了解美國螺絲尺寸


70

我要建立一個工作台,所以我一直在"螺絲購物"。當廣告宣傳為(例如)6 x 3/4"時,我需要一些螺釘尺寸的解釋。我知道螺釘的長度是3/4",但是6的含義是什麼?

1

6 refers to the size of the screw - diameter, threads, etc

http://www.wlfuller.com/html/wood_screw_chart.html

http://www.csgnetwork.com/screwinfo.html


68

"6" is a #6-size screw. Screw gauges are a measure of the head size and shaft size, and are roughly linear but not quite a 1:1 relationship (a #8 screw is a little less than twice the diameter of a #4 screw). There isn't a good system for converting gauge to a calibrated measurement, so you're best off consulting a table like this: http://hingedummy.info/screwinfopage2.htm

Screws have three basic measurements: gauge, threads per inch, and shaft length in inches. So, you may also see a measurement like 6-32 x 1 1/2". This means it's a #6 diameter, with 32 threads per inch (almost double the normal thread count as a standard wood screw) and an inch and a half long. When the middle number is absent (6 x 1 1/2"), the screw has the "normal" number of threads per inch for that size and type of screw (for #6 wood screws that's 18).


2

McMaster-Carr also has a good description of a lot of information concerning the many kinds of threaded fasteners available. http://www.mcmaster.com/#about-machine-screws/=h8mmn6


5

The sites mentioned in previous answers are nice, but are not comprehensive. There are several different ways of measuring the diameter which is critical to understand based on the application. For example, for placing a screw in a tapped hole, the important diameter is the major diameter (the largest diameter around the shank including the threads). A chart with those measurements is given here: http://www.engineersedge.com/screw_threads_chart.htm along with explanations of the different measurements: https://en.wikipedia.org/wiki/Screw_thread#Diameters


3

Back in the last century when we were not sure of a screw's gauge, a reliable rule of thumb was to measure the diameter of the countersunk head in inches. Deduct from that measurement 1/16", and then count the number of 1/32" remaining. So a screw head with a diameter of 1/4" was a 6 gauge, 5/16" was an 8 gauge, 3/8" was a 10 gauge and so on.


0

The way I was shown was to measure across the screw head in1/16th's double it and take away 2. ie. if it is 5/16th's across double to 10 - 2 = 8


9

You might find this table useful as well...

========================================================================
Gauge   Metric equiv.   Pilot hole   Clearance hole   Masonry plug size
------------------------------------------------------------------------
 3      2.5mm           1.0mm        3.0mm            Yellow ( 5mm hole)
 4      3.0mm           1.5mm        3.5mm            Yellow ( 5mm hole)
 6      3.5mm           2.0mm        4.0mm               Red ( 6mm hole)
 8      4.0mm           2.5mm        4.5mm               Red ( 6mm hole)
10      5.0mm           3.0mm        5.5mm             Brown ( 7mm hole)
12      5.5mm           3.5mm        6.0mm             Brown ( 7mm hole)
14      6.5mm           4.0mm        7.0mm              Blue (10mm hole)
------------------------------------------------------------------------

See also here and the original, here.

Disclaimer: I wrote the table after more than 30 years in trade (builder/carpenter).