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Tools Introduction Class

Tools Introduction Class


Popularity : 29989

Pliers-Basic Principle

A plier is based on two arms of leverage design. The smaller external force which forced on the handle of pliers to transfer for bigger power. Pliers can clamp or cut efficiently.
When loaded the force on the arm of pliers, there will be another external force moved to increase along with leverage ratio.
In case of the pliers which have been produced a larger force, thus its distance (from the centre of the rivet to the handle) must be longer and the distance (from the rivet centre to the gripping jaws or cutting edge) must be as smaller as possible.

Pliers’ Principle of Leverage

Differences between Pliers

Cutting Pliers

For trimming or cutting objects.

Diagonal Cutting Pliers_6211

Diagonal Cutting Pliers


Heavy Duty Diagonal Cutting Pliers_6231

Heavy Duty Diagonal Cutting Pliers


End Cutting Pliers_6411

End Cutting Pliers


Stripping Pliers_6711

Stripping Pliers


Gripping Pliers

For gripping objects.

Groove Joint Pliers_6511

Groove Joint Pliers


Groove Joint Pliers_6516

Groove Joint Pliers


Slip Joint Pliers_6463

Slip Joint Pliers


Combination Pliers

For gripping and cutting objects.

Combination Pliers_6111

Combination Pliers


Long Nose Pliers_6311

Long Nose Pliers


Three Parts of a Plier

A plier can be separated into three parts.

  1. Handles:

    For holding.
    Handles that was designed based on ergonomic allow users to hold the grip safely and comfortably.

  2. Joint:

    Connection shaft of the plier.
    The joint should be steady and without shaking while using in order to easily operate the plier with a single hand.

  3. Head:

    With either cutting edges or gripping jaws.
    The edges are ground percisely into standard shape. To cut the wires easily, both edges should be sharpened and aligned to each other accurately.

Three parts of pliers_6111

The Distinction of Joint Structure

The lay-on joint The lap joint The box joint
Such as the pincers.
The two halves of the pliers are placed on top of each other - without being milled out - and riveted.
Such as the combination pliers.
Here one half of the pliers turns around the rivet but in a milled-out recess in the other shank.
Such as the groove joint pliers.
The box joint in which half of a pliers is pushed through a slit in the other half of the pliers.
Pliers is made by Alloy Steel , usually it will be produced by medium carbon steel (contained 0.45% carbon). But for high quality pliers whicH can be worked on industry, the pliers will be made of high carbon steel, like chrome vanadium alloy steel.

The Design of Rivets

There are two different ways to rivet the pliers:

Reverse action joint rivet
Forged on joint axis

Dr.Q reminds:
Use oil, such as WD-40, to maintain the polish surfaces and connection parts of pliers regularly, so they can be remained in good working conditions and extend the using lives.

Pliers Jaw

Flat Half-round Round
Flat jaws Half-round jaws Round jaws
For example:
The combination pliers are used to clamp things.
For example:
The long nose pliers are suitable for soldering works.
For example:
The electrician pliers are used to bend the coils.
There are three basic shapes of the pliers jaws, which are flat, round and half-round. Each shape is used for different purposes.

Direction and Position of Cutters

In order to cut wire in diverse thicknesses and materials efficiently, it is significant to choose a plier that is specifically disigned for the job. General pliers can be separated into three different cutting styles, which are diagonal, central and oblique cutters. Furthermore, all cutting edges were processed through high frequency procedures, or also be known as inductive hardening routine.

Diagonal cutters
Diagonal cutters Shape of diagonal cuttersIt is regarded as the most popular cutting style of pliers. Various lengths, shapes and cutting edges are suitable for different materials.
Center cutters
Center cutters Shape of center cuttersThey provide good stability at the cutting edges combined with a favorable cutting edge angle, i.e. a relatively small amount of force is needed to penetrate and "split" the wire. Consequently, the amount of hand pressure required is also reduced.
End and oblique cutters
End and oblique cutters Shape of End and oblique cuttersThey are used where access to wire is only possible or advisable from a frontal or angled position. This can also apply where a wire has to be cut close to the surface. (In this situation, using a diagonal cutter, the fingers around the handles would be in the way).

Main Cutting Types

Cutting Pliers can be divided into three different types of cutters

With bevel With bevel (standard)
Cutting edges with a bevel are suitable for all wire classes, depending on the nipper design and capacity.
With small bevel With small bevel (semi flush)
Cutting edges with a small bevel are suitable for all wire classes apart from piano wire, depending on the nipper design.
Without bevel Without bevel (full flush)
Cutting edges without a bevel are only suitable for soft materials, i.e. lead and plastics.

The Blade Angle of Diagonal Cutting Pliers

The Blade Angle of Diagonal Cutting Pliers

Blade angle:13 ~ 42°

Diagonal Cutting Pliers 6211:15°

Diagonal Cutting Pliers 6213:37°

Heavy Duty Diagonal Cutting Pliers 6231:15°

Plastic Cutting Pliers 6921:15°

Names of Each Part of the Plier Head

Names of Each Part of the Plier Head

Combination Pliers

Combination Pliers_6111

Hi-leverage Combination Pliers_6112

VDE Insulated Combination Pliers_6116A

The combination pliers can do (almost) anything. The basic functions of the combination pliers are gripping and cutting.

Cutting edge Serrated jaw Serrated round jaw
The cutting edges are suitable for cutting wire, nails, smaller cables. The serrated jaw is applicable to grip flat materials and small tools. The serrated round jaw is applicable to grip circle materials.
The 6112 series combination pliers use different leverage design, so they can cut wires more easier than general combination pliers and grip more solid.

Diagonal Cutting Pliers

Diagonal Cutting Pliers_6211

Diagonal Cutting Pliers_6213

Heavy Duty Diagonal Cutting Pliers_6231

Plastic Cutting Pliers_6921

VDE Insulated Diagonal Cutting Pliers_6216A

VDE Insulated Diagonal Cutting Pliers (Heavy Duty)_6236A

The diagonal cutting pliers are most commonly used. They are found in every electrician’s basic.
Principally, a good diagonal cutting pliers have induction hardened cutting edges which are sufficiently sharp and fitted each other exactly over the entire cutting edge length.

VDE Insulated Diagonal Cutting Plier cutting
The diagonal plier stripping and cutting wires

Please always placed the wire to be closer near its joint. It will increase the leverage and considerably reduces loaded force on it.

Circlip Pliers

External Straight Circlip Pliers_65SS

External Straight Circlip Pliers_66SS

External Straight Circlip Pliers (Japanese Type)_67SS

External Straight Circlip Pliers (European Type)_68SS

They served to be assembled and disassembled C clip. These are used on all the construction of vehicles and machinery, and they are especially used for fixing bearings on shafts or into bore holes.

Internal ring External ring
Internal rings are used in bore holes. Using an appropriate size of pliers for internal rings, the ring is pressed together, thereby reducing the diameter and allowing it to be put on or taken off. The external ring is used on axles and shafts. The pliers for external rings are used to enlarge the diameter so that the ring can be put on or taken off.

The external ring is used on axles and shafts. The pliers for external rings are used to enlarge the diameter so that the ring can be put on or taken off.

Link to Retaining Rings and Circlip Pliers to know more~

End Cutting Pliers

(Woodworking Pliers)

End Cutting Pliers_6431

End Cutting Pliers_6431

End Cutting Pliers are used widely and particularly popular because of their sturdiness. As their cutting edges are at the front and they are stable in construction, they are especially suitable for pulling out nails, clips...etc.

Long Nose Pliers

Long Nose Pliers_6311

Long Nose Pliers_6313

VDE Insulated Long Nose Pliers_6318A

"Long nose pliers with cutting edge" is a standard design. Their function is similar with the function of combination pliers, but their shape is much slimmer. The difference will be on its head the its gripping jaws is longer and narrower.

Groove Joint Pliers

6511 6511C 6516 6516C

The groove joint pliers are gripping pliers with an adjustable joint. The width of its jaw and gripping capacity can be changed according to the set position.

Groove Joint Pliers_6511

Groove Joint Pliers_6511C

Groove Joint Pliers_6516

Groove Joint Pliers_6511C

The angular or oval jaw opening is usually serrated and is also referred to as the burner hole. Originally the water pump pliers were used to tighten the packed glands in water pumps in motor vehicles, which is how they got their name. Water pump pliers are suitable for gripping all kinds of items with larger diameters too, regardless of whether they are round, square or hexagonal.
A good groove joint pliers which must be with a bigger capacity of its adjustable position.

Groove joint plier using

Locking Pliers

It can be clamped effectively when we are welding.

  1. Appearance: Curved jaws can be used in any place.
  2. Cutting Capability: Metal wires.
  3. Specifications and Capability:
Locking Plier using
Production Code HRC: 43 Clamping Diameter (mm / inch) Clamping Strength (FT)
6011 Wire cutting
(mm / inch)
6011-05R 1.2 / 0.0048" 31 / 1.25" 38 / 1.51" 12 / 0.5" 12 / 0.5" 225 300 300 400
6011-07R 2.3 / 0.091" 41 / 1.63" 48 / 1.92" 19 / 0.75" 19 / 0.75" 300 350 450 600
6011-07N 2.3 / 0.091" 41 / 1.63" 48 / 1.92" 19 / 0.75" 19 / 0.75" 300 350 450 600
6011-10R 2.3 / 0.091" 47 / 1.88" 54 / 2.15" 19 / 0.75" 19 / 0.75" 480 550 900 1200
6011-10N 2.3 / 0.091" 47 / 1.88" 54 / 2.15" 19 / 0.75" 19 / 0.75" 480 550 900 1200


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