BEST ANSWER: I assume you mean square head size? The sizes of square heads I have used, from smallest to largest are 0, 1, 2, and 3. A Size 0 is very small and is used for #6 and smaller screws , but generally for #4s and smaller and usually very short , 3/8 inch to maybe 3/4 inch. Custom manufacturer of screws to customer specifications including set screws , socket head cap screws , and more. Specializing in hard to manufacture parts for critical applications. heree to Newstar Fastenings . Newstar Fastenings Ltd is a leading distributor of quality micro screws , standard screws and fixings and other small nuts and bolts in all materials such as Stainless Steel, Brass and Steel.
Enjoy the Teks #8 x 1/2 in. Zinc-Plated Steel Truss- Head Phillips Sharp-Point Lathe Screws (260-Pack) 21500, fasteners screws feature sharp points and can be used where a wide, low-profile screw head is needed at The Home Depot Heatsink Screws expansion port screws JCIS JIS Japanese Camera Industry Standard waferhead wafer wafer head thinhead thin head M2.5x5mm M2.5x8mm cheap laptop screws 2mm mm 3mm 2.5mm 2.5 2 3 assorted buy M2 M2.5 M3 mini screws micro screws stainless steel zinc machine screws small screws panhead cheesehead cheese flathead pan flat metric machine screws metric screws … These #10 Powerhead Wood Screws feature a 9/16'' diameter head for superior holding power and is perfectly sized for a FastCap screw cap.
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Lag screws (US) or coach screws (UK, Australia, and New Zealand) (also referred to as lag bolts or coach bolts, although this is a misnomer) are large wood screws .Square-headed and hex-headed lag screws are covered by ASME B18.2.1 standards, and the head is typically an external hex. A typical lag screw can range in diameter from 1 ⁄ 4 in (6.35 mm) to 1 1 ⁄ 4 in (31.75 mm),