YOKELINK straight line strain clamp

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Product details

Straight Line Strain Clamp | Custom LPDC Casting | High-Strength Cast Aluminum | High Precision Machined

The Yokelink Straight Line Strain Clamp is designed to deadend bare ACSR, AAC, and AAAC conductors, as well as galvanized steel guy wires. The main body and keeper are precision-cast to provide a high-tension grip without damaging the conductor strands.

Waved Groove Design & High Clamping Force:

The cast keeper and clamp body feature a specifically engineered waved/contoured groove. When the heavy-duty U-bolts are torqued down, the keeper compresses the conductor into these grooves, creating massive frictional holding power (slip strength) that often exceeds 90% of the conductor's ultimate breaking strength.

Supplied with high-tensile steel U-bolts, nuts, and lock washers. Ductile iron versions are fully Hot Dip Galvanized to ASTM A153, while cast aluminum versions provide natural corrosion resistance with galvanized steel hardware.

Our Low-Precision Casting Process

The integrity of a strain clamp is entirely dependent on its casting quality. At Yokelink, we utilize advanced metallurgical processes to eliminate internal defects and guarantee maximum gripping strength.

1. High-Purity Alloy Melting (High-Purity Alloy Melting): We start with premium-grade Aluminum Alloy (for conductors) or Ductile Iron (for ground wires). The alloys are refined in controlled furnaces to eliminate impurities that could weaken the final structure.

2. Dense Gravity & Low Pressure Casting: Our casting molds are engineered to optimize metal flow and cooling rates. This prevents the formation of internal porosity, shrinkage cavities, or sand inclusions, ensuring the clamp body is solid and structurally uniform.

3. Thermal Treatment & Hardening: After casting, the components undergo a precise heat treatment cycle (T6 for aluminum). This crucial step aligns the internal grain structure, significantly boosting the yield strength and preventing brittle fractures under sudden ice or wind loads.

4. Non-Destructive Testing (NDT): We don't guess on safety. Batches are subjected to X-ray or magnetic particle inspections to verify that the internal casting structure is 100% sound before the clamps are tapped, galvanized, and shipped.

Production Process of Straight Line Strain Clamp

High-quality carbon steel and malleable iron are selected as raw materials and cut into standard blanks, then formed by hot forging or stamping into the main clamp body, pressing plate and fastening parts. After trimming flash, removing burrs and precision machining, internal and external threads are processed for matching assembly. Components undergo heat treatment to improve mechanical strength, toughness and compression resistance. The whole parts are treated with hot-dip galvanizing to achieve outstanding anti-corrosion performance for outdoor use. Finally, strict inspections on dimension, compression performance, surface coating and appearance are conducted, and qualified products are assembled and packaged for delivery.

Application of Straight Line Strain Clamp

Straight line strain clamps are critical power fittings widely used in overhead transmission and distribution lines. They are designed to firmly connect and fix aluminum conductors and steel-cored aluminum strands in straight line sections, maintaining stable wire tension and preventing loosening or disconnection. With reliable clamping performance and uniform force distribution, they ensure safe and continuous power transmission. Manufactured with high-strength materials and hot-dip galvanized treatment, they offer great anti-corrosion ability and long service life. They are commonly applied in power grid construction, line renovation and outdoor electrical engineering.

Yokelink Product Quality Inspection Report

We provide comprehensive inspection services for machine bolts, including SGS test bolts and formal Production Part Inspect Report (PPIR). The SGS tests verify the bolts’ compliance with international standards like ASTM A307 and IEEE C135.80, covering mechanical properties and corrosion resistance. The PPIR details all inspection items, ensuring each machine bolt meets dimensional, performance and quality requirements, providing reliable quality assurance for overhead line and industrial applications.

Technical Specifications of Straight Line Strain Clamp

Part No.	Conductor		A	B	C	U Bolt	Weight
Part No.	Min	Max	mm	mm	mm	mm	Kg / Pcs
F1148N	#6	3/0	245	16	16	M10	0.645
F1188N	#2	556.5	250	16	19	M12	0.750

Cross Reference (Industry Equivalents):

Conductor		Part No.	HUBBELL	MACLEAN	GPP
Min	Max	Part No.	HUBBELL	MACLEAN	GPP
#6	3/0	F1148N	ADS48N		SAC-48-N
#2	556.5	F1188N	ADS88N		SAC-88-N

(Note: Manufacturer part numbers are for reference only. Yokelink products are interchangeable based on IEEE C135.90 standards.)

Do you know what is the Low-Pressure Casting Process?

Low-pressure casting is a casting process in which low-pressure gas is introduced into a closed, insulated furnace, and molten metal is slowly and steadily filled into the mold cavity from bottom to top through a riser pipe. The metal then solidifies under pressure. It is most commonly used for aluminum alloys. It features smooth filling, fewer gas inclusions and slag inclusions, dense castings with good mechanical properties, excellent dimensional accuracy and surface quality, and high metal utilization. It is suitable for producing complex castings such as automobile wheel hubs and cylinder heads that require high strength and high sealing. The disadvantages are that the production cycle is slower than high-pressure die casting and the investment cost in equipment and molds is higher.

What are the main types of casting processes?

Based on the mold materials and pouring methods, the industry classifies casting into four main schools:

1. Sand Casting

Process Characteristics: The oldest and most commonly used process. A mold is made using specially prepared molding sand (sand mixed with binder), and metal is poured into it. The sand mold is destroyed after the casting is removed (disposable mold).

Suitable Scenarios: Low cost, suitable for making large, heavy parts ranging from a few kilograms to tens of tons. The surface will be relatively rough.

Typical Applications: Foundation bases for heavy iron towers, large valve housings.

2. Die Casting

Process Characteristics: Molten liquid metal is rapidly poured into a precision metal mold under high pressure and then cooled under pressure.

Suitable Scenarios: Extremely high production efficiency, extremely smooth surface, and high dimensional accuracy. Typically used for non-ferrous metals with low melting points, such as aluminum alloys and zinc alloys.

Typical Applications: Automotive engine housings, communication base station radiators.

3. Precision Casting / Investment Casting / Lost Wax

Process Characteristics: Also known as the traditional "lost-wax casting" method. A wax model is first made, then coated with refractory slurry. Heating melts the wax, creating a cavity, which is then filled with metal.

Suitable Scenarios: Extremely high precision, capable of producing very complex parts that do not require further finishing. Commonly used for stainless steel and alloy steel.

Typical Applications: Aero-engine blades, precision mechanical gears, high-end marine rigging.

4. Gravity Die Casting

Process Characteristics: The mold is made of heat-resistant alloy steel, and molten metal flows into the mold solely by gravity. The mold can be reused thousands of times.

Suitable Scenarios: Combines the advantages of sand casting and die casting, resulting in a dense internal structure and good mechanical properties in the casting.

Typical applications: The vast majority of high-strength aluminum alloy electrical fittings (such as bolt-type tension clamps and suspension clamp bodies) are made using this process.

Product Classification by Casting Process (by Material)

Grey Cast Iron: Inexpensive, good shock absorption, but relatively brittle.

Ductile Cast Iron: Contains spheroidizing agents, significantly improving strength and toughness, even comparable to carbon steel. In electrical fittings, load-bearing tension clamps and ball joint arms are almost entirely made of ductile iron.

Cast Steel: Designed for applications requiring extremely high tensile strength and impact resistance, such as hooks for heavy-duty cranes.

Cast Aluminum Alloy: Lightweight, highly conductive, and non-magnetic (does not generate hysteresis loss or heat). Specifically used for clamping overhead bare conductors (ACSR).

Cast Bronze/Brass: Extremely corrosion-resistant and has excellent electrical conductivity. The silicon bronze acorn clamp in a lightning protection grounding system is a classic example.

Product Classification by Casting Process

Applications of Low-Pressure Casting Technology

Primarily made of aluminum alloys, but also usable with magnesium alloys, copper alloys, cast iron, etc., focusing on castings requiring density, pressure resistance, high strength, and low porosity:

Automotive Industry: Car wheels, engine cylinder heads, cylinder blocks, intake manifolds, suspension brackets, chassis structural components, battery housings, gearbox housings;

New Energy Industry: New energy vehicle motor housings, electronic control housings, battery load-bearing structural components;

General Machinery Hardware: Pump bodies, valve bodies, pipeline fittings, agricultural machinery parts, engineering machinery structural components;

Aerospace & Military Industry: Small and medium-sized precision structural components, instrument housings, lightweight airborne parts;

Home Appliances & Communications: Large home appliance aluminum alloy structural frames, precision housings for communication equipment;

Others: Motorcycle wheels, lightweight aluminum castings for rail transit, precision aluminum castings for handicrafts.

Core Applications: Complex aluminum parts requiring airtightness, load-bearing capacity, and tensile strength, and unsuitable for porosity or shrinkage.

Frequently Asked Questions (FAQ)

Q1: Why is casting quality so critical for a Straight Line Strain Clamp?

A: The clamp is the single point of failure at a deadend pole. If the casting process leaves internal porosity (air pockets) or sand inclusions inside the metal, the body will have hidden weak points. Under the dynamic tension of wind or ice loads, these defects can cause a catastrophic brittle fracture. Yokelink's strict casting and NDT inspection processes guarantee a solid, flawless internal structure.

Q2: Should I choose a Cast Aluminum or Ductile Iron strain clamp?

A: It depends on the cable you are securing. For bare aluminum conductors (ACSR, AAC), you must use Cast Aluminum Alloy clamps to avoid galvanic corrosion and magnetic heating losses (hysteresis). For securing galvanized steel guy wires or static ground wires, Ductile Iron clamps (Hot Dip Galvanized) are preferred for their sheer mechanical strength.

Q3: How do you prevent internal defects like porosity in your casting process?

A: Internal porosity (tiny air pockets) is the enemy of tensile strength. We eliminate this risk through a highly controlled Gravity Die Casting and precision Sand Casting process. We strictly regulate the pouring temperature and use advanced gating systems in our molds to ensure smooth, turbulent-free metal flow. Furthermore, critical load-bearing batches are subjected to Non-Destructive Testing (NDT), such as X-ray or ultrasonic inspection, to guarantee a 100% solid internal structure before the parts ever reach the field.

Q4: Why do cast aluminum strain clamps undergo "T6 Heat Treatment"?

A: Raw cast aluminum has decent strength, but it isn't strong enough for the extreme tension of deadend applications. The T6 Heat Treatment involves solution heat-treating the cast clamp at a high temperature, quenching it, and then artificially aging it. This metallurgical process fundamentally alters the grain structure, dramatically increasing the yield strength and hardness of the aluminum alloy, ensuring the clamp will not stretch or deform under massive conductor tension.

Q5: Why does the utility industry prefer Ductile Iron over Malleable Iron for structural castings?

A: Safety and mechanical reliability are the primary reasons. While both are cast irons, Ductile Iron (Nodular Iron) contains spherical graphite structures, giving it a much higher tensile strength and elongation (flexibility) that rivals carbon steel. It can absorb sudden shock loads—like heavy wind or ice dropping from a line—without shattering. Malleable iron is more brittle and prone to catastrophic failure under sudden impact, which is unacceptable for critical overhead poleline hardware.

Value-Added Supply Chain Services

1. Blanket Order & Free Warehousing Yokelink VALUE ADDED SUPPLY CHAIN (3)

Yokelink offers Blanket Order programs: Place an annual order to lock prices, we manufacture your total volume and hold stock in our facility free of charge. Split Shipments: Schedule partial shipments (e.g., monthly or quarterly) based on your project progress. You get the benefits of just-in-time delivery without the risk of shortages.

2. DDP Shipping (USA Duties Included)Landed Cost Certainty:

We handle the complex logistics. Our DDP (Delivered Duty Paid) service covers sea freight, US Customs clearance, and Section 301 tariffs. The price we quote is the final price delivered to your door / Warehouse.

3. Free Sample Program

We offer Free Samples to qualified commercial buyers for testing and approval.

4. Empowering Latin America's Utility Infrastructure

We have established a robust supply chain and a proven track record across Brazil, Mexico, El Salvador, Honduras, Nicaragua, Ecuador, Bolivia, Chile, Peru, Uruguay, Guatemala, Argentina, and the Dominican Republic. From standard distribution lines to complex 34.5 kV double-circuit transmission projects, leading utility contractors trust Yokelink for uncompromising quality and on-time delivery.