SWEBOLT & BOTNIA BOLT supply partially threaded hex bolts according to ISO 4014 and DIN 931, in property class 8.8 per ISO 898-1, with metric coarse thread (M) and a plain (uncoated) surface. These bolts are primarily used in dry or indoor environments, but can also be surface treated on request through our partner network. A cost-effective solution for construction, industry, and maintenance, where corrosion protection is not required as standard.