Internal circlip pliers Rennsteig 780 135 2 size I51 are engineered for the installation and removal of circlips in large bore holes. These pliers accommodate circlips with diameters from 122 to 300 mm, addressing the needs of industrial maintenance and assembly operations. The tool body is constructed from high-quality tool steel, ensuring structural integrity under repeated mechanical stress. The overall length of 590 mm provides adequate leverage for working with large-diameter circlips.
The pliers incorporate a ratchet mechanism that locks the working position during operation. This feature stabilises the tool when engaging circlips in deep or difficult-to-reach bore holes. A releasable locking mechanism allows quick adjustment and repositioning. The precision tips are slip-resistant and sturdy, designed specifically for internal circlip applications. These tips are interchangeable, hardened, tempered, and galvanised to resist wear and corrosion. The black powder coating protects the pliers body from environmental degradation.
Weighing 1420 g, the tool balances heft with manoeuvrability. The size I51 designation corresponds to the specific tip geometry and bore hole range. Spare tips are available under part number 780 135 5 0, enabling cost-effective maintenance. The pliers carry EAN 4049002020759 and are classified under eCl@ss 10.1 ACD207012, ETIM 7.0 EC002228, and proficl@ss 7.0 AAC470c002.
The pliers body is fabricated from high-quality tool steel, selected for its hardness and resistance to deformation. Tool steel maintains dimensional stability under load, which is necessary when applying force to circlips seated in large bore holes. The ratchet function integrated into the handle assembly locks the pliers at a set opening, preventing unintended closure during circlip engagement or removal.
The releasable locking mechanism allows the operator to disengage the ratchet and reposition the pliers without removing them from the work area. This design reduces cycle time in repetitive assembly tasks. The black powder coating provides a uniform protective layer that resists scratching and chemical exposure, extending the service life of the tool in workshop environments.
The precision tips are manufactured separately and attached to the pliers body, enabling replacement when wear occurs. Each tip is hardened and tempered to achieve a balance between hardness and toughness. Galvanisation adds a protective zinc layer that inhibits rust formation. The slip-resistant design ensures secure engagement with circlip grooves, reducing the risk of slippage during installation or removal.
Interchangeable tips reduce total cost of ownership by allowing replacement of worn components without discarding the entire tool. The hardening and tempering process increases surface hardness while maintaining core toughness, preventing brittle fracture under load. Galvanisation provides corrosion resistance in humid or chemically active environments, common in industrial maintenance settings.
Size I51 designates the specific tip geometry and opening range of the pliers. The tool is rated for bore holes from 122 to 300 mm in diameter. This range covers large circlips used in heavy machinery, gearboxes, hydraulic assemblies, and industrial drive systems. The 590 mm length provides the mechanical advantage required to compress or expand circlips of this size.
The bore hole range of 122 to 300 mm indicates the minimum and maximum internal diameters for which the pliers are designed. The circlip diameter range of 122 to 400 mm reflects the outer diameter of circlips that can be handled, accounting for the thickness of the circlip wire and the depth of the groove. Operators should verify circlip specifications against the tool capacity before use.
Internal circlip pliers size I51 are used in the assembly and disassembly of large rotating machinery, including electric motors, industrial gearboxes, and hydraulic pumps. Circlips in these applications secure bearings, shafts, and other components within housings. The pliers enable technicians to compress circlips for insertion into bore holes or to expand them for removal without damaging the circlip or the surrounding components.
Typical applications include maintenance of wind turbine gearboxes, marine propulsion systems, mining equipment, and heavy construction machinery. The ratchet function is particularly useful in confined spaces where continuous hand pressure is difficult to maintain. The interchangeable tips allow a single tool to serve multiple maintenance tasks, reducing the number of specialised tools required in a service kit.
In automotive and aerospace manufacturing, these pliers are employed during sub-assembly of transmission housings and engine components. The slip-resistant tips ensure reliable engagement with circlip grooves, minimising the risk of component damage during high-volume production. The galvanised finish on the tips prevents contamination of sensitive assemblies with rust particles.
The product data sheet for Rennsteig 780 135 2 provides the following technical information. Article number 780 135 2 corresponds to the internal circlip pliers size I51. The EAN code is 4049002020759. The tool weighs 1420 g and has an overall dimension of 590 mm. The size designation is I51, and the pliers are rated for bore holes from 122 to 300 mm.
The pliers body is made from high-quality tool steel. The tips are slip-resistant, sturdy, and precision-ground for internal circlip applications. Tips are interchangeable, hardened, tempered, and galvanised. The tool incorporates a ratchet function to lock the position of the pliers during operation. A releasable locking mechanism allows adjustment. The surface is finished with a durable black powder coating.
Spare tips for this model are available under part number 780 135 5 0. Classification codes include eCl@ss 10.1 ACD207012, ETIM 7.0 EC002228, and proficl@ss 7.0 AAC470c002. The manufacturer is Rennsteig Werkzeuge GmbH, located at An der Koppel 1, 98587 Steinbach-Hallenberg. The data sheet is dated 14.03.2026 and notes that technical modifications and errors are reserved, and that illustrations may vary.
| SKU | Image | Price VNĐ | Product name & short description | |
|---|---|---|---|---|
| 780 135 5 0 |
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694.000
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spare tips
Spare tips I51, tip Ø 3.5 mm
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