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Mechanical Wedge Action Grips

Description

The manual wedge action grip is designed for easy specimen loading, alignment and positioning. After initial face to specimen contact, gripping force will increase as the testing load increases. Virtually no pre-load is seen during specimen clamping due to Instron's design of moving grip bodies. This makes them particularly suitable for testing high strength materials, such as metals and composites, ensuring that specimen slippage is eliminated.

Principle of Operation

The wedge action principle of these grips allows them to be tightened onto a specimen without altering the vertical position of the faces in relation to the specimen. This is accomplished by a design, which moves the grip body to close the faces. This feature makes it possible to pre-select the exact point at which the specimen will be held with consistent gage length and no compressive force applied which may cause specimen buckling.

A strong clamping force can be applied to materials that are difficult to hold through a high mechanical advantage achieved by the tightening mechanism. The grip faces are spring loaded against a shoe which is in a fixed position in respect to the testing frame holding mechanism, only a light initial gripping force needs to be applied to the specimen. As the grip is tightened, it's frame is drawn up and the inclined sides push against the matching side of the faces which move laterally against the specimen. A shoe incorporated to the driving shaft prevents the faces from moving.

The open front design of the grip frames allows faces to be easily interchanged as well as easy specimen loading.

Because the faces are held in fixed position, there is no recoil, or loosening, when the specimen ruptures and if an extensometer is attached, it will remain in place.
2716 Series Mechanical Wedge-Action Grips
2716 Series Mechanical Wedge-Action Grips

Application Range

  • Type of Loading: tensile, static and tension cyclic tests. Not suitable for high cycle fatigue test.
  • Specimen Material: wires, plastics, metals, elastomers
  • Specimen Types: flat, round
View units as:
1 2
Cat#Item NameCapacityUpper FittingDetails
2716-002 Wedge Action Grips. Rated capacity: 100 kN 100 kN
(10,000 kgf)		0.5 in clevis pin (Type Dm) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 100 kN
2716-003 Wedge Action Grips. Rated capacity: 100 kN 100 kN
(10,000 kgf)		0.5 in clevis pin (Type Dm) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 100 kN
2716-008 Wedge Action Grips. Rated capacity: 150 kN 150 kN
(15,000 kgf)		M48x2mLH (Type IIm) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 150 kN
2716-010 Wedge Action Grips. Rated capacity: 5 kN 5 kN
(500 kgf)		0.5 in clevis pin (Type Dm) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 5 kN
2716-015 Wedge Action Grips. Rated capacity: 30 kN 30 kN
(3,000 kgf)		0.5 in clevis pin (Type Dm) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 30 kN
2716-016 Wedge Action Grips. Rated capacity: 1 kN 1 kN
(100 kgf)		6 mm clevis pin (Type Om) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 1 kN
2716-017 Wedge Action Grips. Rated capacity: 2 kN 2 kN
(200 kgf)		6 mm clevis pin (Type Om) Click to view item details and specificationsDownload this PDFWedge Action Grips. Rated capacity: 2 kN
2716-020Wedge Action Grips: Rated capacity: 50 kN50 kN
(5,000 kgf)		0.5 in clevis pin (Type Dm) Click to view item details and specificationsDownload this PDFWedge Action Grips: Rated capacity: 50 kN
2716-028Precision Wedge Action Grips. Rated capacity: 100 kN 100 kN
(10,000 kgf)		0.5 in clevis pin (Type Dm) Click to view item details and specificationsDownload this PDF
2716-030Precision Wedge Action Grips. Rated capacity: 250 kN 250 kN
(25,000 kgf)		M48x2mLH (Type IIm) Click to view item details and specificationsDownload this PDFPrecision Wedge Action Grips. Rated capacity: 250 kN
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