A4 Stainless Steel Push-In Pneumatic Fittings 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 superior, including marine and chloride environments 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 A4 Stainless Steel for Push-In Pneumatic Fittings
Specified for marine, coastal and chemical applications. For push-in pneumatic fittings, 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 |
Galvanic & Galling Considerations
Two important notes for stainless push-in pneumatic fittings: (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 Push-In Pneumatic Fittings, the alternative stainless grade is A2 (304). The practical dividing line is chlorides: A2 (304) is fine until salt is involved, and A4 (316) exists for the cases where it is — coastal, marine and road-salt service. Neither reaches the strength of a plated class 8.8 or 10.9 fastener.
Using Stainless Fasteners in Aluminum
Expect the aluminum to corrode, not the fastener — stainless sits higher in the galvanic series, so the aluminum is the one that gives up material. A small fastener in a thick section spreads the loss over a large area and is usually fine; a large fastener in thin sheet concentrates it and is not. Keep water out of the joint, or isolate the two metals with a nylon or coated washer and a sealant.
Sizes of Push-In Pneumatic Fittings Available in A4 Stainless Steel
| Tube OD (mm) | Thread size | Flow ref (Nl/min) | Max pressure (bar) | Pull-out force (N) | Reference standard | Notes |
|---|---|---|---|---|---|---|
| 4 | M5x0.8 | 80 | 10 | 70 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 4 | 1/8 BSP | 80 | 10 | 70 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 6 | M5x0.8 | 200 | 10 | 120 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 6 | 1/8 BSP | 200 | 10 | 120 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 6 | 1/4 BSP | 200 | 10 | 120 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 8 | 1/4 BSP | 350 | 10 | 180 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 8 | 3/8 BSP | 350 | 10 | 180 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 10 | 1/4 BSP | 500 | 10 | 250 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 10 | 3/8 BSP | 500 | 10 | 250 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 10 | 1/2 BSP | 500 | 10 | 250 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 12 | 3/8 BSP | 700 | 10 | 350 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 12 | 1/2 BSP | 700 | 10 | 350 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 16 | 1/2 BSP | 1200 | 10 | 500 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
| 16 | 3/4 BSP | 1200 | 10 | 500 | ISO 6150 | Push-in pneumatic fitting for PA/PU tubing |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this pipe & pneumatic fitting in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. A non-standard pipe & pneumatic fitting is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
