The title says head diameter. Do you mean thread diameter?
Hello All,
I need to buy some Socket Cap Head Self-Tapping Screws that are twice as long as what came fitted to my car.
I tracked down different suppliers in Australia. One supplier included a dimensions diagram however it is unclear what point they are suggesting to measure as a diameter to order. One of the dimension lines is on the last tapered thread of the screw and the second dimension line is on the first horizontal and parallel thread that extends along the majority of the screw's length.
For self-tapping screws do you measure the top of the thread where the sides remain parallel (Red) ; or the internal un-threaded shank the internal diameter of the screw (blue)?
I have added another diagram that I hope explains what diameter the manufacturer's are referring to
Kind regards
Lionel
The title says head diameter. Do you mean thread diameter?
Ron B.
VK2OTC
2003 L322 Range Rover Vogue 4.4 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA
RIP Bucko - Riding on Forever
Hello P38 Rover,
Well spotted Ron. Yes Thread Diameter if this is the "d" dimension in the diagram in the earlier post.
Oops - I copied and pasted the title and the manufacturer duplicates the word "head" a couple of times in their description.
I will change the subject line too.
Kind regards
Lionel
are these sold as a gauge I.e. 14g?
I’d say its measured across parallel section.
That diagram is indicating the major diameter, so if you wanted the screw to drop through a hole but be stopped by the head, that’s the dia you would drill. The diameter at the tops of the screw threads on the untapered section.
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
With most self tappers the drill size needed will be written on the packaging, If it isn't then Always start small and work up until you find the correct size drill you need
The diameter measurement you are looking for is for the "Shank" or body of the screw, Not counting the thread itself
You only get one shot at life, Aim well
2004 D2 "S" V8 auto, with a few Mods gone
2007 79 Series Landcruiser V8 Ute, With a few Mods.
4.6m Quintrex boat
20' Jayco Expanda caravan gone
Paul
D2,D2,D2a,D4,'09 Defender 110(sons), all moved on.
'56 S1,been in the family since...'56
Comes out of hibernation every few months for a run
Hello All,
The Socket Cap Head Self-Tapping Screw is from the dashboard of my car. I am fitting a new bracket to hold a reverse camera. The current screws are going to be too short to hold the new bracket.
So I am trying to work back from a screw's dimensions to be able to find out what the packaging description is. This information will allow me to buy longer screws that have a matching head. I would like the new longer screws to blend in with the rest of the dash.
Kind regards
Lionel
Just measured what I have laying around.
8-10G Cross Tip Wood 2.7mm
8G Cross Tip Sheet Metal 3.1mm
14G Cross Tip Sheet Metal 4.7mm
10G Hex Drive Metal Drill Screw 3.6mm
12G Hex Drive Timber Screw 3.8mm
All measured on the parallel section at the bottom of thread.
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