DIN 912 / ISO 4762 in M2.5, M3, M4, M5, M6, and M8. Knurled is more common. Photos of both are in the images. Nuts - standard, flange, nylock, and wing.
DIN912 Metric Thread Screws M2 M2.5 M3 M4 M5 M6 M8 Black Grade
25) M8 - 1.25 x 90mm Stainless Steel Socket Head Cap Screws DIN
M3 M4 M5 M6 M8~M24 304 stainless steel Eye screw bolt O-ring
50Pcs M1.6 M2 M2.5 M3 M4 DIN912 304 Stainless Steel Hexagon Socket Head Cap Screws Hex Socket Screw Metric Bike Screw - AliExpress
MonsterBolts - M2.5 x 4mm Socket Head Screws, DIN
02) M3 METRIC SOCKET HEAD CAP SCREW STAINLESS STEEL – Cees Fasteners
50pcs 2.5m Stainless Steel Hex Key Socket Head Cap Screws Bolts
M8 STAINLESS STEEL Button Head Socket Cap Screws, A4 / 316 Marine
M2.5-M8 Allen Hex Socket Head Cap Screws Stainless Bolts Flat Washers Split Lock
Socket Cap Screws
M3 x 0.5 Ti Titanium Socket Head Caps screws DIN 912 / ISO 4762
50-500pcs M2 M2.5 M3 M4 DIN912 304 Stainless Steel Hex Socket Head
Buy Up to 720pcs Hex Socket Head Cap Screws Assortment Kit DIN912 M2 M2.5 M3 M4 M5 Stainless Steel Metric Allen Bolt Nut with Case at Aliexpress for .
Up to 720pcs Hex Socket Head Cap Screws Assortment Kit DIN912 M2 M2.5 M3 M4 M5 Stainless Steel Metric Allen Bolt Nut with Case