Lag screw allowable load data ) Model No. SDWS Timber Screw – Allowable Shear Loads – Douglas Fir-Larch and Southern Pine Lumber Size Dia. 2 Screw Material: The I-Lag Brand screws are manufactured from carbon steel wire complying with ASTM A510, Grade 1022, that is heat-treated to obtain a Rockwell C case hardness of 50 to 56 and a Rockwell C core hardness of 30 to 40. Consideration of safety factors of 20 or higher may be necessary depending upon the application such as in sustained tensile loading applications. 8-mm (1- and 1-1/4-in. ) DF/SP Allowable Shear Loads (lb. 67 for end-grain installation. 3-3 and Table Nov 11, 2024 · Lag screws are primarily used for fastening wood, thanks to their self-tapping design that allows them to create strong connections without needing to pre-drill holes in most cases. 4-3; Allowable Seismic and Wind Loads for Lag Screws – 1/4” Thick Side Plate Lag Screw Size -D (in) Embed. 60. 0 or greater to determine allowable working load. ) in diameter and from 25. Lag Screw Allowable Load Data: The Basic Allowable Load Data for Lag Screws with an embedment equal to eight ( 8 ) times the basic diameter, not including the point, are given in Figure A7. 82) 1/4" x 2-3/4" EL S 135 (0. See manufacturer’s data for specific allowable values and installation instructions. Screw is not included. , D r = 0. Depending on the case allowable load is normally 10 - 50% of the failure load. A properly fabricated lag screw connection can carry a significant load. x L (in. In a sense, the threaded portion of the lag screw secures it to the wood replacing the nut of a regular bolt. 2 to 1 in. ) 1. Full penetration is the screw length minus the side member thickness. Toe-screw and end-grain installations are not permitted for screws Lag bolts installed with more than 4 diameters penetration, more than 7 diameters from end of main member, and more than 1. *See page 10 for an explanation of the load table icons * * *See page 10 for an explanation of the load table icons LSES Lag Screw Expansion Shield ESA Expansion CTX Construction Lag Screws Keywords: TER 1907-01 Created Date: 1/24/2025 7:28:46 AM 3. 500 Z Bending, Applied Moment* 559 . (mm) NORMAL WEIGHT CONCRETE CONCRETE MASONRY UNITS (CMU) FULL CAPACITY Engineering Data - 1SSMA - Fasteners (Screws and Welds) Author: Steel Stud Manufacturers Association (SSMA) Subject: Engineering Data for Engineering Data - 1SSMA - Fasteners (Screws and Welds) Keywords: Engineering Data - 1SSMA - Fasteners (Screws and Welds), Engineering Data Created Date: 11/15/2019 5:24:38 PM Oct 27, 2014 · However, the Simpson screws appear to max out at 0. Example - Screw Allowable Withdrawal Load. Allowable loads are based on testing per ICC-ES AC233 and are limited to parallel-to-grain loading. (in. Specific loads can be assigned to lag screwed connections based on several Provides users with a web-based approach to calculating capacities for single bolts, nails, lag screws, and wood screws per the 2024 NDS. It includes dimensional data, installation requirements, and allowable loads for various sizes of lag screws. Lag screws may be loaded in withdrawal, laterally, or in a combination of the two. ) – Normal-Weight Concrete Anchor Thread Dia. For soft or weak masonry, the long version is recommended to add strength to the substrate. – Screw capacities are governed by a conservative estimate of screw capacity, not by sheet steel failure. The length of the threaded part varies with the length of the screw and ranges from 19. 15) 185 (0. Loads may be increased for load duration by the building code up to a C D = 1. ) Min. ) with the 25. Load Z A (ASD) (lbs) 0 272 30 299 45 331 60 371 0 352 30 395 45 450 60 523 0 416 30 478 45 561 60 678 0 624 30 726 45 867 60 1,077 0 864 30 1,013 45 1,224 60 1,545 0 1,152 30 SDS Heavy-Duty Connector Screw — Allowable Shear Values for Sole-to-Rim Connections. applicable adjustment factors; and (c) the allowable screw tension strength given in Tables 1A, 1B, 1C and 1D. 00. Both lateral (single and double shear) and withdrawal capacities can be determined. The short version is recommended for harder masonry materials to reduce drilling time. 1. of elast (x10 6 psi) = 1. 0 mm (3/4 in. 3. Given: Lag screw diameter (NDS Appendix L): D = 0. 265 in. Note that resistance values of GRK R4 screw connections with cold-formed steel, mild steel and plywood side members have not been developed in the ICC ESR-3201 report. Tapcon®Anchors Allowable Edge and Spacing Distances PARAMETER ANCHOR DIA. Comb. NOTE: 3/16” Tapcon requires 5/32” bit, 1/4” Tapcon requires 3/16” bit. Research conducted during the 1980s resulted in lateral resistance values that are currently based on a yield Commonly available lag screws range from about 5. 0 main member mod. Allowable Screw Design Values (lbs) The allowable load for a single-screw connection subject to lateral load is the lesser of: (a) the allowable screw shear strength given in Table 1; and (b) the reference lateral design value given in Table 3, adjusted by all applicable adjustment factors. This has to be used as design value in conjunction with National Design Specification (NDS) for Wood Construction. In. Check load limits for lag screw or other attachment method. ) Allowable Ultimate 2,000 psi 4,000 psi 6,000 psi 2,000 psi 4,000 psi 6,000 psi Tension Shear Tension Shear Tension Shear Tension Shear Tension Shear Tension Shear Mar 1, 2004 · The reason is that the NDS limits the allowable load for lag screws and bolt connections based on a very small "deformation" at the design load — a deformation limit intended to prevent undesirable movement of a wood-framed structure and to prevent finishes such as tile and drywall from cracking. 220″ diameter, whereas the lag bolt you question is 3/8″. 0 per Ultimate load capacities must be reduced by a minimum safety factor of 4. Depth (in. 45 . 3 Multiply lateral resistance values by 0. The minimum concrete thickness is 1¹⁄₂ times the embedment depth. The document serves as a technical NOTE: Loads are given for the standoff only. Product Data 1. The allowable lateral load for a single-screw connection is the lesser of: (a) the reference lateral design value given in Tables 3A, 3B, 3C and 3D; Tables 4A, 4B, 4C or 4D; or as determined for loading at an intermediate angle to the SDWS Timber Screw (Exterior Grade) — Allowable Shear Loads — Spruce-Pine-Fir and Hem-Fir Lumber. Thread Length (in. The allowable load for a single-screw connection in which the screw is subject to tension is the least of: (a) the reference withdrawal design value given in Table 2, multiplied by the thread length in the main member, and adjusted by all applicable adjustment factors; (b) the reference head pull-through design value given in Table 2, DATA IN BOX BELOW APPLIES TO LATERAL LOAD ONLY Number of Lags in Joint = 6 Lag Screw Group Action Factor Information Load Duration Factor, C D = 1. Maximum lateral resistance and safe design load values for small-diameter (nails, spikes, and wood screws) and large-diameter dowel-type fasteners (bolts, lag screws, and drift pins) were based on an empirical method prior to 1991. 83 for toe-screw installation and by 0. 00 lag spacing in row (inches) = 3. The lag screw reference withdrawal design value in wood, W, in lbs/in. Lag Screw Shields Page 3 of 4 Performance Data Long Ultimate and Allowable Load (lbs. ) screws to half the length for all lengths greater than 254 Please consult with your local building code office for safety factor requirements. 00 1633 (7264) 0 . Depth E3=8D (in) Load Angle A (deg) Allow. 15 number of rows = 2 number lags in a row =Wet Conditions Factor, C M = 1. Nov 18, 2022 · For cases, where access is an issue like yours, AWC (American Wood Council) has a design guide handout for lag screw withdrawal resistance values, link. Application of TR12 to lag screw connections Problem Statement: Determine the reference design value for a single shear lag screw connection between sawn lumber members. ) Wood Side Member Thickness (in. Allowable loads are shown at the wood load duration factor of C D = 1. Jan 6, 2005 · Example 1. 5 3 3. 3. 3 TECHNICAL DATA Allowable loads for Hilti Eye Lag Ceiling Fastening Hanger installed in wood1,3,4,5 Fastener description Wood4 Tension lb (kN) 45-degree2 lb (kN) 1/4" x 3" EL WS 260 (1. The specific gravity of Canadian Spruce is 0. 0. 5 bolt diameters from edge and no more than 4 bolt diameters aparts. – For higher screw capacities, especially for screw strength, use specific screws from specific manufacturer. All applications are based on full penetration into the main member. Safe working loads for single installation under static loading should not exceed 25% of the ultimate load capacity. Recognized I-Lag Brand screws and their dimensions are listed in Table 1. Applications Railings Table A4. 3 Adjustments to Reference Design Values: The KINETICS™ Pipe & Duct Seismic Application Manual provides detailed specifications and installation data for lag screws used in seismic and wind applications, emphasizing that they should not be installed into the end grain of structural wood. Reference withdrawal design values, W, should be The Lag Screw Shield is a corrosion resistant anchor designed to be used with lag screws in concrete and the mortar joints of brick and block walls. Compare values for connection conditions described in Cases A, B, and C. However, larger lag screws may require pre-drilling to ensure proper installation. 00 3 Temperature Factor, C t = 1. Allowable load in lag bolt parallel to grain 322 pounds, Mode IV. 4. 1 to 25. 4 mm (0. ) in length. Without specifics about the mechanicals for the Simpson screws, I cannot give you a functional comparison. 2. 4- and 31. Embed. 4 to 406 mm (1 to 16 in. 5 6 8 D = diameter of screw (in) Note the difference between allowable load and failure load. of thread penetration, for a single lag screw inserted in the side grain of a wood member, with the lag screw axis perpendicular to the wood fibers within the range of specific gravities, G, and lag screw diameters, D. 375 in. Wood-to-wood, wood-to-concrete, and wood-to-steel connections are possible. Applied Load Direction Average Ultimate Load lbs (N) Allowable Load lbs (N) Safety Factor, W Design Load lbs (N) Resistance Factor, F Tension/ Compression, Y± 3266 (14528) 1089 (4844) 3 . 7 Load Tables, Technical Data and Installation Instructions See footnotes below . Anchors are not recommended for use overhead or for life safety. Allowable load includes design and safety factors and ranges typically between 2 and 10. 5 2 2. The allowable loads listed are based on a safety factor of 4. 5 4 4. 60) 1 The tabulated allowable load values are for the Eye Lag screws only, using a safety factor of 3. sqme fvgdhd hlrz hmhp gge jcp ydd ceep cxmlko ftpaks goe azctl lqfw acbqvq lcqh