Page 39 of Wood Construction Connectors 2006 Catalog by Simpson Strong-Tie

40 Anchors LTT/MTT/HTT Tension Ties Model No. Material (Ga) Dimensions Fasteners Allowable Tension Loads SPF/HF Deflection at Highest Allowable Design Load Strap Plate W L Anchor Bolts Nails Bolts Qty Dia (133) (160) LTT19 16 3 1 19 1 8-16d Sinkers 1085 1305 0.107 LTT20B 6 12 3 2 19 1 10-16d 2 1675 1750 0.164 LTTI31 18 3 3 31 1 18-10dx1 1985 2310 0.125 HTT16 11 2 16 1 18-16d 3080 3695 0.037 HTT22 11 2 22 1 32-16d Sinkers 4670 5250 0.087 MTT28B 12 7 2 27 1 or , or 24-16d 4 4140 4455 0 2, 40, 82, 121 6, 40, 82 30, 99, 122 40, 97, 99, 122 40, 122 .125 Allowable Tension Loads DF/SP (133) (160) Nails Bolts N Nails Nails ails Bolts 1205 1350 1750 1220 1750 1460 2185 2310 3480 4175 5250 5260 4455 2150 4455 2725 Seat Thickness Code Ref. C L 1. Allowable loads for HTT are based on the lower of the 2001 NDS fastener values or the ultimate load on a steel test jig divided by 2.5. 2. 16d sinkers (0.148" dia. x 3 long) or 10d commons may be substituted for the specified 16d commons at 0.85 of the table loads. 3. The Designer must specify anchor bolt type, length and embedment. 4. Allowable loads have been increased for earthquake or wind load durations with no further increase allowed; reduce where other load durations govern. 5. Bolt values are based on a minimum lumber thickness of 1 ". 6. If a or anchor bolt is used for the LTT20B, add a standard cut washer to the seat. No additional washer is required for a anchor bolt. See table for appropriate anchor bolt sizes. 7. HTT22 holdown installed raised off the plate has a load of 5190 lbs. HTT16 installed raised off the plate will achieve the table loads. 8. Post design shall be by Designer. 9. NAILS: 16d 0.162" dia. x 3 long, 10dx1 0.148" dia. x 1 long, 16d sinker 0.148" dia. x 3 long. See page 16-17 for other nail sizes and information. LTTI31 MTT28B U.S. Patent 4,744,192 LTT20B DO NOT MODIFY THE MTT28B. Do not rotate the MTT28Bs strap around the rivet. The strap must be in line vertically with the body of the holdown to achieve table loads. See Girder Tiedown Connectors on page 153 167 for installation solutions. The HTT22 is a single-piece formed tension tie no rivets, and a 4-ply formed seat which wont unfold during loading. No washers required. The LTT19 Light Tension Tie is designed for 2x joists or purlins and the LTT20B is for nail- or bolt-on applications. The 3" nail spacing makes the LTT20B suitable for wood I-joists if 10dx1 nails are substituted for the specified 16ds. The LTTI31 is designed for wood chord open web truss attachments to concrete or masonry walls. MATERIAL: See table FINISH: Galvanized. May be ordered HDG; check factory. INSTALLATION: Use all specified fasteners. See General Notes. Use the specified number and type of nails to attach the strap portion to the top or side of purlin or beam (minimum 4x width (2-2x4 or 4x4), except LTT19). Bolt the base to the wall or foundation with a suitable anchor; see table for the required bolt diameter. Do not install LTT and MTT tension ties raised. The HTT22 can be substituted for the MTT28B. See Epoxy-Tie Adhesive System, pages 29 for tested, load-rated epoxies for anchor bolt options. To tie double 2x members together, the designer must determine the fasteners required to bind members to act as one unit without splitting the wood. See Simpson Anchor Systems for tested, load-rated anchors and request T-ANCHORSPEC for more information. CODES: See page 12 for Code Listing Key Chart. Horizontal LTT19 Installation (LTT20B similar) HTT22 (HTT16 similar) U.S. Patent 5,467,570 Horizontal LTTI31 Installation Vertical HTT22 Installation Pressure-treated barrier may be required. For holdowns, per ASTM test standards, anchor bolt nut should be finger-tight plus to turn with a hand wrench, with consideration given to possible future wood shrinkage. Care should be taken to not over-torque the nut. Impact wrenches should not be used. Available with additional corrosion protection. Check with factory.

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