Material page for spring toggle anchors in A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is superior, including marine and chloride environments and the service range is approx. -200 °C to +400 °C, subject to the property class and the joint.
Why Choose A4 Stainless Steel for Spring Toggle Anchors
Specified for marine, coastal and chemical applications. For spring toggle anchors, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| 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 Spring Toggle Anchors in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Spring Toggle Anchors, the alternative stainless grade is A2 (304). Choose A2 (304) for general use and A4 (316) wherever chlorides are present; the molybdenum in A4 is the whole difference. Remember that stainless is the corrosion answer, not the strength answer — for load, look at class 8.8 or 10.9 instead.
Using Stainless Fasteners in Aluminum
The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.
Sizes of Spring Toggle Anchors Available in A4 Stainless Steel
| Screw size | Drill hole diameter (mm) | Open span (mm) | Wall thickness range (mm) | Minimum cavity depth (mm) | Screw length range (mm) | Material | Retrievable |
|---|---|---|---|---|---|---|---|
| M4 | 13 | 55 | 9~25 | 45 | 50~100 | Zinc plated steel | No — drops into cavity |
| M5 | 16 | 70 | 9~35 | 55 | 60~120 | Zinc plated steel | No — drops into cavity |
| M6 | 19 | 85 | 9~50 | 70 | 75~150 | Zinc plated steel | No — drops into cavity |
| M8 | 22 | 100 | 12~60 | 85 | 100~200 | Zinc plated steel | No — drops into cavity |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this anchor & concrete fixing in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. Embedment depth, thread size, body length and corrosion protection are the variables; capacity remains a concrete design value, not a property of the anchor alone. Made by hot forging or thread rolling.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
