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LTT/HTT Tension Ties
Installation
Tension ties offer a solution for resisting tension loads that is fastened with nails. The entire line of tension ties has been tested and evaluated to the requirements of AC155.
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.
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:
- Use all specified fasteners. See General Notes.
- For use in vertical and horizontal applications.
- 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.
- The Designer shall specify anchor bolt type, length and embedment. See SB and SSTB Anchor Bolts.
For tension ties, per ASTM test standards, anchor bolt nut should be finger-tight plus 1/3 to 1/2 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.
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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.
These models are approved for installation with the 
- Allowable loads have been increased for wind or earthquake load durations with no further increase allowed; reduce where other load durations govern.
- Post design by Specifier. Tabulated loads are based on minimum 3" x 3 1/2" (2-2x4) post (in 3 1/2" wall). Post may consist of multiple members provided they are connected independently of the holdown fasteners. See Post Capacities for common post allowable loads.
- A standard cut washer is required under anchor nut for LTT19 and LTT20B when using 1/2" or 5/8" anchor bolts. No additional washer is required when using a 3/4" anchor bolt.
- Deflection at Highest Allowable Tension Load includes fastener slip holdown deformation, and anchor bolt elongation for holdowns installed up to 4 1/2" above top of concrete. HTT4 and HTT5 may be installed raised up to 18" above top of concrete with no load reduction provided that additional elongation of the anchor rod is accounted for.
- If the base of the LTTI31 is installed flush with a concrete or masonry wall, then the allowable load is 2285 lbs.
- Allowable tension load for HTT5 with a bearing plate washer BP5/8-2 (sold separately) installed in the seat of the holdown is 5295 for DF/SP and 4555 for SPF/HF.
- HTT5KT is sold as a kit with the holdown, BP 5/8-2 bearing plate washer and 26-SD #10x2 1/2 screws.
- Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect installation into the wide face. See technical bulletin T-SCLCOLUMN for values on the narrow face (edge).
- HTT4 with SD #10x1 1/2 screws achieves full load on a single 2x6 stud or joist.
- 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 #10x2 1/2 = 0.161" dia. x 2 1/2",
SD #10x1 1/2 = 0.161" dia. x 1 1/2".
See other fastener sizes and information.
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top Code Reports (PDFs): | Legacy Reports | |||||||
| IAPMO UES ER | ICC-ES ESR | CITY OF LOS ANGELES | STATE OF FLORIDA | ICC-ES NER | ICC-ES ER | ICC-ES ES | |
| HTT | See specific model numbers for code listings. | ||||||
| HTT4 | ER-130 / ER-124 | RR25818 / RR25489 | FL10456 / FL11496 | ||||
| HTT5 | ER-130 / ER-124 | RR25818 / RR25489 | FL10456 / FL11496 | ||||
| LTT | See specific model numbers for code listings. | ||||||
| LTT19 | ER-130 | RR25818 | FL11496 | ||||
| LTT20B | ER-130 | RR25818 | FL11496 | ||||
| LTTI31 | ER-130 | RR25818 | FL11496 | ||||
next topDrawings: To download drawings, right-click or Ctrl-click on the link, then choose "Save Target As..."Download the Simpson Strong-Tie® AutoCAD® Menu, which allows you to insert Ortho views directly into your AutoCAD drawing.
ORTHOGRAPHIC | PERSPECTIVE | |
| HTT | None for this model |
HGT with HTT: DWG
| DXF
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| HTT4 |
HTT4: DWG | DXF
HTT4 front view: DWG | DXF HTT4 left view: DWG | DXF HTT4 right view: DWG | DXF HTT4 top view: DWG | DXF |
High Wind-Resistant Construction D70: Wall to Pile/Girder: DWG
| DXF
|
| HTT5 |
HTT5: DWG | DXF
HTT5 front view: DWG | DXF HTT5 left view: DWG | DXF HTT5 right view: DWG | DXF HTT5 top view: DWG | DXF |
High Wind-Resistant Construction D103: Holdowns: DWG
| DXF
High Wind-Resistant Construction D21: Girder/Truss To Masonry/Concrete: DWG | DXF High Wind-Resistant Construction D58: Header to Wall Framing: DWG | DXF High Wind-Resistant Construction D9: Girder/Truss to Wall Framing: DWG | DXF HTT5: DWG | DXF |
| LTT | None for this model | None for this model |
| LTT19 |
LTT19: DWG | DXF
LTT19 front view: DWG | DXF LTT19 left view: DWG | DXF LTT19 right view: DWG | DXF LTT19 top view: DWG | DXF |
LTT19 & W: DWG
| DXF
|
| LTT20B |
LTT20B: DWG | DXF
LTT20B front view: DWG | DXF LTT20B left view: DWG | DXF LTT20B right view: DWG | DXF LTT20B top view: DWG | DXF |
High Wind-Resistant Construction D8: Girder/Truss to Wall Framing: DWG
| DXF
|
| LTTI31 |
LTTI31: DWG | DXF
LTTI31 front view: DWG | DXF LTTI31 left view: DWG | DXF LTTI31 right view: DWG | DXF LTTI31 top view: DWG | DXF |
LTTI31: DWG
| DXF
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Connectors Installed on SCL Columns, Limit States Design, for Canada only