Saturday, October 18, 2014


Screw...  This is a high quality wood screw, nickel-plated high tensile strength steel, at about 20x.  These are what Nest supplies with its “Protect” fire/smoke/carbon monoxide alarms.  Note the asymmetrical raised threads: one of them is higher and sharper than the other.   Those were new to me, but I discovered they're called “high-low” threads, and provide several desirable characteristics for this sort of use.  In particular, they're easier to screw in (I can attest to that) and harder to pull out – nice combination!

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