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Applications & Selection Guide
ISO 898-1 class 4.8 countersunk socket head screws to DIN 7991 / ISO 10642. 90° countersunk head with internal hex so the fastener sits flush with the plate. Metric coarse, listed M3–M24.
Use on covers, hinges, and panels that must stay flush. Class 4.8 suits light duty; the countersunk head has less material than a DIN 912, so do not treat it as equal in tensile capacity. Machine a matching 90° countersink. For a Phillips drive in the same head form see DIN 965.
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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 4.8
Manufacturing Standard
DIN 7991 / ISO 10642
Material Type
Steel
Category
Countersunk Socket Screw
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