Cross recessed(+)Upset head screw(Coarse Stainless steel Unplated 6 X 20 Pitch 1.0

In upset forging, the head is cold-formed into a hexagonal or square shape, and typically has an indentation on the top surface of the head. While it resembles a hex bolt, it is classified as a machine screw because it has a cross recess. There are also upset hex bolts without a cross recess, which are classified as hex bolts. Standard hex bolts are produced using a process called trimming, where a circular head is first formed and then passed through a die with a hexagonal cavity to achieve the final shape.
In upset forging, the corners are rounded and smooth, whereas with trimming, the corners are sharp and well-defined.
≪※1≫ You can view the manufacturing processes of various manufacturers by searching for "trimmer screw" or "upset screw" on video-sharing websites.
≪※2≫ For explanations of the "4 mark" and similar markings, please refer to the bottom of the page.
This is a highly versatile machine screw that can be driven with multiple tools. Despite having a hexagonal head, it also features a cross recess, giving it a softer impression than a hex bolt, and its combination of various characteristics may even make it an interesting choice for decorative applications.
Please note, however, that while it resembles a hex bolt in shape, it does not have the same strength as a hex bolt.Upset Machine Screw Encyclopedia

Since hot-dip galvanized coating has a large film thickness, other surface treatments may not be compatible with it.
Additionally, even with the same hot-dip galvanized finish, compatibility issues may arise if the products are purchased from different suppliers.
Please be aware that returns may not be accepted in the cases described above, so kindly confirm this before proceeding with your purchase.

• Cross recessed (+) upset head screw, coarse pitch
• Nominal thread diameter M6
• Length under head (ℓ) 20.0
• Pitch (P) 1.0
• Cross recess number 3
• Width across flats (s) Nominal 10.0 Tolerance 0, -0.2
• Width across corners (e) Reference 10.9
• Head height (k) Nominal 4.0 Tolerance ±0.15
• Cross recess (m) Reference 6.2
• Under-head fillet (r) Min 0.25