RH 55° and 80° 3/8″ Boring Bars w/Carbide Inserts

These 3/8″ diameter boring bars feature a carbide insert secured with a Torx® screw and come complete with a Torx wrench. Choose between:

• A 55° right-hand insert, suitable for starting holes as small as 3/4″, ideal for reaching sharp internal corners

• An 80° insert, which fits into a smaller 1/2″ hole and offers added strength for roughing operations

Each holder measures 3-1/4″ long and can bore to a depth of just over 2″ when properly secured with two set screws. Manufactured from durable 1144 Stressproof® steel with a black oxide finish, these tools are available individually or as a discounted set.

Why Choose Carbide Insert Tools?

While high-speed steel (HSS) remains common for small machine tools due to its low cost and resharpenability, carbide inserts offer significant advantages in demanding applications:

• Longer-lasting edges when cutting hard metals like stainless steel, titanium, or abrasive materials such as carbon fiber

• Faster cutting speeds and greater efficiency

• Each insert can be rotated 180°, effectively giving you two cutting edges per insert

Although carbide inserts can’t be resharpened, their durability and versatility make them a preferred choice in professional machine shops.

Note: The older straight-groove chip breaker insert is no longer available. Current inserts include the spider web-style chip breaker, as shown in the updated images here & here