[5-2-B] Carbon Steel Hex Bolt

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About this category

Property class 8.8 medium carbon steel hex bolts, noticeably stronger than plain zinc-plated bolts, for joints that need higher clamp load or carry structural stress. The head normally carries an 8.8 grade mark. Corrosion protection is limited - use stainless hex bolts in wet or outdoor locations.

Standards DIN 933 · DIN 931 · ISO 898-1

How to choose

• 8.8 is a strength class, not a size - a drawing calling for 8.8 cannot take an ordinary zinc bolt.
• Tighten to the recommended torque; over-tightening snaps the bolt at the thread root, which is hard to extract.
• Match the nut grade - a low-grade nut on an 8.8 bolt strips first.