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OpTiONS pROTECTiVE BOOTS

For Traveling Nut Design Machine and Ball Screw Jacks
Joyce boots for Traveling Nut (KFTN, rotating screw) Jacks protect the screw from
dust, dirt, and help maintain proper lubrication. Standard boots, fabricated from
neoprene-coated nylon, also guard against moisture and corrosive contaminants.

KFTN design jacks require an upper and lower boot to cover the rotating lifting screw.
Diagrams of upright and inverted machine screw jacks are shown. Refer to the chart
below to find the outside boot diameter, sleeve diameter, and the large and small
diameter of the traveling nut. (When mounting boots to ball screw jacks, do not attach
them to the small traveling nut diameter.)

Adding dual protective boots increases the closed height and screw length of
KFTN jacks. Since many mounting configurations exist, customers will need to
provide additional mounting detail.

Contact Joyce/Dayton for:
• Specific mounting options for ball screw jacks
• Specific mounting options for machine screw jacks
• Zippered boots
• Boots for extreme temperatures (-40ºF – 500ºF)
• Boots for corrosive atmospheres
• Boots for bevel gear jacks and bevel ball actuators

A B C - Collar Diameter D - Collar Diameter
Jack
O.D.
Collar
Capacity of Boot Diameter ACME Nut Ball Nut Machine Screw
Jacks Only**
250/500 Lb. 3 2 5/16 2 1/4 1
1,000 Lb. 3 2 5/16 2 1/4 1
1 Ton 5 2 3/4 3 1/4 2 5/8 1 1/2
2 Ton 5 3 3/4 3 1/4 3 1/4 1 1/2
3 Ton 5 1/2 3 3/4 3 1/4 2
5 Ton 5 1/2 4 3/4 4 4 15/16 2
10 Ton 6 1/2 5 3/4 6 5 3/8 3
15 Ton 6 1/2 5 3/4 6 1/2 3 1/2
20 Ton 6 1/2 6 7 1/2 5 3/8 3 3/4
25 Ton 8 7 1/2 8 1/2 4 1/2
30 Ton 8 8 1/4 7 3/8 7 3/8 4 1/2
35 Ton 10 8 1/2 9 5
50 Ton 10 11 5/8 10 9 3/4 6
75 Ton 13 13 1/2 12 7
100 Ton 14 1/2 15 12 3/4 8
**Boot collars do not fit small end of ball nuts.
Note: Drawings are artist’s conception — not for certification; dimensions are subject to change without notice.

172 joycedayton.com Custom products are available • Contact Joyce/Dayton with your requirements 800-523-5204
sales@joycedayton.com