Steel Countersunk Socket Screw 10.9
ISO 898-1 class 10.9 countersunk socket screws to DIN 7991 / ISO 10642. High-preload flush fasteners — head geometry reduces tensile capacity versus a DIN 912 of the same class. Listed M3–M24.
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88 sizes available
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Applications & Selection Guide
ISO 898-1 property class 10.9 countersunk socket screws to DIN 7991 / ISO 10642. Alloy steel, 90° flush head, internal hex, listed M3–M24. Use only where the design accepts the reduced tensile area of a countersunk head at 10.9 — DIN 912 remains the stronger geometry for full preload.
Use only where the design accepts the reduced tensile area of a countersunk head at 10.9. For maximum clamp in a compact joint, DIN 912 10.9 in a counterbore is the stronger geometry. Confirm coating practice for 10.9. Mate with class 10 nuts if a nut is used.
Include M×L sizes, quantities, coating requirements, and destination in your quote request.
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 10.9
Manufacturing Standard
DIN 7991 / ISO 10642
Material Type
Steel
Category
Countersunk Socket Screw
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