For eye bolts in A4 Stainless Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for A4 Stainless Steel (A4-80 (316)) is summarized below together with every size supplied.
Why Choose A4 Stainless Steel for Eye Bolts
Specified for marine, coastal and chemical applications. For eye bolts, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Eye Bolts in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless eye bolts: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Sizes of Eye Bolts Available in A4 Stainless Steel
| Thread size | Pitch (mm) | Ring inside diameter d (mm) | Ring outside diameter (mm) | Thread length (mm) | Max load vertical (kg) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| M6 | 1.0 | 20 | 36 | 12 | 70 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M8 | 1.25 | 25 | 45 | 16 | 140 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M10 | 1.5 | 30 | 54 | 20 | 230 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M12 | 1.75 | 36 | 63 | 24 | 340 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M14 | 2.0 | 42 | 72 | 28 | 500 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M16 | 2.0 | 45 | 81 | 32 | 700 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M18 | 2.5 | 50 | 90 | 36 | 930 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M20 | 2.5 | 56 | 99 | 40 | 1200 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M24 | 3.0 | 63 | 117 | 48 | 1800 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M30 | 3.5 | 80 | 144 | 60 | 3200 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M36 | 4.0 | 95 | 171 | 72 | 4600 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |