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Old 17th March 2014, 01:02 PM   #1
mmp is offline mmp
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Join Date: Dec 2009
Default Bryston Screw

Hi to everybody,
My Bryston couple 0.5B + 2B has been repaired years ago (replacement of power cables, whose isolation tore-off in pieces) but the TINKER who did the work aesthetically damaged the robertson screws for lack of adequate tool.
I tried screws identical to the original, but it seems impossible to find here in Europe.
Please, someone can tell me the exact nomenclature of these screws, so it can look for them overseas on the web?
The outer diameter of the thread is 4.76mm (3/16" I suppose), so is the lenght of the threaded part. Total lenght is 9.5mm (3/8" ?). Flat head with Robertson insert (even the philips insert might be good). The pitch of the screw does not fit with local standard, I think may be UNC or UNF. Screw color = black.
Can anyone suggest me a link where to buy the screws ?
Thanks ! (also for your patience in reading my poor english)

P.S. As a first step, I mailed Bryston, they said that they would send me the screws, but nothing happened, and then no longer have responded my e-mails...
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Old 18th March 2014, 09:24 PM   #2
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Join Date: Dec 2010
Location: Paris, Ontario
They would be #6-32 x 3/8". Pictured is what I bought for my Brystons, they are allen key head.
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---Jason Kuetemann---
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Old 19th March 2014, 11:42 PM   #3
mmp is offline mmp
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Join Date: Dec 2009
Originally Posted by jkuetemann View Post
They would be #6-32 x 3/8". Pictured is what I bought for my Brystons, they are allen key head.
Thanks for the info, have proved very useful: now I understand the screw-gauge nomenclature.

I checked better: The power amp needs #6-32 x 3/8" pan-head type, or socket-head (I'll change all screws) - I found these items in Europe

The preamp needs #6-32 x 1/4" countersunk head type (more difficult to find here)
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