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Quality — Made in Germany
KNIPEX 87 51 250 Cobra® ES Wasserpumpenzange extra-schlank
KNIPEX 87 51 250 Cobra® ES Wasserpumpenzange extra-schlank
KNIPEX 87 51 250 Cobra® ES Wasserpumpenzange extra-schlank
KNIPEX 87 51 250 Anwendung
KNIPEX 87 51 250 Cobra® ES Wasserpumpenzange extra-schlank
KNIPEX 87 51 250 Cobra® ES Wasserpumpenzange extra-schlank
KNIPEX 87 51 250 Cobra® ES Wasserpumpenzange extra-schlank
KNIPEX 87 51 250 Anwendung

87 51 250
Water Pump Pliers extra-slim

  • Ideal for service, maintenance and equipment repair, in automotive and general industry
  • Long, narrow jaws
  • Particularly good access to the workpiece due to very slim construction of head and joint area
  • Firm grip also on flat material due to three-point rest
  • Push the button for adjustment on the workpiece
  • Fine adjustment for optimum adaptation to different sizes of workpieces and a comfortable handle width
  • Self-locking on pipes and nuts: no slipping on the workpiece and low handforce required
  • Box-joint design for high stability due to double guide
  • Reliable catching of the hinge bolt: no unintentional shifting
  • Favourable lever action: optimum transmission of force
  • Pinch guard prevents operators' fingers being pinched
  • Chrome vanadium electric steel, forged, multi stage oil-hardened
Technical attributes
Article No.
87 51 250
grey atramentized
with non-slip plastic coating
328 g
250 x 43 x 16 mm
DIN ISO 8976
REACH compliant
does not contain SVHC  
RoHS compliant
not applicable  
Adjustment positions
Capacities for nuts
Ø 1 1/4
Capacities for nuts
34 mm
Capacities for pipes (diameter)
Ø 32 mm
max. parallel opening width
37 mm
max. gripping depth
42 mm

The high-tech water pump pliers

For work in poorly accessible areas

The benefits of working with the Knipex Cobra are plain to see: these water pump pliers are light and stable, can be adjusted on the component quickly at the touch of a button and are self-locking on pipes and nuts.

Grip quickly, adjust finely

For pipes, nuts, sleeves, for various kinds of components: apply the Knipex Cobra quickly and accurately with just one hand movement. The spring-loaded hinge bolt locks securely into place without adjusting inadvertently. The design of the gripping surfaces ensures a three-point contact on components with parallel surfaces and thus for a secure grip also on flat parts. Thanks to the 19-fold fine adjustment, the Cobra can be ideally adjusted to different sizes of the component. This fine adjustment also ensures that the distance to the handles remains hand-friendly for every opening width. Due to its extremely compact shape, the Cobra ES 87 51 250 offers considerable scope especially in confined spaces.

Tough and strong

The Knipex Cobra clamps onto the component securely by itself thanks to the jaw geometry developed by Knipex. This means the user can put all energy into the desired movement without pressing the pliers handle together – and thus without energy loss: round components can be turned, bolted connections tightened and released.

Brief overview

Modern high performance water pump pliers

18-fold fine adjustment at the touch of a button for fast adjustment to different sizes of component

Self-locking on pipes and nuts

Large grip width (up to a wrench opening of 34 mm / pipes 1 ¼ inches) with low weight (328 g)

Gripping teeth hardened to approx. 61 HRC using high frequency for a secure grip and a long service life

Very slim head and joint area for work in poorly accessible places

Thanks to three-point contact, particularly suitable for flat components, also grips round and angular components

High level of user comfort due to constant hand-friendly gripping position resulting from fine adjustment

Good, secure hold in the hand: grip coated with non-slip plastic

Chrome vanadium electric steel, forged, oil hardened

Knipex Cobra ES: several manufacturing steps for high tool quality

We forge the Knipex Cobra from chrome vanadium steel, and use a multiple stage hardening process to give it the ideal balance between hardness and toughness. This makes it extremely durable. To achieve a lasting secure “bite” on the work component, we use high-frequency current to bring the gripping teeth to a hardness of approx. 61 HRC.

Professional users expect a tool quality that will last for many hard years of work. We develop and manufacture our pliers for the most demanding users imaginable: for craftsmen. Every pair of pliers from Knipex is manufactured to the highest standards using the best materials. A purchase for many years of use during assembly work, on the building site, in production and in the workshop.

Convenient and fast: fine adjustment at the touch of a button

Gripping surfaces with specially hardened teeth

Particularly slim design in the whole head and hinge area

Has a self-locking grip on various sizes of flat, round and angular components

Technical changes and errors reserved.