316-A4 Stainless Steel Threaded Rods

What Is 316-A4 Stainless Steel Threaded Rod?

316-A4 stainless steel threaded rod is manufactured from AISI 316 / EN 1.4401 or 1.4404 stainless steel, alloyed with 2.0–2.5% molybdenum, significantly improving resistance to pitting and crevice corrosion compared with 304 / A2 fasteners.Under ISO 3506, A4 fasteners are classified as marine-grade stainless steel, suitable for aggressive service conditions such as coastal, offshore, chemical, and industrial atmospheres.

 

Are you looking for high-strength, corrosion-resistant threaded rods for marine, chemical, or outdoor structural applications?316-A4 stainless steel threaded rods are engineered for demanding environments where standard carbon steel or A2 fasteners fail. With excellent resistance to chlorides, salt spray, acids, and high humidity, A4-70 / A4-80 threaded rods are widely recognized as the preferred fastening solution for long-term, safety-critical installations.

As a professional stainless steel supplier, GNEE provides full-specification 316 (A4) stainless steel threaded rods with stable quality, competitive pricing, and global export experience to support your projects efficiently.

Key Advantages of 316-A4 Stainless Steel Threaded Rods

✔ Superior corrosion resistance in chloride-rich and acidic environments
✔ Long service life, reducing maintenance and replacement costs
✔ Non-magnetic (annealed condition)
✔ Excellent performance at low and moderate temperatures
✔ Fully recyclable & environmentally friendly material

Compared with galvanized rods, 316-A4 stainless steel threaded rods can last 5–10 times longer in outdoor or marine environments.

 

Available Specifications of 316-A4 Threaded Rods

Item	Range
Standard	DIN 976, ISO 898-1, ASTM A193
Diameter	M4 – M42 (1/4" – 1-1/2")
Length	1000 mm / 2000 mm / Custom
Thread Type	Metric / UNC / UNF
Surface Finish	Bright, Pickled, Passivated
Certification	ISO, SGS, BV, Mill Test Certificate

 

Chemical Composition of 316-A4 Stainless Steel

Element	Typical Content (%)
Carbon (C)	≤ 0.08
Chromium (Cr)	16.0 – 18.5
Nickel (Ni)	10.0 – 14.0
Molybdenum (Mo)	2.0 – 2.5
Manganese (Mn)	≤ 2.0
Silicon (Si)	≤ 1.0
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.030

 

Mechanical Properties (ISO 3506)

Property	A4-70	A4-80
Tensile Strength (MPa)	≥ 700	≥ 800
Yield Strength (MPa)	≥ 450	≥ 600
Elongation (%)	≥ 0.4d	≥ 0.4d
Hardness (HV)	≤ 215	≤ 250

d = nominal diameter

 

Applications of 316-A4 Stainless Steel Threaded Rods

316-A4 threaded rods are widely used in industries where corrosion resistance and structural reliability are critical:

Marine & offshore platforms

Chemical processing plants

Desalination and water treatment systems

Food & beverage processing equipment

Coastal buildings and bridges

Renewable energy (solar & wind mounting systems)

 

GNEE supplies 316-A4 threaded rods made from international standard ASTM A193/A320 or EN 1.4401/1.4404 raw materials. The chemical composition ensures Cr ≥ 16.5%, Ni 10–14%, and Mo 2–3%, exhibiting excellent corrosion resistance with no red rust after ≥480 hours in salt spray corrosion testing (according to ISO 9227/ASTM B117). Mechanical properties meet or exceed A4-70 grade requirements (yield strength ≥700 MPa, tensile strength ≥800 MPa), and are certified by an ISO 9001 quality system and SGS/BV third-party testing reports. Certificates are available upon request.

 

Packaging utilizes moisture-proof and vibration-resistant reinforcement measures (such as plastic sleeves, bubble wrap, and wooden crates/pallets) and is transported by reliable logistics partners to ensure no damage during land or sea transport.

FAQ

1. What is the difference between A2 and A4 stainless steel threaded rods?
A4 (316) contains molybdenum, offering much better corrosion resistance than A2 (304), especially in marine and chemical environments.

2. Are 316-A4 threaded rods suitable for outdoor use?
Yes. A4 stainless steel is ideal for long-term outdoor and coastal applications without rusting.

3. What strength grades are available for A4 threaded rods?
Common grades include A4-70 and A4-80 under ISO 3506.

4. Can 316-A4 threaded rods be used in marine environments?
Absolutely. A4 stainless steel is considered marine-grade and widely used offshore.

5. How long do 316 stainless steel threaded rods last?
In most corrosive environments, service life can exceed 20–30 years with minimal maintenance.