Holdowns & Tension Ties
LTT/HTT Tension Ties
Holdowns & Tension Ties
Tension ties offer a solution for resisting tension loads that are fastened with nails. The HTT4 and HTT5 are the latest generation of tension ties. They feature an optimized nailing pattern which results in better performance with less deflection. Designed to meet new code standards, the HTT4 and HTT5 offer higher loads than their predecessors. HTT5KT is sold as a kit with the holdown, bearing plate washer and Strong-Drive ® SD Connector screws. The HTT5- 3⁄4 is designed to use a ¾" diameter anchor bolt. 3⁄4" epoxied anchor bolts are commonly used when retrofitting tension ties to horizontal wood members. 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 with 10dx1 1⁄2. The LTTI31 is designed for wood chord open web truss attachments to concrete or masonry walls and may also be installed vertically on a minimum 2x6 stud. MATERIAL: See table FINISH: Galvanized. May be ordered HDG; contact Simpson Strong-Tie. INSTALLATION: • See General Notes on page 45. • A standard cut washer is required for LTT19 and LTT20B when using 1 ⁄2" or 5⁄8" anchor bolts. No additional washer is required when using ¾" anchor bolt. CODES: See page 12 for Code Reference Key Chart.
Load transfer plate washer not required
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
Model No. LTT19
W
16
1 3⁄4
LTT20B
12
2
LTTI31
18
3 3⁄4
HTT4 C-C-2015 © 2015 SIMPSON STRONG-TIE COMPANY INC. PRINTED 12/14
Dimensions
Strap Mat. (Ga)
11
2 1⁄2
HTT5
11
2 1⁄2
HTT5KT
11
2 1⁄2
HTT5-3⁄4
11
2 1⁄2
Fasteners Seat ThickAnchor L CL ness Fasteners Bolts 1 5 8-10dx1 1⁄2 ⁄2, ⁄8 19 1⁄8 1 3⁄8 5⁄16 or 3⁄4 8-10d 10-10dx1 1⁄2 1 ⁄2, 5⁄8 19 3⁄4 1 1⁄2 5⁄16 10-10d or 3⁄4 2-1⁄2" Bolt 5 31 1 3⁄8 1⁄4 ⁄8 18-10dx1 1⁄2 18-10dx1 1⁄2 18-10dx1 1⁄2 5 12 3⁄8 1 5⁄16 7⁄16 ⁄8 18-16dx2 1⁄2 18-SD #10x1 1⁄2 18-SD #10x1 1⁄2 26-10dx1 1⁄2 26-10d 5 16 1 5⁄16 7⁄16 ⁄8 26-16dx2 1⁄2 26-SD #10x1 1⁄2 5 16 1 5⁄16 7⁄16 ⁄8 26-SD #10x2 1⁄2 26-10dx1 1⁄2 7 3 5 16 1 ⁄16 ⁄16 ⁄4 26-SD #10x1 1⁄2 26-16dx2 1⁄2
Minimum Wood Member Size 3 x 3 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 1 1⁄2 x 5 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 1 1⁄2 x 5 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 3 x 3 1⁄2 1 1⁄2 x 5 1⁄2 3 x 3 1⁄2 1 1⁄2 x 5 1⁄2 1 1⁄2 x 7 1⁄4 3 x 3 1⁄2
HTT5
LTT20B
LTTI31
(HTT4 similar)
(LTT19 similar)
These products are approved for installation with the Strong-Drive ® SD Connector screw. See page 27 for more information.
Allowable Tension Loads (160) DF/SP
SPF/HF
Deflection at Highest Allowable Load
1310 1340 1355 1500 1625 1350 3000 3610 4235 4455 4455 4350 4670 50903 4555 5445 4065 4830 5090
1125 1150 1165 1290 1400 1160 2580 3105 3640 3830 3830 3740 4015 43753 3915 5360 3495 4155 4275
0.180 0.157 0.195 0.185 0.183 0.193 0.090 0.086 0.123 0.112 0.112 0.120 0.116 0.135 0.114 0.103 0.103 0.100 0.121
Code Report
L19, IP2, F4
3" Min.
Preservativetreated barrier may be required
160 L19, IP2, F4 160 L19, IP2, F4 160 160 160
Vertical HTT4 Installation
1. LTT holdowns may not be installed more than 4½" above the top of concrete. 2. LTTI31 installed flush with concrete or masonry has an allowable load of 2285 lbs. 3. Allowable load for HTT5 with a BP5⁄8-2 bearing plate washer installed in the seat of the holdown is 5295 lbs. for DF/SP and 4555 lbs. for SPF/HF. 4. FASTENERS: 10dx1 1⁄2 = 0.148 dia. x 1 1⁄2" long, 10d = 0.148" dia. x 3" long, 16dx2 1⁄2 = 0.162" dia. x 2 1⁄2" long, SD #10x1½ = 0.161" dia. x 1 1⁄2", SD #10x2 1⁄2 = 0.161" dia. x 2 1⁄2".
Hanger not shown for clarity
2"
Horizontal LTTI31 Installation Horizontal HTT Installation
Horizontal LTT19 Installation (LTT20B similar) 49