A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) is specified for marine, coastal and chemical applications. When inch left-hand fully threaded rod are specified in this grade, the dimensions remain per ASME B18.31.3 and ASME B1.1 LH; 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 Left-Hand Fully Threaded Rod
Specified for marine, coastal and chemical applications. For inch left-hand fully threaded rod, 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 left-hand fully threaded rod: (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 Left-Hand Fully Threaded Rod, 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 Inch Left-Hand Fully Threaded Rod Available in A4 Stainless Steel
| Nominal size | Thread hand | Thread class | Standard lengths (in/ft) | Material options | Reference standard |
|---|---|---|---|---|---|
| 6-32 | left-hand | 2A | 12 / 24 in and 3 ft | zinc-plated steel / 18-8 stainless / 316 stainless | ASME B18.31.3 and ASME B1.1 LH |
| 8-32 | left-hand | 2A | 12 / 24 in and 3 ft | zinc-plated steel / 18-8 stainless / 316 stainless | ASME B18.31.3 and ASME B1.1 LH |
| 10-24 | left-hand | 2A | 12 / 24 in and 3 ft | zinc-plated steel / 18-8 stainless / 316 stainless | ASME B18.31.3 and ASME B1.1 LH |
| 1/4-20 | left-hand | 2A | 12 / 24 in and 3 ft | zinc-plated steel / 18-8 stainless / 316 stainless | ASME B18.31.3 and ASME B1.1 LH |
| 3/8-16 | left-hand | 2A | 12 / 24 in and 3 ft | zinc-plated steel / 18-8 stainless / 316 stainless | ASME B18.31.3 and ASME B1.1 LH |
| 1/2-13 | left-hand | 2A | 12 / 24 in and 3 ft | zinc-plated steel / 18-8 stainless / 316 stainless | ASME B18.31.3 and ASME B1.1 LH |
