Description
Hex Socket Cap Head Screw M5x20 Steel Grade 12.9 — BOLTON SKU 57591.
About the Hex Socket Cap Head Screw M5x20 Steel
The Hex Socket Cap Head Screw M5x20 is a socket head cap screw with an M5 metric thread and 20 mm nominal length, produced in steel of property class 12.9 — the highest common property class for metric socket screws. Under the ISO 898-1 designation system the class marking 12.9 denotes a nominal tensile strength of 1200 N/mm² with a yield-to-tensile ratio of 0.9, so this fastener is selected where clamping force and fatigue capability matter more than corrosion resistance. The cylindrical head carries an internal hexagon drive suited to counterbored, high-torque installation. Surface finish (typically black oxide or plated on class 12.9 parts) and batch certification should be stated in your RFQ so the correct variant is quoted for your application.
Key specifications
| Thread size | M5 |
|---|---|
| Nominal length | 20 mm |
| Head style | Cylindrical cap head |
| Drive | Hexagon socket |
| Material | Alloy steel, property class 12.9 |
| Nominal tensile strength (class designation, ISO 898-1) | 1200 N/mm² |
Typical applications
Class 12.9 M5 x 20 cap screws are used in highly loaded bolted joints — machine tools, fixtures, actuation hardware and drivetrain components — where the joint is torqued near the fastener’s capacity. They are generally installed with controlled torque and, in corrosive settings, protected by coatings agreed at ordering.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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