Description
Overview:
These M4 x 20mm A2 Hexagon Head Stainless Steel DIN 933 Setscrews are fully threaded fasteners for general fixing and maintenance across construction, workshop, and garden machinery. Made from A2 (304) stainless steel, they offer reliable corrosion resistance for indoor, outdoor, and damp environments. The 20mm length (approx. 0.79 inches) suits brackets, guards, panels, and accessories where a full thread is preferred. The hex head allows secure tightening with standard spanners or sockets, helping achieve consistent clamping without head damage. Supplied in a bulk pack of 500 for convenient stockholding, these setscrews conform to DIN 933 dimensions for predictable fit with standard M4 nuts and washers. Manufacturer Part Number (MPN): 903 5171. A practical choice for equipment assembly, repairs, and routine maintenance.
Key Features:
- M4 x 20mm (approx. 0.79 inches) fully threaded to the DIN 933 pattern for dependable fit and engagement
- A2 (304) stainless steel for strong corrosion resistance in wet, outdoor, and coastal conditions
- Hexagon head for positive drive with spanners or sockets; easy to fit and remove in tight spaces
- Clean, consistent threading for reliable torque and clamping on thin or layered materials
- Suitable for pairing with standard M4 nuts, washers, and stainless fixings to maintain corrosion performance
- Non-plated stainless finish won't chip or flake like coated fasteners
- Bulk pack of 500 reduces downtime and ensures availability for ongoing maintenance tasks
- Versatile use across construction fixings, plant and tool repairs, and garden machinery
- Resists staining and seizing better than mild-steel alternatives in wet service
- Practical choice where a full thread is needed for adjustability or short grip lengths
Typical Applications:
General assembly and repairs on brackets, guards, covers, and panels; securing accessories to frames and chassis on lawn mowers, compact machinery, generators, pumps, pressure washers, and small plant; outdoor fixtures, decking hardware, and jigs; light-duty marine and dock fittings where stainless performance is beneficial; maintenance stocks for workshops and site engineers.
Also known as:
Hex setscrew, fully threaded hex bolt, hex cap screw, machine screw (M4), stainless hex screw, M4 hex bolt, A2 stainless bolt, DIN 933 hex screw, ISO 4017 pattern hex screw (equivalent style), stainless fastener for outdoor use.
Alternate Part Numbers:
9035171
Product Specifications
| L&S Part No. | 903 5171 |
|---|---|
| Unit of Sale | 1 |
| Size | M4 x 20 mm |
| Key Features | - M4 x 20mm fully threaded for secure fit - A2 stainless steel resists corrosion in damp conditions - Hexagon head allows easy tightening with spanners - Bulk pack of 500 for convenient stockholding - Compatible with standard M4 nuts and washers |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
