BS EN 14566:2008 pdf free download – Mechanical fasteners for gypsum plasterboard systems一 Definitions, requirements and test methods.
5.2 Number of samples
Testing requires a representative quantity of samples proportionate to the delivery or consignment covering each type, length and profile. Certain test methods specify a minimum number of specimens and the quantity sampled shall be sufficient to enable all the tests to be carried out. When no specific number is indicated in the respective test methods, a minimum of 50 fasteners shall be tested.
NOTE Informative Annex B gives suggested methods for sampling.
5.3 Dimensional measurement
5.3.1 Principle
Diameter of shank, length, head thickness and diameter, where relevant, shall be measured.
5.3.2 Apparatus
a) micrometer permitting a reading to 0,01 mm;
b) vernier calliper permitting a reading to 0,1 mm.
5.3.3 Procedure
5.3.3.1 Diameter of shank
Measure the diameter of shank with the micrometer in three separate positions on a representative surface area
away from point or tip.
5.3.3.2 Length
Place the specimen in the vernier calliper and measure the overall length.
5.3.3.3 Head diameter or crown width
Place the head or the crown of the specimen in the micrometer and measure the head diameter or crown width.
5.3.3.4 Expression of results
Record the results to the nearest 0,1 mm. Compare the difference between each measured value and the nominal
value with the producer’s declared tolerance.
5.4 Determination of withdrawal force
5.4.1 Principle
The force to withdraw a fastener from a piece of timber or a metal section shall be measured.
5.4.2 Apparatus
a) testing device as shown in Figure 3;
b) calibrated loading machine, capable of applying a force of 1 000 N ± 10 N at a rate of (450 ± 200) N per mm;
c) metal section (0,60 ± 0,04) mm thick to EN 14195.
d) timber member 50 mm x 50 mm (fastener perpendicular to the grain) conforming to EN 338, class C 16 having (15 ± 3) % moisture content.
5.5.2 Apparatus
A three point loading static bend apparatus as described in EN ISO 12777-3 or equivalent.
5.5.3 Procedure
Clamp the fastener under test in the position required by the particular apparatus in use.
Slowly apply a force to produce a bend (100 and 15° for pointed and flat end screws, respectively, and 90° for nails and staples over a radius not greater than the diameter of the nail or staple) in the shank.
5.5.4 Expression of results
Record any breakage or signs of cracking visible with 10 x magnifying lens.
5.6 Drilling time test
5.6.1 Principle
The ability of the screw to penetrate a piece of galvanised steel under controlled force and speed is measured.
5.6.2 Apparatus
a) Phillips number 2 bit or to screw producer’s specification;
b) power screwdriver 300 w to 350 w, no load speed (2 350 ± 350) revolutions per mm;
c) fixed support mounting for the power screwdriver;
d) application force: Power screwdriver plus dead weight = 15 kg;
e) stop watch with pre-setting to start at the commencement of drilling and stop when screw penetrates to a depth of 10 mm. This fixed depth allows all lengths of screws to be tested;
f) cold rolled galvanised steel sheet (0,6 ± 0,04) mm manufactured to EN 10327 of a size large enough for 50 type N screws to be inserted without interference with one another.(See Table A.2).
g) cold rolled galvanised steel sheet (2 ± 0,09) mm manufactured to EN 10327 of a size large enough for 50 type D screws to be inserted without interference with one another. (See Table A.2).