Guy,
You need to get out more. This is way more knowledge than anyone should have
about threads.
Guy wrote:
> FWIW -
> BSP threads - British Standard Pipe are the same, size for size as
> BSTP threads - British Standard Taper Pipe.
> !/2" BSTP and 1/2" BSP are both 14 tpi and have the same thread depth
> (0.0457") and face angles (271/2 degs.)
> The difference is that the BSTP is machined at a 1:16 taper. BSP is a
> parallel thread.
> The nominal diameter is measured at a distance from the narrower end equal
> to the diameter, so a 1/2" plug is one that measures 1/2", 1/2" from the
> small end.
>
> Got that? (gg)
>
> Guy
> UK
>
> -----Original Message-----
> From: Bill & Cindy <fatboy@metro.net>
> To: spridgets@autox.team.net <spridgets@autox.team.net>
> Date: 11 February 1999 01:37
> Subject: Re: Pipe thread thread
>
> >At 11:48 AM 2/10/99 -0800, you wrote:
> >>
> >>".....I'm pretty sure I checked the threads with a thread gauge before
> >>I replaced
> >>the differential plugs with the Ford ones, but now you
> >>have got me curious and I'm gonna check 'em again... next time I run
> >>across the old ones in my junk box.
> >>
> >>
> >>Bill & Cindy
> >>Santa Rosa, CA "
> >>
> >>Please advise when you have your results on the axle plug threads. I
> >>like to replace about any threaded part or fastener when I diassemble
> >>something on an older car, so I'd like to know which pipe-threaded
> >>parts I can replace at the local hdwe store.....
> >>
> >>Thanks -
> >>
> >>MD
> >
> >
> >Michael,
> >
> >I found the old differential plugs that I removed from our 69 MKIV Sprite.
> >
> >They are a tapered thread plug with 14 threads per inch. The roots of each
> >plug measures approximately .781" and 792". The crowns of each plug measure
> >approximately .834" and .840".
> >
> >Now...reference data indicates that both USP and BSP 1/2 pipe is 14TPI.
> >Same data also states that a 1/2 BSP diameter is .825"...how they establish
> >a nominal diameter for a taper is unknown to me.
> >
> >Back to the real world. Are the original plugs BSP or USP? I dunno? Do know
> >that the USP ones fit and do not leak.
> >
> >As a final thought on the matter...Lindsay Porter does not state in his "MG
> >MIGDET & AUSTIN-HEALEY SPRITE Purchase and Restoration Guide" page 295,
> >that the differential plugs are 1/2 BSP ...as a matter of fact...he doesn't
> >reference them at all!
> >
> >So...I guess the question remains unanswered.
> >
> >How 'bout it list...jump right in here and help me confuse the matter even
> >more.
> >
> >>
> >>
> >>
> >>_________________________________________________________
> >>DO YOU YAHOO!?
> >>Get your free @yahoo.com address at http://mail.yahoo.com
> >>
> >>
> >Bill & Cindy
> >Santa Rosa, CA
> >
> >98 Sea Ray 190 BR
> >96 Yellow Lab
> >94 Ford F150 4x4
> >91 Tioga Montara
> >72 Midget parts car
> >69 Sprite driver
> >Assorted teen-agers
> >
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