Wrap Grips for Universal Testing Machines

Products > Tensile Grips > Wrap

 

Wrap Grips are also known as webbing grips or capstan fixtures and are designed for tensile testing of flat cordage - ribbons, slings, straps,  tarpaulin, and webbing. The flexible material is wound around the wrapping column and then secured with locking pins prior to the tensile test. These grips are ideal for high-strength textile webbing materials that are used in industrial applications such as shipping and construction. 

 

Custom Wrap Grips are also available on request. Special capstan grip projects that have been completed include extra wide grips and also a center wrapping drum with a knurled finish. 

                                                                        ASTM

A1023

D6775

D4268

D2256

D378

 

 

How to use Capstan Grips

Capstan Grips are easy to use,  however there are a few pointers that should be noted. 

1. Orient both fixtures so that they are facing the same way. They should mirror each other, rather than being offset.

2. Arrange the sample so that the connected end of the ribbon is aligned along the centerline of the apparatus. 

3. Always use both locking pins if there are 2. (20kN and up)

4. If the sample is slipping, try wrapping it around several more times.

5. Be sure to stand away from the machine when it is in operation. Test breaks from webbings, capstans, slings, and similar materials can be violent. Safety Glasses are recommended.

Small Webbing Grip
225 lb. Small Webbing Grip - 1kN

These types of grips and fixtures are different than the previous wrap grips because they are designed for wider samples. Ribbons, Straps and Webbings are tested with these grips.

Small Webbing Grip
1K lb. Webbing Grip - 5kN

These grips are perfect for testing ribbons and smaller strap type materials. They are a cheaper option because they are designed only to test narrow bands of about 1 in. in width.

10kN Webbing Grip
2K lb. Webbing Grip - 10kN

These grips are slightly more robust than the smaller versions. To attach a webbing, guide the end through the center opening and wrap the sample on top of itself. Secure the ribbon by using the locking pin. Please see the Literature for more information

20kN Webbing Grip
4.5K lb. Webbing Grip - 20kN

These webbing and strap grips are used on dual column Universal Testing Machines.

50kN Webbing Grip
11K lb. Webbing Grip - 50kN

This version of the web fixture is made specifically for thinner ribbons. The working principle is the same but the design is more compact. A male adapter is pictured here. 

 
100kN Webbing Grip
22K lb. Big Webbing Grip - 100kN

The largest webbing grips use two locking pins instead of one. There are several different sizes for the center drums. Other options include substitute metals suitable for environmental chambers, and knurled or bumpy cylinder surfaces.