RECOMMENDED TENSILE PULLOUT DESIGN LOAD
| Self-Tapping Sheet Metal Screw Size | Thickness of Metal Stud | ||
| 20 ga. (0.940 mm) | 16 ga. (1.435 mm) | 14 ga. (1.727 mm) | |
| No. 8 | 430N (97 lbs) | 1,050N (237 lbs) | 1,395N (314 lbs) |
| No. 10 | 415N (93 lbs) | 1,045N (235 lbs) | 1,475N (332 lbs) |
| No. 12 | 600N (135 lbs) | 945N (212 lbs) | 1,430N (322 lbs) |
| No. 14 | 525N (118 lbs) | 1,060N (238 lbs) | 1,670N (376 lbs) |
Notes
- The above pullout design loads correspond to a factor of safety of 3.0 (as per Table 3 of CSA CAN3-A370-04
“Connectors for Masonry”, ACI/ASCE/TMS/518 and U.B.C.). Note (1) of Table 3 in A370 states “Where a single
tie secures less than 0.5 m of masonry, the factors of safety may be reduced to 75% of the tabulated value”
(i.e. 75% of 4.0 = 3.0).
- To arrive at the pullout design values, 5 screws of each size were tested with two studs (from different runs)
of each stud gauge. The actual thickness of each stud size was as follows: 20 gauge: 0.940 and 0.978 mm, 16
gauge: 1.435 and 1.511 mm and 14 gauge: 1.727 and 1.740 mm.
- The sheet metal screw physical properties are as follows:
| Screw Size | Thread Diameter | Shank Diameter | Threads per inch
(Threads per 25 mm) |
| No. 8 | 4.22 mm (0.166”) | 3.05 mm (0.120”) | 19 |
| No. 10 | 4.75 mm (0.187”) | 3.48 mm (0.137”) | 17 |
| No. 12 | 5.51 mm (0.217”) | 3.12 mm (0.123”) | 13 |
| No. 14 | 6.20 mm (0.244”) | 4.83 mm (0.190”) | 14 |
Recommended Tensile Pullout Design Load for FERO Tie Systems Compatible Fasteners
| Type of Fastener | CONCRETE BLOCK | 20.7 MPa Concrete (3000 psi) | |
| Light Weight (105 pcf ) | Normal Weight (150 pcf ) | ||
| U-Drive Anchor (Ucan) | 215N (48 lbs) | 960N (216 lbs) | 1,390N (312 lbs) |
| Tapcon (Ucan) (i) 3/16ӯ (ii) 1/4ӯ |
310N (69 lbs) 600N (135 lbs) |
575N (129 lbs) 1,080N (243 lbs) |
735N (165 lbs) 1,440N (324 lbs) |
| Ucan Confixx (i) No. 12 (ii) No. 14 |
360N (81 lbs) 640N (144 lbs) |
200N (45 lbs) 590N (132 lbs) |
1,190N (267 lbs) 1,390N (312 lbs) |
| Zamac Pin Bolt (Ucan) (i) 3/16ӯ (ii) 1/4ӯ |
630N (141 lbs) 975N (219 lbs) |
655N (147 lbs) 1,150N (258 lbs) |
1,040N (234 lbs) 1,215N (273 lbs) |
Notes
- The above pullout design loads correspond to a minimum embedment length of 32 mm
(1 1/4”) for all of the fasteners listed, with the exception of the 3/16”Ø Zamac Pin Bolt which
was tested with a 22 mm (7/8”) embedment length.See Ucan product literature for pullout
loads pertaining to other embedment lengths.
- The tabulated pullout design loads correspond to a Factor of Safety of 3.0 (as per Table 3
of CSA CAN3-A370-04 “Connectors for Masonry”, ACI/ASCE/TMS/518 and U.B.C.). Note (1)
of Table 3 in A370 states “Where a single tie secures less than 0.5 m2 of masonry, the factors
of safety may be reduced to 75% of the tabulated value”. (i.e. 75% of 4.0 = 3.0).
- Manufacturers guidelines must be followed for fastener application; i.e. recommended
edge distance, drill bit diameter, hole depth, type of drill, fastener installation, etc.
- The pullout design loads incorporated in the above table were either taken directly from
Ucan product literature or obtained from tests performed by Fero.
