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Door closer locator thread

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Vortex O'Plinth
Posts: 838
Joined: Fri Feb 12, 2016 8:15 pm
Location: Gloucestershire

Re: Door closer locator thread

Post by Vortex O'Plinth » Tue Oct 08, 2019 10:55 am

daimlersteve wrote:
Tue Oct 08, 2019 9:51 am
Anyone --- Thread ?
As well as UNC and UNF the Unified thread system also specifies UNS (special) threads for use where the other sizes are not acceptable. The finest standard pitch for a 3/4" UNS is 27 tpi. If your thread is definitely 28 tpi then it could be from the Unified constant pitch series. These threads, specified as UN, are based on pitches 4, 6, 8, 12, 16, 20, 28, and 32 tpi and apply to a range of diameters, including 3/4". These are used in applications where the design considerations exclude the other series.

By the 1950's the Unified series fasteners were in almost exclusive use in the motor and other industries, so a probable match for your thread would be 3/4"-28 UN. As for all Unified threads the flank angle is 60°.
Nick

"Open the pod bay door Hal".

daimlersteve
Posts: 354
Joined: Wed Mar 09, 2016 11:20 am

Re: Door closer locator thread

Post by daimlersteve » Tue Oct 08, 2019 8:46 pm

beauty, thanks Nick .

daimlersteve
Posts: 354
Joined: Wed Mar 09, 2016 11:20 am

Re: Door closer locator thread

Post by daimlersteve » Thu Oct 10, 2019 8:24 am

Took the sample along to my local machinist. No problem , close enough to 0.9 mm pitch . He'll thread up a 100 mm piece of brass at each end and i'll machine up the rest .
cheers, Steve

Zbigmak
Posts: 38
Joined: Sun Nov 19, 2017 10:45 pm
Location: Warsaw Poland

Re: Door closer locator thread

Post by Zbigmak » Sun Oct 13, 2019 7:11 pm

Can anyone post some pics of a disassembled unit please.
Many thanks George

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