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Curtain-Wall Connector Standoff Distances

Technical & Installation Notes

Model No. Fastener Pattern Depth of Stud
3 5/8" 6" 8" 10" 12"
SCB43.5 A 0" to 1" 0" to 1" 0" to 1" 0" to 1" 0" to 1"
SCB45.5/MSCB45.5 B 1 7/8" to 2 3/4" 0" to 2 3/4" 0" to 2 3/4" 0" to 2 3/4" 0" to 2 3/4"
C, D and E 0" to 1 1/2" 0" to 1 1/2" 0" to 1 1/2" 0" to 1 1/2"
SCB47.5/MSCB47.5 B 3 7/8" to 4 3/4" 1 1/2" to 4 3/4" 0" to 4 3/4" 0" to 4 3/4" 0" to 4 3/4"
C, D and E 1 1/2" to 3 1/2" 0" to 3 1/2" 0" to 3 1/2" 0" to 3 1/2"
SCB49.5 B 5 7/8" to 6 3/4" 3 1/2" to 6 3/4" 1 1/2" to 6 3/4" 0" to 6 3/4" 0" to 6 3/4"
C, D and E 3 1/2" to 5 1/2" 1 1/2" to 5 1/2" 0" to 5 1/2" 0" to 5 1/2"
SCB411.5 B 7 7/8" to 8 3/4" 5 1/2" to 8 3/4" 3 1/2" to 8 3/4" 1 1/2" to 8 3/4" 0" to 8 3/4"
C, D and E 5 1/2" to 7 1/2" 3 1/2" to 7 1/2" 1 1/2" to 7 1/2" 0" to 7 1/2"
SSB3.518/FSB3.518 B2 0" to 12 1/4" 0" to 12 1/4" 0" to 12 1/4" 0" to 12 1/4" 0" to 12 1/4"
C, D and E3 0" to 11" 0" to 11" 0" to 11" 0" to 11"
FCB43.5 Min.4 0" to 1" 0" to 1" 0" to 1" 0" to 1" 0" to 1"
Max.4 0" to 1" 0" to 1" 0" to 1" 0" to 1" 0" to 1"
FCB45.5 Min.4 0" to 1 1/2" 0" to 1 1/2" 0" to 1 1/2" 0" to 1 1/2"
Max.4 0" to 1 1/2" 0" to 1 1/2" 0" to 1 1/2" 0" to 1 1/2"
FCB47.5 Min.4 1 1/2" to 3 1/2" 0" to 3 1/2" 0" to 3 1/2" 0" to 3 1/2"
Max.4 0" to 1" 0" to 1" 0" to 1"
FCB49.5 Min.4 3 1/2" to 5 1/2" 1 1/2" to 5 1/2" 0" to 5 1/2" 0" to 5 1/2"
Max.4 0" to 1" 0" to 1"
FCB411.5 Min.4 5 1/2" to 7 1/2" 3 1/2" to 7 1/2" 1 1/2" to 7 1/2" 0" to 7 1/2"
Max.4 0" to 1"
  1. The stand-off is the distance from the interior flange of the stud to the face of the supporting structure (see illustration below).
    All dimensions assume fasteners are installed a minimum of 1/2" from the edge of stud, and the connector does not extend
    beyond the exterior flange of the stud; “—” designates conditions where fastener pattern will not fit on stud.
  2. A tabulated maximum stand-off of 12 1/4" is based on three anchors. For two anchors, maximum stand-off is 13 1/4".
  3. A tabulated maximum stand-off of 11" is based on three anchors. For two anchors, maximum stand-off is 12".
  4. For FCB fixed connectors (pp. 47–49), minimum indicates fill all round holes, and maximum indicates fill all round and triangle holes.
  5. Fastener patterns are as follows:
Stand-Off Distance
Stand-Off Distance
Pattern A - Two screws installed with one in each slot
Pattern A
Two screws installed with one in each slot
Pattern B - Two screws installed in slots farthest from the anchor leg
Pattern B
Two screws installed in slots farthest from the anchor leg
Pattern C - Two screws installed in slots closest to the anchor leg
Pattern C
Two screws installed in slots closest to the anchor leg
Pattern D - Two screws installed in outer slots with center slot empty
Pattern D
Two screws installed in outer slots with center slot empty
Pattern E - Three screws
Pattern E
Three screws