Sutemribor Hex Socket Screw Kit, #4-40

When a small machine panel or removable part needs fastening, having several screw lengths on hand can save a pause to find the right size. This Sutemribor kit groups #4-40 hex socket head cap screws with matching nuts and flat washers for that kind of repair or assembly work.

The assortment contains 254 pieces across screw lengths from 3/16" to 1", stored in a clear box with 10 labeled compartments. That organization is useful at a workbench, though the kit is only a fit when #4-40 is the thread size your project calls for.

Highlights

The screws, nuts, and washers are made from 304 stainless steel. The maker describes the material as corrosion- and rust-resistant, that may be useful for parts exposed to less-than-ideal conditions, but the listing does not specify a particular environment or performance rating. The rounded cap heads have recessed hex sockets, a format intended to be turned with a hex wrench and less prone to slipping at the head than a shallow external drive.

Lengths include 3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", and 1". Matching nuts and flat washers are included, so the box gives you components for more than one fastening arrangement rather than screws alone. Keep in mind that the hex wrench is not included, you will need a compatible one to install or remove the screws.

How to use it

Match the thread size and screw length to the parts being joined before starting. For example, when reattaching a small removable panel, you can compare the available lengths against the thickness of the panel and the material behind it, then use a matching nut and washer where the assembly calls for them. Avoid choosing by length alone: the kit is specifically #4-40, so a different thread size will not become compatible just because the screw looks close.

The recessed socket is accessed from the screw head with a hex wrench. The maker lists applications such as machinery, instruments, electronic products, household appliances, lighting, toys, and locks. Those examples describe intended uses, not a guarantee that every screw is suitable for every device or load.

Practical tips

The clear organizer separates the contents into 10 compartments, and the sizes are marked with labels. Keeping each length in its labeled section can make it easier to find a replacement later instead of mixing small hardware on the bench. If you are sorting parts after a job, return them to the marked compartments so the remaining assortment stays useful.

Before assembly, check that the screw engages the matching thread smoothly and that its length works for the parts at hand. For critical or high-load assemblies, the product details here do not provide load ratings or tightening specifications, so this assortment alone cannot confirm suitability. It suits you if you regularly handle small assemblies and want several #4-40 lengths together. Not the best choice if your project needs another thread size, a supplied installation tool, or documented load limits.

Before you decide

What comes in the kit? It contains 254 pieces: #4-40 hex socket head cap screws in eight listed lengths, along with matching nuts and flat washers.

Is a hex wrench included? No. The screws use a recessed hex socket, and the wrench is not included.

How are the parts organized? They come in a clear plastic box with 10 compartments and labeled sizes, according to the maker.

When it makes sense

This kit makes sense for a repair bench or small assembly task where #4-40 hardware is already the right match and having several lengths in one organized box is more useful than buying a single length. It is a practical alternative to keeping only one screw size on hand, especially for removable panels and small parts. Choose a different assortment if you need another thread, need a hex wrench in the package, or must select fasteners using specifications beyond the material and dimensions provided here.