Loads more being listed so take a look if you need different sizes.
eBay
M2 M2.5 M3 M4 M5 M6 M8 Metric Acrylic Clear Screw Bolt Round Head Phillips Screw Plastic Acrylic Insulated Fixing Cross Screws
Aliexpress UK
2 BA Steel Round Head Machine Screws Manufactured by EKP Supplies in The UK.
eBay
Phillips Pan Round Head With Washer Self-tapping Screw M1.2 M1.4 M1.7 M2 M2.3 M2.6 M3 M4 Carbon Steel PWA Wood screw Servo Screw
Aliexpress UK
6 BA Brass Round Head Machine Screws Manufactured by EKP Supplies in The UK.
eBay
Watch Back Case Repair Screws Stainless Steel Watch Movement Caseback Screws Kit 10 sizes Watch back cover screws Accessories
Aliexpress UK
2 BA Steel Cheese Head Machine Screws Manufactured by EKP Supplies in The UK.
eBay
B84B-Video Doorbell Screws,Video Doorbell Replacement Screws,Security Screws Compatible With Video Doorbell
Aliexpress UK
Raised Countersunk Slotted Head Screws. A2 Stainless Steel.
eBay
Thread Checker Screw Measurement Ruler Stainless Steel Caliper Metric Gauge Tool For Measuring Screw Pitch Bit Bolt Nut Screw
Aliexpress UK
eBay
100pcs screws, watch accessories, movement screws, various sizes, special screws
Aliexpress UK
5BA (5mm A/F Head). 4BA (.248" A/F Head). 6BA (5mm A/F Head). 8BA (4mm A/F Head). BA Stainless Steel Hexagon Screws. 1/2" or 3/4" Lengths.
eBay
1pc 1/4inch D-Ring Tripod Screw Mounting Screw Adapter for Camera Camcorder Tripod Monopod QR Quick Release Plate Adapter Screw
Aliexpress UK
4 BA Small hex head screws (50pk) available in various lengths. EKP supplies.
eBay
Dual use Male Screw Camera Accessories Dual use Screw 1/4'' & 3/8'' Adapter Male Screw For Head Tripod Monopod
Aliexpress UK