Table 13 — Hilti KWIK HUS-EZ I and KWIK HUS-EZ E carbon steel screw anchor factored resistance with concrete / pullout failure in uncracked concrete 1 , 2 , 3 , 4 , 5
Nominal anchor diameter in .
1 / 4
3 / 8
Effective embed . in . ( mm )
Nominal embed . in . ( mm )
Effectiveness Factor
Strength Reduction Factor Tension
Concrete material resistance factor
Pullout Strength ( 2500 psi concrete ) ƒ ' c
= 20 MPa ( 2,900 psi ) lb ( kN )
Tension - N r ƒ ' c
= 25 MPa ( 3,625 psi ) lb ( kN ) ƒ ' c
= 30 MPa ( 4,350 psi ) lb ( kN ) ƒ ' c
= 40 MPa ( 5,800 psi ) lb ( kN ) ƒ ' c
= 20 MPa ( 2,900 psi ) lb ( kN ) ƒ ' c
= 25 MPa ( 3,625 psi ) lb ( kN )
Shear - V r ƒ ' c
= 30 MPa ( 4,350 psi ) lb ( kN ) ƒ ' c
= 40 MPa ( 5,800 psi ) lb ( kN )
1.18 1-5 / 8 1305 665 710 750 820 805 900 985 1,135
10 0.75 0.65 ( 30 ) ( 41 ) ( 5.8 ) ( 3.0 ) ( 3.2 ) ( 3.3 ) ( 3.6 ) ( 3.6 ) ( 4.0 ) ( 4.4 ) ( 5.1 )
1.92 2-1 / 2 2350 1,645 1,840 2,015 2,325 2,225 2,490 2,725 3,145
10 1 0.65 ( 49 ) ( 64 ) ( 10.5 ) ( 7.3 ) ( 8.2 ) ( 9.0 ) ( 10.3 ) ( 9.9 ) ( 11.1 ) ( 12.1 ) ( 14.0 )
1.54 2-1 / 8 1,595 1,785 1,955 2,260 1,595 1,785 1,955 2,260
10 1 0.65 N / A ( 39 ) ( 54 ) ( 7.1 ) ( 7.9 ) ( 8.7 ) ( 10.0 ) ( 7.1 ) ( 7.9 ) ( 8.7 ) ( 10.0 )
Table 14 — Hilti KWIK HUS-EZ I and KWIK HUS-EZ E carbon steel screw anchor factored resistance with concrete / pullout failure in cracked concrete 1 , 2 , 3 , 4 , 5
Nominal anchor diameter in .
d a in ( mm )
1 / 4
3 / 8
Effective embed . in . ( mm )
h ef
( mm )
Nominal embed . in . ( mm )
h nom
( mm )
Effectiveness Factor
Strength Reduction Factor Tension
Concrete material resistance factor
Pullout Strength ( 2500 psi concrete ) k cr
R Ф c
N p , uncr
( N / mm 2 ) ƒ ' c
= 20 MPa ( 2,900 psi ) lb ( kN )
Tension - N r ƒ ' c
= 25 MPa ( 3,625 psi ) lb ( kN ) ƒ ' c
= 30 MPa ( 4,350 psi ) lb ( kN ) ƒ ' c
= 40 MPa ( 5,800 psi ) lb ( kN ) ƒ ' c
= 20 MPa ( 2,900 psi ) lb ( kN ) ƒ ' c
= 25 MPa ( 3,625 psi ) lb ( kN )
Shear - V r ƒ ' c
= 30 MPa ( 4,350 psi ) lb ( kN ) ƒ ' c
= 40 MPa ( 5,800 psi ) lb ( kN )
20 25 30 40 20 25 30 40
1.18 1-5 / 8 665 340 360 385 415 565 630 690 795
7 0.75 0.65 ( 30 ) ( 41 ) ( 3.0 ) ( 1.5 ) ( 1.6 ) ( 1.7 ) ( 1.9 ) ( 2.5 ) ( 2.8 ) ( 3.1 ) ( 3.5 )
1.92 2-1 / 2 1165 815 910 1,000 1,155 1,800 1,740 1,910 2,205
7 1 0.65 ( 49 ) ( 64 ) ( 5.2 ) ( 3.6 ) ( 4.1 ) ( 4.4 ) ( 5.1 ) ( 8.0 ) ( 7.7 ) ( 8.5 ) ( 9.8 )
1.54 2-1 / 8 1,120 1,250 1,370 1,580 1,120 1,250 1,370 1,580
7 1 0.65 N / A ( 39 ) ( 54 ) ( 5.0 ) ( 5.6 ) ( 6.1 ) ( 7.0 ) ( 5.0 ) ( 5.6 ) ( 6.1 ) ( 7.0 )
1 See section 3.1.8 to convert design strength value to ASD value . 2 Linear interpolation between embedment depths and concrete compressive strengths is not permitted .
3 Apply spacing , edge distance , and concrete thickness factors in tables 5 to 6 as necessary . Compare to the steel values in table 9 . The lesser of the values is to be used for the design .
4 Tabular values are for normal weight concrete only . For lightweight concrete multiply design strength by λ a as follows : for sand-lightweight , λ a = 0.68 ; for all-lightweight , λ a
= 0.60
5 5 Tabular values are for static loads only . Seismic design is not permitted for uncracked concrete . For seismic tension loads , multiply cracked concrete tabular values in tension by the following reduction factors :
1 / 4-in diameter by 1-5 / 8-in nominal embedment depth - α N , seis = 0.60
1 / 4-in diameter by 2-1 / 2-in nominal embedment depth - α N , seis
= 0.75 . No reduction needed for seismic shear . See section 3.1.8 for additional information on seismic applications .
3.3.8
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.3.8 KWIK HUS-EZ I AND KWIK HUS-EZ E CARBON STEEL 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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