Stainless Steel Hex Socket Button Head Screw Grade Specification

Stainless Steel Hex Socket Button Head Screw - Grade 202, 304, 316, A2, A2-70

A Hex Socket Button Head Screw is a type of fastener characterized by a rounded, low-profile head with a hexagonal socket (Allen drive) in the center. These screws are typically used where a smooth, finished appearance is desired along with secure fastening. Grade 202, 304, 316

ISO 7380		ANSI B 18.3
Size	Length	Size	Length
M3	12-20	1/4"	1/2" - 1 1 /2"
M4	12-30	5/16"	3/4" - 2 1/2"
M5	12-40	3/8"	3/4" - 2 1/2"
M6	12-40	7/16"	1" - 3"
M8	20-70	1/2"	1" - 3 1/2"
M10	20-100	-	-
M12	20-100	-	-

Button Head Socket Screw – Technical Specification (Metric)

Nominal Size (d)	Thread Pitch (P)	Head Diameter (D)	Head Height (K)	Hex Socket Size (S)	Tensile Strength (Class	Hardness Max
M3	0.5 mm	5.7 mm	1.65 mm	2 mm	700 MPa	250 HB
M4	0.7 mm	7.6 mm	2.2 mm	2.5 mm	700 MPa	250 HB
M5	0.8 mm	9.5 mm	2.75 mm	3 mm	700 MPa	250 HB
M6	1.0 mm	10.5 mm	3.3 mm	4 mm	700 MPa	250 HB
M8	1.25 mm	14 mm	4.4 mm	5 mm	700 MPa	250 HB
M10	1.5 mm	17.5 mm	5.5 mm	6 mm	700 MPa	250 HB
M12	1.75 mm	21 mm	6.6 mm	8 mm	700 MPa	250 HB

Standard: DIN 7380 / ISO 7380 (button head, hex socket)
Property Class: Usually Class 8.8 or stainless steel A2-70
Applications: Non-structural, moderate load environments
Socket Depth: Shallower than standard socket head screws; use torque carefully

Torque Chart – Button Head Socket Screws (Metric, Class 8.8)

Size (Thread	Thread Pitch	Torque (Nm) – Unlubricated	Torque (Nm) – Lubricated
M3	0.5 mm	1.2 Nm	0.9 Nm
M4	0.7 mm	2.8 Nm	2.1 Nm
M5	0.8 mm	5.5 Nm	4.1 Nm
M6	1.0 mm	9.5 Nm	7.1 Nm
M8	1.25 mm	23 Nm	17 Nm
M10	1.5 mm	46 Nm	35 Nm
M12	1.75 mm	79 Nm	60 Nm

Button Head Socket Screws from Gem Star are top-quality fasteners prized for their sleek, rounded heads. Used in a variety of industrial settings, they boast exceptional strength, longevity, and accuracy. These screws adhere to strict industry guidelines and consistently deliver unparalleled results. Our comprehensive size charts, drawings, and images make it easy to choose and use them with confidence.

Tensile Strength

≥700 MPa

Yield Strength

≥1100 MPa

Elongation

≥12%

Hardness Max

250 HB

Materials

Stainless Steel

Steel Grade

Finishing

Polished
Geomet
Dacromet
Teflon
Hot-Dip Galvanzing
Zinc (Yellow, White, Blue)
Black Qxide

Thread

Standards

Rounded Head

The button head offers a streamlined appearance and minimized risk of catching, resulting in enhanced visual appeal.

Hexagonal Socket

The internal hexagonal socket ensures a secure grip when using either a hex key or Allen wrench to tighten or loosen.

Versatile Application

Button head screws are a versatile option for a range of uses such as furniture, machinery, and electronics. They provide a sleek and unobtrusive solution where a neat and low-profile fastener is required.

Material Options

These materials, including stainless steel, carbon steel, and alloy steel, offer a variety of strength levels and protection against corrosion.

Standard Compliance

Button head screws are commonly produced to meet standards, such as ISO 7380-1, which guarantee uniform dimensions and thread tolerances.

Space Efficiency

The low-profile head enables their use in tight spaces or areas where a flush surface is critical.

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