DIN 3017 Steel Worm Drive Hose Clamp for Marine Piping
DIN 3017 Steel Worm Drive Hose Clamp for Marine Piping
DIN 3017 Steel Worm Drive Hose Clamp manufactured per DIN 3017-1:2021, designed for securing flexible hoses to pipe fittings in shipboard piping systems. Available in material grades W1 through W5, with W5 AISI 316 stainless steel specifically engineered for seawater and high-chloride marine environments. Band widths of 9 mm and 12 mm cover clamping diameters from 8 mm to 170 mm. The non-perforated smooth band with rolled edges prevents hose surface damage during tightening. All Worm Drive Hose Clamps are supplied with full material traceability and dimensional inspection reports. Products conform to DIN 3017 requirements and can accommodate third-party classification society inspection.
What Is a DIN 3017 Worm Drive Hose Clamp?
ADIN 3017 Worm Drive Hose Clamp is a mechanical fastening device that uses a captive worm gear screw to tension a stainless steel or carbon steel band around a hose outer diameter, creating a leak-proof seal between the hose and a barb, spigot, or flange stub. Per DIN 3017-1:2021, the standard defines two shapes:
- Shape A — Standard worm gear clamp with fixed band geometry, the most widely used type in marine piping.
- Shape B — Incorporates a temperature compensation spring element that automatically re-tensions the clamp when thermal cycling causes hose relaxation, suitable for engine room cooling circuits with large temperature swings.
The key design feature per DIN 3017 is the non-perforated (smooth) inner band surface with embossed thread teeth on the outer side. This eliminates sharp edges that could cut or extrude into soft rubber and silicone hoses — a critical requirement for marine fuel lines and cooling water connections where hose integrity directly affects vessel safety. Rolled band edges further protect the hose jacket from abrasion during vibration and pressure pulsation.
Material designations per DIN 3017 follow a W-grade system:
- W1 — Zinc-plated carbon steel (band, housing, and screw); for freshwater and dry interior installations.
- W2 — Mixed construction: stainless steel band and housing with zinc-plated screw; general marine use.
- W4 — Full AISI 304 stainless steel (band, housing, screw); humid environments, domestic water systems.
- W5 — Full AISI 316 stainless steel (band, housing, screw); maximum corrosion resistance for seawater, bilge, and offshore service.
Marine Applications
Note: The following applications are based on typical industry practice for DIN 3017 compliant worm drive clamps in marine environments. Specific material grade selection should consider the fluid medium, ambient temperature, and exposure duration.
| Location on Vessel | Hose Service | Recommended Grade |
|---|---|---|
| Engine Room — Main Cooling | Raw seawater intake and discharge hoses | W5 (AISI 316) |
| Engine Room — Auxiliary | Jacket water circulation hoses | W4 (AISI 304) / W5 |
| Bilge System | Bilge pump suction and discharge | W5 (AISI 316) |
| Fuel System | Fuel oil transfer and day tank lines | W4 / W5 |
| Ballast Water Treatment | BWTU connection tubing | W5 (AISI 316) |
| Fire Main | Flexible hose connections at hydrants | W4 / W5 |
| Domestic Water | Freshwater and hot water lines | W2 / W4 |
| HVAC / Ventilation | Flexible duct and air handling connections | W1 / W2 |
Specifications & Materials
| Parameter | Range | Standard Reference |
|---|---|---|
| Standard | DIN 3017-1:2021 | DIN 3017-1, Scope |
| Clamp Shapes | Shape A (standard) / Shape B (with temp. compensation spring) | DIN 3017-1, Clause 4 |
| Band Width | 9 mm / 12 mm | DIN 3017-1, Table 1 |
| Band Thickness | 0.75 mm (9 mm band) / 0.80 mm (12 mm band) | DIN 3017-1, Table 1 |
| Clamping Diameter Range | 8–12 mm to 150–170 mm (9 mm band); 16–27 mm to 200+ mm (12 mm band) | DIN 3017-1, Table 2 |
| Screw Head | 7 mm hexagonal (slotted + hex combo) | DIN 3017-1, Clause 5 |
| Material Grade W1 | Zinc-plated carbon steel (band + housing + screw) | DIN 3017-1, Table 3 |
| Material Grade W2 | SS band + housing, zinc-plated screw | DIN 3017-1, Table 3 |
| Material Grade W4 | AISI 304 stainless steel (all components) | DIN 3017-1, Table 3 |
| Material Grade W5 | AISI 316 stainless steel (all components) | DIN 3017-1, Table 3 |
| Installation Torque (9 mm band) | 3.0–4.0 Nm | DIN 3017-1, Table 4 |
| Installation Torque (12 mm band) | 4.0–5.0 Nm | DIN 3017-1, Table 4 |
| Breaking Torque (W5, 9 mm band) | ≥ 6.0 Nm | DIN 3017-1, Table 4 |
| Breaking Torque (W5, 12 mm band) | ≥ 7.0 Nm | DIN 3017-1, Table 4 |
| Salt Spray Resistance (W5) | ≥ 1000 h | ASTM B117 per industry practice |
| Band Design | Non-perforated, smooth inner surface, rolled edges | DIN 3017-1, Clause 5 |
Why Choose sinofastener for DIN 3017 Hose Clamps?
1. Full W-Grade Range in Stock
W1 through W5 material grades available in both 9 mm and 12 mm band widths. W5 AISI 316 clamps are ready to ship for urgent marine yard schedules.
2. Shape A and Shape B Supply
Standard Shape A clamps for general piping and Shape B clamps with temperature compensation spring for engine room circuits subject to thermal cycling.
3. Annual Capacity of 50,000 Tonnes
Our manufacturing facility produces 50,000 tonnes of fasteners annually, ensuring stable supply for large vessel outfitting programs and repeat orders.
4. Full Documentation Package
Material certificates (EN 10204 3.1), dimensional inspection reports per AQL sampling, and salt spray test records available with every shipment. Products can accommodate third-party classification society inspection upon request.
Standards Reference
| Standard | Title |
|---|---|
| DIN 3017-1:2021 | Hose clamps — Part 1: Clamps with worm gear drive, shapes A and B |
| ASTM B117 | Standard Practice for Operating Salt Spray (Fog) Apparatus |
| EN 10204 | Metallic products — Types of inspection documents |
| ISO 9227 | Corrosion tests in artificial atmospheres — Salt spray tests |
FAQ
Q1: What is the difference between DIN 3017 and SAE J1508 clamps?
A: DIN 3017 is the German standard specifying non-perforated (smooth) band worm drive clamps with shapes A and B. SAE J1508 is the American standard for perforated-band hose clamps. The DIN 3017 smooth band design protects soft hose surfaces from damage, while SAE J1508 perforated designs are lower cost but may mark or extrude into softer hose materials. For marine fuel and cooling lines, DIN 3017 type is generally preferred.
Q2: Which material grade should I use for seawater piping?
A: Per industry practice, W5 grade (full AISI 316 stainless steel) is recommended for all seawater-exposed applications including bilge systems, raw water cooling, and ballast water treatment. AISI 316 contains molybdenum (2–3%) which provides superior resistance to pitting and crevice corrosion in chloride environments compared to AISI 304 (W4 grade). For enclosed interior spaces with freshwater service, W2 or W4 may be sufficient.
Q3: What is the correct installation torque for a DIN 3017 clamp?
A: Per DIN 3017-1, the recommended installation torque depends on band width and material grade. For 9 mm band width: 3.0–4.0 Nm. For 12 mm band width: 4.0–5.0 Nm. The breaking torque for W5 grade is ≥ 6.0 Nm (9 mm band) and ≥ 7.0 Nm (12 mm band). Over-tightening beyond the recommended torque can damage the hose jacket or strip the worm gear threads.
Q4: Can you supply DIN 3017 clamps with classification society certificates?
A: Yes. Our products conform to DIN 3017-1 requirements and we can arrange third-party inspection by classification societies (DNV, ABS, LR, CCS, BV) upon request. Each shipment is supplied with material certificates per EN 10204 and dimensional inspection reports.
Contact Us
Email: sales@sinofastener.com | bobo@sinofastener.com
Tel: 0574-86592068
Website: www.zlfastener.com | www.sinofastener.com (Main)
