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5KN Load Sky Corner Stringing Block for 90 Degree Angle Pole Pulls with 100mm-280mm Roller Diameter
Product Details:
| Place of Origin: | Ningbo, China |
| Brand Name: | Suntech |
| Certification: | ISO 9001 |
| Model Number: | SHCZ-0.5 / SHCZN-0.5 |
Payment & Shipping Terms:
| Minimum Order Quantity: | 1 PCS |
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| Price: | Negotiable |
| Packaging Details: | Plywood case with roller impact protection |
| Delivery Time: | 5-7 days |
| Payment Terms: | T/T,L/C |
| Supply Ability: | 5000 PCS per Month |
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Detail Information |
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| Product Type: | Sky Corner Stringing Block | Roller Diameter: | 100mm - 280mm |
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| Rated Load: | 5 KN | Unit Weight: | 1.8 KG Nylon / 2.4 KG Aluminium |
| Roller Material: | MC Nylon / Aluminium | Frame Material: | Galvanized Steel |
| Hanger Type: | Hook Ring Plate | Suitable Conductor: | LGJ 25 - LGJ 185 |
| Application: | Angle Poles, Obstacle Crossings, Urban Distribution | Warranty: | 1 Year |
| Highlight: | 5KN Load Sky Corner Stringing Block,90 Degree Angle Pole Corner Stringing Block,100mm-280mm Roller Angle Pole Stringing Block |
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Product Description
Sky Corner Stringing Block for Angle Poles and Obstacle Crossings
A corner block does not see the conductor tension, it sees roughly twice that multiplied by the half angle. At a 90 degree corner the resultant on the block is about 1.41 times the line tension, which is why a 5KN corner block belongs on distribution and small conductor work rather than on a transmission pull. This sky corner block is built for exactly that duty: SHCZ-0.5 with an aluminium roller and SHCZN-0.5 with a nylon roller, both for LGJ 25 to 185 conductor, 5KN rated, 1.8kg to 2.4kg, with a hook ring plate hanger that takes a standard crossarm or pole band.
Model Data
| Item No. | Model | Suitable Conductor (LGJ) | Rated Load (kN) | Weight (kg) | Roller |
| 10281 | SHCZ-0.5 | 25 - 185 | 5 | 2.4 | Aluminium |
| 10282 | SHCZN-0.5 | 25 - 185 | 5 | 1.8 | Nylon |
Roller diameters are supplied from 100mm to 280mm to suit the conductor and the corner angle; the 280mm units are used where the conductor has to keep a generous bend radius at a tight corner.
The Load at the Corner
Resultant on a corner block is 2T x cos(θ/2), where T is the conductor tension and θ is the angle between the two conductor legs. At 120 degrees included angle the block sees 1.0T, at 90 degrees it sees 1.41T, and at 60 degrees it sees 1.73T. Practically: with a 5KN block, keep the conductor tension at or below about 3.5KN when the corner is 90 degrees, and below 2.9KN when the corner closes to 60 degrees. If the pull needs more than that, use a larger block or set the corner with the conductor supported on two blocks.
Setting the Corner Block Correctly
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On the bisector: hang the block on the bisector line of the corner so the resultant passes through the hook ring rather than across it. A block hung off the bisector loads the hook in bending, which is the most common way a corner block fails in service.
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Clear of the pole and the crossarm edge: the roller groove has to sit outside any steel or concrete surface, or the conductor will rub on the structure instead of the roller once tension comes on.
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Pin the hook: the hook ring plate must be closed or pinned before the pull starts; an open hook can walk off a bolt when the conductor snaps into line.
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Control the angle during the pull: the block rotates as the conductor comes into line, so the crew has to watch the roller and re-seat it if the conductor rides against a side flange.
Choosing Roller and Roller Material
Roller diameter should be at least fifteen times the conductor diameter to stay inside the bend allowance, so LGJ 185 wants a 240mm to 280mm roller. Nylon is the better choice for aluminium and coated conductor because it does not mark the strands and there is no galvanic couple; aluminium holds its groove longer when the same corner is used repeatedly with steel rope or abrasive pulls, and it dissipates heat better on a long drag.
Urban Work and Obstacle Crossings
For street corners and span crossings the corner block keeps the conductor off road surfaces, walls and roof edges. Set the block high enough that the sagging conductor clears traffic and pedestrians through the whole drag, and use a second roller where the conductor changes plane, because a single roller cannot guide a conductor that turns in two directions at once.
Inspection and Service
Check the hook ring for wear and elongation, confirm the roller turns freely and shows no flat spot, and inspect the groove for burr from splice sleeves. Rollers and bearings are replaceable service parts, and the frame is galvanized steel with a painted finish option for coastal depots.
Packing and Supply
Blocks are packed in plywood cases, with the roller protected from impact. Monthly capacity is around 5000 pieces, delivery 5 to 7 days, minimum order 1 piece, and OEM marking or packing marks can follow the buyer's drawing.
Frequently Asked Questions
Can the block be used at a 45 degree corner? Yes, but the resultant rises to about 1.85T, so reduce the line tension accordingly or move to a higher rated block.
Is a three roller corner set available? Yes, a multi roller corner assembly is available for phase conductors that have to turn together.
Which model suits LGJ 120? SHCZN-0.5 with a 160mm to 200mm nylon roller covers it well.
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