Steel Countersunk Socket Screw 8.8
ISO 898-1 class 8.8 countersunk socket screws to DIN 7991 / ISO 10642. Flush high-tensile fasteners for fixtures and machinery where the head must sit in the plate. Listed M3–M24.
Choose a size below and add it to your quote.
Available Sizes & Finishes
88 sizes available
Filters
Diameter (mm)
Thickness (mm)
Applications & Selection Guide
ISO 898-1 property class 8.8 countersunk socket head screws to DIN 7991 / ISO 10642. 90° flush head, internal hex drive, quenched and tempered (800 MPa nominal). Listed M3–M24. Countersunk geometry has less tensile capacity than a DIN 912 cylinder head of the same class.
Specify when the head must disappear into the plate on an 8.8 joint. ISO 10642 recognises reduced loadability versus a cylindrical-head screw of the same class — if the joint needs full 8.8 capacity, use DIN 912 and a counterbore instead. Pair with class 8 nuts if nutted.
Request a quote with M×L sizes, quantities, surface finish, and delivery country.
Technical guides
Bolt grades and sizes: 8.8, 10.9, 12.9, A2 and A4, and metric hex bolt dimensions
What the property classes 4.8, 8.8, 10.9 and 12.9 and stainless A2-70 and A4-70 mean, minimum strength and tensile loads, metric thread pitch and hex head sizes, DIN 933 vs DIN 931, and which nut goes with which bolt.
Read the guide →Screw types compared: socket head, countersunk, set, carriage, tapping and self-drilling screws, with their DIN and ISO standards
How socket head, button head, countersunk, low-head and set screws differ, what DIN 912, ISO 7380, DIN 7991, DIN 916, DIN 603, DIN 965, DIN 7981 and DIN 7504 stand for, and which screw to order for machinery, timber and sheet metal.
Read the guide →Product Information
Material Grade
ISO 898-1 class 8.8
Manufacturing Standard
DIN 7991 / ISO 10642
Material Type
Steel
Category
Countersunk Socket Screw
Ready to request pricing?
Add sizes to your quote cart, or paste your full list — Excel, CSV, or plain text.