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Stainless Hex Flange Bolts (DIN 6921 / ISO 4162) - A2-70 / A4-80 - SS304 / SS316 - hex head with integral load-bearing flange; primary product view

Stainless Hex Flange Bolts

StandardDIN 6921 · ISO 4162 · OEM
MaterialSS304 / SS316
Strength GradeA2-70 / A4-80
Size RangeM5-M16
Surface TreatmentPassivated
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01

Product Description

Product Description & Key Specifications

DIN 6921 / ISO 4162 stainless hex flange bolts are supplied in SS304 / SS316 with A2-70 / A4-80 grade options for bracket, clamp and equipment assemblies that benefit from an integrated wide bearing surface. Common range is M5-M16 with passivated finish and OEM flange geometry on request.

The flange head spreads load over a larger bearing area than a standard hex head and can reduce the need for a separate washer in selected assemblies. It does not replace engineering checks for soft materials, slotted holes, high vibration or critical structural joints, where washer and locking requirements should follow the drawing.

SS304 / A2 is suitable for general outdoor equipment, while SS316 / A4 is preferred for coastal, marine and washdown exposure. Serrated or non-serrated flange face, flange diameter, head height and thread length should be confirmed by drawing.

Product typeStainless hex flange bolts
StandardsDIN 6921 / ISO 4162 / OEM reference
MaterialSS304 / SS316
Strength gradeA2-70 / A4-70 / A4-80
Size rangeM5-M16, with length confirmed by order
Common modelsM6 x 16, M8 x 20, M8 x 25, M10 x 30, M12 x 35
Head / bearingHex flange head, serrated or non-serrated by drawing
Surface finishPassivated stainless surface
DocumentationCoC, material certificate and dimensional report on request
Dimensions & SpecificationsDIN 6921 / ISO 4162

Technical Drawing

DIN 6921 technical drawing

Dimensional Table

ParameterM5M6M8M10M12M14M16M20
P0.811|1.251|1.25|1.51.25|1.5|1.751.5|21.5|21.5|2.5
da/max5.76.89.211.213.715.717.722.4
dc/max11.814.21822.326.630.53543
ds/max5681012141620
ds/min4.825.827.789.7811.7313.7315.7319.67
e/min8.7110.9514.2616.517.6219.8623.1529.87
Lf/max1.42223334
k/max5.46.68.19.211.512.814.417.1
r/min0.250.40.40.40.60.60.60.8
s/max810131516182127
s/min7.789.7812.7314.7315.7317.7320.6726.67

Engineering references

Technical resources

Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.
Dimensions and drawingCustom & Non-Standard DIN 6921 Hexagon bolts with flangeOpen drawing →Standard cross-referenceDIN 6921 vs ISO 4162: equivalents and replacement guideOpen cross-reference →
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Selection

Selection Advantages by Application

Solar Brackets & Clamp Assemblies

M8 and M10 stainless flange bolts are common for PV clamps, rails and brackets where a wide bearing face is useful. SS316 / A4 is preferred for coastal solar installations.

Renewable energy fasteners

Equipment Panels & Frames

M6, M8 and M10 flange bolts support covers, frame brackets and equipment panels where washer reduction and fast assembly are desired. Confirm serrated or non-serrated flange requirements.

Construction fasteners

Marine Stainless Hardware

SS316 / A4 passivated flange bolts are suitable for selected marine brackets and covers exposed to wet outdoor service. Common RFQ models include M8 x 20, M10 x 30 and M12 x 35.

Marine fasteners

Railway Auxiliary Equipment

M6, M8 and M10 stainless flange bolts can be used for cabinets, covers and non-primary brackets where external hex access and wide bearing support are useful.

Railway fasteners
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Assembly

Recommended Matching Products

Stainless Hex Nuts (DIN 934 / ISO 4032) - A2-70 / A4-80 - SS304 / SS316 - hex body with internal thread; primary product view
Stainless Hex NutsMating nuts for through-bolted flange bolt assemblies.
Stainless Flat Washers (ISO 7089 / DIN 125) - SS304 / SS316 - washer profile with central bore; primary product view
Stainless Flat WashersAdditional bearing washer where the drawing requires it despite flange head use.
Stainless Nylon Insert Lock Nuts (DIN 985 / DIN 982) - A2-70 / A4-80 - SS304 / SS316 with Nylon Insert - hex nut body with visible nylon locking insert; primary product view
Stainless Nylon Insert Lock NutsPrevailing-torque nut option for vibration-resistant assemblies.
Stainless Hex Head Bolts (Full Thread) (DIN 933 / ISO 4017) - A2-70 / A4-80 - SS304 / SS316 - continuous thread along the fastener body; primary product view
Stainless Hex Head Bolts (Full Thread)Alternative standard hex bolt when flange head is not required.
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Manufacturing

Manufacturing & Quality Control

Manufacturing CapabilityQuality Control
Cold forming or hot forging selected by size and flange geometryIncoming SS304 / SS316 material verification
Thread rolling and flange head formingThread gauge, flange diameter and head height inspection
Passivation and stainless surface finishingVisual inspection for flange defects, serration damage and burrs
Serrated or non-serrated flange face by drawingTensile, hardness or salt-spray tests arranged when specified
Bulk, small-box or project kit packagingCoC, MTC and inspection report prepared on request
05

FAQ

Common Questions Before RFQ

When should I use a stainless hex flange bolt?

Use a hex flange bolt when the assembly benefits from an integrated wider bearing face and external hex drive access. Confirm whether the flange can replace a washer in your specific joint design.

What is the difference between DIN 6921 and ISO 4162?

DIN 6921 and ISO 4162 are common references for hex flange bolts. Some dimensions and flange details may differ, so the project drawing or required standard should be confirmed before ordering.

Should I choose serrated or non-serrated flange bolts?

Serrated flange bolts can improve resistance to rotation but may mark mating surfaces. Non-serrated flange bolts are preferred where surface marking or coating damage is a concern.

What sizes are commonly requested?

Common RFQ models include M6 x 16, M8 x 20, M8 x 25, M10 x 30 and M12 x 35 stainless flange bolts. Final length, thread length and flange form should follow the drawing.

Is passivation available?

Yes. Passivation is available for SS304 and SS316 stainless hex flange bolts to improve stainless surface condition after forming and threading.

Need DIN 6921 / ISO 4162 stainless flange bolts?

Send your standard, size, length, material, grade, serrated or non-serrated flange requirement, finish and certificate needs. Our team can confirm the suitable stainless flange bolt specification.

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