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. 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 a fixed position, there is no recoil, or loosening when the specimen ruptures, and if an extensometer is attached, it will remain in place. With the optional specimen centering device, a specimen can be easily placed on center of the faces. This device is adjustable from front to back and locked on with thumb screws. Application range K Type of loading: tension *Not suitable for through-zero/reverse stress or fatigue testing K Specimen material: wires, plastics, metals, elastomers. K Specimen shapes: flat, round. Features K Rated capacity 30 kN (3,000 kg, 6,700 lb) K Quick set-up with rapid clamping and unclamping action K Self-tightening wedge design eliminates slippage K Interchangeable jaw faces for a range of specimen geometries and types K Fixed faces and moving body during specimen loading K Slack-free connection to test instrument K Quickly change faces without tools K Optional - specimen centering device K Temperature range: -73 C to 250 C (-100 F to 480 F) 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. Due to Instron's design of moving grip bodies, virtually no pre-load is seen during specimen clamping. This makes them particularly suitable for testing high strength materials, such as metals and composites, ensuring that specimen slippage is eliminated. A centering device is also available, enabling quick and accurate placement of the specimen and keeping the central loading axis lined with the load string. G 2716-015 Wedge action grips 2716 Series Manual Wedge Action Grips Catalog number 2716-015 G Specifications Accessories Grip dimensions Catalog Number Description 2716-011 Specimen centering device Catalog number 2716-015 Maximum capacity 30 kN (3,000 kg, 6,700 lb) Mechanical connection Upper fitting in clevis pin (Type Dm) Lower fitting in clevis pin (Type Dm) Effective length (A) Upper grip 203 mm (8.0 in) Lower grip 203 mm (8.0 in) Body width (B) 144 mm (5.67 in) Overall width (C) 220 mm (8.66 in) Weight per grip (no faces) 5.25 kg (11.0 lb 9 oz) Weight (faces) 450 g (1 lb) Temperature range -73 C to 250 C (-100 F to 480 F) Working principal Manual Wedge action Gripping length 57 mm (2.2 in) Maximum face movement 13 mm (0.5 in) G 2716-011 Specimen centering device G Faces. Vee-serrated, surfalloy, Flat serrated (1.0 mm), Flat serrated (1.5 mm) Faces Catalog Number Specimen Thickness Surface Clamping Area Application (width x height) 2703-151 0 to 6.4 mm Diamond Serrated 25 mm X 57 mm For gripping metal, plastic, and fiber (0 to 0.25 in) Pitch 1.5 mm (16 teeth per in) (1 in X 2.2 in) reinforced plastic specimens with or without 2703-152 6.4 to 12.6 mm shoulder tab ends (0.25 to 0.5 in) 2703-155 0 to 6.4 mm Diamond Serrated 25 mm X 57 mm For gripping metal, plastic, and fiber (0 to 0.25 in) Pitch 1.0 mm (25 teeth per in) (1 in X 2.2 in) reinforced plastic specimens with or without 2703-156 6.4 to 12.6 mm shoulder tab ends (0.25 to 0.5 in) 2703-160 0 to 6.4 mm Rubber Coated 25 mm X 57 mm For gripping fabrics, plastic tape and fine wires (0 to 0.25 in) (1 in X 2.2 in) 2703-157 0 to 6.4 mm Surfalloy Coated 25 mm X 57 mm For gripping Fiber reinforced plastic specimens (0 to 0.25 in) (Emery Grit of 100) (1 in X 2.2 in) without tabbed ends 2703-158 6.4 to 12.6 mm (0.25 to 0.5 in) 2703-153 3.2 to 7.8 mm Vee-Serrated(Note 3) For gripping round specimen with or without (0.125 to 0.3 in) Pitch 1.0 mm (25 teeth per in) shoulder tabs, and pipe/tube with plugs 2703-154 7.1 to 12.5 mm (1 in X 2.2 in) 2716 Series Manual Wedge Action Grips Catalog number 2716-015 Corporate Headquarters 100 Royall Street, Canton, Massachusetts 02021-1089, USA Tel: 800-564-8378 or 781-575-5000 Fax: 781-575-5751 Copyright Instron 2002. All rights reserved Instron is a registered trademark of Instron Corporation Instron reserves the right to change specifications without notice pod_2716_015b_1002 European Headquarters Coronation Road, High Wycombe, Bucks HP12 3SY, United Kingdom Tel: +44 1494 464646 Fax: +44 1494 456123 Notes: 1. Grip catalog number provides two grips. 2. Grips may require a coupling to connect to load cell or machine base 3. Upper grip may require a flexible coupling for certain applications. Notes: 1. Faces catalog number provides 4 faces. 2. All faces are hardened to 60-65 Rc, excluding rubber coated and if otherwise specified. 3. Threaded and Vee style faces are used for round specimens. www.instron.com 57 mm (2.2 in) on a 120 included angle vee groove