Steel Socket Cap Screw 8.8
ISO 898-1 class 8.8 quenched-and-tempered socket head cap screws to DIN 912 / ISO 4762. The standard high-tensile cap screw for fixtures, tooling, and machinery. Listed M3–M33.
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Available Sizes & Finishes
263 sizes available
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Applications & Selection Guide
ISO 898-1 property class 8.8 socket head cap screws to DIN 912 / ISO 4762. Quenched and tempered, 800 MPa nominal tensile, cylindrical head, internal hex. The default high-tensile cap screw for fixtures, moulds, guarding, and machinery. Listed M3–M33.
Specify class 8.8 when the joint is load-bearing but not at 10.9 preload. Counterbore to DIN 974 (or the drawing) so the head sits flush. Use class 8 nuts if nutted; into steel tapped holes follow the engagement-length rules. For a flush 90° head use DIN 7991; for a low head use DIN 6912; for a rounded visible head use ISO 7380.
Request a quote with M×L, quantities, finish (plain, zinc, or other), 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 →Nut and washer types compared: hex, lock, flange, castle, coupling, cap and HV nuts, flat, spring and structural washers, with their standards
How hex, thin, nylon-insert and all-metal lock, flange, castle, coupling, cap, wing and HV nuts differ, which nut class goes with which bolt, and when to use DIN 125, DIN 127, DIN 7989 and DIN 6916 washers.
Read the guide →Product Information
Material Grade
ISO 898-1 class 8.8
Manufacturing Standard
DIN 912 / ISO 4762
Material Type
Steel
Category
Socket Cap Screw
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