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1/4 - 20 threaded mounting holes

English translation: 20=number of threads per inch

05:54 Oct 6, 2006
English language (monolingual) [PRO]
Tech/Engineering - Electronics / Elect Eng / ring light
English term or phrase: 1/4 - 20 threaded mounting holes
"Black anodized aluminum housing with 1/4 - 20 threaded mounting holes."

...numbers are my problem in this sentence, ...holes with 1/4" diameter on one side and 20 (what) on the other side??

thanks!
Elena Ghetti
Italy
Local time: 22:46
Selected answer:20=number of threads per inch
Explanation:
Parts are indicated by their nominal diameter (the nominal outside diameter of the screw threads), number of threads per inch, and the class of the thread. For example, “.750-10UNC-2A” is male (A) with a nominal outside diameter of 0.750″, and 10 threads per inch; “.500-20UNC-1B” would be female (B) with a 0.500″ nominal diameter (i.e., the hole will be drilled less than that) and 20 threads per inch.

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Note added at 16 mins (2006-10-06 06:10:34 GMT)
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For further clarification, as redundant as it may seem, threads are either in the hole or on the screw; they are the fastening mechanism of the bolt, essentially. The "swirls" might be a way to describe them.
Selected response from:

Ioanna Karamanou
United States
Local time: 16:46
Grading comment
many thanks!!
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
5 +620=number of threads per inch
Ioanna Karamanou


  

Answers


12 mins   confidence: Answerer confidence 5/5 peer agreement (net): +6
20=number of threads per inch


Explanation:
Parts are indicated by their nominal diameter (the nominal outside diameter of the screw threads), number of threads per inch, and the class of the thread. For example, “.750-10UNC-2A” is male (A) with a nominal outside diameter of 0.750″, and 10 threads per inch; “.500-20UNC-1B” would be female (B) with a 0.500″ nominal diameter (i.e., the hole will be drilled less than that) and 20 threads per inch.

--------------------------------------------------
Note added at 16 mins (2006-10-06 06:10:34 GMT)
--------------------------------------------------

For further clarification, as redundant as it may seem, threads are either in the hole or on the screw; they are the fastening mechanism of the bolt, essentially. The "swirls" might be a way to describe them.

Example sentence(s):
  • http://en.wikipedia.org/wiki/Screw_thread
Ioanna Karamanou
United States
Local time: 16:46
Native speaker of: Native in EnglishEnglish, Native in GreekGreek
PRO pts in category: 4
Grading comment
many thanks!!

Peer comments on this answer (and responses from the answerer)
agree  Joe L: I know what you meant by "either", but with mounting holes (posts) I think we should say the threads are BOTH in the mounting hole and on the screw, itself.
13 mins
  -> Oh my, of course!! Thanks for pointing that out!
agree  Ken Cox: right -- as the inch system is standard in the US, the unit (inch) is often omitted in informal usage. The text means the item has holes drilled and threaded for 1/4-inch dia. screws with 20 tpi.
1 hr
agree  Tony M: Yes, Keneth's explaantion is a lot clearer; prob. ¼" 20 UNF (or UNC) it is ONE thread
2 hrs
agree  Lubosh Hanuska
4 hrs
agree  Will Matter: Kenneth's explanation is excellent and your answer is also good. Learn something new every day around here.
11 hrs
agree  Alfa Trans (X)
2 days 3 hrs
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