These stainless steel needle-nose pliers are purpose-built for the non-destructive removal of rigid endoscope rear connectors, eyepiece housings, and light guide connectors. They deliver a stable, controllable clamping force together with precise torque transmission, allowing bonded or tightly fitted components to be separated safely while keeping mechanical stress on the delicate scope body to an absolute minimum.
The tool set comes in two sizes-large and small-designed to match the specific interface dimensions of different pipe diameter ranges; this ensures a precise fit and prevents stress concentrations and workpiece damage that can result from using generic tools with ill-fitting dimensions.
Specifications and Key Jaw Dimensions
The main difference between the two sizes lies in the diameter of the circular relief recess machined into the inner jaw wall, plus the overall handle length. That recess is what makes these pliers work: when you clamp a cylindrical interface, the jaw wraps around the OD in a form-fitting contact that spreads the load over a larger surface area, drops the contact pressure, and clears the thread crests so nothing gets crushed.
Relief Recess Diameter (ΦD)：
Large Pliers (left image)：11.5 mm,9.5 mm,7.85 mm
Small Pliers (right image)：4.1 mm,4.0 mm
Those are just two common size groups. Additional recess diameters such as 2.7 mm, 2.9 mm, 3 mm, 7.5 mm, 9 mm, 12 mm, and 13 mm are also available, and custom sizes can be produced on request. [Contact us →]
Parameter Note：
- The relief recess is a semi-circular opening centered on the inner clamping face of each jaw and runs through the full thickness of the jaw.
- Recess walls are mirror-polished to Ra ≤ 0.4 to eliminate any risk of scratching the workpiece surface.
- Overall lengths are approximately 210 mm for the large pliers (left) and 160 mm for the small pliers (right). Handle and jaw lengths are proportioned to give a sensible leverage ratio-easy on the hand and easy to feel what the tool is doing.
Disassembly Instructions
Removing Non-Threaded Parts
①Secure the endoscope in a bench vise and warm the interface evenly with a heat gun.
②Select pliers of corresponding specifications (match the relief hole according to the outer diameter of the workpiece).
③Clamp the outer diameter of the interface so the recess seats against the curved surface. Tighten just enough to prevent slipping-do not over-tighten.
④Apply a slow, steady axial pull while rocking the part back and forth slightly. This shears the adhesive bond at the interface until the part releases.
⑤Once the part is free, wipe the jaws and relief recesses with alcohol to remove any adhesive residue or metal debris and restore a clean clamping surface.
Removing Threaded Parts
①Secure the endoscope in a bench vise. Select the correct plier size and seat the relief recess against the part's outer diameter.
②Clamp the outer diameter lightly-just enough to overcome rotation resistance without leaving any visible indent on the surface.
③Apply heat as needed and turn steadily in one direction. Torque transmits through the outer wall to the internal thread interface.
④After the threads fully disengage, release the pliers. Clean the jaws and relief recesses with alcohol to remove adhesive residue and metal debris, restoring a clean clamping surface.
