MA1232PHG
Version 1.04 (2020/4/22)

Tnut-Plus Instruction Manual
Refer to the chuck instruction manual.
Tnut-Plus is T-nut for mounting soft jaw of the power chuck. It can be used only with the chuck of Table
1. Soft jaws formed using the Tnut-Plus can maintain the gripping accuracy equivalent to just-formed
soft jaws even after they are removed from the chuck once, because they can be reinstalled in thesame positions.
To maintain the installation repeatability of the Tnut-Plus for a long period of time, always tighten
the jaw mounting bolts from the chuck outside diameter side with the specified torque. (SeeFigure 2 and Table 2)
The Tnut-Plus is elastically deformed when the bolts are tightened. Therefore, although theresistance you feel when tightening the bolts is different from ordinary T-nuts, it is normal.
If the Tnut-Plus is used for a long period of time, the soft jaws may be fixed and become hard tobe removed. In this case, remove them by tapping with a plastic hammer. If you apply CHUCKGREASE PRO to the side of the T-nut, it becomes hard to fix.
The gripping accuracy may be deteriorated due to aging such as fatigue of the workpiece
gripping surface. In such a case, re-form the soft jaws.
Table 1 Correct chuck typeTnut-Plus type
Chuck type
TN06PLUS
BR06
TN08PLUS
BR08
TN10PLUS
BR10
TN12PLUS
BR12

Chuck outside
diameter side

Table 2 Specified torqueThread size
Tightening torque [N・m]
M833
M1073
M12107M14
171
M16250M20402*Strength classification : 12.9

Failure to follow the safety precautions below could result in death or serious
injuries.
Mount the Tnut-Plus with the chamfer side facing the chuck inside diameter side. (See Figure 1)
If it is mounted in the opposite direction, seizure may occur due to significant deformation of themaster jaws. As a result, the gripping force will be reduced, causing the workpiece to fly out.
Do not use the Tnut-Plus on a chuck that does not correspond to it. (The T-slot shapes of suchchucks do not match the Tnut-Plus, so the Tnut-Plus cannot be mounted physically. Do not use
the Tnut-Plus forcedly on such chucks by additionally machining them.)
If the Tnut-Plus is used on such chucks, seizure may occur due to significant deformation of themaster jaws. As a result, the gripping force will be reduced, causing the workpiece to fly out. Additional
machining of the T-nut and master jaws may damage them, causing the workpiece to fly out.
Do not use soft jaws manufactured by other companies.
If soft jaws manufactured by other companies are used, seizure may occur due to significant
deformation of the master jaws. As a result, the gripping force will be reduced, causing the workpiece
to fly out. Using soft jaws manufactured by other companies may damage the T-nut, causing theworkpiece to fly out.

Warning

Indicates instructions which, if you do not heed given instructions, could result indamage to the product or shortened service life, or damage to peripheral equipment.
Do not use soft jaws manufactured by other companies. When mounting already-formed soft
jaws again, use the same T-nut used when the soft jaws were formed, match the jaw No. of thesoft jaws and master jaws, and mount the soft jaws in the same serration position. Also,
carefully clean fitting parts of the serration and the T-nuts.
Failure to follow the above precautions may lead to poor accuracy.

NoticeKitagawa Corporation Kitagawa Global hand Company
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Tel. +81-847-40-0561
Fax. +81-847-45-8911
https://www.kitagawa.com■Oversea
America① Tighten first.
② Tighten next.

EuropeAsia
Chuck inside
diameter side

Chamfer
Oceania

Figure 1 Tnut-Plus

Figure 2 Tightening order of the jaw mounting bolts

KITAGAWA-NORTHTECH INC.
TECNARA TOOLING SYSTEMS, INC.
KITAGAWA EUROPE LTD.
KITAGAWA EUROPE GmbHKITAGAWA EUROPE GmbH Poland Office
KITAGAWA EUROPE GmbH Czech Office
KITAGAWA EUROPE GmbH Romania Office
KITAGAWA EUROPE GmbH Hungary Office
KITAGAWA INDIA PVT LTD.
KITAGAWA (THAILAND) CO., LTD. Bangkok Branch
Kitagawa Corporation(Shanghai)
Kitagawa Corporation(Shanghai) Guangzhou Office
DEAMARK LIMITEDKITAGAWA KOREA AGENT CO., LTD.
DIMAC TOOLING PTY. LTD.

https://www.kitagawa.us
https://www.tecnaratools.com
https://www.kitagawa.global/en
https://www.kitagawa.global/dehttps://www.kitagawa.global/pl
https://www.kitagawa.global/cz
https://www.kitagawa.global/rohttps://www.kitagawa.global/hu
https://www.kitagawa.global/in
Tel. +66 2-712-7479
http://www.kiw-sh.com
Tel.+86 20-2885-5276
http://www.deamark.com.tw
http://www.kitagawa.co.kr
https://www.dimac.com.au