Sutemribor Sutemribor-Screws M4 x 40mm Socket Head Cap Screws, 12.9 Grade

If your assembly calls for fully threaded M4 x 40mm socket head cap screws, this Sutemribor set provides 55 black oxide-finished screws with a 0.7mm thread pitch. The listing identifies the material as 12.9 grade alloy steel and the drive as an internal hex.

That combination suits machine assembly and removable panels where a recessed hex drive is useful. The dimensions and drive style are specific, so matching them to the existing fastener and the available tool matters.

Key points

The set contains 55 screws, each listed as M4 x 40mm and fully threaded. The metric thread pitch is 0.7mm, while the socket head uses an internal hex drive. These details help distinguish the set from shorter screws, partially threaded fasteners, or screws with a different head and drive style.

Sutemribor describes the screws as 12.9 grade alloy steel with a black oxide finish. That gives buyers the stated material and finish when comparing replacement fasteners or organizing parts for an assembly. The listing also describes the screws as right-hand threaded. It does not provide head dimensions or a hex wrench size, so those details cannot be used to confirm a match from the product information alone.

How it fits

The key fit points are the M4 thread, 0.7mm pitch, and 40mm length. They are suitable to consider when an existing design or fastener specifies those same measurements, the listing does not establish compatibility with any particular machine or product. The fully threaded shank may be relevant when the full screw length needs threads, rather than an unthreaded section beneath the head.

The recessed hex drive is intended for use with a hex wrench. Compared with choosing a screw by length alone, checking thread diameter, pitch, length, and head style together is a more reliable way to narrow down a replacement. You’ll appreciate it if your project already calls for this exact metric size and socket-head format. You may want to skip it if your assembly specifies a different thread, length, or drive type.

Everyday use

For a removable machine panel, for example, the set provides multiple matching fasteners for the same assembly. The socket drive can be useful where access favors a tool engaging inside the head, and the screws can be removed and reinstalled as needed. The product information lists machinery, precision instruments, electronics, appliances, locks, lighting, and toys among possible applications, but the correct size and strength requirements still depend on the specific assembly.

One package detail is unclear: the feature text says a hex wrench is included, while the package list names 55 screws only. Treat the wrench as unconfirmed unless the seller clarifies the contents. This set is a focused choice for a specified M4 x 40mm fastener, rather than a mixed-size assortment for jobs where the required screw dimensions are not yet known.

Practical questions

What thread pitch is listed? The metric pitch is 0.7mm.

Are the screws fully threaded? Yes. The product details describe the M4 x 40mm screws as fully threaded.

Does the package include a hex wrench? The listing gives conflicting package information: one section mentions a wrench, while the package list specifies 55 screws. The contents are therefore not clear from the available details.

Should you buy it?

Choose this set when your parts list calls for M4 x 40mm socket head cap screws with a 0.7mm pitch and you want 55 of the same black oxide-finished fastener. It is less suited to an open-ended repair where the thread, length, or head style has not been identified. Confirming those specifications against the assembly is the practical deciding step, the product listing does not name a particular compatible machine or application.