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Identify this screw
02GF74 - 23/9/17 at 07:56 PM

From what info I can find seems to be no. 6 unc, as below

An 7/64 Allen key fits, I measure diameter to be 3.5mm and 7.5mm long. Thread is coarse so definitely not metric.

It is from a US made amp. .

[Edited on 23/9/17 by 02GF74]

gremlin1234 - 23/9/17 at 08:08 PM

first guess would be 2BA

do you have a photo of it? (preferably with a scale)

David Jenkins - 23/9/17 at 08:46 PM

I doubt that you'd find a 2BA in a US amp. More likely to be UNC or one of their numbered screw sizes (e.g. 8x32, 10x24, or something like that).

BTW: BA sizes are specified in metric units, despite being a bit of a UK antique range. For example, 0BA is the same as M6 coarse.

gremlin1234 - 23/9/17 at 09:03 PM

quote:
Originally posted by David Jenkins
BTW: BA sizes are specified in metric units, despite being a bit of a UK antique range. For example, 0BA is the same as M6 coarse.

they are very similar, but the profile is slightly different

rusty nuts - 24/9/17 at 06:52 AM

A set of thread gauges and a Zues booklet cost very little and last a lifetime , takes all the guesswork out when identifying threads.