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Grate-Fast FG

For fastening fiberglass, aluminum, stainless or bronze bar grating to steel beams

Your choice of fiberglass (or non-corrosive metal) grating presumes a hostile environment. In these applications, drilling the steel (and penetrating coatings) is inappropriate and counter-productive. Instead, fasten your grating with the suitable model of Grate-Fast Model FG.


  • 300 Series Stainless Steel Bracket and Bolt
  • 300 Series Stainless Steel Investment Casting with reduced body width to fit spacing as close as 5/8”

Grate-Fast FG (#GF-FG-1—#GF-FG-4)

  • 5/16” socket head cap screw bolt, 300 series stainless steel
  • Uses 1/4” hex wrench
  • Profiled nose to fit on flat or sloping beam flanges
  • 3/8” thread engagement for full loading and resistance to corrosion in thread area
  • Stainless Steel 300 Series investment casting body
  • 14 or 16 gauge, 300 series stainless steel top-hat bracket with one offset wing or flat wings to fit spacing between bars of 5/8” to 2”
  • 2-1/4” cap screw bolt length to accommodate up to 2” bearing bar depth*
  • Stepped tail fits beam flanges from 1/8” to 3/4”

*Longer cap screw bolts to accommodate applications using greater bearing-bar depths available on special order.

Top Hat Offset and Flat Brackets (see chart for #)

  • 14 or 16 gauge top-hat offset or flat wing brackets also available individually

Parts Chart

Grate-Fast Installation


Step 1

Position the pre-assembled Grate-Fast with the body between the grating bars and the arrow on the nose pointing toward the steelwork with the top-hat bracket resting on the bearing bars. (Figure 1)

Step 2

Slide the Grate-Fast FG toward the steelwork until the nose fits under the beam flange. Where necessary, adjust the body/bolt to the approximate flange thickness/grating depth. (Figure 2)

Step 3

Tighten the cap screw bolt using the hexagon key. The Grate-Fast FG body casting will automatically rotate until it locks under the bearing bar, with the nose under the flange. Continue tightening to the recommended torque. Grate-Fast FG is now securely in position. (Figure 3)

Grate-Fast Specifications

 › Malleable iron to DIN 1692,
   corresponding to ANSI/ASTM A47-84-32510
 › Minimum yield strength: 32,500 psi
 › Minimum tensile strength: 50,000 psi
 › Modulus of elasticity: 25,000,000 lbs.
 › Minimum elongation: 10% in 2”
 › BHN range: 110–130
 › Machinability: 120
Bracket: ASTM-A 300 series stainless
Socket head cap screw bolt: AISI C1008 300 series stainless
Weight per 100 units: 35 lbs.

Torque recommendations:
Grate-Fast FG: 3 1/2 ft. lbs
Ultimate Load: 800 lbs.
Average Side Load (depending on depth and coating): 450 lbs.