Hitools

CJT Concealed Joist Tie

Model: CJT

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The CJT Concealed Joist Tie is part of our concealed structural connector range, which combines structural strength with invisibility. The CJT offers tested performance in a joist connection with a clean, concealed look. Designed for versatility as well as hidden beauty, the CJT allows the joist to be angled up to 45° up or down with no reduction in load. It is part of a concealed connector system that includes the CBT and CPT.

Please check the Corrosion Information to see if it is suitable for your application.

Material

Carbon Steel 2.7mm thick

Finish

ZMAX^® Galvanised

Features & Benefits

Manufactured in heavier gauge steel for a stronger connection
Can be installed three ways: with no routing of the header/post or beam (for a quicker installation) or with the header/post or beam routed for a flush look
Joists can be sloped up to 45° angle with full table loads
This connector can be used for end of header joists or corner connections
Tested and load-rated engineering data available
Suitable for Glulam and solid sawn timber
All pins and fasteners needed for installation are included

Installation

Use all specified fasteners
The CJT Kit comes complete with 70mm dowels and Simpson Strong‑Tie^® Strong‑Drive^® 6.4mm x 76mm Heavy‑Duty Connector screws. Screws require a hex‑head driver
Router end of beam for screw heads for flush installation
The carried member may be sloped up or down to 45° with full table loads
To provide maximum beam width for use with short dowels, centre in beam
Note: This connector requires special attention to ensure correct installation. The beam must be installed perpendicular to the support member. The connection's components may be damaged if the beam is rotated from its opposite end during or after installation. Damaged components may not be noticeable and may reduce the connector's load carrying capacity

Model No. Table

Model No.	Min. Joist Size	Dimensions (mm)		Fasteners		Design Capacity (kN)
		H1	H2	Post (No. – Length x Dia., mm)	Joist Pins (No. – 12.7 x 70mm)	Uplift k1 = 1.0	Download
		H1	H2	Post (No. – Length x Dia., mm)	Joist Pins (No. – 12.7 x 70mm)	Uplift k1 = 1.0	Floor k1 = 0.8	Roof k1 = 0.8
CJT3ZS	90 x 140	141	113	6 – SDS6.4 x 76	3	2.38	5.65	5.65
CJT3ZS	90 x 184	141	113	6 – SDS6.4 x 76	3	3.91	8.43	8.43
CJT4ZS	90 x 235	178	151	8 – SDS6.4 x 76	4	5.96	13.22	13.22
CJT5ZS	90 x 286	217	189	10 – SDS6.4 x 76	5	7.80	15.74	15.74
CJT6ZS	90 x 286	254	227	12 – SDS6.4 x 76	6	9.94	18.11	18.11
Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by the NZ Strength Reduction Factor (φ), and applicable the k modification factors following NZS 3603 and (2) the Serviceability Capacity which is the load at 3.2mm joint slip. Design Capacity is the minimum of test data and structural joint calculation. For NZ, the Strength Reduction Factor (φ) is 0.80 for nails in lateral load and 0.70 for other fasteners. Duration of Load Factor (k1) is as shown. Reduce Duration of Load Factor where applicable. Capacities may not be increased. Timber species for joint design is seasoned Radiata Pine, which is New Zealand Joint Group J5 per NZS 3603 Table 4.1.

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