220PCS Black M4 Button Head Hex Socket Cap Screws Kit, 10.9 Alloy Steel, 30/35/40/45/50mm

What this kit contains

This is a 220-piece assortment of M4 button head socket cap screws in black. The screws come in five lengths, and each size has matching nuts, flat washers and lock washers in the same box. An L-shaped hex wrench for the socket drive is included.

M4 x 30mm screws

15 pcs

M4 x 35mm screws

10 pcs

M4 x 40mm screws

10 pcs

M4 x 45mm screws

10 pcs

M4 x 50mm screws

10 pcs

M4 hex nuts

55 pcs

M4 flat washers

55 pcs

M4 lock washers

55 pcs

Hex wrench

1 pc

The five screw sizes add up to 55 bolts, and the 55 nuts and 110 washers cover every one of them. Each compartment in the case is labeled with its size and count.

Specifications

Thread size

M4

Screw lengths

30, 35, 40, 45 and 50mm

Head style

Button head

Drive type

Hex socket

Material

Alloy steel, grade 10.9

Finish

Black

Total count

220 pieces

Case size

5.91 x 4.09 x 0.75 in

Package weight

9.59 oz (about 272 g)

Brand

Bemaka

Model

H-G061-BK-M4-220PCS

The heads are stamped 10.9, matching the grade printed on the case label.

Where these screws are used

This kit sits in the RC hardware category. M4 screws are a regular size on RC cars, trucks and crawlers, and they cover general repairs too: the maker lists mechanical equipment, electronics, furniture, toys and household appliances as applications.

A button head is low and rounded, so it needs less clearance than a cap head and has no sharp edges to catch on.

Choosing a length

Measure the total thickness of the parts you plan to clamp, then add room for a washer and a nut before picking a length.

The maker does not state the thread pitch. The nuts in the box match these screws, but if you plan to mix them with M4 hardware you already own, compare the threads first.