508mm 20–60kN MC Nylon Sheave Stringing Blocks
Product Overview
508mm MC nylon sheave large diameter stringing blocks are engineered for overhead transmission line construction and conductor pulling applications. Featuring 508mm large diameter sheaves, 20-60kN rated load capacity, and 1/3/5 sheave configurations, these cable pulling blocks provide stable conductor support while minimizing bending stress and cable surface wear.
The MC nylon sheave design offers superior conductor protection during stringing operations, particularly for medium-size conductors such as ACSR400 in power line installation projects.
Common Challenges in Transmission Line Construction
- High friction during conductor pulling operations
- Conductor surface damage during long-distance stringing
- Unstable pulling operation for bundled conductors
- Increased labor costs due to inefficient cable guiding
- Difficulty selecting appropriate pulley blocks for different conductor arrangements
Engineering Solutions
508mm Large Diameter Design → Reduces conductor bending stress
MC Nylon Sheave → Minimizes cable wear and protects conductor surface
1/3/5 Sheave Options → Suitable for single, twin and bundled conductor stringing
20-60kN Rated Load → Supports medium-duty transmission line construction
Customizable Structure → Adapts to diverse power construction requirements
Technical Specifications
| Parameter |
Value |
Engineering Significance |
| Sheave Diameter |
508mm |
Reduces conductor bending stress |
| Sheave Dimension |
Φ508*Φ408*75mm |
Suitable for medium-size conductor stringing |
| Rated Load |
20 / 40 / 60kN |
Covers single and multi-sheave pulling work |
| Number of Sheaves |
1 / 3 / 5 |
Supports single, twin or bundled conductor installation |
| Sheave Material |
MC Nylon |
Reduces cable wear and friction |
| Applicable Conductor |
ACSR400 |
Suitable for medium transmission line conductors |
| Conductor Diameter |
17-25mm |
Common range for overhead line construction |
| Application |
Transmission Line / Cable Pulling |
Used for power construction projects |
Model Selection Guide
| Model |
Sheaves |
Rated Load |
Weight |
Sheave Material |
Recommended Use |
| SHDN508 |
1 |
20kN |
16kg |
MC Nylon |
Single conductor stringing |
| SHSQN508 |
3 |
40kN |
38kg |
MC Nylon |
Twin / multi-conductor stringing |
| SHWQN508 |
5 |
60kN |
70kg |
MC Nylon |
Bundled conductor construction |
Operation Principle
The stringing block guides conductors through rotating MC nylon sheaves during pulling operations. The 508mm large diameter sheave significantly reduces bending stress, while the nylon material minimizes friction and provides superior conductor surface protection.
For single conductor construction, a 1-sheave block is typically employed. For bundled conductor or multi-conductor applications, 3-sheave or 5-sheave stringing blocks deliver enhanced load distribution and pulling stability.
Applications
- Transmission line construction
- Overhead conductor stringing
- Power line installation
- ACSR conductor pulling
- High-voltage line construction
- Utility power construction projects
- Cable pulling and guiding operations
Selection Guidelines
- Choose 1 sheave for single conductor stringing projects
- Choose 3 sheaves for enhanced stability in twin or multi-conductor applications
- Choose 5 sheaves for superior load distribution in bundled conductor construction
- Select MC nylon sheaves when conductor protection and reduced cable wear are priorities
- Opt for 508mm diameter when working with medium-size conductors such as ACSR400
Key Advantages
508mm Large Diameter Design – Significantly reduces conductor bending stress during long-distance pulling operations
MC Nylon Sheave Protection – Minimizes friction and cable wear compared to hard metal contact surfaces
1/3/5 Sheave Configuration – Versatile solutions for single conductor, twin conductor and bundled conductor installation
20-60kN Rated Load – Meets standard medium-duty transmission line construction requirements
Customizable Design – Sheave material, frame type and configuration can be tailored to specific project requirements
Frequently Asked Questions
Q1: What conductor is this 508mm stringing block suitable for?
A: It is commonly used for medium-size conductors such as ACSR400, with conductor diameter typically ranging from 17-25mm.
Q2: Why choose MC nylon sheave?
A: MC nylon sheaves significantly reduce friction and protect conductor surfaces during stringing operations, extending conductor lifespan.
Q3: What is the difference between 1, 3 and 5 sheaves?
A: 1 sheave is designed for single conductor applications, while 3 and 5 sheaves are engineered for multi-conductor or bundled conductor stringing operations.
Q4: Can the sheave width be customized?
A: Yes. While standard sheave size is Φ508*Φ408*75mm, wider sheave options can be customized according to specific project requirements.
Q5: Is this product suitable for power construction projects?
A: Yes. It is specifically designed for transmission line construction, overhead conductor stringing and cable pulling applications in power infrastructure projects.
Additional Product Series
Model 660 Series (Maximum suitable conductor: LGJ500)
Note: Standard wheel width 100mm, other dimensions customizable per customer requirements.
| Model |
No. of Wheel |
Rated Load (KN) |
Weight (kg) |
Outside Diameter (mm) |
Root Diameter (mm) |
Features |
| SHD660 | 1 | 30 | 40 | 660 | 560 | MC nylon sheave |
| SHS660 | 3 | 40 | 70 | 660 | 560 | |
| SHW660 | 5 | 70 | 103 | 660 | 560 | |
| SHW66ON | 5 | 70 | 140 | 660 | 560 | Middle: cast steel sheave |
| SHQ660 | 7 | 100 | 165 | 660 | 560 | MC nylon sheave, middle sheave width 110mm |
| SHQ660N | 7 | 100 | 203 | 660 | 560 | Middle: cast steel sheave |
Model 822 Series (Maximum suitable conductor: LGJ630)
Note: Standard wheel width 110mm, other dimensions customizable per customer requirements.
| Model |
No. of Wheel |
Rated Load (KN) |
Weight (kg) |
Outside Diameter (mm) |
Root Diameter (mm) |
Features |
| SHD822 | 1 | 40 | 60 | 822 | 710 | MC nylon sheave |
| SHS822 | 3 | 80 | 120 | 822 | 710 | |
| SHW822 | 5 | 100 | 190 | 822 | 710 | |
| SHQ822 | 7 | 150 | 236 | 822 | 710 | |
| SHW822N | 5 | 100 | 240 | 822 | 710 | Middle: cast steel sheave |
| SHQ822N | 7 | 150 | 272 | 822 | 710 | |
| SHJ822 | 9 | 200 | 420 | 822 | 710 | |
Model 916 Series (Maximum suitable conductor: LGJ800)
Note: Standard wheel width 110mm, other dimensions customizable per customer requirements.
| Model |
No. of Wheel |
Rated Load (KN) |
Weight (kg) |
Outside Diameter (mm) |
Root Diameter (mm) |
Features |
| SHD916 | 1 | 50 | 70 | 916 | 800 | MC nylon sheave |
| SHS916 | 3 | 80 | 132 | 916 | 800 | |
| SHW916 | 5 | 120 | 198 | 916 | 800 | |
| SHQ916 | 7 | 180 | 270 | 916 | 800 | |
| SHW916N | 5 | 120 | 260 | 916 | 800 | Middle: cast steel sheave |
| SHQ822N | 7 | 180 | 321 | 916 | 800 | |
Model 1040 Series (Maximum suitable conductor: LGJ1000)
Note: Standard wheel width 125mm, other dimensions customizable per customer requirements.
| Model |
No. of Wheel |
Rated Load (KN) |
Weight (kg) |
Outside Diameter (mm) |
Root Diameter (mm) |
Features |
| SHD1040 | 1 | 60 | 85 | 1040 | 900 | MC nylon sheave |
| SHS1040 | 3 | 120 | 190 | 1040 | 900 | |
| SHW1040 | 5 | 150 | 340 | 1040 | 900 | |
| SHQ1040 | 7 | 200 | 390 | 1040 | 900 | |
| SHJ1040 | 9 | 300 | 789 | 1040 | 900 | |
| SHE1040 | 11 | 300 | 970 | 1040 | 900 | |
| SHW1040N | 5 | 150 | 395 | 1040 | 900 | Middle: cast steel sheave |
| SHQ1040N | 7 | 200 | 463 | 1040 | 900 | |
Model 1160 Series (Maximum suitable conductor: LGJ1250)
Note: Standard wheel width 150mm, other dimensions customizable per customer requirements.
| Model |
No. of Wheel |
Rated Load (KN) |
Weight (kg) |
Outside Diameter (mm) |
Root Diameter (mm) |
Features |
| SHD1160 | 1 | 50 | 112 | 1160 | 1000 | MC nylon sheave |
| SHS1160 | 3 | 120 | 245 | 1160 | 1000 | |
| SHS1160N | 3 | 120 | 355 | 1160 | 1000 | Middle: cast steel sheave |
Product Images
