The Series 647 Hydraulic Wedge Grips are versatile, easy-to-load grips for a wide range of tensile and fatigue applications. The symmetrical housing design ensures an even specimen loading across the entire face of the wedge. The lateral movement of the wedges won’t change the gripping position on the specimen once the grips are activated.
Side-loading lets you quickly and easily insert specimens
Excellent Repeatability
Clamp onto your specimen in the same position, test after test, to minimize the bending strains that can invalidate your test results
Adjustable Pressure
Hydraulic pressure can be adjusted, allowing these grips to be used for testing a variety of materials
Multiple Wedge Selection
A wide variety of wedges are available to meet your testing requirements
Full Product Information
Precise, easy-to-load grips for a wide range of tensile and fatigue applications
Test after test, MTS Series 647 Side-Loading Hydraulic Wedge Grips clamp your specimen in exactly the same way for consistent, repeatable testing results. Their superior alignment and constant, lateral gripping force minimize the bending strains, vertical loading forces and slippage that can invalidate test results and cost you time. The hydraulic pressure to these grips is supplied by an external grip supply and is adjustable. This allows the grips to be used for testing a variety of materials, including plastics and ceramics. An adjustable gripping force prevents damage to your specimens from grip or specimen slippage during your tests.
Your specimens are also protected by the Series 647’s preload chamber which locks all moving grip parts in position, eliminating backlash when cycling between tension and compression. These grips can be mounted on non-hydraulic frames when used with an optional, stand-alone hydraulic pump and valve assembly. They can also be mounted in environmental chambers when equipped with optional, high temperature hydraulic fluid and seals. A variety of wedges are available for the Series 647 grips and are sold separately. These grips are also available in axial-torsional models.
Features
These grips clamp onto your specimen in the same position, test after test, to minimize the bending strains that can invalidate your test results
Tension and fatigue capability
Calibration, cables and attachment kits are sold separately
Adjustable pressure allows these grips to be used for testing a variety of materials
Wide variety of wedges are available to meet your requirements
Side loading capability for easy specimen insertion
Four Versions of the 647 Family
Axial – This model has all of the standard features described above
Aluminum – The 647.02 (Axial model only) grip housings are made of aluminum. This lightweight design provides excellent response in high frequency applications and makes them ideal for tabletop use. It weighs only 7 kg (15 lb).
Axial-Torsional – This capability is available in three capacity ranges
All Temperature – These models allow for temperatures to 540°C (1000°F). Contact MTS for additional information.
For use on non-hydraulic load frames or for high temperature applications below -7°C (20°F) or above +66°C (+150°F), see our hydraulic grip supplies.
All grips are sold as pairs.
All wedges and attachment kits are sold separately.
Axial Model 647 Grip Specifications
MODEL
DYNAMIC FORCE
STATIC FORCE
PRESSURE
TEMPERATURE* MIN / MAX
OVERALL HEIGHT
DIAMETER
647.02B
25 kN (5.5 kip)
31 kN (7 kip)
21 MPa (3000 psi)
-40°C/177°C (-40°F/350°F)
131 mm (5.2 in)
150 mm (6.0 in)
647.10A
100 kN (22 kip)
120 kN (27 kip)
21 MPa (3000 psi)
-40°C/177°C (-40°F/350°F)
188 mm (7.4 in)
203 mm (8.0 in)
647.25A
250 kN (55 kip)
333 kN (75 kip)
70 MPa (10,000 psi)
-40°C/177°C (-40°F/350°F)
249 mm (9.8 in)
266 mm (10.5 in)
647.50A
500 kN (110 kip)
550 kN (120 kip)
70 MPa (10,000 psi)
-18°C to 65°C (0°F to 150°F)
291 mm (11.5 in)
330 mm (13.0 in)
647.100A
1000 kN (220 kip)
1200 kN (264 kip)
70 MPa (10,000 psi)
-18°C to 65°C (0°F to 150°F)
414 mm (16.2 in)
444 mm (17.5 in)
647.250
2500 kN (550 kip)
2750 kN (510 kip)
70 MPa (10,000 psi)
-18°C to 65°C (0°F to 150°F)
819 mm (32.3 in)
737 mm (29.0 in)
*Temperatures above 77°C/150°F require a stand-alone grip supply and extension rods.
MODEL
WEIGHT
WEDGE HEIGHT
METRIC/US STUD SIZE
PART NUMBER
647.02B
7 kg (15.4 lb)
38 mm (1.5 in)
M12 x 1.25 (1/2”-20)
056-670-901
647.10A
30 kg (66.1 lb)
63.5 mm (2.5 in)
M27 x 2 (1”-14)
047-080-605
647.25A
77 kg (170 lb)
89 mm (3.5 in)
M36 x 2 (1 1/2”-12)
047-080-905
647.50A
148 kg (324 lb)
95.3 mm (3.75 in)
M52 x 2 (2”-12)
047-595-505
647.100A
386 kg (850 lb)
127 mm (5 in)
M76 x 2
053-137-201
647.250
1153 kg (3335 lb)
165.1 mm (6.5 in)
N/A
Contact MTS
Wedges and attachment kits sold separately.
Specimen insertion depth in grip wedge from 3/4 of wedge height to full wedge height.
Specimen to not contact grip piston at full wedge height insertion.
Axial-Torsional Model 647 Grip Specifications
MODEL
AXIAL FORCE
TORSIONAL FORCE
PRESSURE
TEMPERATURE*
OVERALL HEIGHT
DIAMETER
647.02B-22
25 kN (5.5 kip)
220 N.m (2000 in.lb)
21 MPa (3000 psi)
-40°C/150°C (-40°F/300°F)
135 mm (5.3 in)
150 mm (6.0 in)
647.10A-05
100 kN (22 kip)
550 N.m (5000 in.lb)
21 MPa (3000 psi)
-40°C/121°C (-40°F/250°F)
188 mm (7.4 in)
203 mm (8.0 in)
647.10A-11
100 kN (22 kip)
1,100 N.m (10,000 in.lb)
21 MPa (3000 psi)
-40°C/121°C (-40°F/250°F)
224 mm (8.8 in)
203 mm (8.0 in)
647.25A-22
250 kN (55 kip)
2,200 N.m (20,000 in.lb)
69 MPa (10,000 psi)
-18°C/65°C (0°F/150°F)
343 mm (13.5 in)
266 mm (10.5 in)
*Temperatures above 77°C/150°F require a stand-alone grip supply and extension rods.
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