M4x30 Steel Button Socket Screw 8.8
M4x30 button head socket screw, property class 8.8 to ISO 7380, with a low domed head and hex socket drive. Carbon steel — for aesthetic or low-profile joints; request coating if corrosion protection is required.
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Applications & Usage
M4x30 class 8.8 button socket screws are the standard choice for fixtures and covers needing a smooth domed head.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | M4x30 |
| Material | Steel |
| Alloy/Grade | ISO 898-1 class 8.8 |
| Standard | ISO 7380 |
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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 →