| 4501 | Stationery | |
| 4502 | Stainless Steel Waste Bins | |
| 4503 | Squid Ink Industrial Printing Systems | |
| 4504 | Solar LED Warning Lights - Long | |
| 4505 | Static Monitors | |
| 4506 | Silt Fence | |
| 4507 | S Series Voltage Stabilizer | |
| 4508 | Schneider Molded Case Circuit Breakers | |
| 4509 | Schneider Contactors | |
| 4510 | Schneider Miniature Circuit Breakers | |
| 4511 | Super Drill Machine SD-1M | |
| 4512 | Super Drill Machine EDM-DR | |
| 4513 | Super Drill Machine EDB-435F | |
| 4514 | Super Drill Machine ED-1 | |
| 4515 | Soft Starters | |
| 4516 | SINAMICS G110 Series Frequency Inverter | |
| 4517 | SM-1711 Sliding Mortise Locks | |
| 4518 | SM-1105 Cylinder Mortise Lock | |
| 4519 | Special Bolts | |
| 4520 | Supply and maintenance for drive and control systems for blast doors | |
| 4521 | Self Closing Spring Hinges | |
| 4522 | Spiral Coolant Hole | |
| 4523 | Solid Carbide Rods | |
| 4524 | Single And Double Straight Coolant Hole | |
| 4525 | Swallow Brand Wire Nails | |
| 4526 | Steel Deformed Bar | |
| 4527 | Stretch-Wrapping Machines | |
| 4528 | Steel Strapping Bands | |
| 4529 | Spray Paints | |
| 4530 | Silt Fences | |