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For fastening floor/checker plate to steel beams

Floor-Fast is fast, versatile, & economical

  • Eliminates scaffolding, welding and drilling of structural steelwork
  • Requires no access equipment or special tools
  • Requires no hole alignment in plates and beams
  • One fastener fits flanges from 3/16” to 5/8”
  • One fastener universally fits beams, channel and angles
  • Floor-Fast is completely removable


  • Counter-sunk flat socket cap screw bolt
  • Stepped surface fits flanges from 3/16” to 5/8” *
  • Bolts and castings available in both stainless and galvanized (zinc chromate) finishes
  • Two bolt sizes: 3/8” (10mm) and 1/2” (12mm)

* The standard Floor-Fast will fit steelwork flanges from 3/16” to 5/8” thickness. If working with thicker flanges, Struct-Fast can furnish longer cap screw bolts and additional packing washers on special order.

Galvanized or Stainless Steel Cap Screw Bolts

  • Available in two sizes: 3/8” (10mm) and 1/2” (12mm), galvanized (zinc chromate) or stainless steel finishes. Struct-Fast® can furnish longer screw bolts on special order.

Floor-Fast Installation

Use Floor-Fast to secure steel, aluminum, fiberglass or bronze floor/checker plate to the supporting steel or aluminum framework without field welding, drilling or tapping holes. Secure Floor-Fast to the bottom of the plate, position the plate in the floor opening and with a simple rotation of the socket head cap screw bolt, secure the plate. Simply reverse the installation process to remove the floor plate. No other system is faster to install.

Step 1

Layout, drill and counter-sink the holes in the floor plate. (Figure 1)

Step 2

Prior to installation, attach the Floor-Fast clamps to the floor/checker plate, positioning the clamp’s straight edge parallel to the edge of the plate (Figure 2). NOTE: The stepped surface of the FloorFast clamp faces toward the underside of the floor plate.

Step 3

Position the floor plate on the supporting framework.

Step 4

Using a hex wrench, release the socket head cap screw bolt one full turn (Figure 3).

Step 5

Tighten down on the bolt. As it tightens, the stepped surface automatically locks under the framework flange (Figure 4).

Step 6

Repeat the operation for each Floor-Fast clamp. Holes in floor plate should be 9/16” diameter, counter-sunk to accept the standard 1/2” counter-sunk flat socket cap screw bolt. Measure the positioning of the center of the hole drilled in the plate according to Figure 1.

Animated Installation Guide

Floor-Fast Specifications

 › Malleable iron to DIN 1692,
   corresponding to ANSI/ASTM A47-84-32510,
   tapped for a 1/2” countersunk flat socket cap bolt
 › Cap bolt corresponds to ANSI B18.3 1976
 › Galvanizing to ASTM Specification B695 Class 50
 › Weight per 100 units: 34 lbs.

Torque recommendations:
Floor-Fast: 16 ft. lbs

**The standard Floor-Fast will fit steelwork flanges from 3/16” to 5/8” thickness. If thicker flanges are encountered, Struct-Fast® can furnish additional packing washers.