The bolts which are used with collars.12.9 Bolt Shear Capacity 12.9 Bolts. Load limits are based on a safety factor of 5 to 1.Related Resources: calculators Lag Screws in Wood Pullout Resistance Force Formulae and CalculatorThese bolts from ITA Fasteners are fully threaded and will come with a collar or shoulder depending on your requirements. If an angular lift is required, a properly seated shoulder pattern machinery eye bolt must be used. Standard forged eye bolts should not be used with angular lifts. Important: Working load limits for eye bolts are based on a straight vertical lift in a gradually increasing manner.
The length of the threaded part varies with the length of the screw and ranges from 19.0 mm (3/4 in.) with the 25.4- and 31.8-mm (1- and 1-1/4-in.) screws to half the length for all lengths greater than 254 mm (10 in.). Commonly available lag screws range from about 5.1 to 25.4 mm (0.2 to 1 in.) in diameter and from 25.4 to 406 mm (1 to 16 in.) in length. Anchor bodies are made of plated carbon steel, hot-dipped.Beam Deflections, Stress Analysis and EngineeringLag Screws in Wood Pullout Withdraw Resistance Force Formulae and CalculatorLag screws are commonly used because of their convenience, particularly where it would be difficult to fasten a bolt or where a nut on the surface would be objectionable. The minimum tensile strength of a 12.9 bolt is 1220 MPa.Trubolt Wedge anchors feature a stainless steel expansion clip, threaded stud body, nut and washer. Known for their high tensile strength, they are built with both hex and Torx heads and are available in zinc or chrome finishes.
Penetration of the threaded part to a distance about seven times the shank diameter in the denser species (specific gravity greater than 0.61) and 10 to 12 times the shank diameter in the less dense species (specific gravity less than 0.42) will develop approximately the ultimate tensile strength of the lag screw. The smaller percentage in each range applies to lag screws of the smaller diameters and the larger lubricants should be used on the screw to facilitate turning, and lead holes slightly larger than those recommended for maximum efficiency should be used with long screws.In determining the withdrawal resistance, the allowable tensile strength of the lag screw at the net (root) section should not be exceeded. The diameter of the lead hole for the threaded part varies with the density of the wood:Made by lag screw turned into a lead hole of properSize, and B, rough, shallow penetration of threadMade by lag screw turned into oversized lead hole.For low-density softwoods, such as the cedars and white pines, 40% to 70% of the shank diameter for Douglas-fir and Southern Pine, 60% to 75% and for dense hardwoods, such as oaks, 65% to 85%. The lead hole for the shank should be the same diameter as the shank. (The NDS and LRFD use ovendry weight and volume as a basis.)Lag screws, like wood screws, require prebored holes of the proper size. The following equations for withdrawal and lateral loads are based on lag screws having a base metal average tensile yield strength of about 310.3 MPa (45,000 lb/in 2) and an average ultimate tensile strength of 530.9 MPa (77,000 lb/in 2).Preview Lag Screws in Wood Pullout Withdraw Resistance Force CalculatorThe maximum direct withdrawal load of lag screws from the side grain of seasoned wood is given by:P = 125.4 G 3/2 D 3/4 L (Metric SI Units)G = Specific gravity of the wood based on ovendry weight and volume at 12% moisture content,L = Length (mm, in.) of penetration of the threaded part.
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Screw Eye Bolt Weight Calculator Professional Comments Are
National design specification for wood construction. There is a feedback form available and any and all professional comments are welcome. Engineers Edge is an engineering and design consulting, training and publishing firm and does not provide extended support to our general web site visitors. Density of Wood Equation and CalculatorWe think it's great that you're here on Engineers Edge, but know that this technical data is written for engineers and designers. Wood Engineering Properties (Specific Gravity) #3 Engineering Properties
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