LTT/MTT/HTT Tension Ties

LTT20B
(LTT19 similar)

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

HTT22
(HTT16 similar)
U.S. Patent 5,467,570

Horizontal LTTI31 Installation

Horizontal LTT19 Installation
(LTT20B similar)

Vertcal HTT22 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.

NEW! 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 HTT16 and HTT22. For an added benefit, the HTT5 installs with 6 fewer nails than the HTT22.

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

roll over images below to see larger image

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.

The Designer must specify anchor bolt type, length and embedment.
See SB Anchor Bolts. Refer to Anchor Designer Software™ for ACI 318 for anchoring solutions.
Allowable loads have been increased for wind or earthquake load durations with no further increase allowed; reduce where other load durations govern.
Allowable loads are based on a minimum lumber thickness of 3".
If a 1/2" or 5/8" anchor bolt is used for the LTT19 or LTT20B, add a standard cut washer to the seat. No additional washer is required for a 3/4" anchor bolt. See table for appropriate anchor bolt sizes.
If the base of the LTTI31 is installed flush with a concrete or masonry wall, then the allowable load is 2285 lbs.
Tension values are valid for holdowns flush or raised off of sill plate.
Allowable tension load with a bearing plate washer BP5/8-2 (sold separately) is 5395 lbs. for HTT5 and 4265 lbs. for HTT22.
Deflection at Highest Allowable Tension Load includes fastener slip, holdown elongation, and anchor bolt elongation (L = 6"). Additional elongation of anchor bolts shall be accounted for by the Designer when holdowns are raised higher than 6".
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).
NAILS: 16dx2 1/2= 0.162" dia. x 2 1/2" long, 10d = 0.148" dia. x 3" long, 10dx1 1/2= 0.148" dia. x 1 1/2" long. See other nail 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	ER-130		RR25818	FL11496
HTT22	ER-130		RR25818	FL11496
HTT4	ER-130		RR25818	FL11496
HTT5	ER-130		RR25818	FL11496
LTT	See specific model numbers for code listings.
LTT19	ER-130		RR25818	FL11496
LTT20B	ER-130		RR25818	FL11496
LTTI31	ER-130		RR25818	FL11496
MTT	See specific model numbers for code listings.

Download the Simpson 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 D52: Header to Wall Framing: DWG \| DXF High Wind-Resistant Construction D90: Holdowns: DWG \| DXF High Wind-Resistant Construction D4: Girder/Truss to Wall Framing: DWG \| DXF High Wind-Resistant Construction D7: Girder/Truss to Wall Framing: DWG \| DXF High Wind-Resistant Construction D19: Girder/Truss To Masonry/Concrete: DWG \| DXF Girder/Truss to Concrete Connections: DWG \| DXF HTT22 Horizontal: DWG \| DXF HTT22: DWG \| DXF
HTT4	None for this model	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
MTT	None for this model	None for this model