Fastens grating to a horizontal-facing steel structural member edge.
The model GG- describes an assembly of fastener parts identical but for materials of construction, that each contain three common parts. First is a G-Clips unique top for better holding strength and to suit 19W4 grating. Second, a G-Clips patented bottom connects to the beam underside. A hex-headed cap screw connects the two, and its length suits the grating height being installed.
|Key||Part Name||Carbon Steel
|A||Body Thickness||7/8 in.||11/16 in.||3/8 in.|
|B||Body Depth||11 Gauge||13 Gauge||11 Gauge|
|C||Body Depth||1-1/8 in.|
|D||Body Flange Height||1/8 in.||*|
|E1||Jaw Opening, GG-1||13/16 in.|
|E2||Jaw Opening, GG-2||1-5/16 in.||*|
|F1||Height, GG-1 body unit||1-3/4 in.|
|F2||Height, GG-2 body unit||2-1/4 in.||*|
|G||Hole Location from Edge||1/4 in.||*|
|H||Jaw Depth from Edge||5/8 in.|
|I||Top Plate Thickness||14 Gauge||16 Gauge||16 Gauge|
|J/K||Top Plate Size, Length x Width
Type R (Round)
|1-1/2 x 1-7/8 in.||2-1/8 in. dia.
1-1/2 x 1-3/8 in.
1-7/8 in. sq.
2-3/8 in. sq.
|2-1/8 in. dia.|
|L||Top Plate Depth or Height||1/8 in. dp.||3/16″ high|
|M||Hex Head Cap Screw||1/4″-20|
|N||Length of Thread||(varies according to grating height)|
|Notes: *denotes a dimension not contained in some models|
|Grating Thickness||Structural Member Flange Thickness|
|1/4″ to 3/4″||3/4″ to 1-1/4″||1-1/4″ to 1-3/4″||1-3/4″ to 2-1/4″|
|Other sizes are available from stock. Please consult our technical department.|
Galvanized, carbon steel
- grating fasteners.
- Fasteners body units are stamped, using 11 guage hot-rolled, pickled and oiled, steel coils, conforming to ASTM A-366.
- Top units are identical, except that 16 guage coil is used, and conforms to ASTM A-569.
- Top and body units are mechanically galvanized, after stamping, with galvanized conforming to ASTM B-695, class 50 (2 mils thick).
- Threaded studs are grade 2 carbon steel, hex head cap screws, conforming to ASTM A-307, and
316 Stainless steel
- grating fasteners.
- Fastener body units are stamped, using 13 guage hot rolled and annealed stainless steel coils, conforming to ASTM A-240 and ASME SA-240.
- Top units are identical, except that 16 guage coil is used.
- Threaded studs are 316 stainless steel, hex head cap screws, conforming to ANSI B-18.2.1.
- Internal tooth lock washers are 410 stainless steel, conforming to ANSI B-27.1.
- grating fasteners
- Fastener body units are stamped, using 1/8″ thick, grade 5052 aluminum plate, conforming to ASTM B-209 and Federal Spec. Q2A-250/8.
- Top units are identical, except that 13 guage plate is used.
- Threaded studs are 6061 T-6 aluminum, hex head cap screws, conforming to Federal Spec. QQA-270.
G-Clips should be tightened by hand, using a 7/16″ nut driver. When fully tightened
by the average installer, a torque value of approximately 58 inch/ pounds torque is realized,
according to tests. This is sufficient to allow the clips to resist typical vibration and stress loads to which grating is often subjected.
For difficult site conditions, such as greater than normal vibrations, G-Clips
Galvanized, carbon steel models are suitable, and can be installed at a greater torque value.
Torque of 100 inch/ pounds is reasonable, and 130 inch/ pounds cause no damage to the
G-Clips. For more severe condition, stainless steel models can be used. They are capable
of added torque. Stainless steel models can be torqued to 150 inch/ pounds at installation
with no damage to the clip. The clip is still removable and reusable.
For more severe site conditions, such as large and regular variations or structural
movements, G-Clips stainless steel models can be installed at 200 inch/ pounds of torque.
This can cause some stretching of the threads, which provides an even higher resistance to
loosening. The clip is then often not removable by normal methods, and must instead be
jarred loose by sharp side impact to the lower unit. Such removal may prevent re-use of the
Long-term maintenance of grating installations
Grating installations must be regularly maintained to permit long term safety and
economical use. Grating installations are often stressed by constant vibrations, or by
temporary stresses caused structure movements, any of which can cause loosening of
grating fasteners. Temporary loadings, as occur when heavy objects are placed on the
grating, can cause grating to cantilever upward across beams, causing a lifting motion. This
stresses and loosens fasteners. Often, fasteners are over-stressed to the point of failure of
the fastener to return to its original shape.
Grating fasteners should regularly be inspected visually, to determine that they
remain tightly in place. Simply bumping a fastener with a boot toe can reveal looseness.
G-Clips can be tightened with a 7/16″ nut driver, whenever a loose fastener is found.
G-Clips can be re-tightened many times, even following sufficient stresses. If a unit does
not respond to hand tightening, the threads have probably been over-stressed. Discard the
failed fastener, and apply a new unit, when needed.