M4x20 Steel Countersunk Socket Screw 4.8
M4x20 countersunk socket head screw, property class 4.8 to DIN 7991 / ISO 10642 (ISO metric coarse), 90° flat head with internal hex drive. Carbon steel — for flush mounting in countersunk holes; request coating if corrosion protection is required.
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Applications & Usage
M4x20 class 4.8 countersunk socket screws suit light covers and non-critical flush joints. Prefer 8.8 or 10.9 for load-bearing assemblies.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | M4x20 |
| Material | Steel |
| Alloy/Grade | ISO 898-1 class 4.8 |
| Standard | DIN 7991 / ISO 10642 |
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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 →