Prevailing torque locknut
A prevailing torque locknut having a nut body, a locking band, and a retainer. The nut body includes a threaded portion and an unthreaded counterbore. The locking includes a coil portion and first and second tangs extending tangentially from the coil portion. The locking band is located within the counterbore, and the first and second tangs engage the counterbore sidewall to prevent relative rotation of the locking band within the nut body. The retainer is swaged into the nut body to secure the locking band within the nut body.
1. A prevailing torque locknut comprising:
a nut body having an internally threaded portion and an unthreaded counterbore having a sidewall comprising an uninterrupted cylinder; and
a locking band within the counterbore, the locking band including a coil portion and first and second tangs extending outwardly beyond the coil portion, the locking band disposed within the counterbore, the first and second tangs engaging the sidewall of the counterbore, whereby the engagement of the first tang with the sidewall prevents relative rotation of the locking band and the nut in a first direction, and further whereby the engagement of the second tang with the sidewall prevents relative rotation of the locking band and the nut in a second opposite direction.
2. The locknut of claim 1 wherein the first and second tangs have ends that are sharp to bite into the uninterrupted cylindrical sidewall to prevent each tang from moving in one direction with respect to the nut body.
3. The locknut of claim 1 wherein the first and second tangs extend tangentially from the coil portion of the locking band.
4. The locknut of claim 1 further comprising a retainer secured within the nut body, the locking band located between the threaded portion and the retainer.
5. The locknut of claim 4 wherein the nut body includes a deformed shoulder securing the retainer within the nut body.
6. The locknut of claim 1 wherein the pitch of the locking band is no greater than the pitch of the threaded portion of the nut body.
7. The locknut of claim 1 wherein the retainer defines a central aperture having a diameter corresponding to the diameter of the threaded portion of the nut body.
8. A prevailing torque locking fastener comprising:
a fastener body having a threaded portion and an unthreaded counterbore having a sidewall comprising an uninterrupted cylinder; and
a locking band including a coil portion and first and second tangs extending from the coil portion, the locking band located within the counterbore, the first and second tangs engaging the counterbore sidewall to prevent relative rotation between the locking band and the fastener body in either direction.
9. The locking fastener of claim 8 wherein the first and second tangs have ends that are sharp to bite into the uninterrupted cylindrical sidewall to prevent each tang from moving in one direction with respect to the fastener body.
10. The locking fastener of claim 8 wherein the first and second tangs extend tangentially from the coil portion.
11. The locking fastener of claim 8 wherein:
the engagement of the first tang with the sidewall prevents the relative rotation in a first direction; and
the engagement of the second tang with the sidewall prevents the relative rotation in a second direction.
12. The locking fastener of claim 8 further comprising a retainer secured within the fastener body to secure the locking band within the fastener body.
13. The locking fastener of claim 12 wherein the fastener body is deformed to secure the retainer within the fastener body.
14. The locking fastener of claim 12 wherein the retainer defines a central aperture having a diameter corresponding to the diameter of the threaded portion of the fastener body.
15. The locknut of claim 8 wherein the pitch of the locking band is no greater than the pitch of the threaded portion of the fastener body.