A2 Stainless Steel EPDM Rubber Well Nuts are supplied to our own published dimensions — this is a trade-series article rather than one covered by a dimensional standard, so confirm the figures against the part you are replacing. The grade provides good general corrosion resistance and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint.
Why Choose A2 Stainless Steel for EPDM Rubber Well Nuts
The most common stainless group for indoor and general outdoor fasteners. For epdm rubber well nuts, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |
Galvanic & Galling Considerations
Two important notes for stainless epdm rubber well nuts: (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.
Comparable Grades
For EPDM Rubber Well Nuts, the alternative stainless grade is A4 (316). 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 EPDM Rubber Well Nuts Available in A2 Stainless Steel
| Thread size | Representative hole diameter (mm) | Representative grip range (mm) | Temperature range (u00b0C) | Representative tightening torque (Nu00b7m) | Body / insert |
|---|---|---|---|---|---|
| M3 | 8.0 | 0.4~4.0 | -30~+80 | 0.5 | EPDM rubber / stainless threaded insert |
| M4 | 8.0 | 0.4~4.0 | -30~+80 | 0.4 | EPDM rubber / stainless threaded insert |
| M5 | 9.7 | 0.4~4.9 | -30~+80 | 0.6 | EPDM rubber / stainless threaded insert |
| M6 | 12.8 | 0.4~4.0 or 0.8~4.7 | -30~+80 | 1.0 | EPDM rubber / stainless threaded insert |
| M8 | 16.0 | 0.4~4.0 | -30~+80 | 1.5 | EPDM rubber / stainless threaded insert |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
