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Excalibur Screwbolts

Updated: 01/07/12Excalibur Screwbolt Hexagon Head (HSB) 20mm
Suitable for Cracked and Uncracked Concrete

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FURTHER INFORMATION

For additional technical data please call the Sales Desk on
01702 206962 or 01702 207909

 
HSB 20mm   Options
Screwbolt Diameter Head Details and Diameter Clearance Hole Diameter Max Fixing Thickness 'A'
 Thread Length 'B'
 Clearance Depth 'C'
 Box Quantity Order code:
20mm 30mm Across Flats
Flange Diameter 40mm 		23.0mm 28mm 100mm 40mm 20 HSB 20 / 100
20mm 23.0mm 58mm 150mm 40mm 20 HSB 20 / 150
20mm 23.0mm 158mm 200mm 40mm 10 HSB 20 / 200
20mm 23.0mm 258mm 300mm 60mm 10 HSB 20 / 300
Drill Bit Diameter Concrete
 20.0mm
- -
HSB 20mm  TECHNICAL DATA
Finish Mechanical Zinc as standard
Other finishes Other platings & finishes are available to special order subject to quantity
Tensile strength 800N/mm2 Case hardened
Other sizes Other lengths of all diameters are available to special order subject to quantity
Embedment concrete and brick Minimum recommended is 4.5 × bolt diameter
Soft block Not recommended for soft block


Design Tables based on ETAG Approval (11/0259)


Table 1: Mean Ultimate resistance (Nru.m from test results)   
Anchor Size (mm) 16 16 20 20 20 20
Hef nominal (mm) 120 120 170 170 250 250
Non-Cracked Concrete C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile Nru,m  [kN] 44.30 74.60 82.90 121.75 206.40 223.56
Shear Vru,m  [kN] 94.00 94.00 155.40 155.40 155.40 155.40
 Cracked  Concrete   C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile Nru,m  [kN] 31.80 43.84 44.60 79.37 NT NT
Shear Vru,m  [kN] 94.00 94.00 155.40 155.40 NT NT


  Table 2: Characteristic resistance ( NRk = NRu.m (1-k5%V)   
Anchor Size (mm) 16 16 20 20 20 20
Hef nominal (mm) 120 120 170 170 250 250
Non-Cracked Concrete C20/25 C50/60 C20/25 C50/60 C20/25 C50/60
Tensile NRk  [kN] 32.30 54.30 40.60 92.77 143.70 171.18
Shear VRk  [kN] 91.70 91.70 139.50 139.50 139.50 139.50
Cracked  Concrete   C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile NRk  [kN] 19.90 21.48 26.40 38.89 NT NT
Shear VRk  [kN] 91.70 91.70 139.50 139.50 NT NT


  Table 3: Design Resistance (NRd = NRk/ym)
Anchor Size (mm) 16 16 20 20 20 20
Hef nominal (mm) 120 120 170 170 250 250
Non-Cracked Concrete C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile NRd  [kN] 17.90 30.16 22.60 51.53 79.90 95.10
Shear VRd  [kN] 73.30 73.30 111.60 111.60 111.60 111.60
Cracked  Concrete   C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile NRd  [kN] 9.95 10.74 13.20 19.45 NT NT
Shear VRd  [kN] 73.30 73.30 111.60 111.60 NT NT


  Table 4:  Recommended Load (Nrec = NRd/y)   
Anchor Size (mm) 16 16 20 20 20 20
Hef nominal (mm) 120 120 170 170 250 250
Non-Cracked Concrete C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile Nrec  [kN] 12.80  21.54 16.14 36.80 57.07 67.92
Shear Vrec  [kN] 52.40 52.40 79.70 79.70 79.70 79.70
Cracked  Concrete   C20/25 C50/60 C20/25 C50/60 C20/25 C50/60  
Tensile Nrec  [kN] 7.10 7.70 9.40 13.90 NT NT
Shear Vrec  [kN] 52.40 52.40 79.70 79.70 NT NT
NT = Not Tested
Revised October 6th 2014 (shear values extended)



Minimum thickness of concrete member, minimum spacing and minimum edge distance for cracked and non-cracked concrete (without reduction factors)        
Anchor size (mm) hnom 120mm hnom 170mm
16 20
Minimum thickness of member 165mm 220mm
Minimum edge distance 185mm 180mm
Minimum spacing 240mm 340mm  

Reduction Factors for Edge distances beween 5 x diameter and 10 x diameter   
Edge distance 80 100 120 140 160
M16 anchors in tension 0.70 0.78 0.87 0.96 1.00
M16 anchors in shear 0.32 0.52 0.71 0.90 1.00

Reduction Factors for Edge distances between 5 x diameter and 10 x diameter   
Edge distance 100 120 140 160 180 200
M20 anchors in tension 0.75 0.82 0.89 0.92 0.96 1.00  
M20 anchors in shear 0.32  0.52 0.71 0.80  0.90 1.00

Factors for Space reduction in Tension   
Space  (mm) 80 110 140  170 210 240  
M16 anchors 0.75 0.80 0.85 0.90 0.95 1.00 
Space  (mm) 100 150  200 250 300 340  
M20 anchors 0.70 0.76 0.82  0.88  0.94 1.00

Increasing factors for cracked and non-cracked concrete
  M16 M20  
C30/37 1.22 1.22  
C40/50 1.41 1.41
C50/60 1.55 1.55