3.2 Material: The screws are formed from steel wire complying with the manufacturer’s specifications. (kN) SHEAR Lbs. For screws located at least 2" but less than 6" from the end, use 50% of the load per screw and 50% of the table spacing between the end screw and the adjacent screw, and for screws located between 2" and 4" from the end, predrill using a 5/32" drill. This load (250plf) must be supported at Ledger 10 ft. 5 ft. Such screwed joints are normally designed as single shear joints. Deck Dead Load = 10 psf Table 3 (wet-use in- service) RSS 5/16 x 4" Joist span 6 ft 8 ft 10 ft 12 ft 14 ft Live load (psf) Wood Species Screw Shear Capacity Screw Spacing in inches/ wet-use in- service 40 G= 0.42 / SPF 127 10 7 6 5 4 40 G = 0.50 / DF-PSL-LVL-LSV 150 12 9 … If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. FastenMaster LOK wood screws are structural construction fasteners that require no predrilling, replace lag screws, replace through bolts, replace carriage bolts and replace nails in wood-to-wood applications. Features. 2. Over 7,000 quality products across all essential categories: Screws, Fasteners & Fixings, Nails, Adhesives & Building Chemicals, Powertool Accessories & Hand Tools, Building Hardware & … Shear stress is measured in psi. The shear capacity given in the tables must be reduced for large packings, large grip lengths, … Total withdrawal load is based on actual thread penetration into the main member. Fig 2 LENGTHS Wood screw typically range from 1/4" to 6" in length. View product. For example, a 20d (20 penny) common nail (0.192" diameter) has a withdrawal load design value of 42 lbs./in. of penetration in the side grain of wood having a specific gravity of 0.48 (such as Douglas Fir, South). (3) Oct/2015 Connections for Side-Loaded Beams Intro: GRK’s Joist and Truss Screw is the ideal fastener for heavy duty roof and floor construction. Internal drive screws with a slot and currently and far more commonly a Pozi® or Phillips® drive. In comparison, a #10 wood screw (0.190" diameter) has a withdrawal design value of 124 lbs./in. tapered hole too deep may compromise the screw's withdrawal load by reducing thread engagement in the wood. INC VAT EX VAT. Will produce a mating thread when assembled into wood or other resilient materials. If proof load isn’t specified in the above tables, we use 85% of yield; It is assumed that the joint is twice as stiff as the bolt, which implies that 1/3 of the external load is seen by the bolt, and the other 2/3 goes into reducing clamping load. Capacity Table For 95% Loaded Conveyors Screw Dia. Wood Screws 8–10 Withdrawal Resistance 8–10 Lateral Resistance 8–11 Lag Screws 8–12 Withdrawal Resistance 8–12 Lateral Resistance 8–13 Bolts 8–14 Bearing Stress of Wood under Bolts 8–14 Loads at an Angle to the Grain 8–15 Steel Side Plates 8–15 Bolt Quality 8–15 Effect of Member Thickness 8–16 Two Member, Multiple Member Joints 8–16 Loads may be increased for load duration up to a CD = 1.60. 2/3 of the nominal screw length. If proof load isn’t specified in the above tables, we use 85% of yield; It is assumed that the joint is twice as stiff as the bolt, which implies that 1/3 of the external load is seen by the bolt, and the other 2/3 goes into reducing clamping load. For example, a 20d (20 penny) common nail (0.192" diameter) has a withdrawal load design value of 42 lbs./in. Shank Diameter* Root Diameter* Maximum Head Diameter: Threads Per Inch: Nearest Fractional Measurement: Decimal Measurement: Nearest Fractional Measurement: Decimal Measurement: 0: 1 / 16 Other Screws. The large washer head gives high head pull-through resistance while allowing the timber members to close up firmly. Elongation due to axial load Calculator: Calculates elongation (as well as stress and strain) for prismatic elements subject to axial force. The drilling point and lead threads are heat-treated to a minimum through-hardness of 55 HRC. Most shelves will have both types of loads, but the design of the shelf will help determine the type of load. 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. CE marked to EN14592. Wood Screws. Tabulated values assume two sheets of equal thickness are connected. F = 2850 SG2 D (1) where. Multiple Sawn Lumber & Engineered Wood Beams Tel: (800) 263-0463 grk@grkfasteners.com Fax: (800) 895-5160 www.grkfasteners.com GRK/TB-MB Rev. Please read AddThis Privacy for more information. Density is weight per unit volume. Round Head screws can be 5% to 10% smaller. Rolled thread screws: At least 4X the basic screw diameter or 2/3 the nominal screw length (whichever is greater). The withdrawal force per inch of penetration can be estimated as. Max. Allowable withdrawal load for DFL/SP/SCL is 172 lb./in. Wood screw threads are tapered to a sharp point; screw development has introduced points that reduce the potential for splitting the wood and allow assembly without a drilled pilot hole. Screws are inserted by turning and this can be done either by hand or by power actuated tool depending on the situation. Allowable loads are shown at the wood load duration factor of CD = 1.00. ESCR is a washer head structural screw designed for load-bearing timber structures. 2.2 Screws Wood screws are especially suitable for steel-to-timber and panel to timber joints, but they can also be used for timber-to-timber joints. When loads are borne perpendicular to the grain of the wood, the load bearing capacity of the wood is at its least. Screw Dia. Allowable withdrawal load for DF/SP/SCL is 172 lb./in. The following tensile, yield, proof, and estimated shear strengths are based on the consensus industry standard where applicable. Table 1 provides screw descriptions (size, tpi, length), nominal diameters, head style, head diameters, point style, drilling capacities and length of load-bearing area. Tapcon Screw Anchor - Technical Data Ultimate Tension and Shear Values (Lbs/kN) in Concrete Tapcon® Anchors PERFORMANCE TABLE ANCHOR DIA. Everyday items like eyeglasses and laptops rely on custom screws and micro fasteners to hold the parts in place, but a larger, high weight-capacity screw can also compromise the construction of these items. Wood Screw Size Chart With thanks to Boltdepot.com. Ultimate Load - A load that during a controlled test, produced complete failure of the fastener. These applications will - due to browser restrictions - send data between your browser and our server. Cabinet Levelers. DEPTH OF EMBEDMENT In. Staples and Nails for Air Tools. End screws shall be located 6" from the end and at 1 1/2" to 2" from the bottom of the ledger. of penetration of the nail in the member holding the nail point, See table 3 for recommended driver bit sizes. Hook and Loop Fastener. The threaded portion of the screw with the lower hardness is considered the load-bearing area, used to transfer loads between connected elements. NOTE: 1. In the table, As has been taken as equal to At . Wood tension element capacity Calculator: Calculates capacity of a wood tension element based on allowable tension on net area (reduced by bolt holes) and, if desired, row and group tear-out. Methods presented in this section may be used to calculate uniform load capacity of structural-use panels in floor, roof and wall applications. leverage action of a shelf pulling the screw out of the wall). Conversely, when it comes to micro screws or smaller loads, it doesn’t make sense to overestimate the load and rely on a large, heavy duty screw. Resources Referenced AF&PA Wood Frame Construction Manual Code compliant prescriptive method Same authors as NDS Critical Wood Properties Species / Specific Gravity Moisture Content Loading … (See Figure 2.) CE marked to EN14592. The Design Capacity Tables for Timber (DCTT) is a design aid for structural engineers. Copyright © 2020 TIMCO. Salt Spray Test - A common testing method to determine the corrosion resistance of plating and finishes. Wood-to-wood, wood-to-concrete, and wood-to-steel connections are possible. The difference is not as apparent in the larger gages and lengths because the taper is not as significant. Deck Dead Load = 10 psf Table 3 (wet-use in- service) RSS 5/16 x 4" Joist span 6 ft 8 ft 10 ft 12 ft 14 ft Live load (psf) Wood Species Screw Shear Capacity Screw Spacing in inches/ wet-use in- service 40 G= 0.42 / SPF 127 10 7 6 5 4 40 G = 0.50 / DF-PSL-LVL-LSV 150 12 9 … Both lateral (single and double shear) and withdrawal capacities can be determined. Biscuits . Wood tension element capacity Calculator: Calculates capacity of a wood tension element based on allowable tension on net area (reduced by bolt holes) and, if desired, row and group tear-out. Usually supplied with a Galvanised Bonded Washer to provide a watertight seal. The shear capacity of the bolt is given by . TIMCO is a supplier of essential products that trade professionals rely on every day. Driver bit included in every box. seasoned wood or unseasoned wood that remains wet, the results of many tests have shown that the maximum with-drawal load is given by the empirical equation pGDL=54 12. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! All rights reserved. Allowable withdrawal load or force of a common wood screw into side grain perpendicular to the fibers of seasoned dry wood can be expressed as. cally have higher ultimate load than wood screws in the smaller gages, because of their uniform shank diameter and full-length thread. Research conducted during the 1980s resulted in lateral resistance values that are currently based on a yield model theory. 4. Also, how much of the 2" screw … Driver bit included in every box. A dense wood that bears weight on the ends of those fiber bundles, like a stump does, can achieve the load carrying capacity of structural steel. Material: Carbon Steel: Length of Thread: Cut thread screws: Aprox. We don't save this data. The diameter of no. -Tabulated values above based on American Wood Council, NDS 2005 Table 11.2A-Information for reference only. Instead of doing the calculations could examine the package or box of wood screws and find information such as follows: "The single-fastener load capacity of the sd9 exceeds the capacity of a 10d common nail, while the single-fastener load capacity of … Hexagon Head Self Drilling Tek Screws; A range of Hexagon Head Self Drilling Tek Screws for external applications, in lengths from 13mm to 100mm. (mm) f’c = 2000 PSI (13.8 MPa) f’c = 3000 PSI (20.7 MPa) f’c = 4000 PSI (27.6 MPa) f’c = 5000 PSI (34.5 MPa) TENSION Lbs. The permissible lateral load-carrying capacity of TimberLok fasteners can be evaluated for any combination of wood member thickness using Annex G of BS5268-2, based on the following parameters: • A screw diameter (d) of 4.8mm • A design yield moment (M y,d) of 11300 Nmm • Load-duration modification factors of 1.00 for long-term, 1.12 for medium-term and 1.25 for short-term and very … 2). Wood Properties – Strengths, Span Tables, etc Fastener Strengths In Wood (Connection Design) Resources Referenced IRC – Residential Code IBC – Commercial Building Code Your State Code . - - - - Call 24/7 on: 03330 112 112 Call 24/7: 03330 112 112 Shop by Product Code Need Help. In comparison, a #10 wood screw (0.190" diameter) has a withdrawal design value of 124 lbs./in. design values for wood screws loaded at any angle to grain were based on the equation 2 = KLD2 where: (C11.3-1) 2 = nominal wood screw lateral design value, Ibs K' = species group constant based on specific gravity (G) of wood members = 4800 Group I G = 0.62 - 0.75 = 3960 Group I1 G = 0.51 - 0.55 It provides assistance in the limit states modelling of timber behaviour and can be used for: Design - the selection of members to carry given design loads; Capacity determination - performance prediction of … (kN) TENSION Lbs. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Brackets, Braces and Plates. Permissible lateral load-carrying capacities The permissible lateral load-carrying capacity of TimberLok fasteners can be evaluated for any combination of wood member thickness using Annex G of BS5268-2, based on the following parameters: • A screw diameter (d) of 4.8mm • … If drilling a straight pilot hole, we recommend the same drill size as the root diameter in hardwoods and 15% smaller in softwoods. Screws with Phillips or square drives have greater resistance to cam out and as such are preferred when using power drivers and thus reducing the likelihood of damaging the screw head, driver bit or wood surface. applicable to wood screws, in accordance with the NDS to determine adjusted design values. and for SPF/HF withdrawal is 121 lb./in. screws and the hardness limits for ASTM A449-10 Type 1 screws. In TB screw the minimum tread length is 60% of the total length of the screw. Some wood screws are tapered from tip to head, also. This simpler formula idealizes things and assumes that all the load is carried by a cylindrical region of the wood that is the diameter and length of the embedded screw threads (the pi*D*L above is the area of this surface). Capacities based on AISI S100 Section E4. Cookies are only used in the browser to improve user experience. Casings and Dowels. Fasteners called wood screws are a metal screw used to clamp wood, chipboard, and MDF. leverage action of a shelf pulling the screw out of the wall). The following table lists maximum speeds limited with regard to the percentage of loading nor­mally recommended for the specific listed materials. en: wood screws allowable withdrawal load. Casters. Assembly Screws. Wood shears much easier in a direction parallel to the grain - consider a screw running perpendicular to the grain: it will shear out to the nearest end-grain if a sufficiently large force is applied to the board parallel to the grain. Table Notes Allowable Screw Connection Capacity (lbs) Thickness (Mils) Design Thickness Fy (Pss = 643 lbs, Pts = 419 lbs) Yield (ksi) Fu Tensile (ksi) #6 Screw #8 Screw #10 Screw #12 Screw ¼" Screw (Pss= 1278 lbs, Pts = 586 lbs) (Pss= 1644 lbs, Pts = 1158 lbs) (Pss= 2330 lbs, … Furniture Equipment Furniture Equipment View All > Furniture Legs. AddThis use cookies for handling links to social media. like with hanging a picture), and pulling loads (i.e. Screw Capacities Table Notes 1. Load Calculator. Structural Wood Screw. Table 1 provides screw descriptions (size, tpi, length), nominal diameters, head style, head diameters, point style, drilling Applications TB: Fixing ironworks to wood, union of load bearing timber structures, union of metallic reinforcement to wood, load bearing timber structures. Bedroom Solutions. Nuts and Washers. (kN) TENSION Lbs. Load capacity caries with shear loads (i.e. Allowable withdrawal load or force of a common wood screw into side grain perpendicular to the fibers of seasoned dry wood can be expressed as, F = allowable withdrawal load or force - lb per inch of penetration (lb/in), The specific gravity of Canadian Spruce is 0.45. In. 4. We don't collect information from our users. Or click & collect in as little as a minute from hundreds of stores. NOTE: 1. Bolts. like with hanging a picture), and pulling loads (i.e. In TB screw the minimum tread length is 60% of the total length of the screw. Table Legs. When selecting the wood screw size and length that best suits your requirements, keep in mind that the threaded portion of a wood screw takes up approximately 2/3 of the total length of the screw leaving 1/3 for the shank and head . Dowels. Screw Fastening Systems Self-Drilling Screw Fastener Selection and Design 3.6.1 Hilti, Inc. (US) 1-800-879-8000 | www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I Direct Fastening Technical Guide 2015 157 Thread Pitch The thickness of material being fastened and diameter of of thread penetration under the same conditions. 3. P S = p s A s. where: p s is the shear strength of the bolt A s is the shear area of the bolt. "Cheap" screws therefore aren't what you need to worry about, instead, focus on the screw size. The Strong-Drive® SDW screw is a 8.0mm diameter, high-strength structural wood screw specifically designed for fastening multi-ply wood members together such as plated trusses, engineered timber products and solid-sawn timber. Double Sided Damp Proof Membrane Jointing Tape, Self Tapping Screws - Pre-Drill Hole Size Chart, Diamond Drill Bits Recommended Drill Speeds. If you use this formula, be sure to reduce the actual load by … You can target the Engineering ToolBox by using AdWords Managed Placements. 10 screw is 0.190 inches. Home » Design Capacity Tables for Timber (DCTT) - Part A (seasoned) The Design Capacity Tables for Timber (DCTT) is a design aid for structural engineers. Load capacity caries with shear loads (i.e. Screw No. Anchors. You must have JavaScript enabled in your browser to utilize the functionality of The ESCR screw has a milling thread to allow for smooth driving of the shank. To countersink fat and oval head screws, use an 82° countersink to create the countersunk recess. (kN) SHEAR … A huge range of Wood Screws available from top brands. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Elongation due to axial load Calculator: Calculates elongation (as well as stress and strain) for prismatic elements subject to axial force. Max. Head diameters listed are standard for Flat Head and Oval-head screws. 3. The geometry of the screw thread also plays a role. F = allowable withdrawal load or force - lb per inch of penetration (lb/in) SG = specific gravity of oven dry wood. Only emails and answers are saved in our archive. The technical data sheets below provide performance data of various TIMco products in a variety of relevant materials, including recommended loads. Some kinds of wood have great fiber strength but tend to warp when cured, which reduces their load carrying capacity. 52/ (metric) (7–1a) pGDL=7 850, 52/ (inch–pound) (7–1b) where p is maximum load (N, lb), L depth (mm, in.) Ultimate test values for withdrawal loads of wood screws inserted into the side grain of seasoned wood may be expressed as: p = 108.25 G 2 D L (Metric screws) p = 15,700 G 2 D L ( inch-lbs) Pull-out happens when you have a shear failure of the wood. Twin-Thread Woodscrew - Zinc - Countersunk, Classic Cylinder Head Decking Screw - Stainless Steel, C2 Cylinder Head Decking Screw - Exterior, In-Dex Timber Screw - Stainless Steel - Hex, In-Dex Timber Screw - Stainless Steel - Wafer, In-Dex Heavy Duty Timber Screw - Exterior, Self-Drilling Screw - Heavy Duty Section Steel, Self-Drilling Screw - Heavy Duty Section Steel - Zinc, Self-Drilling Screw - Heavy Duty Section Steel - Exterior, Self-Drilling Screw - Heavy Duty Section Steel - Bi-Metal, Self-Drilling Screw - Light Duty Section Steel, Self-Drilling Screw - Light Duty Section Steel - Zinc, Self-Drilling Screw - Light Duty Section Steel - Exterior, Self-Drilling Screw - Light Duty Section Steel - Bi-Metal, Stitching Screw - For Sheet Steel - Exterior, Stitching Screw - For Sheet Steel - Bi-Metal, Self-Drilling Screw - For Light Section Composite Panel, Self-Drilling Screw - For Light Section Composite Panel - Exterior, Self-Drilling Screw - For Light Section Composite Panel - Bi-Metal, Slash Point Screw - For Sheet to Timber - Zinc, Slash Point Screw - For Sheet to Timber - Exterior, Wing-Tip Screw - Heavy Section Steel - Zinc, Wing-Tip Screw - Heavy Section Steel - Bi-Metal, Wing-Tip Screw - Light Section Steel -Zinc, Wing-Tip Screw - Light Section Steel - Bi-Metal, Wing-Tip Screw - Light Section Steel - Exterior, Fibre Cement Board Screw - For Light Section Steel, Fibre Cement Board Screw - For Light Section Steel - Exterior, Fibre Cement Board Screw - For Timber - Exterior, Self-Tapping Screw - Pan Head - Stainless Steel, Self-Tapping Screw - Flange Head - Stainless Steel, Collated - Wing-Tip Screw - Light Section Steel, Countersunk Head with Ribs, Single Thread, Gimlet Tip, Countersunk Head, Hi-Low Thread, Slash Tip, Shallow Pan Countersunk Head, Single Thread, Gimlet Tip, Shallow Pan with Serrations, Single Thread, Gimlet Tip, Shallow Pan Countersunk Head, Hi-Low Thread, Slash Tip, Countersunk Head, Self-Tapping Thread, Self-Drilling Point (3.9 Gauge), Countersunk Head, Self-Tapping Thread, Self-Drilling Point (4.8 Gauge), Countersunk Facet Head, Metric Thread, Self-Drilling Point, Countersunk Head, Metric Thread, Self-Drilling Point, Pan Head, Self-Tapping Thread, Drill Point, Shallow Pan, Self-Tapping Thread, Self-Drilling Point, Carriage Bolt, Washer & Nut - Exterior Green, Carriage Bolt, Washer & Nut - Exterior Silver, Carriage Bolt & Nut - Hot Dipped Galvanised, Countersunk Socket Screw - Stainless Steel, Countersunk Socket Screw & Nut - Stainless Steel, Button Socket Screw & Nut - Stainless Steel, Threaded Bar - High Tensile - Zinc Plated (Grade 8.8), Metal Insulation Fixing - Plastic Cover Cap, Multi-Fix Concrete Screw - Countersunk - Yellow, Multi-Fix Concrete Screw - Countersunk - Zinc, Paslode Collated Nails & Fuel Cells Packs, Paslode Collated Brad Nails & Fuel Cells Packs, Professional Foil & Cartridge Applicator Gun, Multi-Fix 9 in 1 Crystal Clear Adhesive & Sealant, Multi-Fix 9 in 1 Universal Adhesive & Sealant, Multi-Fix 6 in 1 Polyurethane Wood Adhesive, Premium Internal & External D4 Wood Adhesive, B1 Fill & Fix Fire Rated Expanding PU Foam, Wood Cutting - Bi-Metal Reciprocating Saw Blades, Metal Cutting - Bi-Metal Reciprocating Saw Blades, Wood Cutting - HCS Reciprocating Saw Blades, Block Cutting - TCT Reciprocating Saw Blades, Titanium Coated Bi-Metal Multi-Tool Blades, Steel Wire Wheel Brush with Plastic Reducer Set, Twin Ball Bearing Hinges - Stainless Steel, Standard Double Strap Fieldgate Hinge Set, Double Strap Fieldgate Hinge Set With Hook On Plate, Adjustable Fieldgate Hinge Set With Hook On Plate. Caution. of penetration in the side grain of wood having a specific gravity of 0.48 (such as Douglas Fir, South). Applications INV: Installation of … Total withdrawal load is based on actual thread penetration into the main member. 283SS ®LOX® Stainless Steel 316 Wood Screws Featuring LOX advanced driver system engineered for high-torque applications. Technical data sheet; Buy online; Features. Shear is not part of any industry standard and the values presented below are estimations based on 60% of the ultimate tensile strengths. Values shown in Table 3 for wood screws are based on 1/4-in. Recommended RPM Capacity in Cubic Feet Per Hour; Normal % Loading * Normal % Loading * AT 1 RPM; 15 30A 30B 45 15 30A 30B Screw Plugs. The Strong-Drive® SDW screw is a 8.0mm diameter, high-strength structural wood screw specifically designed for fastening multi-ply wood members together such as plated trusses, engineered timber products and solid-sawn timber. Provides users with a web-based approach to calculating capacities for single bolts, nails, lag screws and wood screws per the 2015 NDS. Applications INV: Installation of … Capacities are based on Allowable Strength Design (ASD) and include safety factor of 3.0. The root diameter on some wood screws tapers along the length of the threads. The pull-out strength of a wood screw is going to be more dependent on the wood into which it is installed than on the material of the screw. It provides assistance in the limit states modelling of timber behaviour and can be used for: Design - the selection of members to carry given design loads. Ideal for fixing cladding to steel constructions. Teks Lath Screws are ideal for attaching lath to wood or steel studs for stucco/plaster applications, attaching pre-drilled metal brackets to post-framing, or any general applications requiring a wide, low-profile head. Screws should be inserted by turning and not by driving with a hammer, which will reduce the load-carrying capacity significantly. (kN) SHEAR Lbs. By using our services, you agree to our use of cookies. Applications TB: Fixing ironworks to wood, union of load bearing timber structures, union of metallic reinforcement to wood, load bearing timber structures. Some of our calculators and applications let you save application data to your local computer. Head diameters listed are standard for Flat Head and Oval-head screws. Google use cookies for serving our ads and handling visitor statistics. Buy Wood Screws at Screwfix.com. Lump Size (IN.) Machine Screws. Floor Protection. and for SPF/HF withdrawal is 121 lb./in. Metal Screw. D = diameter of screw … When connecting materials of different steel thicknesses or tensile strengths, use the lowest values. this website. JavaScript seems to be disabled in your browser. Round Head screws can be 5% to 10% smaller. Most shelves will have both types of loads, but the design of the shelf will help determine the type of load. Diaphragms vary considerably in load-carrying capacity, depending on whether they are “blocked” or “unblocked.” Blocking consists of lightweight nailers, usually 2x4s, framed between the joists or other primary structural supports for the specific purpose of connecting the edges of the panels. Some wood screws are tapered from tip to head, also. (mm) MIN. Lag screws Wood screws 19% MC Dry C M 1.0 0.7 0.4 Lateral Load 1.0 0.7 1.0 Withdrawl Load (lag & wood screws only) fabrication MC in-service MC 2005 NDS Provisions Wet Service Factor, CM for connection Z values Saturated 19% MC Bolts Lag screws Wood screws CM = 1.0 if: 1 fastener CM = 0.7 if D < ¼” 19% MC Dry C M 0.4 Lateral Load fabrication MC Cookies help us deliver our services. Loads may be increased for load duration up to a C D = 1.60. The diameter of a screw is measured on the smooth part of the shank, or the outer edge of the thread, and ranges from 6mm to 20mm for coach screws, and from 4mm to 8mm for countersunk screws.

wood screw load capacity table

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