Engineering Data Sheets
Fastener Data Sheets& CAD
Browse ISO, DIN, ASTM and ASME fastener standards with dimensional specifications, CAD blueprints, drilling & clearance data, chemical composition and mechanical properties.
Reference: DIN 9021 / ISO 7093
Fastener Catalog & Standard Specification
Active: DIN 9021 / ISO 7093 (Fender / Large OD Washer)
Select a fastener below to view its data sheet
DIN 9021 / ISO 7093DIN STANDARDNon-ThreadedMetric Coarse
Large Outer Diameter Flat Washers (Fender / Mudguard)
Heavy wide-rim washer with outer diameter approximately 3× nominal bolt diameter, providing maximum load distribution.
CAD Schematic
Nominal blueprint for M6
Engineering Schematic / CAD Dimension InspectorModel: M6
Nominal Thread (d)M8 P=1.25mm
Wrench / Allen (s)13mm e=14.38
Tap Drill DiameterØ 6.8 mm
Tensile Stress Area (Aₛ)36.6 mm²
Manufacturing & Drilling Engineering Notes
- • Outer diameter $d_2 \approx 3 \times d_1$. Excellent for spanning oversized or slotted clearance holes.
Size Specification Inspector
M6Select diameter & order quantity
Select Nominal Thread Diameter
Thread Pitch1.25 mm
Wrench (A/F Spanner s)13 mm
Recommended Tap DrillØ 6.8 mm
Clearance Hole (H13)Ø 9 mm
Tensile Stress Area (Aₛ)36.6 mm²
Chemical Composition & Metallurgy
Elemental mass percentages, grain structure & mechanical properties
Elemental Composition (Mass %)
CCarbon0.25 - 0.55%
MnManganese0.60 - 1.20%
PPhosphorus0.025% max
SSulfur0.025% max
SiSilicon0.15 - 0.35%
CrChromium0.20 - 0.50% (Optional)
BBoron0.0008 - 0.005% (Boron-treated)
FeIronBalance (~97.5%)
Mechanical Strength & Heat Treatment
Metallurgical Notes
- • Quenched and tempered at min 425°C to achieve fine tempered martensite microstructure.
- • Meets ISO 898-1 / ASTM F568M Class 8.8 specifications.
- • Boron-alloyed steels must contain min 0.0008% active Boron for hardenability.
Dimensional Specification
Thread / Pitch / Across Flats / Corners / Height / Drill / Clearance / Stress Area (mm)
| Thread (d) | Pitch | A/F (s) | Corners (e) | Height | Tap Drill | Clear H13 | Stress Area |
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