A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) is the most common stainless group for indoor and general outdoor fasteners. When jic 37-degree flare fittings are specified in this grade, the dimensions remain per SAE J514 / ISO 8434-2 (37-degree flared connections); the material determines corrosion behavior (good general corrosion resistance) and the service temperature range (approx. -200 °C to +400 °C, subject to the property class and the joint). Both are covered below with the size table.
Why Choose A2 Stainless Steel for JIC 37-Degree Flare Fittings
The most common stainless group for indoor and general outdoor fasteners. For jic 37-degree flare fittings, 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 jic 37-degree flare 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 JIC 37-Degree Flare Fittings, 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
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 JIC 37-Degree Flare Fittings Available in A2 Stainless Steel
| Dash size | Tube outside diameter | Thread (UNF) | Cone angle |
|---|---|---|---|
| -04 | 1/4 in | 7/16-20 | 37 degrees |
| -05 | 5/16 in | 1/2-20 | 37 degrees |
| -06 | 3/8 in | 9/16-18 | 37 degrees |
| -08 | 1/2 in | 3/4-16 | 37 degrees |
| -10 | 5/8 in | 7/8-14 | 37 degrees |
| -12 | 3/4 in | 1-1/16-12 | 37 degrees |
| -16 | 1 in | 1-5/16-12 | 37 degrees |
| -20 | 1-1/4 in | 1-5/8-12 | 37 degrees |
