Stainless Steel Threaded Rod A2 A4 for Marine Applications
A2 / A4 Stainless Steel Threaded Rod — Marine Grade Fully Threaded Stud for Corrosion-Critical Service
SINOFASTENERstainless steel threaded rod (316L stud rod shipbuilding)products are manufactured from AISI 304 (A2) and AISI 316L (A4) stainless steel, offering a step-change in corrosion performance over carbon steel alternatives. As a A4 threaded rod marine, the A4-70/A4-80 variant delivers the chloride pitting resistance required for seawater ballast systems, engine room pipe hangers, and exposed deck structural tie rods — where conventional zinc-plated rods corrode within a single drydock cycle.
Ourfully threaded stud rod is available in DIN975 (M6–M20, 1m standard length) and DIN976 (M20–M64, 2m/3m length) configurations. Custom cut-to-length service allows procurement teams to order exact lengths for stainless steel stud bolt applications without site-side waste. All rods carry full EN 10204 3.1 material traceability with heat number, chemical composition, and mechanical test results.
| Application | Grade | Why Stainless |
|---|---|---|
| Engine Room Pipe Hanger / Support Rod | A4-70 | High humidity + oil mist; zinc coating fails within 6–12 months |
| Seawater Ballast Tank Tie Rod | A4-80 | Constant seawater immersion; PREN > 18 prevents chloride pitting |
| HVAC Duct Hanger Rod | A2-70 | Accommodation area exposed to condensation; no rust staining risk |
| Deck Equipment Anchor Stud | A4-70 | UV + saltwater splash zone; no coating maintenance required |
| Pump Base Mounting Stud | A4-80 | Vibration + chemical media; A4-80 provides higher preload retention |
| Chemical Tanker Cargo Pump Support | A4-80 / Duplex 2205 | Organic/inorganic chemical cargo; 316L or duplex depending on cargo type |
Material Grades & Mechanical Properties(marine grade threaded rod)
| Grade | Steel Grade | Tensile Strength | Yield Strength (Rp0.2) | PREN |
|---|---|---|---|---|
| A2-70 | AISI 304 / 1.4301 | ≥ 700 MPa | ≥ 450 MPa | ~18 |
| A4-70 | AISI 316 / 1.4401 | ≥ 700 MPa | ≥ 450 MPa | ~24 |
| A4-80 | AISI 316L / 1.4404 | ≥ 800 MPa | ≥ 640 MPa | ~24 |
| Duplex 2205 | 1.4462 | ≥ 620 MPa | ≥ 450 MPa | ~34 |
Product Specifications
| Parameter | Specification |
|---|---|
| Diameter Range | M6 – M64 (metric); custom imperial UNC/UNF on request |
| Standard Lengths | 1000mm (DIN975), 2000mm / 3000mm (DIN976) |
| Cut-to-Length | ±1mm tolerance; chamfered or plain cut ends |
| Thread Form | Metric coarse (standard), metric fine (special order), UNC/UNF (on request) |
| Product Standard | DIN975, DIN976, ASTM A193 M (stainless), ISO 888 |
| Surface Finish | Mill finish (as-drawn); electropolished / passivated per ASTM A967 on request |
| Certification | EN 10204 2.1 / 3.1 / 3.2 MTC available |
SINOFASTENER also supplies matching stainless steel hex nuts (A2-70 DIN934 / A4-80 ISO 4032) and stainless flat washers (DIN125/DIN9021) to complete the stainless steel fastener assembly for corrosion-critical marine applications. Full kitting service available for project procurement.
Contact SINOFASTENER for Quotation
📧 Email: sales@sinofastener.com
🌐 Website: www.sinofastener.com
📍 Ningbo Zhonglian Fastener Manufacture Co., Ltd. — SINOFASTENER
