LTT/HTT Tension Ties

LTT20B
(LTT19 similar)

HTT5
(HTT4 similar)
U.S. Patent
5,467,570

Horizontal HTT Installation

Vertical HTT4 Installation

Horizontal LTTI31 Installation

Vertcal LTT19 Installation
(LTT20B similar)

Installation

View step-by-step installation instructions

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.
Refer to Anchor Designer Software™ for ACI 318 for anchoring solutions.

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.

roll over images below to see larger image

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 Strong-Drive SD Structural-Connector screw.

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"x3 1/2" 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.

					Legacy Reports
	IAPMO ES 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.
HTT16			RR25818	FL11496
HTT22			RR25818	FL11496
HTT4	ER-130 / ER-124		RR25818 / RR25489	FL11496 / FL13872
HTT5	ER-130 / ER-124		RR25818 / RR25489	FL11496 / FL13872
LTT	See specific model numbers for code listings.
LTT19	ER-130		RR25818	FL11496
LTT20B	ER-130		RR25818	FL11496
LTTI31	ER-130		RR25818	FL11496

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
HTT16	HTT16: DWG \| DXF HTT16 front view: DWG \| DXF HTT16 left view: DWG \| DXF HTT16 right view: DWG \| DXF HTT16 top view: DWG \| DXF	High Wind-Resistant Construction D57: Pile/Girder to Wall: DWG \| DXF
HTT22	HTT22: DWG \| DXF HTT22 front view: DWG \| DXF HTT22 left view: DWG \| DXF HTT22 right view: DWG \| DXF HTT22 top view: DWG \| DXF	High Wind-Resistant Construction D19: Girder/Truss To Masonry/Concrete: DWG \| DXF High Wind-Resistant Construction D4: Girder/Truss to Wall Framing: DWG \| DXF High Wind-Resistant Construction D52: Header to Wall Framing: DWG \| DXF High Wind-Resistant Construction D7: Girder/Truss to Wall Framing: DWG \| DXF High Wind-Resistant Construction D90: Holdowns: DWG \| DXF Girder/Truss to Concrete Connections 1: DWG \| DXF HTT22 Horizontal: DWG \| DXF HTT22: DWG \| DXF
HTT4	HTT4: DWG \| DXF HTT4 front view: DWG \| DXF HTT4 left view: DWG \| DXF HTT4 right view: DWG \| DXF HTT4 top view: DWG \| DXF	None for this model
HTT5	HTT5: DWG \| DXF HTT5 front view: DWG \| DXF HTT5 left view: DWG \| DXF HTT5 right view: DWG \| DXF HTT5 top view: 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 D6: 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