Dormer Taper Pin Hand Reamer, Conical Square Drive, Series: B301, Taper Pin Size/Number: 11/64 in, 3.97 mm Dia Reamer, 3.23 mm Small End Diameter, 89 mm Overall Length, Square Shank, 4.42 mm Shank Diameter, 4 Flutes, Straight Flute, 57 mm Flute Length, HSS, Bright/Steam Oxide, Right Hand Cutting Direction, Applicable Materials: Alloy Steel/Aluminum/Brass/Bronze/Carbon Steel/Cast Iron/Copper/Copper Alloy/Free Machining Stainless Steel/Hardened Steel/Magnesium/Nickel/Thermosetting Plastic/Titanium/Titanium Alloy

• Straight flute reamers are the most common and used in general purpose though-hole applications
• Designed to convert a straight hole into a tapered hole into which standard taper pins will fit
• The square on the shank is suitable for holding a tap wrench or vise, depending on whether the reamer or part is rotating, making them ideal for hand use
• Steam tempering gives a strongly adhering blue oxide surface that acts to retain cutting fluid and prevent chip to tool welding, thereby counteracting the formation of a built-up edge
• Steam tempering can be applied to any bright tool but is most effective on drills and taps
• +0.0050 tolerance

• https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/Union_Butterfield_1010845_Catalog.pdf https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/Union_Butterfield_1010845_Catalog.pdf