With endless applications and materials to test, comes the need for grips, fixtures, and connections of all sizes. The following page takes a comprehensive look at the various connection types that Instron has to offer and provides an organized view to understand and select the couplings and adapters needed for your application.

Need help finding the right coupling or adapter? Check our Compatibility Guide to learn about the various types of clevis interfaces commonly found on Instron's electromechanical systems. Please contact us if you have any questions.


Catalog no. 2501-093


Rigid Clevis to Clevis Adapters
Clevis to clevis adapters are used for grip and fixture connections that have a larger or smaller clevis than the load cell or machine adapter.

Rigid Clevis to Clevis Adapter Video
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Clevis Adapter Drawing
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Available Models
End 1 End 2 Connection Type Catalog No.
Male - Type OO
(6 mm connection with 2.5 mm clevis pin)		 Female - Type O
(12 mm connection with 6 mm clevis pin)		 Rigid 2501-350
Male - Type OO
(6 mm connection with 2.5 mm clevis pin)		 Female - Type C
(5/8 in. connection with 1/4 in. clevis pin)		 Rigid S1-13807
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type B
(1/2 in. connection with 3/16 in. clevis pin)		 Rigid 2501-134
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type C
(5/8 in. connection with 1/4 in. clevis pin)		 Rigid 2501-133
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Rigid 2501-093
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Female - Type O
(12 mm connection with 6 mm clevis pin)		 Rigid 2501-346
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Female - Type B
(1/2 in. connection with 3/16 in. clevis pin)		 Rigid 2501-119
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Female - Type C
(5/8 in. connection with 1/4 in. clevis pin)		 Rigid 2501-120
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Female - Type 1
(34 mm connection with 16 mm clevis pin)		 Rigid 2501-338
More Info
 



Catalog no. 2501-091


Flexible Clevis to Clevis Adapters
Clevis to clevis adapters are used for grip and fixture connections that have a larger or smaller clevis than the load cell or machine adapter. Flexible adapters are used for some applications for the alignment of specimens.

Flexible Clevis to Clevis Adapter Video
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Clevis Adapter Drawing
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Available Models
End 1 End 2 Connection Type Catalog No.
Male - Type OO
(6 mm connection with 2.5 mm clevis pin)		 Female - Type B
(1/2 in. connection with 3/16 in. clevis pin)		 Flexible 2501-115
Male - Type OO
(6 mm connection with 2.5 mm clevis pin)		 Female - Type C
(5/8 in. connection with 1/4 in. clevis pin)		 Flexible 2501-157
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type O
(12 mm connection with 6 mm clevis pin)		 Flexible 2501-348
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type B
(1/2 in. connection with 3/16 in. clevis pin)		 Flexible 2501-109
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type C
(5/8 in. connection with 1/4 in. clevis pin)		 Flexible 2501-094
Male - Type O
(12 mm connection with 6 mm clevis pin)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Flexible 2501-091
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Flexible 2501-356
Male - Type 1
(34 mm connection with 16 mm clevis pin)		 Female - Type C
(5/8 in. connection with 1/4 in. clevis pin)		 Flexible 2501-170
Male - Type 1
(34 mm connection with 16 mm clevis pin)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Flexible 2501-090
More Info
 



Catalog no. 2501-173


Clevis to Threaded Adapters
Clevis to thread adapters are used for grip and fixture connects on floor model systems when the load cell or machine has a threaded connection.

Clevis to Threaded Adapter Video
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Threaded Adapter Drawing
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Available Models
End 1 End 2 Connection Type Catalog No.
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Male - Type I
(M30x2 right hand thread)		 Rigid 2501-173
Male - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Male - Type II
(M48x2 right hand thread)		 Rigid 2501-172
Male - Type 1
(34 mm connection with 16 mm clevis pin)		 Female - Type O
(12 mm connection with 6 mm clevis pin)		 Rigid 2501-159
Male - Type 1
(34 mm connection with 16 mm clevis pin)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Rigid 2501-092
Male - Type 1
(34 mm connection with 16 mm clevis pin)		 Male - Type I
(M30x2 right hand thread)		 Rigid 2501-073
Male - Type 1
(34 mm connection with 16 mm clevis pin)		 Male - Type II
(M48x2 right hand thread)		 Rigid 2501-171
Male - Type I
(M30x2 left hand thread)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Rigid 8005-061
Male - Type II
(M48x2 left hand thread)		 Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Rigid 8005-062
More Info
 



Catalog no. 8005-042


Threaded to Threaded Adapters
Threaded adapters are generally used for grips and fixtures to account for high-capacity testing. They will be needed for most hydraulic load string connections, load strings over 100kN, and for systems with threaded base and load cell connections.

Threaded Adapter Drawing
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Available Models
End 1 End 2 Connection Type Catalog No.
Male - Type II
(M48x2 left hand thread)		 Female - 1.5 in. -12 right hand thread Rigid 2501-206
Male - Type II
(M48x2 left hand thread)		 Female - Type I
(M30x2 left hand thread)		 Rigid 2501-205
Male - Type II
(M48x2 left hand thread)		 Female - 2 in. -12 right hand thread Rigid 8005-022
Male - Type I
(M30x2 left hand thread)		 Male - Type I
(M30x2 right hand thread)		 Rigid 8005-041
Male - Type I
(M30x2 left hand thread)		 Male - Type II
(M48x2 right hand thread)		 Rigid 8005-045
Male - Type II
(M48x2 left hand thread)		 Male - Type I
(M30x2 right hand thread)		 Rigid 8005-046
Male - Type II
(M48x2 left hand thread)		 Male - Type II
(M48x2 right hand thread)		 Rigid 8005-042
Male - Type IIA
(M72x3 left hand thread)		 Male - Type IIA
(M72x3 right hand thread)		 Rigid 8005-043
More Info
 



Catalog no. 2501-113


Machine Base Adapters
Machine base adapters are generally used for connecting a grip or fixture to the machine. On machines 10 kN and below, a clevis adapter with a through hole for a screw is used. On 30 kN, 50 kN, and 100 kN machines, a flange adapter with clevis and bolt circle is used. For machines above 100 kN, see the threaded adapter section.

Machine Base Adapter Video
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Machine Base Adapter Drawing
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Available Models
End 1 End 2 Connection Type Catalog No.
6 x M10 Bolt Circle Female - Type D
(1.25 in. connection with 1/2 in. clevis pin)		 Rigid 2501-113
6 x M10 Bolt Circle Female - Type II
(M48x2 left hand thread)		 Rigid 2501-148
More Info
 



Quick-Mount Load Cell Adapter
Catalog nos. 2501-212 & 2501-213


Quick-Mount Load Cell Adapters
Quick-mount load cell adapters make it easier to secure load cells up to 50 kN to the crosshead. One part of the adapter mounts to the crosshead, the other to the load cell – allowing the load cell to hang securely from the crosshead unaided while you thread the through-bolt to complete installation. Additional load cell adapters are available for use with several load cells.

Quick Mount Adapter
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Operator Installing Load Cell with Quick-Mount Adapter
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Available Models
Description Catalog No.
Full Kit for 5900 or 6800 Table Model to 2580, 2530, and 2525 Series Load Cells
(comes with crosshead adapter and one load cell adapter)		 2501-212
Additional Load Cell Adapter for 500 N - 5 kN 2580 Load Cells 2501-213
Additional Load Cell Adapter for 10 kN – 50 kN 2580 Load Cells 2501-214
Additional Load Cell Adapter for 5 N – 5 kN 2530 Load Cells 2501-215
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Catalog no. 2501-208


Piggyback Load Cell Adapters
Piggyback load cell adapters allow the system’s primary load cell to remain in place while a secondary, low-capacity load cell is installed.

Piggyback Load Cell Adapters
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Piggyback Load Cell Adapter
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Available Models
Compatible Primary Load Cell Connection Type Compatible Secondary Load Cells Catalog No.
Type D 500 N to 5 kN  For mounting 2580 Series load cells. 2501-208
Type D 5 N to 5 kN  For mounting 2530 Series load cells. 2501-210
Type D 10 kN to 50 kN  For mounting 2580 Series load cells. 2501-209
Type II (M48) 500 N to 50 kN  2580 Series from 500 N to 50 kN (M10 or M16 attachment bolt)
2530 Series from 500 N to 50 kN (M10 or M16 attachment bolt)
2525 Series from 50 kN or less
2519 Series from 10 N to 5 kN (M6 or M10 attachment bolt)
2518 Series from 50 kN or less		 2501-227
Type IIA (M72) 500 N to 50 kN  2580 Series from 500 N to 50 kN (M10 or M16 attachment bolt)
2530 Series from 500 N to 50 kN (M10 or M16 attachment bolt)
2525 Series – 500 N to 50 kN
2519 Series from 10 N to 5 kN (M6 or M10 attachment bolt)		 2501-228
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Catalog no. 2501-256


Piggyback Load String Adapters
Piggyback load string adapters allow high-capacity grips to remain on the load string while providing a connection to utilize a wide variety of other fixtures.

Piggyback Load String Adapters
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Piggyback Load String Adapter
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Available Models
Primary Grip Connection Provided Catalog No.
100 kN Hydraulic Wedge Grip (Catalog no. 2743-401) Type Df (Low Profile) 2501-258
100 kN Hydraulic Wedge Grip (Catalog no. 2743-401) Type Df 2501-260
300 kN Hydraulic Wedge Grip (Catalog no. 2742-501) Type II (M48) 2501-255
300 kN Hydraulic Wedge Grip (Catalog no. 2742-501) Type Df 2501-256
600 kN Hydraulic Wedge Grip (Catalog no. 2743-601) Type IIA (M72) 2501-259  This adapter can only be used for compression applications.
100 kN Precision Manual Wedge Grips (Catalog no. 2716-028)
250 kN Precision Manual Wedge Grips (Catalog no. 2716-030)		 Type Df 2501-700
100 kN Precision Manual Wedge Grips (Catalog no. 2716-028)
250 kN Precision Manual Wedge Grips (Catalog no. 2716-030)		 Type II (M48) 2501-702
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Drop-Through Load Cell Adapters
Catalog nos. 2501-290 & 2501-291


Drop-Through Load Cell Adapter Kits
Drop-through load cell adapters enable the mounting of 2580 Series load cells to legacy Instron universal testing systems and systems that have had a 6800 Series system retrofit. The adapters are placed directly through the crosshead and can be used on both table model and floor model systems up to 100 kN force capacity.

Drop-Through Load Cell Adapters
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Drop-Through Load Cell Adapter
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Available Models
Frame Compatibility Load Cell Compatibility Maximum Daylight Reduction Catalog No.
4464, 4465, 4466, 5564, 5565, 5566 2580 Series
(500 N - 10 kN)		 153 mm 2501-290
4467, 4469, 5567, 5569 2580 Series
(500 N - 10 kN)		 165 mm 2501-291
4481, 5581 2580-50kN
(50 kN)		 133 mm 2501-291
4482, 5582 2580-100kN
(100 kN)		 111 mm 2501-292
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Universal Spherical Tension Adapters
Universal Spherical Tension Adapter (USTA) kits provide a unique spherical movement for tension applications where alignment is critical and minor compensation is required. These threaded adapters are used for mounting tension fixtures to the machine load cell or base, or for secondary load string adaptation.

Available Models
Force Capacity End 1  Machine Interface End 2  Accessory Interface Connection Type Catalog No.
300 kN Type IIm
(M48x2m LH)		 300 kN Capacity: Type R4m (M36x4)
100 kN Capacity: Type R3f (0.75-10)		 One Spherical
One Rigid		 W-5551-A
300 kN
Shortened		 Type IIm
(M48x2m LH)		 Full Capacity: Type R4m (M36x4)
100 kN Capacity: Type R3f (0.75-10)		 One Spherical
One Rigid		 W-5551-G
300 kN Type IIm
(M48x2m LH)		 300 kN Capacity: Type R4m (M36x4)
100 kN Capacity: Type R3f (0.75-10)		 Two Spherical W-5551-B
100 kN Type Dm
(1.25 in Connection)		 Full Capacity: Type R4m (M36x4 RH)
100 kN Capacity: Type R3f (0.75in-10 RH)		 One Spherical
One Rigid		 W-5551-H
300 kN Threaded Adapter Bushing Kit Type R4f (M36x4f)   Rigid W-5551-D
600 kN Type IIAm
(M72x3m LH)		 600 kN Capacity: Type IIm (M48x2m)
100 kN Capacity: Type R3f (0.75-10) thread		 One Spherical
One Rigid		 W-5552-A
600 kN Type IIAm
(M72x3m LH)		 600 kN Capacity: Type IIm (M48x2m)
100 kN Capacity: Type R3f (0.75-10) thread		 Two Spherical W-5552-B
400 kN Type IIm
(M48x2m LH)		 400 kN Capacity: Type IIm (M48x2m)
100 kN Capacity: Type R3f (0.75-10) thread		 One Spherical
One Rigid		 W-5552-E
400 kN Type IIm
(M48x2m LH)		 400 kN Capacity: Type IIm (M48x2m)
100 kN Capacity: Type R3f (0.75-10) thread		 Two Spherical W-5552-F
600 kN Threaded Adapter Bushing Kit Type IIf (M48x2f)   Rigid W-5552-G
More Info