Anchor Fastening Technical Guide , Edition 22
Table 6 — Load adjustment factors for 1 / 4-in . diameter Hilti KH-EZ , KH-EZ P , KH-EZ PM , KH-EZ PL and KH-EZ C in uncracked concrete 1 , 2
Edge distance in shear
1 / 4-in . KH-EZ uncracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 3
ƒ AV
⊥ toward edge
ƒ RV
II to and away from edge
ƒ RV
Conc . thickness factor in shear 4
ƒ HV
Embedment h nom in . 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 ( mm ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 )
Spacing ( s )/ edge distance ( c a
)/ concrete thickness ( h ) - in . ( mm )
1-1 / 2 ( 38 ) 0.71 0.63 0.78 0.65 0.59 0.56 0.40 0.21 0.78 0.42 n / a n / a 2 ( 51 ) 0.78 0.67 1.00 0.77 0.62 0.58 0.61 0.33 1.00 0.65 n / a n / a
2-1 / 2 ( 64 ) 0.85 0.72 0.90 0.65 0.60 0.86 0.46 0.90 n / a n / a
3 ( 76 ) 0.92 0.76 1.00 0.68 0.62 1.00 0.60 1.00 n / a n / a 3-1 / 4 ( 83 ) 0.96 0.78 0.70 0.63 0.68 0.88 n / a 3-1 / 2 ( 89 ) 0.99 0.80 0.71 0.64 0.76 0.92 n / a
4 ( 102 ) 1.00 0.85 0.74 0.66 0.92 0.98 n / a 4-1 / 8 ( 105 ) 0.86 0.75 0.66 0.97 1.00 0.81 4-1 / 2 ( 114 ) 0.89 0.77 0.68 1.00 0.84
5 ( 127 ) 0.93 0.80 0.70 0.89
5-1 / 2 ( 140 ) 0.98 0.83 0.72 0.93 6 ( 152 ) 1.00 0.86 0.74 0.97 7 ( 178 ) 0.92 0.78 1.00 8 ( 203 ) 0.98 0.82 9 ( 229 ) 1.00 0.86 10 ( 254 ) 0.89 11 ( 279 ) 0.93 12 ( 305 ) 0.97 14 ( 356 ) 1.00
3.3.6
Table 7 — Load adjustment factors for 1 / 4-in . diameter Hilti KH-EZ , KH-EZ P , KH-EZ PM , KH-EZ PL and KH-EZ C in cracked concrete 1 , 2
1 / 4-in . KH-EZ cracked concrete
Spacing factor in tension
ƒ AN
Edge distance factor in tension
ƒ RN
Spacing factor in shear 3
ƒ AV
Edge distance in shear
⊥ toward edge
ƒ RV
II to and away from edge
ƒ RV
Conc . thickness factor in shear 4
ƒ HV
Embedment h nom in . 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 1-5 / 8 2-1 / 2 ( mm ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 ) ( 41 ) ( 64 )
Spacing ( s )/ edge distance ( c a
)/ concrete thickness ( h ) - in . ( mm )
1-1 / 2 ( 38 ) 0.71 0.63 0.88 0.65 0.59 0.56 0.40 0.21 0.80 0.43 n / a n / a 2 ( 51 ) 0.78 0.67 1.00 0.77 0.62 0.58 0.62 0.33 1.00 0.66 n / a n / a
2-1 / 2 ( 64 ) 0.85 0.72 0.90 0.65 0.60 0.87 0.46 0.90 n / a n / a
3 ( 76 ) 0.92 0.76 1.00 0.68 0.62 1.00 0.60 1.00 n / a n / a 3-1 / 4 ( 83 ) 0.96 0.78 0.70 0.63 0.68 0.89 n / a 3-1 / 2 ( 89 ) 0.99 0.80 0.71 0.64 0.76 0.92 n / a
4 ( 102 ) 1.00 0.85 0.74 0.66 0.93 0.98 n / a 4-1 / 8 ( 105 ) 0.86 0.75 0.66 0.97 1.00 0.81 4-1 / 2 ( 114 ) 0.89 0.77 0.68 1.00 0.85
5 ( 127 ) 0.93 0.80 0.70 0.89
5-1 / 2 ( 140 ) 0.98 0.83 0.72 0.93 6 ( 152 ) 1.00 0.86 0.74 0.98 7 ( 178 ) 0.92 0.78 1.00 8 ( 203 ) 0.98 0.82 9 ( 229 ) 1.00 0.86 10 ( 254 ) 0.90 11 ( 279 ) 0.94 12 ( 305 ) 0.98 14 ( 356 ) 1.00
1 Linear interpolation not permitted .
2 When combining multiple load adjustment factors ( e . g . for a 4 anchor pattern in a corner with thin concrete member ) the design can become very conservative . To optimize the design , use Hilti PROFIS Engineering software or perform anchor calculation using design equations from ACI 318 Chapter 17 .
3 Spacing factor reduction in shear , ƒ AV , assumes an influence of a nearby edge . If no edge exists , then ƒ AV
= ƒ AN .
4 Concrete thickness reduction factor in shear , ƒ HV , assumes an influence of a nearby edge . If no edge exists , then ƒ HV
= 1.0 .
If a reduction factor value is in a shaded cell , this indicates that this specific edge distance may not be permitted with a certain spacing ( or vice versa ). Check with table 5 and figure 2 of this section to calculate permissable edge distance , spacing and concrete thickness combinations .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.6 KWIK HUS-EZ SCREW ANCHOR Hilti , Inc . 1-800-879-8000 | en español 1-800-879-5000 | www . hilti . com | Hilti ( Canada ) Corporation | www . hilti . ca | 1-800-363-4458
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