Spanner Head Hole Dimensions?
Spanner Head Hole Dimensions?
(OP)
Hello!
I am designing a fastener that I'd like to use a #4 spanner head screw drive on, but cannot find any documentation around what diameter to make the holes.
I found this document from Fastenal that lists all the dimensions and tolerances I need except for the diameter:
https://www.fastenal.com/content/product_specifica...
It just lists "Drive Size" as "4," does this relate to a standard dimension that I should know?
I looked up the normal width of #4 slotted and Phillips and it looks like they are .031" - .039" wide. I also am ordering a some spanner head screws from McMaster to measure myself, but would feel better if I could find a reference or standard to back that up.
Thank you!
I am designing a fastener that I'd like to use a #4 spanner head screw drive on, but cannot find any documentation around what diameter to make the holes.
I found this document from Fastenal that lists all the dimensions and tolerances I need except for the diameter:
https://www.fastenal.com/content/product_specifica...
It just lists "Drive Size" as "4," does this relate to a standard dimension that I should know?
I looked up the normal width of #4 slotted and Phillips and it looks like they are .031" - .039" wide. I also am ordering a some spanner head screws from McMaster to measure myself, but would feel better if I could find a reference or standard to back that up.
Thank you!





RE: Spanner Head Hole Dimensions?
Are those security drive based on a standard, or are they proprietary? Can you contact the manufacturer of the driver?
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JHG
RE: Spanner Head Hole Dimensions?
It may be better to work backwards and buy a driver bit first and reverse engineer it.
On the link I provided, scroll down to Bits Only and select one there ( Even there you will notice there are no given dimensions.)
B.E.
You are judged not by what you know, but by what you can do.
RE: Spanner Head Hole Dimensions?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Spanner Head Hole Dimensions?
I know there is a proprietary "snake eyes" brand (by "Tamper Proof," the company berkshire linked to), but there are also lots of generic "spanner head" drives on the market. I was hoping these generics were standardized and I was just missing the documentation.
I've avoided contacting the manufacturer thus far because I suspect, like berkshire mentioned, they'd get a bit cagey.
I have ordered a "#4" driver bit and a set of "#4 spanner head" machine screws to measure. My only concern with this route was coming up with the proper tolerances given the small sample size. For my application, the smaller the holes, the better, but I'd also like to ensure the driver fits the screw the vast majority of the time.
Thank you all for your help! I think the reverse engineering route is the way to go, and I'll also get in touch with a couple manufacturers. It can't hurt to ask!
RE: Spanner Head Hole Dimensions?
We have all the standard and specs for the various drives- in this case I would just call up our punch manufactures and order #4 spanner drive punches and they would just send them out- no need for any dimensions at all. Just like you don't need to dimension a #2 Phillips- just tell us what drive size you want.
RE: Spanner Head Hole Dimensions?
Thank you very much for the reply! It's great to hear from someone specifically in the industry.
I totally agree, I'd much rather leave it up to the supplier and not get involved in the details. Unfortunately, the component I'm designing is non-standard for numerous other reasons, so we're working with a machine shop that doesn't normally produce these sort of things and, I believe, wants specific dimensions for every feature. This might be a an invalid assumption on my part, however. They very well may be able to order a punch like you suggest and I'm just overthinking it. I'll look into that route!
Thanks again to everyone for all the assistance!
RE: Spanner Head Hole Dimensions?
From an IP point of view I get what you're saying, from an inspection point of view seems to leave a gap.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Spanner Head Hole Dimensions?
RE: Spanner Head Hole Dimensions?
http://greensladeandcompany.com/fastener-inspectio...
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Spanner Head Hole Dimensions?