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.
M1.6 M2 M2.5 M3 M4 M5 M6 M8 *L DIN912 Stainless Steel Hex Allen
New Stainless Steel Partial Thread M3-0.50 x 35mm Socket Head Cap Screws. These have an A2-70 / 18-8 Grade.
M3 x 35mm (PT) Stainless Steel Socket Head Cap Screws, DIN 912 A2 Coarse 0.50
ISO 4762 DIN 912 Hexagon socket Head Cap Screws - Vidasan
M12 .75mm Steel Socket Head Screws 60mm Long 10mm Drive for sale
25) M8 - 1.25 x 90mm Stainless Steel Socket Head Cap Screws DIN
M6 -1.0 X 50mm Stainless steel allen hex socket head metric bolts
M4 M5 M6 GRADE 8 Socket Cap Head Self Tapping Model Wood Screws
socket-capscrews-stst
M2.5 x 4mm Allen Cap Head Screws Bolts Socket Screws Stainless Steel A2 (304) DIN
5-50pcs DIN912 M1.6 M2 M2.5 M3 M4 M5 M6 M8 304 A2 Stainless Steel grade 12.9 Black Hexagon Hex Socket Head Cap Allen Bolt Screw