Electro-galvanizing, hot-dip galvanizing, Geomet, phosphate and black oxide coatings; quenching and tempering in our own plant.
Depends on coating
Coating largely determines the life of a fastener. In our in-house lines you can choose the coating that suits your environment.
Coating options
- Electro-galvanizing (Zn): 5-12 µm, indoor; 48-96 hours salt spray
- Hot-dip galvanizing (HDG): 45-80 µm, outdoor and steel construction
- Geomet / Dacromet: Cr(VI)-free, 480-1,000 hours; no hydrogen embrittlement risk for 10.9 and 12.9
- Phosphate + oil: Friction-controlled for automotive and assembly lines
On our heat treatment line, quenching and tempering is applied for classes 8.8, 10.9 and 12.9; hardness samples are taken from each furnace load.
Scope of service
- Electro-zinc, HDG, Geomet, phosphate
- Cr(VI)-free coatings
- Up to 1,000 hours salt spray
- Hardness check on every furnace load
Coating and Heat Treatment — get a quote
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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Older German standards such as DIN 933 and DIN 931 have largely been replaced by ISO 4017 and ISO 4014.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.