A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) is specified for marine, coastal and chemical applications. When inch fully threaded rod, astm a193 b7 are specified in this grade, the dimensions remain per ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1; the material determines corrosion behavior (superior, including marine and chloride environments) 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 A4 Stainless Steel for Inch Fully Threaded Rod, ASTM A193 B7
Specified for marine, coastal and chemical applications. For inch fully threaded rod, astm a193 b7, 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 inch fully threaded rod, astm a193 b7: (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 Inch Fully Threaded Rod, ASTM A193 B7, the alternative stainless grade is A2 (304). A2 (304) covers general indoor and outdoor service. A4 (316) adds molybdenum, which is what buys the chloride resistance for marine and de-icing-salt exposure. Where strength matters more than corrosion, plated alloy steel in class 8.8 or 10.9 is the swap to make.
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 Inch Fully Threaded Rod, ASTM A193 B7 Available in A4 Stainless Steel
| Nominal size | Thread series | Standard lengths (ft) | Minimum tensile (ksi) | Minimum yield (ksi) | Elongation minimum (%) | Finish options | Reference standard |
|---|---|---|---|---|---|---|---|
| 1/4-20 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 3/8-16 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1/2-13 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 3/4-10 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1-8 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
| 1-1/4-7 | UNC / optional UNF or 8UN | 3 / 6 / 12 | 125 | 105 | 16 | plain / yellow-zinc / black-oxide / hot-dip-galvanized | ASTM A193 Grade B7; ASME B18.31.3 and ASME B1.1 |
