hexagonal head screws with "small" key

[Druck]

Hello, everyone.

I happen to have you screws with smaller keys than those of the law.

examples:
m12 - ch=17 (in place of 19mm)
m14 - ch=19 (in place of 22mm)
m16 - ch=22 (in place of 24mm)
m20 - ch=27 (in place of 30mm)


do you know if there is any unification (iso/en/uni) about it?

Besides, these screws also have the highest head,
as if they had an integral "subhead washer".

Thank you for your help.
Hi.

 

[Preparation-H]

Hello, everyone.

I happen to have you screws with smaller keys than those of the law.

examples:
m12 - ch=17 (in place of 19mm)
m14 - ch=19 (in place of 22mm)
m16 - ch=22 (in place of 24mm)
m20 - ch=27 (in place of 30mm)


do you know if there is any unification (iso/en/uni) about it?

Besides, these screws also have the highest head,
as if they had an integral "subhead washer".

Thank you for your help.
Hi.

Hi.

personally this type of screw I have never seen it, I think it is non-standard details, probably built on customer indication for applications where (magari) there were room problems to operate with more "gross" keys.
Usually on stainless steel screws the size of the hexagon in some cases are larger...

Hi.
p-h

 

[Davis]

I have always found screws with hexagons defined according to the thread, I found them with the head of the lowered screw, with fine step thread rather than big, but never with a hexagon different from the one indicated in the tables. I personally think you came across something not stadard. p.s. are you sure this is a metric thread?

 

[Druck]

discovered...

they are actually design screws, they consume so many that they exhaust a mold to each batch, so in the end they cost like the standards. they have designed them to reduce the costs of what is around us.

hello and thanks to those who responded.

 

[zeigs]

curious, I would have bet that drawing would cost more than that standard