted tip carbide tools can be lifesavers for some jobs. Though more expensive and not able to be resharpened, carbide tools hold their cutting edge when cutting exotic metals like stainless steel or titanium or abrasive materials like carbon fiber and can speed up the cutting process. This is why they are used for most cutting tasks in the modern professional machine shop.


Other Purchasing Options:

2259 80° RH Insert Boring Tool Holder
2260 55° RH Insert Boring Tool Holder
2261 Set of both 55° and 80° RH Insert Boring Tool Holders
7605 Replacement 55° Carbide Insert
7605B Replacement 55° Carbide Inserts (Box of 10)
7608 Replacement 80° Carbide Insert
7608B Replacement 80° Carbide Inserts (Box of 10)

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF 2259-2264 Instructions

Instructions PDF Download

Insert Holder Material 1144 Stressproof Steel
Body Coating Black Oxide
Insert Material Carbide
2263 LH 55° 3/8″ Boring Bar w/ carbide insert .15 lb. $63.00
2264 LH 80° 3/8″ Boring Bar w/ carbide insert .15 lb. $63.00
2272 Pair, LH 55° and 80° 3/8″ Boring Bar w/ carbide insert .25 lb. $99.75