M4 X .7 X 16MM Button Hd Cap Screw , These are manufactured from 7075 Aircraft Quality Aluminum Heat treated to a T-6 condition. Fastener Dimensional Data for Metric Aluminum Button Head Cap Screws - Plain Aluminum: (Size: 4mm)

For Reference Only:

Metric Aluminum Button Head Cap Screws - Dimensional Data
Metric Machine Screw Threads - Dimensional Data

Find Coordinating nuts and washers for your Metric Aluminum Button Head Cap Screws below:

Nuts:

Aluminum Locknuts