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For laterally loaded screws, a working <br />load of normal duration may be <br />approximated by dividing the tabulated <br />ultimate load by 5 or 6. For practically <br />all laterally loaded screw connections <br />shown, the normal-duration working <br />load will correspond to a joint slip of <br />less than 0.01 inch. <br />TABLE 5. <br />Load Adjustment for Screws into <br />Plywood for Species Groups Noted(a)(b) <br />Types of All-All-All- <br />Loading Group 1 Group 2 Group 3, 4, 5 <br />Lateral 100%78%78% <br />Withdrawal 100%60%47% <br />(a) Adjustments based on the species groups for plywood shown in Voluntary Product Standard PS 1 <br />and the equations in U.S. Agricultural Handbook No. 72. <br />(b) Face, back, and core veneer must be of the same species group. When species group is unknown, <br />assume all-Group 4. <br />TABLE 6. <br />Wood Screws: Plywood-to-Plywood Edge Connections(a) <br />Depth of <br />Threaded <br />Ultimate Lateral Ultimate Withdrawal <br />Penetration <br />Load (lb)(b)Load (lb)(b) <br />(in.)#8 #10 #12 #8 #10 #12 <br />1 180 (185) 195 360 (405) 450 <br />1-1/2 180 (185) 195 410 (455) 500 <br />(a) Plywood receiving screw thread was 3/4"-thick C-D grade with exterior glue (Group 2 inner plies). <br />(b) Values in parentheses are estimates based on other tests. <br />Adjustments for shorter or longer <br />duration of load apply to design values <br />for mechanical fasteners where the <br />strength of the wood (i.e., not the <br />strength of the metal fastener) deter- <br />mines the load capacity. Adjustments <br />of design values for varying durations <br />of load and combinations of load <br />should be in accordance with the <br />current AF&PA National Design <br />Specification for Wood Construction. <br />A P A <br />The Engineered Wood Association <br />We have field representatives in most <br />major U.S. cities and in Canada who can <br />help answer questions involving APA <br />trademarked products. For additional <br />assistance in specifying APA engineered <br />wood products, get in touch with your <br />nearest APA regional office. Call or write: <br />WESTERN REGION <br />7011 So. 19th St. P.O. Box 11700 <br />Tacoma, Washington 98411-0700 <br />(253) 565-6600 Fax: (253) 565-7265 <br />EASTERN REGION <br />2130 Barrett Park Drive, Suite 102 <br />Kennesaw, Georgia 30144-3681 <br />(770) 427-9371 Fax: (770) 423-1703 <br />U.S. HEADQUARTERS <br />AND INTERNATIONAL <br />MARKETING DIVISION <br />7011 So. 19th St. P.O. Box 11700 <br />Tacoma, Washington 98411-0700 <br />(253) 565-6600 Fax: (253) 565-7265 <br />PRODUCT SUPPORT HELP DESK <br />(253) 620-7400 <br />E-mail Address: help@apawood.org <br />(Offices: Antwerp, Belgium; Bournemouth, <br />United Kingdom; Hamburg, Germany; <br />Mexico City, Mexico; Tokyo, Japan.) For <br />Caribbean/Latin America, contact <br />headquarters in Tacoma. <br />The product use recommendations in this <br />publication are based on APA – The <br />Engineered Wood Association’s continuing <br />programs of laboratory testing, product <br />research, and comprehensive field experi- <br />ence. However, because the Association has <br />no control over quality of workmanship or <br />the conditions under which engineered wood <br />products are used, it cannot accept responsi- <br />bility for product performance or designs as <br />actually constructed. Because engineered <br />wood product performance requirements <br />vary geographically, consult your local archi- <br />tect, engineer or design professional to <br />assure compliance with code, construction, <br />and performance requirements. <br />Form No. E830C <br />Revised December 1995/0100 <br />www.apawood.org <br />@WebAddress: <br />TN,E830.0 4/13/00 10:11 AM Page 4 <br />Page 32 <br />© 1995 APA - The Engineered Wood Association <br />2130 N Grand Ave <br />10/1/2024