M42-4.50 x 240mm Socket Head Cap Screws, Partial Thread / Class 12.9 Steel / Thermal Black Oxide / ISO 898-1 Class 12.9; DIN 912
$1,089.91
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Product Description
M42-4.50 x 240mm Socket Head Cap Screws, Partial Thread / Class 12.9 Steel / Thermal Black Oxide / ISO 898-1 Class 12.9; DIN 912
Specifications
| Material | Alloy Steel |
|---|---|
| Finish | Thermal Black Oxide |
| Grade | Class 12.9 |
| Size | M42-4.50 |
| Length | 240mm |
| Head Style | Socket Head |
| Drive | Hex Socket (Allen) |
| Thread Pitch | 4.50mm |
| Thread Class | Coarse |
| Hardness | C39 - C44 |
| Tensile Strength | 174000 |
| Standard | DIN 912 |
| RoHS Compliance | RoHS Compliant |
| Measurement System | Metric |
RoHS Compliant
Frequently Asked Questions
What does the metric class number mean?
The first number indicates tensile strength (e.g., 12 = 1,200 MPa). The second number is the yield-to-tensile ratio. So Class 12.9 has 1,220 MPa tensile strength and yield at 90% of tensile. Class 12.9 is equivalent to inch Grade 8.
What hex key size do I need for this socket head cap screw?
Hex socket size depends on the screw thread size. Common sizes: #6 uses 7/64", #8 uses 9/64", #10 uses 5/32", 1/4" uses 3/16", 5/16" uses 1/4", 3/8" uses 5/16". For metric: M3 uses 2.5mm, M5 uses 4mm, M6 uses 5mm, M8 uses 6mm, M10 uses 8mm.
Does Black Oxide finish provide corrosion protection?
Black Oxide provides mild corrosion resistance through a controlled oxidation process. It is dimensionally stable (no plating buildup), will not chip or flake, and is suitable for indoor use. For outdoor or wet environments, additional oil coating or a different finish (zinc, stainless) is recommended.
.50 x 5mm Socket Head Cap Screw, Full Thread / Class 12.9 Steel / Black Oxide
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Technical Specifications
Thread Size
M42-4.50
Thread Type
Metric Coarse
Material
Alloy Steel
Grade
Class 12.9
Head Style
Socket Head
Thread Pitch
4.50mm
Tensile Strength
174000
Hardness
C39 - C44
SKU
532791-4