Stainless Steel Flange Nut - Grade 202, 304, 316, A2, A2-70

A flange nut is a hex nut with an integrated wide flange at one end. This flange acts like a built-in washer, distributing pressure more evenly and preventing damage to the part being secured.

Flange Nut Technical Specification – Metric (DIN 6923)

Nominal Size (d)	Pitch (mm)	Width Across Flats (A/F) (mm)	Flange Diameter (Dk) (mm)	Nut Height (H) (mm)	Min. Proof Load (MPa)
M5	0.8	8.0	11.8	5.0	500–800
M6	1.0	10.0	14.2	6.0	500–800
M8	1.25	13.0	17.9	8.0	500–800
M10	1.5	15.0	21.8	10.0	600–1,000
M12	1.75	17.0	26.0	12.0	600–1,000
M14	2.0	19.0	29.9	14.0	600–1,000
M16	2.0	22.0	34.5	16.0	600–1,000
M20	2.5	27.0	43.0	20.0	600–1,000
M24	3.0	30.0	50.0	24.0	600–1,000

Materials and Grades

Material	Standard/Grade	Surface Finish
Carbon Steel	Class 8 / 10	Zinc plated, black oxide
Stainless Steel (A2/A4)	AISI 304 / 316	Plain / Passivated
Alloy Steel (Hardened)	Grade 10	Phosphated, zinc flake
Brass	-	Natural finish

A specialized washer is utilized to accommodate a flange nut. This component is commonly employed in the aerospace sector. Omitting this nut would require spot facing the object in order to create a perpendicular surface for the fastener.

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 Washer

The flange on a flange nut has the same function as a standalone washer. It helps evenly spread the clamping force and prevents the nut from creating indentations in the material.

Increased Bearing Surface

By offering a broader area for the nut to rest against, the flange minimizes the chance of it coming loose from vibration or uneven surfaces.

Improved Holding Power

Flange nuts aid in creating a stable and trustworthy connection by evenly distributing weight and preventing the nut from sinking into the material.

Reduced Risk of Damage

Furthermore, the increased surface area of the bearing also serves to reduce the potential for harm to the material being fastened, particularly in cases involving softer materials.

Variety of Materials and Finishes

Different materials and finishes of flange nuts are offered to accommodate a range of applications and environments. Options include stainless steel, carbon steel, and alloy steel.

Serrated Flange

Certain flange nuts have serrations on their surface that can increase their locking capability by creating a gripping effect against the adjoining surface.

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