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The calculated strength properties for coarse pitch thread bolts may be used conservatively for fine pitch thread bolts. By approximately ignoring the corner rounding for a perfect hexagon the relation of the distance across points s' and the distance across flats s is s' = s / cos(30°) = 1. For this case elastic linear distribution of internal forces should be used as specified in EN1993-1-8 §3.
Therefore for countersunk bolts the calculated tension resistance F t,Rd should be reduced by a factor of 0.is only valid when the bolt is used in holes with nominal clearance not exceeding the values given in the standard EN 1090-2 'Requirements for the execution of steel structures', as specified in EN1993-1-8 §3. In general the stress area of fine pitch thread bolts passing through the threaded part is larger as compared to the coarse pitch thread bolts. M14 bzp hexagon head bolts are manufactured from steel and have a diameter of 14 mm, conform to DIN 931 spec, and have a partial thread.
for long joints where the distance between the centers of the end fasteners measured in the direction of load transfer is more than 15 d the design shear resistance F v,Rd of all the fasteners should be multiplied by the reduction factor β Lf specified in EN1993-1-8 equation 3. that due to the nature of the surface finish on Unbrako products, some surface corrosion may be evident. A popular nut type, with a more unusual Fine Thread Pitch for when more thread engagement is required.
Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose.
The punching resistance of the bolt B p,Rd should be verified against the applied tensile load F t,Ed in accordance with EN1993-1-8 Table 3. The resulting hole diameter d 0 for each type of hole (normal, oversize, short slotted, long slotted) is determined by adding the nominal clearance given in EN 1090-2 Table 11 to the nominal diameter d of the bolt. The difference between a hex set bolt and a standard hex bolt is that hex bolts tend to have a shaft, whereas a hex set bolts do not. TheseM14 bolts are used to fasten two or more layers of metal together and are available in pack sizes of 25 and 50. The standarized properties of metric bolts are specified in the international standard ISO 898-1:2009 'Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread'.
Otherwise the design resistance of a group of fasteners should be taken as the number of fasteners multiplied by the smallest design resistance of any of the individual fasteners as specified in EN1993-1-8 § 3.
In addition for countersunk bolts the bearing resistance F b,Rd should be based on a plate thickness t equal to the depth of the connected plate minus half the depth of the countersinking. Our DIN 933 M14 hex sets in A2 stainless steel and bright zinc plated (BZP) steel are ideal for a range of applications, including construction, repairs, and maintenance.The bearing resistance of the bolt F b,Rd should be verified against the applied shear load F v,Ed in accordance with EN1993-1-8 Table 3. the bearing resistance F b,Rd for bolts in holes other than normal should be multiplied by the following reduction factors: Oversized holes = 0. The tensile stress area A s corresponds to the reduced cross-sectional area inside the threaded part of the bolt.
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