Description
Overview:
These Hex Socket Head Cap Screws are high-strength fasteners made from alloy steel to Grade 12.9, with a chemical black finish for protection and a clean, low-glare look. Size M5 x 55 means a 5 mm diameter (approx. 0.20 in) and 55 mm length (approx. 2.17 in), suitable where a compact head and high clamp load are needed. The internal hex drive allows positive engagement with an Allen key, reducing the risk of slippage in tight spaces. Supplied in a pack of 10, they are ideal for assembly, maintenance, and repairs on construction and garden machinery, power tools, and general industrial equipment. Identified by MPN 903 0286 200PK, they suit brackets, housings, guards, and precision fixtures.
Key Features:
- Grade 12.9 alloy steel for very high tensile strength and dependable clamping force
- Chemical black (black oxide) finish for mild corrosion resistance and a smart, uniform appearance
- Precise M5 x 55 sizing for accurate fit; standard coarse thread (M5 typically 0.8 mm pitch)
- Internal hex drive helps prevent cam-out and allows easy access in confined locations
- Consistent thread quality for smooth installation and secure tightening
- Uses a common 4 mm hex key for straightforward fitting and removal
- Pack of 10 for efficient stocking and multi-bolt assemblies
- Suitable replacement choice across construction plant, workshop fixtures, and garden machinery
- Alternative finishes commonly available (e.g. zinc plated, stainless steel) to match environment needs
- Wide size range available in the series, from small M3 up to larger M24 lengths
Typical Applications:
Used for assembling and repairing machinery, fabrications, and fixtures where a strong, compact-headed fastener is required. Common on engine covers, gearbox housings, guards, clamping plates, brackets, pulleys, and frames. Suitable for construction equipment, agricultural and garden machinery, and workshop tooling, especially where repeatable torque and high clamp loads are needed.
Also known as:
Socket head cap screws, caphead bolts, Allen cap screws, hex socket cap bolts, SHCS, DIN 912/ISO 4762 cap screws, internal hex cap bolts.
Product Specifications
| L&S Part No. | 903 0286 |
|---|---|
| OEM No. | 903 0286 200PK |
| Unit of Sale | Pack of 10 |
| Key Features | - Grade 12.9 alloy steel for high tensile strength - M5 x 55 size for precise fit and standard coarse thread - Chemical black finish for mild corrosion resistance - Internal hex drive reduces slippage in tight spaces - Pack of 10 for efficient stocking and use |
