Metric Size,
Centering Bore Clamps


GN 411.2

 

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Specification
Information

Clamp body: Steel, hardened and blackened
Clamping balls/segments: Hardened, blank, ground

Shipping

With GN 411.2 Centering Bore Clamps, workpieces can be centrally positioned and clamped from the inside of the bore.
They offer the following advantages:
- Precise self centering
- Repetitive accuracy: ± 0.025
- Accuracy of concentricity: ± 0.05
- Solid and stable clamping through either 3 or 6 contact points on the workpiece
- Clamping of workpieces with uneven or irregular surface (such as castings)
- Distortion free clamping
- Reduced height
- Can be fitted in any position
- Large adjustable range
- Draw-down clamping

 
 

Operating Principle

A circular ball cage containing 3 or 6 balls is forced outwards over an accurately guided cone by means of a screw which, through the exerted thrust, will enlarge the outside diameter of the circular ball cage. This in turn will lead to a firm contact between the centering clamp and the bore of the workpiece.

Type K (with balls) is used for clamping applications where tiny ball marks at the contact points with the workpiece are acceptable. Type S (with clamping segments) is a non-marking type, and is used in applications where marks at the clamping points are unacceptable.

 
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Dimensions in:

millimeters
(inches)

Part Number d1

ds
Clamping Dia.

d2 d3 d4 d5 h1 h2 k +/- 0.1 mm l1 l2 l3 t min. No. of Clamp- ing Points Clamp- ing Force (kN)
Type K with Clamping Balls Type S with Clamping Segments min. max. min. max. min. max.
411.2-11.7-K
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-- 11.7
(.46)
11.7
(.46)
14.2
(.56)
10
(.39)
M4 x .7 3.3
(.13)
1.5
(.06)
3.5
(.14)
2.5
(.10)
3.5
(.14)
3
(.12)
4
(.16)
8.5
(.33)
10
(.39)
3.5
(.14)
6
(.24)
3 .5
411.2-14.5-K
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411.2-14.5-S
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14.5
(.57)
14.5
(.57)
18.5
(.73)
12
(.47)
M4 x .7 4.3
(17)
.2
(.08)
5.5
(.22)
3.5
(.14)
4.5
(.18)
7.9
(.31)
9.5
(.37)
11.8
(.46)
14
(.56)
5.6
(.22)
6
(.24)
3 3.5
411.2-18.5-K
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411.2-18.5-S
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18.5
(.73)
18.5
(.73)
22.5
(.89)
15
(.59)
M5 x .8 5.3
(.21)
2.5
(.10)
7.5
(30)
3
(.12)
5.5
(.22)
10.4
(.41)
11.6
(.46)
14.3
(.56)
16.5
(.65)
7
(.28)
10
(.39)
3 4
411.2-22.5-K
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411.2-22.5-S
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22.5
(.89)
22.5
(.89)
26.5
(1.04)
20
(.79)
M6 x 1.0 6.4
(.25)
3
(.12)
6
(.24)
4
(.16)
7
(.28)
13.9
(.55)
14.1
(.55)
17.3
(.68)
19.6
(.77)
9
(.35)
10
(.39)
3 4.5
411.2-26.5-K
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411.2-26.5-S
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26.5
(1.04)
26.5
(1.04)
30.5
(1.02)
20
(.79)
M6 x 1.0 6.4
(.25)
3
(.12)
6
(.24)
4.5
(.18)
7
(.28)
13.9
(.55)
14.1
(.55)
17.3
(.68)
19.6
(.77)
9
(.35)
10
(.39)
3 4.5
411.2-30.5-K
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411.2-30.5-S
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30.5
(1.20)
30.5
(1.20)
38.5
(1.52)
25
(.98)
M6 x 1.0 6.4
(.25)
4
(.16)
7
(.28)
4.5
(.18)
9
(.35)
12.8
(50)
14.2
(.56)
18.5
(.73)
23.1
(.91)
9.2
(.36)
12
(.47)
3 4.5
411.2-38.5-K
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411.2-38.5-S
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38.5
(1.52)
38.5
(1.52)
46.5
(1.83)
30
(1.18)
M8 x 1.25 8.4
(.33)
4
(.16)
7.5
(30)
4.5
(.18)
11
(.43)
15.7
(.62)
17.8
(.70)
22.5
(.89)
27.1
(1.07)
10.5
(.41)
13
(.51)
6 6.5
411.2-46.5-K
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411.2-46.5-S
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46.5
(1.83)
46.5
(1.83)
54.5
(2.15)
30
(1.18)
M8 x 1.25 8.4
(.33)
.4
(.16)
7.5
(30)
4.5
(.18)
11
(.43)
15.7
(.62)
18
(.71)
22.5
(.89)
27.2
(1.08)
10.5
(.41)
13
(.51)
6 6.5
411.2-54.5-K
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411.2-54.5-S
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54.5
(2.15)
54.5
(2.15)
70.5
(2.78)
45
(1.77)
M10 x 1.5 10.5
(.41)
5
(.20)
9
(.35)
5.5
(.22)
15
(.59)
19
(.75)
27.3
(.93)
31.4
(1.24)
40.6
(1.59)
13.5
(.53)
14
(.55)
6 8
411.2-70.5-K
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411.2-70.5-S
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70.5
(2.78)
70.5
(2.78)
86.5
(3.41)
60
(2.36)
M12 x 1.75 13
(.51)
5
(.20)
10
(.39)
5.5
(.22)
17
(.67)
23.6
(.93)
28.3
(1.11)
36.8
(1.45)
46.1
(1.81)
16
(.63)
16
(.63)
6 10
411.2-86.5-K
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411.2-86.5-S
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86.5
(3.41)
86.5
(3.41)
103
(4.04)
60
(2.36)
M16 x 2.0 13
(.51)
5
(.20)
10
(.39)
5.5
(.22)
17
(.67)
23.6
(.93)
30.2
(1.19)
41.7
(1.64)
51
(2.01)
16
(.63)
16
(.63)
6 12.5