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 7991 / ISO 10642
Fastener Catalog & Standard Specification
Active: DIN 7991 / ISO 10642 (Countersunk Socket Screw (CSK))
Select a fastener below to view its data sheet
DIN 7991 / ISO 10642DIN STANDARDFull ThreadMetric Coarse
Countersunk Hex Socket Screws
Flat countersunk 90° head screw with internal hex socket, sitting flush with work surface upon tightening.
CAD Schematic
Nominal blueprint for M6
Engineering Schematic / CAD Dimension InspectorModel: M6 × 50mm
Nominal Thread (d)M6 P=1mm
Wrench / Allen (s)4mm e=4.58
Tap Drill DiameterØ 5 mm
Tensile Stress Area (Aₛ)20.1 mm²
Manufacturing & Drilling Engineering Notes
- • Overall length (L) includes the head depth (measured end-to-end).
- • Due to head geometry, countersunk screws have reduced loadability per ISO 898-1.
Size Specification Inspector
M6Select diameter & order quantity
Select Nominal Thread Diameter
Thread Pitch1 mm
Wrench (A/F Spanner s)4 mm
Recommended Tap DrillØ 5 mm
Clearance Hole (H13)Ø 6.6 mm
Tensile Stress Area (Aₛ)20.1 mm²
Single unit weight (steel): 0.0127 kg
Chemical Composition & Metallurgy
Elemental mass percentages, grain structure & mechanical properties
Elemental Composition (Mass %)
CCarbon0.33 - 0.48%
MnManganese0.40 - 0.80%
PPhosphorus0.020% max
SSulfur0.020% max
SiSilicon0.15 - 0.35%
CrChromium0.90 - 1.50%
MoMolybdenum0.20 - 0.40%
NiNickel0.50% max
FeIronBalance (~96.2%)
Mechanical Strength & Heat Treatment
Metallurgical Notes
- • Highest standard mechanical strength class in ISO 898-1.
- • Tempered at min 425°C to avoid temper embrittlement in the 250-350°C zone.
- • High susceptibility to hydrogen embrittlement and stress corrosion cracking (SCC).
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 | |
|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 2 | 2.3 | 1.7 | 2.5 | 3.4 | 5.03 | |
| M4 | 0.7 | 2.5 | 2.87 | 2.3 | 3.3 | 4.5 | 8.78 | |
| M5 | 0.8 | 3 | 3.44 | 2.8 | 4.2 | 5.5 | 14.2 | |
| M6 | 1 | 4 | 4.58 | 3.3 | 5 | 6.6 | 20.1 | |
| M8 | 1.25 | 5 | 5.72 | 4.4 | 6.8 | 9 | 36.6 | |
| M10 | 1.5 | 6 | 6.86 | 5.5 | 8.5 | 11 | 58 | |
| M12 | 1.75 | 8 | 9.15 | 6.5 | 10.2 | 13.5 | 84.3 | |
| M16 | 2 | 10 | 11.43 | 7.5 | 14 | 17.5 | 157 | |
| M20 | 2.5 | 12 | 13.72 | 8.5 | 17.5 | 22 | 245 |