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Drill size hole for BSP tap

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Drill size hole for BSP tap

Post by Locknut on Mon Apr 07 2014, 12:48

Hi All,
I am wanting to use a 1/4'' bsp tap,could anyone kindly let me know what size hole I need to drill?
Thanks.
Kev.

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Re: Drill size hole for BSP tap

Post by matt86 on Mon Apr 07 2014, 14:10

Il have a look in my zeus book later and get back to you.

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Re: Drill size hole for BSP tap

Post by Locknut on Mon Apr 07 2014, 15:13

Hi Matt,
Thanks for that.What is a zeus book?
Kev.

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Re: Drill size hole for BSP tap

Post by Villiers on Mon Apr 07 2014, 16:05

A Zeus book is a book with all drill and tap sizes in it, bit like a reference chart. What are you planning to drill? A hole is the wrong answer.

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Re: Drill size hole for BSP tap

Post by Locknut on Mon Apr 07 2014, 16:48

Ah so that is what a zeus book is - thanks for that.
I am restoring a Lister D - where the water drain tap should have been someone has shoved (hammered) a chunk of wood in - I got the wood out only to find that the threads have been badly damaged - looks like a file or something had been taken to them.I think the thread should originally have been 1/8 bsp - this tap just rattles around in the hole  the next size up is,I think, 1/4 bsp - this tap doesn't quite fit so I will have to enlarge the hole and retap - hence my question.Am I right in my thinking or is there another way to deal with this problem?Thanks.
Kev.

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Re: Drill size hole for BSP tap

Post by Villiers on Mon Apr 07 2014, 17:05

Ah! In that case you are buggered as the hole with the wood in is 1/4, next size up will be 3/8, that is if it is the standard drain point on a D, might be easier to remove the old bush and start again, it's 1inch BSP so fittings are out there.

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Re: Drill size hole for BSP tap

Post by Locknut on Mon Apr 07 2014, 17:26

Ah! Thanks for that - these things are sure sent to try us!
I have a 3/8 bsp so might try that - what drill size would I need for this?
Thanks.Kev.

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Re: Drill size hole for BSP tap

Post by Villiers on Mon Apr 07 2014, 21:05

19/32

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Re: Drill size hole for BSP tap

Post by Matth92 on Mon Apr 07 2014, 21:30

That's 15.25 mm for those in the 21st century, which is a bit of an uncommon size, but a 15mm dia hole would probably work OK without too much trouble

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Re: Drill size hole for BSP tap

Post by kevjhnsn on Mon Apr 07 2014, 22:27

Matth92 wrote:That's 15.25 mm for those in the 21st century, which is a bit of an uncommon size, but a 15mm dia hole would probably work OK without too much trouble
easy to source 
try screw fix web catalogue 15.2 or maybe even spot on to the 15.25mm ,my last order seam to remember they were in 5ths of mils,
.2,.4,.6, .8mm, not the !/4s as spot on says in the zeus engineers bible of measuring drilling and boring shapening angles and on and on ,every good garage should have one even more so if you use a lath as even a cutting speed chart for metals and alloys 
quility is not always the best but for a couple of holes into cast will be no issues 
and delivered to you door sharpish too
kev

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Re: Drill size hole for BSP tap

Post by kevjhnsn on Mon Apr 07 2014, 22:46

if zeus dont have the answers this one for threads usualy covers it

maybe a few messages to get it on with

1 of
[size=undefined]A Compilation of Thread Size Information[/size]

 

Key:


BA = British association. CEI = Cycle Engineers Institute. ADM = Admiralty. M = ISO Metric. 
Whit = Whitworth. UNF/UNC = Unified national Fine/Coarse. BSF = British Standard Fine. 
W.INS = Whitworth Instrument. W.Pipe = Whitworth Pipe Thread Brass = Brass thread.
PROG = Progress Thread. BSP = British Standard Pipe Thread. WALTH = Waltham Thread
PEND = Watch Pendant Thread. GAS = Gas (Brass Pipe) Thread THURY = Swiss Screw Thread. 
ASME = ASME Thread. HOLTZ= Holtzapfels Threads. LOEW = Loewenhertz Threads.
SPARK = Spark Plug Threads. Elgin = Elgin watch screw threads (L = left hand thread) 
CROWN = Watch crown threads. BUTTON = Watch button threads
COND = Steel conduit thread (DIN 40430)
DUNLOP = Tire valves.
EDISON = Lamp socket thread
V = Sharp V thread
S&H = Siemens & Halske





1.Watch threads may be manufactured with a 45º, 50º or 60º thread angle. 45º commonly used in soft brass.
2Unified screw threads (UNC, UNF, UNS) replaced the old USS and SAE threads used before unification of
screw threads between the UK, US and Canada. The United States continued using 1/2 USS and 1 SAE
for standard nut and bolt production.

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Re: Drill size hole for BSP tap

Post by kevjhnsn on Mon Apr 07 2014, 23:00

its going to take to long to post sorry ,liking like over 30-40 posts to get it on here
sorry kev
p.s but if you ever find a odd sized thread or stud/nut thread ,micromitor it over to me and number of theads to the 1cm or inch and see what i can id for you from  the thread tittles as above message
there much be well over 500 on the list i have from 0.0100" / 0.254mm at 400tpi upto 6.5" / 165.10mm at 2.309 tpi
kev

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Re: Drill size hole for BSP tap

Post by Villiers on Tue Apr 08 2014, 06:51

[quote="Matth92"]That's 15.25 mm for those in the 21st century, which is a bit of an uncommon size, but a 15mm dia hole would probably work OK without too much trouble[/quote]

Can't use metric for imperial thread... Just not done old boy.

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Re: Drill size hole for BSP tap

Post by Bamfordlad on Tue Apr 08 2014, 07:31

Google is a great friend, ask the question and you get the answer.
try this answer http://www.motalia.com/Html/Charts/bsp_chart.html

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Re: Drill size hole for BSP tap

Post by NoelA on Tue Apr 08 2014, 08:55

Hi if you want to thread repair it/helicoil I have tap and insets in 1/4 1/2 bsp and 18mm spark plug thread if any body would like to borrow your welcome just pay for the inserts and postage of tap. If you break the tap you would have to cover cost.
Noel


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Re: Drill size hole for BSP tap

Post by Locknut on Tue Apr 08 2014, 16:33

Hi Guys,
Thanks for all your very useful and informative replies - it never ceases to amaze me just how much knowledge people on this site have - and are prepared to share.It is truly a friendly site/community.
Kev.

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Re: Drill size hole for BSP tap

Post by AnotherBigAl on Wed Apr 16 2014, 20:15

Tracy Tool is Devon will supply just about any size of drill, tap or die for you.

Tracy Tools

Just to confirm, I have no contact other than a very being a happy customer.

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Re: Drill size hole for BSP tap

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