Sutemribor M4 Socket Head Cap Screw Set

The seven screw lengths make this 385-piece M4 set useful when a repair or assembly calls for more than one fastener size. Matching nuts and washers are included, so the basic hardware is together in one kit.

The screws are black 12.9-grade alloy steel with hex socket heads. That recessed drive is designed for a hex wrench, which gives you a compact fastening option for machinery and removable panels.

A clear box separates the contents into labeled compartments. That can make it easier to find the length you need at the workbench instead of sorting loose hardware each time.

Fit and sizing

The set includes M4 screws in lengths of 5, 6, 8, 10, 12, 16, and 20 mm, along with matching nuts, lock washers, and flat washers. The range is handy for small assembly jobs where panel thickness or fastening depth varies. For example, when reattaching a removable panel, you can compare the available lengths and choose one suited to the parts being joined rather than reaching for a single-size box.

The listing gives the total piece count, but not how many pieces of each length or washer type are included. If a project needs a specific quantity of one size, that missing breakdown matters. Also, the hex wrench is not included, so you’ll need the right tool on hand to install or remove the screws.

Pros

• Seven M4 lengths provide more flexibility than a kit built around one screw length.
• Matching nuts, lock washers, and flat washers support common fastening setups.
• The recessed hex socket head is intended for use with a hex wrench and is described as less prone to slipping at the corners than some drive styles.
• Labeled compartments keep the different sizes organized for storage and repeat use.

You’ll appreciate it if you handle small machine assemblies, electronics, household-appliance repairs, or other projects that use M4 hardware and benefit from having several lengths available. If you only need a few fasteners for one job, a smaller, size-specific purchase may be simpler. It may not suit you if you need a guaranteed count for each length, since the supplied description does not provide that breakdown.

Spec sheet

• Type: Hex socket head cap screw assortment
• Size: M4, screw lengths of 5, 6, 8, 10, 12, 16, and 20 mm
• Material: 12.9-grade alloy steel
• Color: Black
• Format: 385-piece set with screws, nuts, lock washers, and flat washers

The screws are described as having high strength and resistance to wear and corrosion. Those properties may be relevant for hardware used in demanding environments, but the listing does not give application-specific limits or a performance test. Match the fastener to the parts and conditions of your project rather than treating the grade alone as a guarantee.

Is it worth it?

This set makes sense if you regularly need M4 fasteners in different lengths and want nuts and washers stored alongside them. The labeled compartments are a practical touch for recurring bench work: you can open the box, locate a marked size, and get back to assembling a panel or small mechanism. For occasional use, though, the 385-piece assortment may be more hardware than necessary, and you’ll still need to supply a hex wrench. I’m assessing the listed features without having tried it, so the key buying question is whether its M4 range and included hardware match your actual project—not simply whether a larger assortment sounds convenient.