English
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ArabicTo choose the right span clamp, match the messenger strand diameter, drop wire attachment, required load and corrosion protection. Then check the supplier’s drawing and installation instructions. The Q, E, C or O type name alone does not confirm that a fitting will suit your network.
This buying guide helps you compare span clamps for aerial drop installations before ordering for an FTTH, telephone or CATV project. It also gives distributors and contractors a practical checklist for requesting a quote.
What Is a Span Clamp Used For?
In the aerial drop systems covered here, a span clamp attaches to a messenger strand and provides a connection point for a drop wire clamp bail or a drop cable support wire. The messenger strand is the supporting wire that runs between poles.
The span clamp grips the messenger strand. A separate drop wire clamp holds the compatible drop cable. This distinction matters: you need to check the strand diameter for one fitting and the cable size for the other. Do not assume a strand-mounted fitting can clamp directly onto an ADSS cable jacket or serve as a power conductor clamp.
Q, E, C and O Span Clamp Comparison
Start with the connection your installation needs. Next, compare the exact model drawing with your existing hardware. Type names do not replace dimensions or tested load ratings.
| Model | Product design or use | What you should check |
|---|---|---|
| Q / CW-QSC | Mid-span drop take-off fitting; the listed strand range is 1/4–7/16 inch. | Strand diameter, jaw fit and drop attachment clearance. |
| E / CW-ESC | Strand attachment for accepting a drop wire clamp bail. | Bail fit, fastening details and approved strand range. |
| C / CW-CSC | Aluminum alloy clamping plates with a deep-bend hook and extended shank. | Hook opening, bail retention and plate dimensions. |
| O / CW-OSC | Strand attachment for a drop wire clamp bail or drop cable support wire. | Approved connection method, strand size and assembly drawing. |
Q Span Clamp: Check the Messenger Size First
The CW-QSC Q span clamp is designed for mid-span drop wire take-offs. Its listed 1/4–7/16 inch strand range equals about 6.35–11.11 mm. Confirm your strand measurement and the current drawing before placing an order.
E Span Clamp: Match the Drop Wire Clamp Bail
The CW-ESC E span clamp provides a strand attachment for a drop wire clamp bail. Check how the bail connects and whether there is enough space for assembly. Do not select it by span length alone.
C Span Clamp: Review the Hook and Plates
The CW-CSC C span clamp uses aluminum alloy clamping plates and a hook with a deep bend and extended shank. Review the hook geometry against your bail or wire grip loop. Also confirm the finish specified for the steel parts.
O Span Clamp: Confirm the Connection Method
The CW-OSC O span clamp provides a strand attachment for a drop wire clamp bail or a drop cable support wire. Ask for the installation drawing to confirm which connection method suits your assembly.
How to Choose the Right Span Clamp
1. Measure the Messenger Strand
Record the strand diameter and material. Then compare them with the model’s approved range. A fitting for the wrong size may not seat correctly, even if you can tighten its fastener. Keep the messenger size separate from the drop cable’s outer diameter in your purchase specification.
2. Check the Complete Connection
Compare the hook, bolt, jaw and bail dimensions. If you are replacing an existing fitting, send a drawing and clear photos of the assembly. For a new installation, check the span clamp and drop wire clamp together before approving a bulk order.
3. Confirm Load Ratings and Test Conditions
Ask your project engineer for the required working load and applicable specification. Request model-specific test information from the supplier. A breaking load is not a working load rating; compare values only when the test method and loading direction are clear.
4. Specify Materials and Surface Protection
State the required material and finish for each component. For example, the clamping plates and steel fasteners may use different materials. For coastal or humid sites, provide the exposure conditions and coating requirements instead of assuming that every galvanized assembly offers the same protection.
5. Review Installation and Inspection Requirements
Request the correct tightening instructions for the selected model. Do not apply one torque value across different designs. Before bulk supply, check sample fit, thread condition, surface finish and part dimensions against the approved drawing.
What to Include in Your Span Clamp RFQ
A clear request helps you compare quotations and avoid buying incompatible parts. Send the following details:
- Model: Q, E, C or O type, with a part number, drawing or sample photo.
- Messenger strand: diameter, material and construction details.
- Drop connection: bail dimensions or support wire details.
- Performance: required load, test method and project specification.
- Materials: component materials and required surface finish.
- Order details: quantity, destination, packaging and requested delivery date.
For repeat wholesale orders, agree on the sample, inspection criteria and labeling before production. This gives your purchasing and installation teams the same reference.
Source Span Clamps from Hbcrownwealth
Hebei Crown Wealth Metal Products Co., Ltd. is a manufacturer and wholesale supplier in China serving overseas distributors, importers and contractors. You can discuss standard Q, E, C and O models, drawing-based customization, and OEM / ODM requirements with our team.
Send your strand size, attachment drawing and order quantity to info@hbcrownwealth.com. Ask us to confirm the model, specifications, sample availability and lead time for your project.
Frequently Asked Questions
Is a span clamp the same as a drop wire clamp?
No. In these assemblies, the span clamp attaches to the messenger strand, while the drop wire clamp holds the drop cable. Check that both fittings connect correctly.
Which diameter should you check when choosing a span clamp?
Check the messenger strand diameter against the selected model’s range. Separately, check the drop cable dimensions against the drop wire clamp specification.
Can you use these span clamps directly on ADSS cable?
Do not assume so. These models are described as strand attachments. Direct ADSS support or anchoring needs hardware approved for the cable construction, diameter and load.
Are Q, E, C and O span clamps interchangeable?
Do not treat them as interchangeable based on their names. Compare strand range, connection geometry, materials and load requirements before substituting a model.
What should you send for a custom span clamp quote?
Send a dimensioned drawing or sample details, messenger size, load requirements, materials, finish and quantity. Include your packaging needs and destination so the supplier can prepare a relevant quotation.
