In low voltage overhead ABC cable distribution networks, anchor clamps are essential accessories to secure 4-core service cables on building facades or utility poles. The service connection point is the most frequently handled section of the entire low-voltage grid: it is where the aerial bundled cable leaves the pole, crosses the street or the yard, and enters the customer's building. Without reliable anchoring hardware, the service cable can sag, swing in the wind, rub against the facade and eventually pull loose under its own weight and span tension.
Jera Line STF anchor clamp is a high-performance industrial alternative to the standard adjustable PA25 clamp, suitable for residential power supply, public lighting and distribution networks up to 1 kV. Developed and manufactured by Jera Line, a dedicated LV & MV cable accessory factory in Yuyao, Ningbo, China, the STF service anchor clamp is engineered for insulated 4-core ABC cables of 16–25 mm², delivering a verified 2 kN minimum breaking load with fully tool-free installation. It is widely used at customer service connections, building facades, poles and wall mounting points where the service line needs to be anchored quickly, safely and durably.
This blog elaborates on its product features, technical specifications, application scenarios, and core advantages of selecting Jera Line as your overhead cable tension clamp supplier.
Jera Line STF anchor tension clamp is a tool-free wedge-type fixture specially designed for 4×16–25 mm² insulated ABC bundled cables, serving as a functional replacement for adjustable PA25 anchor clamps with identical mechanical bearing capacity.
The Pince d'ancrage PA25 clamp is one of the most widely referenced service anchor fittings in European low-voltage distribution practice, used to dead-end four-core ABC service cables at poles and facades. The STF matches this application scope while simplifying the installation principle: instead of requiring bolts to be tightened to a specified torque, the STF locks the cable by a sliding self-locking wedge that grips tighter as the cable tension increases.
The clamp consists of three main components, each selected for long-term outdoor service. The wire bail is made of hot-dip galvanized steel, giving the clamp a corrosion-resistant hanging point that can be attached to pole brackets, wall brackets or stainless steel banding. The body is molded from UV-resistant, fiberglass-reinforced polymer, which provides high mechanical strength, electrical insulation and resistance to sunlight, acid rain and coastal salt spray. The wedge uses the same UV-resistant, fiberglass-reinforced polymer material and is designed to fit the outer diameter of both 16 mm² and 25 mm² service cables.
Its self-adjustable wedge structure greatly simplifies field installation procedures. Traditional clamps require matching torque wrenches for tightening, and an incorrectly torqued clamp can either crush the cable insulation or hold the cable too loosely. The STF avoids both failure modes: after threading the cable through the body and over the wedge, the electrician pulls the cable to tension, and the sliding wedge moves into its locking position automatically. The higher the cable tension in service, the tighter the wedge grips, so the clamping force always matches the actual load. No torque wrench, no crimping tool and no separate loose parts are needed on site. It is mainly used for terminal fixing of residential service cables, wall hanging points, and overhead low-voltage line anchoring on utility poles, covering exactly the installation points where a PA25 adjustable clamp would be specified in a conventional tender.
| Product code | Cable size, mm² | Minimum breaking load (MBL), kN |
|---|---|---|
| STF | 4x 16-25 | 2 |
The STF anchor clamp is rated for low-voltage overhead distribution networks up to 1 kV and is designed for four-core insulated ABC service cables with conductor cross-sections from 16 mm² to 25 mm². Its 2 kN minimum breaking load provides a clear mechanical safety margin for the combined effect of cable dead weight, wind gust loading and ice accumulation on typical service spans. The product is delivered as a complete pre-assembled unit with the wire bail, body and wedge ready to use, so there are no small parts to lose at height and no assembly errors on site.
The sliding self-locking wedge locks automatically by cable tension. Electricians do not need to carry auxiliary tools such as torque wrenches, significantly shortening construction time per household. On a typical service connection job, the crew simply threads the four-core ABC cable through the clamp, pulls it to the required sag and lets the wedge lock, so locking quality no longer depends on the operator's skill or the calibration of a torque tool.
The glass fiber reinforced plastic body reaches a minimum breaking load of 2 kN, capable of resisting tension caused by strong wind, snow and cable self-weight, ideal for long-distance overhead wiring. In service, the clamp continuously carries the span tension of the ABC cable between the pole and the building, including dynamic loads from wind-induced vibration. The 2 kN rating, verified by tensile testing in the factory laboratory, gives designers and contractors a defined mechanical limit that can be checked against the span length, conductor weight and local wind zone before procurement.
Plastic components are blended with UV-resistant raw materials to resist acid rain and coastal salt spray erosion. The metal hanging lug adopts hot-dip galvanizing technology, resisting rust and aging for decades of outdoor use. Because service anchor clamps are mounted in exposed positions where they face direct sunlight, rain, frost and saline atmosphere, material selection directly decides service life. The fiberglass-reinforced polymer body and wedge are formulated for long-term UV exposure without embrittlement, while the hot-dip galvanized wire bail protects the load-bearing hanging point from corrosion, avoiding the rust-through failures that can occur on poorly protected steel fittings.
The wedge fits cable outer diameters of both 16 mm² and 25 mm², distributing pressure evenly without cutting cable insulation, eliminating risks of insulation damage and heat generation in long-term operation. Unlike bolt-type clamps that concentrate pressure at the contact points, the self-locking wedge spreads the holding force along the cable circumference and locks progressively as tension builds. This protects the insulation jacket of the ABC cable, which is critical because a damaged jacket can allow moisture ingress and lead to premature insulation breakdown on an energized service line.
It can be directly matched with CA-1500 fixing brackets, cable ties, hooks and other universal hardware accessories, fully interchangeable with fittings for traditional PA25 clamps. The wire bail design matches standard pole-mount and wall-mount hardware used across European low-voltage distribution projects, so contractors can replace an existing PA25 clamp with the STF without changing brackets, banding or installation methods. This interchangeability simplifies spare-part stocking and field replacement work.
Manufactured directly by the source factory without middlemen, the unit price is far lower than imported PA25 clamps while fully complying with international power distribution industry standards. Because Jera Line controls injection molding, stamping, surface treatment and assembly in-house, there is no import margin, no freight mark-up and no distributor layer built into the price. For projects with hundreds or thousands of service connection points, the saving per clamp becomes a significant part of the overall hardware budget.
4 core STF anchor clamps are exclusively designed for all low-voltage overhead lines equipped with 4-core ABC bundled cables:
If you are seeking a stable, cost-effective alternative to adjustable Pince d'ancrage PA25 anchor clamps for 4-core ABC cable, Jera Line STF anchor clamp is the optimal solution for low-voltage distribution overhead engineering.
Featuring tool-free installation, all-weather weather-resistant materials and full compliance with international standards, it is an essential overhead fitting for electricians, power distributors and grid engineering contractors. The sliding self-locking wedge removes torque-tool dependency, the fiberglass-reinforced polymer and hot-dip galvanized construction guarantee long-term outdoor durability, and the 2 kN verified breaking load gives designers a clear mechanical basis for span planning.
Feel free to contact the Jera Line team to get free product samples, complete technical data sheets and exclusive quotations based on your order quantity! We support sample evaluation, bulk delivery and OEM packaging, and our engineers are ready to help you select the right anchor clamp for every residential, municipal and PV service connection project.
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