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Brand: Flender
Flender N-BIPEX Claw Coupling
Description
A compact fail-safe claw coupling for uniform drives
The Flender N-BIPEX is a universally applicable, torsionally flexible claw coupling with a very compact design. Flender’s assembly and operating instructions M3401-01 (version 02/2025) cover the types BWN, BWT and BNT and state that N-BIPEX couplings are fail-safe, so torque transmission continues through the claws if the elastomer cam ring is destroyed.
The manual says N-BIPEX couplings are suitable for drives with a uniform torque load and low misalignment. Shaft-hub connection is by cylindrical or conical bore with parallel key, or by a TAPER clamping bush with parallel key. The couplings can be used in potentially explosive atmospheres when they carry the corresponding marking.
Technical specifications
| Parameter | Specification |
|---|---|
| Types | BWN, BWT, BNT |
| Document | M3401-01en, version 02/2025 |
| Size 19 | n max 19,500 rpm; max bore 25 mm; DA 42 mm; 0.3 kg |
| Size 28 | n max 12,500 rpm; max bore 40 mm; DA 65 mm; 1.3 kg |
| Size 38 | n max 10,000 rpm; max bore 48 mm; DA 80 mm; 2.0 kg |
| Size 48 | n max 7,500 rpm; max bore 62 mm; DA 105 mm; 4.7 kg |
| Size 65 | n max 6,000 rpm; max bore 82 mm; DA 135 mm; 8.8 kg |
| Size 90 | n max 4,000 rpm; max bore 120 mm; DA 200 mm; 23.3 kg |
| Cam ring materials | TPU 92 Shore A red (standard, soft); TPU 95 Shore A green (medium); TPU 64 Shore D blue (hard); -50 to +100 C |
| Misalignment | Permitted values per size at 1,500 rpm with correction factor 1.2 at 500 rpm, 1.1 at 1,000 rpm, 1.0 at 1,500 rpm and 0.7 at 3,000 rpm |
| ATEX marking | II 2G Ex h IIB T6…T4 Gb X; II 2D Ex h IIIC T85 C…120 C Db X; I M2 Ex h Mb X (explosion groups IIA and IIB) |
| Standard types listed | Size 19, 24, 28, 38, 42, 48, 55, 65, 75, 90 for BWN (weights apply to maximum bore) |
Choosing the cam ring and bore
The cam ring sets the torsional stiffness: the red 92 Shore A ring is the standard soft choice, the green 95 Shore A ring shifts the resonant speed, and the blue 64 Shore D ring is the hard version. Bores use DIN 6885-1 keyways and some TAPER clamping bush bores need a flat groove, listed by bush number in the manual. Weights in the tables are for one coupling half with maximum bore. Misalignment limits are computed from the speed correction factor and the size values, so the actual operating speed must be stated.
Ordering notes
Give the type (BWN, BWT or BNT), size, both shaft diameters and keyways, torque and speed, cam ring hardness and any ATEX requirement. For a pairing with a gear unit see the published Flender ONE gear unit; couplings are grouped in Electric Motors.
Documents and quotation
The Flender document is attached. Seven Star LLC supplies Flender couplings on request and quotes against the exact type, size and bore. The attached document is the manufacturer’s assembly and operating manual with dimension and speed tables.
Datasheets & Documents
- Datasheet Flender N-BIPEX assembly and operating instructions M3401-01en (02/2025) Download
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About brand
Large industrial gearboxes are the product most engineers associate with Flender, a company founded in 1899 and based in Bocholt, Germany, that builds gear units, couplings and drive systems. Seven Star LLC sources and supplies Flender gear units and their spare parts for mills, conveyors, pumps and marine drives in Oman, working from the nameplate data. On some nameplates the name appears as Siemens Flender.
Flender gearbox types listed here
Four items are listed. Flender ONE is the manufacturer's redesigned single-stage helical gear unit. The H2SV 09 is a two-stage helical gear unit of size 09 with a solid output shaft, shown here with a cooling coil and oil tank. The NAVILUS line covers marine gearboxes, listed in a multiple-input, single-output arrangement that brings several engines onto one propeller shaft, and in a version for dredgers. Flender couplings such as the flexible N-EUPEX type are often ordered with a gear unit.
Ordering a Flender gearbox or parts: what we need
Send a photo of the nameplate showing type, size, serial or order number, ratio, power and speeds. For spares, the serial number lets the parts list be traced, so add the item number of the bearing, seal or gear set you need. For a new unit, give the driven machine, motor power and speed, output speed, mounting position, shaft arrangement, ambient temperature and cooling method. Marine and dredger gearboxes for GCC yards also need the class society.
Browse Flender products by category: Electromotors, Electric Motors & Pumps.
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Frequently Asked Questions
Which types does the manual cover?
BWN, BWT and BNT.
Is the N-BIPEX fail-safe?
Yes, the manual states that N-BIPEX couplings are fail-safe.
What cam ring options exist?
TPU 92 Shore A red, 95 Shore A green and 64 Shore D blue, for -50 to +100 C.
What drives is it suited to?
Drives with uniform torque load and low misalignment, per the manual.
How are hubs fixed to shafts?
Cylindrical or conical bore with parallel key, or a TAPER clamping bush with parallel key.
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