Description
Overview:
The Mason Mate Socket Set (grub) screws are headless, internal-hex fasteners for locking parts securely in place where a standard bolt head will not fit. Supplied as a pack of 10, each screw is M6 thread with a 20 mm length (0.79 in ≈ 20 mm). They are finished in a chemical black (black oxide) coating on steel to offer added surface protection and a neat, low-reflection appearance. These set screws are commonly used to clamp pulleys, gears, collars, couplings, and similar components to a shaft, helping to prevent slippage and maintain alignment. Suitable for construction plant, workshop machinery, garden equipment, and general mechanical assemblies, they provide a reliable, flush fit where compact fastening is needed.
Key Features:
- M6 x 20 mm length per screw (0.79 in ≈ 20 mm), headless for a flush finish
- Pack of 10 for routine maintenance and spares management
- Internal hex drive for positive engagement with a hex key and controlled tightening
- Chemical black (black oxide) finish for added corrosion resistance in everyday environments
- Precision-machined threads to help maintain grip and alignment under vibration
- Compact form factor ideal for confined spaces and close-clearance assemblies
- Suitable for fixing collars, gears, and couplings to shafts without protruding heads
- Mason Mate brand, made for consistent fit and dependable performance
Typical Applications:
Used to secure rotating parts on shafts in machinery, lock shaft collars and hubs, fix couplings, set positions on linear guides, and hold components inside housings. Common across construction equipment, garden machinery, power transmission assemblies, and workshop jigs where a flush, non-protruding fastener is preferred.
Also known as:
Hex socket set screws, grub bolts, headless set screws, hex drive set fasteners, blind screws, socket grub screws.
Product Specifications
| L&S Part No. | 903 0357 |
|---|---|
| Manufacturer | Masonmate |
| OEM No. | 903 0357 |
| Unit of Sale | Pack of 10 |
| Size | M6 x 20 |
| Key Features | - M6 thread, 20 mm length, headless for flush finish - Pack of 10 for maintenance and spares - Internal hex drive for controlled tightening - Black oxide finish for corrosion resistance - Ideal for confined spaces and close-clearance assemblies |
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