Rubber Lined U-Bolt Pipe Clamp
Rubber Lined U-Bolt Pipe Clamp | DIN 3570 Marine | sinofastener
Arubber lined U-bolt pipe clamp is a U-bolt (per DIN 3570) with an EPDM rubber lining bonded to the inner surface of each leg, providing vibration isolation and corrosion protection between the clamp and the pipe wall. sinofastener manufactures rubber lined U-bolt pipe clamps in carbon steel (Class 4.8 / 8.8 per ISO 898-1) and stainless steel (A2-70 / A4-70 per ISO 3506-1), covering pipe sizes DN 20 to DN 500. Products are supplied with hex nuts (ISO 4032), flat washers (ISO 7089), and optionally a base plate. Third-party inspection available per client requirements.
What Is a Rubber Lined U-Bolt Pipe Clamp?
Arubber lined U-bolt pipe clamp consists of four main components:
- U-bolt — cold-formed round steel bent into a U shape with threaded legs, sized per DIN 3570
- EPDM rubber lining — extruded rubber profile (Shore A 50 ± 5, per DIN 4109 acoustic guidelines) bonded to the inner arc and legs of the U-bolt
- Hex nuts + flat washers — for securing the clamp to the base plate or supporting structure
- Base plate — flat steel plate (optional) for mounting to walls, ceilings, or structural members
The EPDM rubber lining in a rubber lined U-bolt pipe clamp serves three functions: vibration damping (reducing structure-borne noise per DIN 4109 guidelines), galvanic isolation (preventing contact corrosion between dissimilar metals), and pipe surface protection (preventing scratches on coated pipes such as 3LPE or epoxy-coated piping).
Marine Applications
On board ships and offshore installations, rubber lined U-bolt pipe clamps are used wherever piping runs require secure fixing with vibration isolation.
| Location | Pipe System | Function |
|---|---|---|
| Engine room | Fuel oil, lube oil, cooling water | Reduce vibration transmission to hull structure |
| Ballast pump room | Ballast water piping | Isolate pump-induced vibration from pipe supports |
| Accommodation area | HVAC, fresh water, fire main | Minimize structure-borne noise in crew cabins |
| Deck piping | Cargo lines, vent lines | Absorb thermal expansion movement and reduce fretting |
| Bilge system | Bilge water piping | Prevent galvanic corrosion between clamp and pipe |
Sources: DIN 3570 (U-bolt dimensions); DIN 4109 (acoustic insulation in buildings, applied to marine piping support).
Specifications and Materials
Standard References for Rubber Lined U-Bolt Pipe Clamp:
- DIN 3570 — U-bolt dimensions (inside width, thread size, height, thread length)
- DIN 4109 — Acoustic insulation guidelines; industry reference for rubber-lined pipe clamp noise reduction
- ISO 898-1 — Mechanical properties of carbon steel fasteners (Class 4.8, 8.8)
- ISO 3506-1 — Mechanical properties of stainless steel fasteners (A2-70, A4-70)
- ISO 965-2 — Metric thread tolerances (6g bolt, 6H nut)
- ISO 4032 — Hex nut dimensions (Style 1)
- ISO 7089 / ISO 7090 — Flat washer dimensions (plain / spring type)
- ASTM F2329 / ISO 1461 — Hot-dip galvanized coating requirements
- ISO 4042 — Electro-zinc plating requirements
Material Options:
| Property | Carbon Steel (4.8) | Carbon Steel (8.8) | SS A2-70 (304) | SS A4-70 (316L) |
|---|---|---|---|---|
| Tensile strength (min) | 400 MPa | 800 MPa | 700 MPa | 700 MPa |
| Yield strength (min) | 200 MPa | 640 MPa | 450 MPa | 450 MPa |
| Hardness range | — | — | 150–250 HV | 150–250 HV |
| Source | ISO 898-1 Table 1 | ISO 898-1 Table 1 | ISO 3506-1 Table 1 | ISO 3506-1 Table 1 |
EPDM Rubber Lining Specification:
| Property | Value | Source |
|---|---|---|
| Material | EPDM (Ethylene Propylene Diene Monomer) | Industry standard |
| Hardness | Shore A 50 ± 5 | Per DIN 4109 guidelines |
| Temperature range | -50 °C to +110 °C | EPDM material data |
| Lining thickness | 2–3 mm | Per clamp size |
| Color | Black / White | Per customer requirement |
DIN 3570 Dimensions — Rubber Lined U-Bolt Pipe Clamp:
| DN | Pipe OD (mm) | Inside Width W (mm) | Thread | Thread Length LT(mm) | Height H (mm) |
|---|---|---|---|---|---|
| 20 | 26.9 | 30 | M8 | 40 | 45 |
| 25 | 33.7 | 37 | M8 | 40 | 50 |
| 32 | 42.4 | 46 | M10 | 50 | 55 |
| 40 | 48.3 | 52 | M10 | 50 | 60 |
| 50 | 60.3 | 64 | M10 | 50 | 70 |
| 65 | 76.1 | 80 | M12 | 60 | 80 |
| 80 | 88.9 | 93 | M12 | 60 | 90 |
| 100 | 114.3 | 118 | M12 | 60 | 105 |
| 125 | 139.7 | 144 | M16 | 80 | 120 |
| 150 | 168.3 | 173 | M16 | 80 | 135 |
| 200 | 219.1 | 224 | M16 | 80 | 160 |
| 250 | 273.0 | 278 | M20 | 100 | 190 |
| 300 | 323.9 | 329 | M20 | 100 | 215 |
| 350 | 355.6 | 361 | M20 | 100 | 230 |
| 400 | 406.4 | 412 | M20 | 100 | 260 |
| 500 | 508.0 | 514 | M24 | 120 | 310 |
Note: H values are approximate and may vary by manufacturer. Thread length LT per DIN 3570 Table 1. Rubber lining adds approximately 4–6 mm to inside width.
Surface Treatment Options:
| Treatment | Coating Thickness | Source |
|---|---|---|
| Hot-dip galvanized (HDG) | ≥ 45 µm (local) / ≥ 55 µm (average) | ASTM F2329 / ISO 1461 |
| Electro zinc plated | ≥ 5 µm | ISO 4042 |
| Plain (uncoated) | — | As formed |
Assembly Components:
| Component | Standard | Notes |
|---|---|---|
| U-bolt with EPDM lining | DIN 3570 + DIN 4109 | Core component |
| Hex nuts (×2) | ISO 4032, Grade A | Matching thread and property class |
| Flat washers (×2) | ISO 7089, plain type | Distributes clamping force |
| Base plate (optional) | Per project drawing | Carbon steel, HDG |
Why Choose sinofastener for Rubber Lined U-Bolt Pipe Clamp?
sinofastener has been supplying fasteners for marine piping systems for decades. Our rubber lined U-bolt pipe clamps are manufactured under strict quality control:
- Material traceability — Mill certificates per EN 10204 2.1/3.1
- Dimensional inspection — Every batch checked against DIN 3570 tolerances
- Third-party inspection — BV, DNV, SGS, LR, ABS — at client's cost
- Custom rubber lining — EPDM thickness and hardness adjusted per project requirements
- Complete supply — U-bolt + nuts + washers + base plate as one assembly package
- Annual capacity — 50,000 tons of fastener production
Standards Reference
| Standard | Scope |
|---|---|
| DIN 3570 | U-bolt dimensions — inside width, thread, height |
| DIN 4109 | Acoustic insulation — rubber lining noise reduction guidelines |
| ISO 898-1 | Carbon steel fastener mechanical properties |
| ISO 3506-1 | Stainless steel fastener mechanical properties |
| ISO 965-2 | Metric thread tolerance (6g / 6H) |
| ISO 4032 | Hex nut Style 1 dimensions |
| ISO 7089 / 7090 | Flat washer / spring washer dimensions |
| ASTM F2329 / ISO 1461 | Hot-dip galvanized coating |
| ISO 4042 | Electro zinc plating |
FAQ
Q1: What is the difference between a rubber lined U-bolt pipe clamp and a standard U-bolt clamp?
A standard U-bolt clamp has bare steel contacting the pipe directly. A rubber lined U-bolt pipe clamp has an EPDM rubber profile bonded to the inner arc and legs, providing vibration damping, noise reduction (per DIN 4109), and corrosion isolation.
Q2: Can rubber lined U-bolt pipe clamps be used in saltwater environments?
For saltwater or high-chloride environments, we recommend A4-70 (316L) stainless steel U-bolts with EPDM lining. Carbon steel U-bolts with HDG coating are suitable for general marine service but have limited life in direct saltwater contact.
Q3: What sizes of rubber lined U-bolt pipe clamp do you supply?
We supply DN 20 to DN 500 per DIN 3570, covering pipe OD from 26.9 mm to 508.0 mm. Custom sizes available per project drawing.
Q4: Do you supply the complete clamp assembly?
Yes. Each rubber lined U-bolt pipe clamp is supplied with matching hex nuts (ISO 4032), flat washers (ISO 7089), and optionally a base plate. The complete assembly is ready for installation.
Need rubber lined U-bolt pipe clamps for your marine project?
Email: sales@sinofastener.com | bobo@sinofastener.com
Tel: 0574-86592068
Website: www.zlfastener.com | www.sinofastener.com (Main)
