Internal wrenching nut

Internal wrenching nut

Cut-away view of an internal wrenching nut

An internal wrenching nut, (also known as an Allenut^[1] or Allen nut), is a cylindrical nut that is internally threaded on one side and has an Allen socket on the other side; the outside of the nut is smooth or has knurling on it.

The Allen socket may be 6 point or 12 point (also known as a double hex socket). They are used where hex or square nuts won't fit.^[2]

References

Notes

1. Holo Krome catalog (PDF), retrieved 2008-11-28.
2. Smith, p. 110.

Bibliography

• Smith, Carroll (1990), Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook, MotorBooks/MBI Publishing Company, ISBN 0879384069.