M12*25 Hex Flange Head Screws DIN 6921 Stainless Steel A2-70 High Strength Zinc Plated

Hex flange screws M12x25

M12x25 hex flange bolts

DIN 6921 flange screws

Hexagonal flange screws M12*25

Hex flange screws M12x25, compliant with DIN 6921 standards, feature an integrated washer for load distribution. These M12x25 hex flange bolts ensure secure fastening in machinery and construction applications. DIN 6921 flange screws provide vibration resistance and durability with hexagonal head design. Ideal for industrial use.

Specification

SEODescription

Hexagonal flange screws M12x25, compliant with DIN 6921 flange screws standard, feature an integrated hexagonal head with a flanged base (typical flange diameter 22mm) and M12x25 thread dimensions. These M12x25 hex flange bolts are designed for high-torque applications in automotive, machinery, and structural industries, offering a tensile strength of 8.8-12.9 grade (ISO 898-1). The flange distributes clamping force across a 2.5mm thick bearing surface, eliminating separate washers. Typical zinc-plated or hot-dip galvanized finishes provide corrosion resistance (-30°C to +120°C operational range). Advantages include vibration resistance through the flange's serrated underside (common 45HRC hardness), while limitations involve precise installation clearance requirements (minimum 19mm spanner size) and potential galvanic corrosion in mixed-metal environments. Compatible with ISO 4032 nuts and DIN 934 washers.

SEOSpecification

Parameter	Specification
Designation	Hex flange screws M12x25
Thread Size	M12 (Metric coarse)
Length	25 mm (underhead measurement)
Flange Diameter	24 mm (per DIN 6921)
Flange Thickness	3 mm
Head Height	8 mm
Hexagon Size	19 mm (AF width)
Material Grade	Class 8.8 (DIN 6921 flange screws)
Tensile Strength	800 MPa min
Surface Finish	Zinc-plated (5-8μm)
Standards	DIN 6921 / ISO 1665
Torque Value	95 Nm (lubricated)
Applications	M12x25 hex flange bolts for machinery, automotive, and structural assemblies

Note: Table contains technical specifications for DIN 6921-compliant flange bolts with integrated washer function. All values align with ISO metric fastener standards for M12 fasteners.

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SEOQandA_Product

question:How to prevent Hexagonal flange screws M12*25 from loosening under vibration?
answer:Use lock washers or thread-locking adhesive to secure the screws.
question:How to address corrosion on Hexagonal flange screws M12*25?
answer:Opt for stainless steel or coated screws for corrosion resistance.
question:How to ensure proper alignment during Hexagonal flange screw installation?
answer:Use alignment tools or guide fixtures to maintain correct positioning.
question:How to avoid flange damage during tightening?
answer:Apply calibrated torque tools to prevent over-tightening and flange deformation.
question:How to handle stripped hexagonal drive on the screw head?
answer:Replace damaged screws and use properly sized, undamaged hex tools for installation.