5/16" is just slightly smaller than an 8 mm metric bolt, and should work. You
can also drill the hole in the clamp out a bit and use a larger bolt. Here in
New Mexico, where the wind is always blowing (we call it a breeze even if it's
40 mph) I have had multiple Yaesu bolts fail. I now use a grade 8 bolt that is
the next size up from 5/16".
Lee, KI7UR
Lee K. Brown MD
Emeritus Professor of Internal MedicineDivision of Pulmonary, Critical Care,
and Sleep MedicineUniversity of New Mexico School of MedicineAssociate Editor
and Founding Editor (“Emerging Technology”), Journal of Clinical Sleep
MedicineCo-editor, Section on Sleep and Neurobiology, Current Opinion in
Pulmonary MedicineChair, New Mexico Advisory Board for Respiratory CareChair,
Polysomnography Practice Advisory Committee of the NM Medical Board
On Tuesday, October 1, 2024 at 04:08:38 PM MDT, john@kk9a.com
<john@kk9a.com> wrote:
Some people are against pinning a mast however Yaesu rotator clamps are
designed with a bolt through the mast. I followed the manufacture's method
at my windy P40A station and never had a rotator issue. If I recall, Yaesu
uses an 8mm socket head cap screw. and I believe they call for a Ø9mm hole
50mm from the end of the mast.
John KK9A
Ed Stallman N5DG wrote:
I'm using the rotor turning a 6m 30ft boom. It has slipped at the
rotator from Hurricane Beryl . I would like to pin the mast , not
having the manual , what diameter bolt is needed ?
Thanks Ed N5DG
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