Dimensions from most preferred sizes Dimensions (d) M16 M20 M24 M30 M36 b 116-122 120-127.5 124-133 130-140.5 136-148 ds 15.3-16.7 19.16-20.84 23.16-24.84 29.16-30.84 35-37 k (nom) 10 12.5 15 17.7 22.5 k 9.25-10.75 11.6-13.4 14.1-15.9 17.65-19.75 21.45-23.55 s 23.16-24 29.16-30 35-36 45-46 53.8-55 f (nom) 8 10 12 15 18 f 7.25-8.75 9.25-10.75 11.1-12.9 14.1-15.9 17.1-18.9 v 15.3-16.7 19.16-20.84 23.16-24.84 29.16-30.84 35-37 Tolerances on nominal length Nominal length (mm) Tolerance (mm) 250 < / <= 315 +/- 5.
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Currently, Holding Down Bolts doesn’t fall into Construction Product Regulation (CPR) standards and they cannot be CE (UKCA) Marked. Holding Down Bolts are manufactured per BS 7419 ](/standards/bs-7419-holding-bolts-basic-dimensions) (British Standard). This standard is not a harmonised standard like EN/ISO, which will allow them to be CE (UKCA) marked . More about this can be read in BCSA memorandum No 17-14**](/downloads/news/2014/Holding-Down-Bolts-and-CE-marking.pdf). In the new edition of EN 15048:2016 (after the standard will become harmonised), holding down bolts can be considered for CE (UKCA) marking after initial testing and suitability test following 5.
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Typical products offered from this group Product description Specification Square Square Bolts (SQ SQ), Holding Down Bolts , Foundation Bolts, SQ SQ Bolt Assemblies (complete with Nut, Plate and Wax Cone) BS 7419 Square Plate Washer (Square plate with square hole to fit SQ SQ Bolt under the head) to suit BS 7419 bolt Wax Cardboard Cones to suit BS 7419 bolt Bolt extenders , Universal Bolt Connectors (UBC), Universal Nut Connectors (UNC), Wedges to suit BS 7419 bolt Finishes available Finish Specification S/C
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Content with holding down bolts