Hanson Carbon Steel Bottom Tap 4-40 Thread

Product #: 910613 Hanson #: 1212 ZR UPC #: 20042526012123
$2.19

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Product Information

Hanson's high strength taps are useful for any number of machining projects, threading the interior surface of a hole to correspond with the desired thread pitch of a given screw, bolt or other part. This bottom tap has a very slight chamfer (tapered cutting edge) that is 1 to 2 threads in length, followed by a continuous cutting edge that enables the tap to cut threads to the very bottom of a blind hole. Lacking a proper taper to successfully start into an untapped hole, the bottom tap is best used for cleaning up or elongating existing threads. Featuring a square drive head, the tap can be paired with a Hanson T-handle tap wrench (Product #330-820, sold separately) for manual operation, or attached to a lathe or drill press for greater precision and speed.

For a complete list of available taps and associated drill bit sizes, please refer to the "Technical Specifications & Use" link below.

Technical Information

Tap Types and Suggested Uses:
  • Bottom tap has a chamfer (taper at the end) that is 1 to 2 threads long. Use for threading close to the bottom of blind holes.
  • Plug tap has a chamfer that is 3 to 5 threads long. The most common chamfer for use by hand or for machine tapping through blind holes.
  • Taper tap has a chamfer that is 7 to 10 threads long. Easier starting and requires less tapping torque because of the number of working teeth. Also known as a starter tap.

  • All taps have a square drive head. Size of square and overall length of tap will vary by tap size.


    Click Here for a Comprehensive List of Drill and Tap Sizes, along with pertinent dimensional details.
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