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GN 411.2
Centering Bore Clamps
GN 411.2-K
Centering Bore Clamps
With clamping balls
GN 411.2-S
Centering Bore Clamps
With clamping segments
Description
Specification
Types
- Type K: With clamping balls
- Type S: With clamping segments
Steel
- Hardened
- Blackened
Clamping balls / segments
- Hardened
- Plain, tumbled
Information
With centering bore clamps GN 411.2 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) with type K
- Distortion free clamping
- Reduced height
- Can be fitted in any position
- Large adjustable range
- Draw-down clamping
On request
- Centering bore clamps GN 411.3, operable from the opposite side respectively for hydraulic or pneumatic operation
- Centering bore clamps with 2 clamping elements for clamping tubes
Technical information
- ISO-Fundamental TolerancesÂ
Centering Bore Clamps continued
Dimensions
 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 centring clamp and bore of the workpiece.
Type K (with balls) is used for clamping applications where minute ball marks at the contact points with the workpiece are acceptable. Type S (with clamping segments) is used in such cases where marks at the clamping points on the workpiece would be acceptable.
 GN 411.2-K
| d1 | d2 | d3 | d4 | d5 | d6 | h1 | h2 | k ±0.1 | l1 | l2 | l3 | t min. | w1 | w2 | Number of clamping elements |
Clamping force in kN |
 |
||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Code | Actions | ||||||||||||||||||
| GN 411.2-11,7-K | 11.7 | 14.2 | 10 | M 4 | 4.3 | 1.5 | 3.5 | 2.5 | 3.5 | 3.9 | 8.6 | 6.3 | 4 | 0.7 | 1.3 | 3 | 0.5 | 12 |
|
| GN 411.2-14,5-K | 14.5 | 18.5 | 12 | M 4 | 4.3 | 2 | 5.5 | 3.5 | 4.5 | 9.8 | 14.2 | 5 | 6 | 1.2 | 2.3 | 3 | 3.5 | 20 |
|
| GN 411.2-18,5-K | 18.5 | 22.5 | 15 | M 5 | 5.3 | 2.5 | 7.5 | 3 | 5.5 | 11.5 | 16.5 | 6.2 | 7 | 1.2 | 2.3 | 3 | 4 | 39 |
|
| GN 411.2-22,5-K | 22.5 | 26.5 | 20 | M 6 | 6.4 | 3 | 6 | 4 | 7 | 14.1 | 19.6 | 9 | 8 | 1.2 | 2.3 | 3 | 4.5 | 39 |
|
| GN 411.2-26,5-K | 26.5 | 30.5 | 20 | M 6 | 6.4 | 3 | 6 | 4.5 | 7 | 14.1 | 19.8 | 9 | 8 | 1.2 | 2.3 | 3 | 4.5 | 86 |
|
| GN 411.2-30,5-K | 30.5 | 38.5 | 25 | M 6 | 6.4 | 4 | 7 | 4.5 | 9 | 14.1 | 23.2 | 9 | 8 | 2.3 | 4.6 | 3 | 4.5 | 125 |
|
| GN 411.2-38,5-K | 38.5 | 46.5 | 30 | M 8 | 8.4 | 4 | 7.5 | 4.5 | 11 | 18 | 27.2 | 12 | 10 | 2.3 | 4.6 | 6 | 6.5 | 233 |
|
| GN 411.2-46,5-K | 46.5 | 54.5 | 30 | M 8 | 8.4 | 4 | 7.5 | 4.5 | 11 | 18 | 27.1 | 12 | 10 | 2.3 | 4.6 | 6 | 6.5 | 323 |
|
| GN 411.2-54,5-K | 54.5 | 70.5 | 45 | M 10 | 10.5 | 5 | 9 | 5.5 | 15 | 23.7 | 40.6 | 14 | 12 | 4.7 | 9.2 | 6 | 8 | 653 |
|
| GN 411.2-70,5-K | 70.5 | 86.5 | 60 | M 12 | 13 | 5 | 10 | 5.5 | 17 | 28.3 | 46.1 | 17 | 15 | 4.7 | 9.2 | 6 | 10 | 1271 |
|
| GN 411.2-86,5-K | 86.5 | 102.5 | 60 | M 16 | 17 | 5 | 10 | 5.5 | 25 | 30.3 | 51.2 | 21 | 15 | 4.7 | 9.2 | 6 | 12.5 | 1783 |
|
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