john banks

As title. Dull but true. News to me, but I'm sure not to anyone that actually had a clue about fittings which may as well be voodoo to me. Very irritating to end up with the wrong stuff.

What sort of ****t*@t came up with the BSP system?

I thought with my micrometer in hand I could conquer the world

chocolate_o_brian

iTrader: (22)

Strange I know. As a mechanical apprentice I'm inundated with these fitnents and trying to remember them! BSP, BSW, BSF, BSC, ABC, XYZ... Do my bloody head in

wayne9t9

British standard pipe is measured at the bore. The other threads are for bolts.

alcazar

iTrader: (2)

As above. Dead easy to remember, why else would it be called a "pipe" thread?

CrisPDuk

The BSP system is simplicity itself to understand, your problem I suspect lies elsewhere

In a nutshell: A BSP thread suits the outside diameter of a given nominal bore pipe size. This is because, back in the day, an outside diameter much was easier to keep consistent during manufacture than a bore.

Also, when working on a site installation, it's much easier to cut a male thread on lengths of pipe, then join them with pre-made cast and machined female unions

CrisPDuk

Where the hell are you working that you still use Whitworth and BSF thread sizes

chocolate_o_brian

iTrader: (22)

Scunthorpe steelworks as an apprebtice

Good job I'm fluent in metric AND imperial

Was working on a job on Monday off a master drawing dated 5.3.37

CrisPDuk

Didn't know Scunny still had a steelworks, or that they were still in the 19th century

I only have to know metric, and occasionally American, threads these days. Makes life far simpler

chocolate_o_brian

iTrader: (22)

Yep, still going. Approx 3,500-4,000 of us currently out of an 80,000ish population

1937 is the twentieth century

As said, we work off lots of old machinery but modified, hebse old master drawings. I'm sure you know the drill

Chip

You mean imperial then?

Chip

scooby red

iTrader: (2)

American threads different again. UNC and UNF spring to mind. What ****e i was taught as an apprentice!!

chocolate_o_brian

iTrader: (22)

vindaloo

I've been playing with building a router and saw table the past couple of weeks. Some threads appear to be BSW?!? Try figuring out what size spanner to use on a BSW nut or bolt or setscrew.... As apparently the head sizes were reduced in WW2 to save metal and they've never reversed that decision!

I've decided to stick to M6 and M8 if possible appart from any yank stuff that's pretty much self contained anyway.

J.

bootsy

alot of hydraulic pipes are still made up in imperial.i uses most days 5/8,3/4 and 1"

Chip

In the gas industry all the new type PE pipes are metric but the old cast and ductile iron pipes are imperial and with any steel pipes are with the ID up to 12" and the OD above 12".

Leslie

We should have kicked all this metric rubbish into touch! It was easy to understand before then.

Les

Chip

I still think in imperial measures anyway Les whether it's metric or not.

Chip

chocolate_o_brian

iTrader: (22)

My school year was the last of phasing out imperial and phasing in metric so I learnt both. Some of the younger apprentices only learnt metric at school so 16/32/64 or thou is very strange to them, coming from a 20s/30s mill

dunx

iTrader: (3)

No-one's mentioned NPTF yet

raz6589

Its all feet and centimetres to me.