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SUMMARY OF HOLDING STRENGTH TEST RESULTS

Saddle Clips
Saddle Clips with Spring Clip
G-Clips Grating Fasteners

SADDLE CLIPS: Test results are as follows:

Saddle Clips, Galvanized

These models fail independent of the method used to attach them to the structural member. This is due to the saddle clip (essentially a metal strip formed in a single plane into a new shape) having no real beam strength. As a result, just as a simple pressure can form it, so a pressure can re-form it into another shape. And this is exactly what occurs when the grating to structural member is stressed. Saddle clips deform into a u-shape, and the grating is allowed to move upward, slipping past the clip wings, which point upward. The grating almost never can return to the installed position, since spring action in the u-shape causes the shape to spread after the grating rises, and as a result, the grating is help up, above the fastener new shape.

Failure occurs at various forces from as little as 200 pounds force to as much as 750 pounds. At no time during these tests was there failure of the threaded fastener holding the saddle clip to the structural member. Saddle clips always fail by deforming into the new u-shape.

Saddle Clips, Stainless Steel

These models also fail by turning into a new u-shape. Such reforming occurs at as little as 500 pounds force, and held to as much as 700 pounds force.

Methods of attaching Saddle Clips:

1. Welded studs are very secure. Properly applied, welded studs hold 3 to 4 times the ability of the saddle clip to maintain original shape. Approximately 15% fail during initial (wrong) application technique.

2. Shot studs, using powder-driven techniques, are a little less secure, since they are susceptible to failure if an sideways force occurs. This causes the shot stud, at rest in the hole it originally caused, to deform in its hole, and loosen. It can subsequently be pulled free of its attachment at a much smaller lifting force than before the sideways force was applied. Properly applied, welded studs hold 2 to 3 times the force which saddle clips can withstand.

3. Drilled and tapped combination fasteners, (called Tec screws) are a very secure method and their holding power greatly exceeds that of the saddle clip. 4. Holes drilled through the structural member, which allow the saddle clip to be bolted to the member, are very secure. Their holding power greatly exceeds that of the saddle clip.

SUMMARY OF TEST RESULTS: MECHANICAL FASTENERS

Test results are as follows:

Model (a) Mechanical Fastener [Saddle Clip]

This unit consists of a saddle clip, threaded bolt, and lower unit that contains a spring-loaded unit that connects to the grating underside (on its one end) and has a flat portion that rests on the underside of the beam (its other end). Lower unit is a lever arm in which the clamping action achieved by the threaded member is reduced by the lever length.

Tests show that the unit lower body deforms at forces of 250 pounds. No unit of this model has survived forces above 400 pounds force in our tests. Catastrophic deformation occurs, which renders the fastener incapable of further use.

Model (b) Mechanical Fastener [Saddle Clip]

This unit consists of a saddle clip, threaded bolt, and lower unit that contains a stair-step effect that connects to the grating underside and rests under the beam surface. Lower unit is also a lever arm, in which the clamping action achieved by the threaded member is reduced by the lever length.

Tests show that the unit saddle clip deforms at from 400 to 600 pounds force. No unit of this model has survived forces above 600 pounds force in our tests. Catastrophic deformation occurs, which renders the fastener incapable of further use.

G-Clips Grating Fasteners

This unit consists of a squared, saucer shaped top assembly which is folded on four sides, and depressed in the middle. It has a considerable amount of beam structure in its shape, and greatly increased holding power over saddle clips. The top is joined by a threaded fastener to the lower unit. Lower unit consists of a shaped member which has no lever arm. It concentrates clamping force into the holding face. Any force developed in the tightening action, which is directly on the same center line as the face of contact between the unit and the beam underside, is therefore converted directly into clamping force.

Tests show the galvanized carbon steel model GG- I A withstands a minimum loading of 550 pounds of force with no tendency to new shape. Test specimens have been tested to 950 pounds before loosening. No failure occurs. Unit is further tightened, and retains its ability to hold the grating in place. Tests show the stainless steel XSSGG-IA model withstands a minimum loading of 700 pounds of force while retaining its original shape.. Test specimens have been tested to I 100 pounds before loosening. No failure occurs. Unit is further tightened, and retains its ability to hold the grating in place.

It has been found that both G-Clip models tend to respond well to cyclic stresses as is seen during these tests. After cycles of loosening, further tightening, and retesting, the test specimens tend to achieve higher pressures before loosening. In this way, they actually increase their holding power during use, due to work-hardening. Catastrophic failure tends to occur by fracture of the cap screw.

No G-Clip test specimens have failed due to the top or the lower unit fracture.

See Certified Test Results Letter

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Phone: (800) 227-9013 Fax: (504) 394-1454
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