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These set screws have a common cup end and are driven by standard hex keys. Handy to replace lost set screws in steering arms, prop adapters and shaft collars. Perhaps you want to drill and tap part for a larger screw. Small set screws can be hard to find in local hardware stores.
A set screw threads through a collar, hub, or fitting to clamp against a shaft, locking a part in place without a separate bolt head. These small steel fasteners are a quiet workhorse in RC hardware, holding wheels, gears, and couplers where they belong.
SAE Sizes and Pack Counts
This category covers steel set screws in SAE machine screw sizes, running from 2-56 up through 4-40, 6-32, 8-32, and 10-32. Shorter and longer lengths are grouped by size, and they come in small packs of four or six so you can keep a few spares on hand for the sizes you use most.
Because the head seats below the surface, a set screw keeps a clean profile and stays clear of moving parts, and the socket or slotted drive lets you tighten it firmly against the shaft for a grip that holds under vibration.
Match the thread size and length to your part in the listings below.
 "Du-Bro 4mm Socket Set Screws, 4-Pack")
 "Du-Bro 3mm Socket Set Screws, 4-Pack")