Sutemribor M2 M3 M4 Alloy Steel Hex Socket Head Cap Screws Nuts Washers Kit 1200PCS Review (2026)

What is in the kit

This assortment from Sutemribor packs 1200 pieces of hex socket head cap screws, matching nuts, and washers across M2, M3, and M4 thread sizes, with lengths spanning roughly 6mm to 30mm depending on the size. Everything ships sorted into a compartmentalized case, which keeps the smaller M2 hardware from getting lost among the larger M4 pieces and makes it realistic to actually find the right screw at the bench rather than digging through a loose bag. The kit is built from alloy steel rated around grade 12.9, a common spec for hex socket cap screws that prioritizes strength for structural or repeated-use fastening rather than corrosion resistance.

Where this fits an FPV workshop

FPV frames, motor mounts, camera cages, and accessory brackets use a wide range of small hex screws, and having a stocked assortment on hand means a stripped thread, lost screw, or frame swap does not turn into a parts-ordering delay. The M2 through M4 range specifically covers most micro whoop hardware up through freestyle and racing frame components, which is the bulk of what a typical FPV builder needs day to day. Having washers included is a genuine convenience too, since washers help spread clamping load across carbon fiber plates and reduce the chance of a screw head cracking or denting the frame over repeated tightening.

Build quality and durability

Alloy steel hex socket screws are a step up in strength from the basic zinc-plated hardware sometimes bundled with budget drone kits, and the hex socket drive itself resists cam-out better than a Phillips head when using a hex driver or Allen key, which matters when a screw is torqued into carbon fiber and needs to come out again later without stripping. The trade-off with alloy steel over stainless is that it is more prone to surface rust if kept somewhere damp, so pilots in humid climates or those who fly near saltwater should store the case somewhere dry or consider a light coat of oil on unused stock.

Fit considerations versus button head screws

Hex socket head cap screws have a taller, more cylindrical head profile than the low-profile button head screws that many FPV frame and motor mounting kits are designed around. That extra height is rarely an issue for general assembly, brackets, or accessory mounting, but it can create prop strike risk if used in a spot originally designed for a low-profile button head, particularly near propeller arcs on compact frames. Builders should check headroom before substituting one of these screws directly into a motor mount or any location close to spinning props, and keep a small stock of proper button head screws on hand for those specific spots instead.

Who should buy this kit

This is a sensible buy for anyone running a busy FPV workshop, whether that is a hobbyist building and repairing several quads a month or someone maintaining a fleet of frames, camera mounts, and accessories where losing a screw here and there is inevitable. The 1200-piece count is overkill for a single build but pays off over years of repairs and swaps. Casual pilots who only own one or two drones and rarely open them up may not need this much stock and could get by with a small dedicated motor screw pack instead, especially since the case itself takes up meaningful shelf space.

Frequently asked questions