Stainless Steel Hex Flange Head Bolt Grade Specification, Uses

Stainless Steel Flange Head Bolt - Grade 202, 304, 316, A2, A2-70

The Hexagon Flange Bolt is a durable fastening solution specifically designed to withstand high-stress environments. Its hexagonal head and built-in flange provide superior grip and strength while also evenly distributing the load and preventing loosening from vibration. Ideal for industrial and structural purposes, these bolts come in galvanized or zinc-coated finishes, offering excellent protection against corrosion. From automotive to construction to heavy machinery, the Hexagon Flange Bolt conforms to strict international standards for reliable performance and long-lasting durability.

DIN 6921
Size	Length
Size	F/T	H/T
M6	20 - 40	30 - 60
M8	25 - 50	35 - 80
M10	25 - 50	40 - 100

Hex Socket Flange Button Head Screw – Metric Specification Table

Thread Size (M)	Thread Pitch (mm)	Head Diameter (Dk)	Flange Diameter (Dw)	Head Height (K)	Across Flats (S)	Typical Property Class
M5	0.8	8.5 mm	11.8 mm	5.0 mm	8.0 mm	8.8 / 10.9 / A2-70
M6	1.0	10.0 mm	14.2 mm	6.0 mm	10.0 mm	8.8 / 10.9 / A2-70
M8	1.25	13.0 mm	17.9 mm	8.0 mm	13.0 mm	8.8 / 10.9 / A2-70
M10	1.5	16.0 mm	21.8 mm	10.0 mm	15.0 mm	8.8 / 10.9 / A2-70
M12	1.75	18.0 mm	26.0 mm	12.0 mm	18.0 mm	8.8 / 10.9 / A2-70
M16	2.0	24.0 mm	32.0 mm	16.0 mm	24.0 mm	8.8 / 10.9

Standard: DIN 6921 / ISO 1665
Material: Carbon Steel (Class 8.8/10.9), Stainless Steel (A2/A4), Alloy Steel
Coating Options: Zinc plated, Hot-dip galvanized, Black oxide
Head Style: Hexagonal head with integrated serrated flange
Thread Type: Metric, coarse (fine threads optional)

Torque Chart – Hex Flange Head Bolts (Metric, Class 8.8)

Bolt Size	Thread Pitch	Across Flats (mm)	Max Torque (Unlubricated)	Max Torque (Lubricated)
M5	0.8 mm	8 mm	6.0 Nm	4.5 Nm
M6	1.0 mm	10 mm	10.0 Nm	7.5 Nm
M8	1.25 mm	13 mm	25.0 Nm	18.0 Nm
M10	1.5 mm	15 mm	49.0 Nm	37.0 Nm
M12	1.75 mm	18 mm	86.0 Nm	64.0 Nm
M14	2.0 mm	21 mm	138.0 Nm	103.0 Nm
M16	2.0 mm	24 mm	210.0 Nm	160.0 Nm

Lubricated values are approximately 25–30% lower due to reduced friction.
For Property Class 10.9, increase torque values by ~30%.
For stainless steel bolts (A2-70), reduce torque by ~20–25% to avoid galling.
Always verify torque values for critical assemblies from the manufacturer or engineering documentation.

A Hex Flange Head Bolt is a type of fastener characterized by its hexagonal (six-sided) head and integrated flange. These bolts are designed for secure fastening in various applications, providing a larger bearing surface and reducing the need for a separate washer.

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

Integrated Flange

The presence of the flange beneath the head eliminates the necessity for a separate washer, streamlining assembly and potentially reducing material expenses.

Load Distribution

The use of the flange evenly spreads the clamping force, safeguarding the fastened material and enhancing the stability of the joint.

Vibration Resistance

Thanks to their flange design, these components are ideal for use in situations involving moving parts or high stress, as it helps prevent loosening from vibrations.

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