VDI 2230-based joint calculations, torque-preload tables and assembly instructions to prevent failures from incorrect tightening.
Free for ordering customers
Most bolt failures come not from the material but from wrong tightening and wrong selection. Our application engineers calculate your joint using the VDI 2230 method and recommend the suitable strength class, coating and tightening method.
Services
- Preload, torque and angle-method calculations
- Loosening analysis under vibration, locking recommendations
- Galvanic corrosion (dissimilar metals) warnings
- Assembly instructions and torque wrench selection
You can also use the torque and weight calculators on our site for quick checks at the preliminary design stage.
Scope of service
- VDI 2230-based calculation
- Loosening and locking analysis
- Galvanic corrosion warnings
- Assembly instructions
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Frequently asked questions
What is the difference between DIN and ISO standards?
Older German standards such as DIN 933 and DIN 931 have largely been replaced by ISO 4017 and ISO 4014. Most dimensions are the same; for M10 and M12 the wrench size is 17/19 mm in DIN and 16/18 mm in ISO. State the standard clearly when ordering.
What do 8.8 and 10.9 mean?
The first number is tensile strength divided by 100 (8 → 800 MPa), the second the yield/tensile ratio (0.8 → 640 MPa yield). 10.9: 1,000 MPa tensile, 900 MPa yield; 12.9: 1,200 MPa tensile, 1,080 MPa yield.
Which coating should I choose?
For indoor use, electro-galvanizing (5-12 µm); for outdoor and steel construction, hot-dip galvanizing; for high-strength (10.9 / 12.9) and corrosion-resistant applications, Geomet. Electrolytic coating carries a hydrogen embrittlement risk for 10.9 and above.
Is there a minimum order quantity?
Catalog products are sold by carton (usually 100-1,000 pieces). The minimum batch for special manufacturing is 5,000 pieces. Minimum purchase terms for dealers vary by tier.
How do I get certificates?
An EN 10204 3.1 certificate is issued for every lot. Enter the lot number on the product label into the certificate lookup tool on our site to download the PDF report. For 3.2, you must request it with the order.