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NTB SERIES - TRIANGLE FLANGE MOUNT NTB SERIES - ROUND FLANGE MOUNT NTB SERIES - THREAD MOUNT

NTB SERIES ANTI-BACKLASH NUTS - Full Range, Flexible Designs

Part Number Construction

Kerk NTB Anti-backlash Nut Assembly – 303 Stainless Steel Acme Lead Screw

The Kerk® NTB Series anti-backlash acme lead screw assembly is designed for higher load applications than the ZBX or KHD series units. Using the patented take up mechanism, it maintains axial stiffness throughout its life while system drag torque is held to a minimum. The need to highly pre-load the nut to compensate for load has been eliminated with the Kerk NTB Series nut assembly.

The nut is manufactured with a self-lubricating polyacetal designed to run efficiently on the precision rolled acme lead screw. Screws are 303 stainless and are available with our proprietary, long-life Kerkote® TFE coating. The NTB's simple, compact design can be easily modified for custom applications.

The NTB assembly provides low drag torque, high system stiffness, smooth operation, and long life throughout its load and speed range.

LEAD SCREWS | COMPARISON CHART | SCREW SIZE LIST | NUT FEATURE MATRIX | NUT STYLES
 
NTB SERIES: TRIANGULAR FLANGE MOUNT
 

Screw Ø

Nut Ø

Nut Length

Flange Ø

Flange Thickness

Mount Hole Ø

Bolt Circle Ø

Hub Width

Hub Ø

Dynamic Load

Drag Torque

CAD Model

A
in.
(mm)

B
in.
(mm)

C
in.
(mm)

D
in.
(mm)

E
in.
(mm)

F
in.
(mm)

G
in.
(mm)

H
in.
(mm)

J
in.
(mm)


lbs.
(kg)


oz.-in.
(Nm)

 

1/4
(6)

.52
(13.2)

1.1
(28)

1.00
(25.4)

.16
(4.0)

.143
(3.63)

.750
(19.1)

.08
(2.0)

.500
(12.7)

10
(4.5)

.5-2
(.004-.014)

Download

5/16
(8)

.80
(20.3)

1.8
(46)

1.50
(38.1)

.20
(5.1)

.200
(5.08)

1.125
(28.6)

.10
(2.54)

.750
(19.1)

20
(9.1)

1-3
(.007-.02)

3/8
(10)

.80
(20.3)

1.8
(46)

1.50
(38.1)

.20
(5.1)

.200
(5.08)

1.125
(28.6)

.10
(2.54)

.750
(19.1)

20
(9.1)

1-3
(.007-.02)

7/16
(11)

.90
(22.9)

1.8
(46)

1.62
(41.2)

.23
(5.7)

.200
(5.08)

1.250
(31.8)

.10
(2.54)

.875
(22.2)

30
(13.6)

1-3
(.007-.02)
 

Outline Drawing – Kerk Acme Lead Screw Assembly with NTB Triangle Flange Mount Anti-backlash Nut
 
 
NTB SERIES: ROUND FLANGE MOUNT
 

Screw Ø

Nut Ø

Nut Length

Flange Ø

Flange Thickness

Mount Hole Ø

Bolt Circle Ø

Hub Width

Hub Ø

Dynamic Load

Drag Torque

CAD Model

A
in.
(mm)

B
in.
(mm)

C
in.
(mm)

D
in.
(mm)

E
in.
(mm)

F
in.
(mm)

G
in.
(mm)

H
in.
(mm)

J
in.
(mm)


lbs.
(kg)


oz.-in.
(Nm)

 

1/2
(13)

1.06
(26.9)

2.1
(54)

1.75
(44.5)

.25
(6.4)

.220
(5.59)

1.406
(35.71)

.12
(3.0)

1.00
(25.4)

100
(45.5)

2-6
(.014-.04)

Download

5/8
(16)

1.38
(34.9)

2.3
(59)

2.13
(54.1)

.28
(7.0)

.220
(5.59)

1.750
(44.45)

.10
(2.54)

1.25
(31.8)

125
(56.8)

2-6
(.014-.04)

3/4
(19)

1.56
(39.6)

2.7
(67)

2.38
(60.5)

.31
(7.9)

.220
(5.59)

2.000
(50.80)

.10
(2.54)

1.50
(38.1)

150
(68.2)

3-7
(.02-.05)

7/8
(22)

1.75
(44.5)

2.8
(70)

2.63
(66.8)

.38
(9.5)

.220
(5.59)

2.250
(57.15)

.12
(3.0)

1.75
(44.5)

200
(90.9)

4-8
(.03-.06)

15/16
(24)

1.75
(44.5)

2.8
(70)

2.63
(66.8)

.38
(9.5)

.220
(5.59)

2.250
(57.15)

.12
(3.0)

1.75
(44.5)

200
(90.9)

4-8
(.03-.06)

 

Outline Drawing – Kerk Acme Lead Screw Assembly with NTB Round Flange Mount Anti-backlash Nut

 

 NTB SERIES : THREAD MOUNT - 1/4 to 7/16-in

Screw Ø

Nut Ø

Nut Length

Thread

Thread Length

Dynamic Load

Drag Torque

CAD Model

A
in.
(mm)

B
in.
(mm)

C
in.
(mm)

M
in.

N
in.
(mm)


lbs.
(kg)


oz.-in.
(Nm)

 

1/4
(6)

.52
(13.2)

1.1
(28)

7/16-20
 

.25
(6.4)

10
(4.5)

.5-2
(.004-.014)

Download

5/16
(8)

.80
(20.3)

1.8
(45)

3/4-20
 

.38
(9.5)

20
(9.1)

1-3
(.007-.02)

3/8
(10)

.80
(20.3)

1.8
(45)

3/4-20
 

.38
(9.5)

20
(9.1)

1-3
(.007-.02)

7/16
(11)

.90
(22.9)

1.8
(46)

13/16-16
 

.38
(9.5)

30
(13.6)

1-3
(.007-.02)

 NTB SERIES : THREAD MOUNT - 1/2 to 15/16-in

Screw Ø

Nut Ø

Nut Length

Thread

Thread Length

Dynamic Load

Drag Torque

CAD Model

A
in.
(mm)

B
in.
(mm)

C
in.
(mm)

M
in.

N
in.
(mm)


lbs.
(kg)


oz.-in.
(Nm)

 

1/2
(13)

1.06
(26.9)

2.1
(54)

15/16-16
 

.38
(9.5)

100
(45.5)

2-6
(.014-.04)

Download

5/8
(16)

1.38
(34.9)

2.3
(59)

1 1/8-16
 

.38
(9.5)

125
(56.8)

2-6
(.014-.04)

3/4
(19)

1.56
(39.6)

2.7
(67)

1 3/8-16
 

.50
(12.7)

150
(68.2)

3-7
(.02-.05)

7/8
(22)

1.75
(44.5)

2.8
(70)

1 9/16-16
 

.50
(12.7)

200
(90.9)

4-8
(.03-.06)

15/16
(23.81)

1.75
(44.5)

2.8
(70)

1 9/16-16
 

.50
(12.7)

200
(90.9)

4-8
(.03-.06)

 

 

Outline Drawing – Kerk Acme Lead Screw Assembly with NTB Threaded Anti-backlash Nut