Material page for heat-set threaded inserts for plastic 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 Heat-Set Threaded Inserts for Plastic
Specified for marine, coastal and chemical applications. For heat-set threaded inserts for plastic, 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 Heat-Set Threaded Inserts for Plastic in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Heat-Set Threaded Inserts for Plastic, 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
Stainless steel is more noble than aluminum, so with an electrolyte present — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. Area ratio decides how bad it gets: a small stainless fastener in a large aluminum section is normally acceptable, a large stainless fastener in thin aluminum is not. Where the joint gets wet, isolate the metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.
Sizes of Heat-Set Threaded Inserts for Plastic Available in A4 Stainless Steel
| Thread size | Outer diameter (mm) | Length L (mm) | Hole in parent (mm) | Recommended boss OD (mm) | Knurl bands | Installation |
|---|---|---|---|---|---|---|
| M2 | 3.2 | 3.0 | 3.0 | 6.4 | 2 | Heated tip, 200-250 u00b0C |
| M2.5 | 3.6 | 4.0 | 3.4 | 7.2 | 2 | Heated tip, 200-250 u00b0C |
| M3 | 4.6 | 4.0 | 4.4 | 9.2 | 3 | Heated tip, 200-250 u00b0C |
| M3 | 4.6 | 5.7 | 4.4 | 9.2 | 3 | Heated tip, 200-250 u00b0C |
| M4 | 5.6 | 5.7 | 5.4 | 11.2 | 3 | Heated tip, 200-250 u00b0C |
| M5 | 6.9 | 5.8 | 6.7 | 13.8 | 3 | Heated tip, 200-250 u00b0C |
| M6 | 8.2 | 9.5 | 8.0 | 16.4 | 3 | Heated tip, 200-250 u00b0C |
Dimensions are independent of the material: the table above lists the sizes supplied, and on this page every one of them is quoted in A4 Stainless Steel. The catalogue's default material column has been omitted here so it cannot be read as contradicting that.
Custom manufacturing · Made to drawing
Need this threaded insert in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. Thread size, body length, knurl or key form and installation method are all variable against the parent material. Made by tapping or knurling.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
