Cross recessed(+)Truss head machine screw(Coarse Steel Trivalent black(Black) 4 X 3 Pitch 0.7

The head has a rounded shape, like the upper portion of a sphere cut off. Compared to a round head, the height is lower. A distinguishing feature is that the head outer diameter is larger than other head styles, which increases the bearing surface area and can be expected to provide effects such as resistance to loosening. Truss head machine screws are relatively common sights around town. Due to their attractive appearance, they are also used as decorative screws, similar to round countersunk heads. Since counterboring is not required, they can be used in a wider variety of locations; however, the head outer diameter will be larger.
Machine Screw Head Dimension Chart　Truss Head Machine Screw Encyclopedia

Hot-dip galvanized coating has a large film thickness, and therefore may not be compatible with other surface treatments.
In addition, even with the same hot-dip galvanized finish, compatibility issues may arise when products are sourced from different suppliers.
In such cases, we may not be able to accept returns, so please acknowledge this in advance before proceeding with your purchase.

Truss Head Machine Screw - Truss Head

• Cross recessed (+) truss head machine screw coarse pitch
• Nominal diameter (d) M4
• Length under head (ℓ) 3
• Pitch P 0.7
• Cross recess number 2
• Head diameter (dk) Nominal 9.4 Tolerance 0,-0.5
• Head height (K) Nominal 2.5 Tolerance ±0.15
• Cross recess (m) Reference 4.3
• Cross recess depth (q) Max 2.13 Min 1.60