PLUMMER BLOCKS AND ACCESSORIES
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PLUMMER BLOCKS AND ACCESSORIES –

As one of the world’s leading manufacturers of rolling bearings, linear technology components and steering systems, we can be found on almost every continent – with production facilities, sales offices and technology centres – because our customers appreciate short decision-making channels, prompt deliveries and local service. Oceania Africa The NSK company NSK commenced operations as the first Japanese manufacturer of rolling bearings back in 1916. Ever since, we have been continuously expanding and improving not only our product portfolio but also our range of services for various...

Partnership based on trust – and trust based on quality Total Quality by NSK: The synergies of our global network of NSK Technology Centres. Just one example of how we meet our requirements for high quality. NSK is one of the leading companies with a long tradition in patent applications for machine parts. In our worldwide research centres, we not only concentrate on the development of new technologies, but also on the continual improvement of quality based on the integrated technology platform of tribology, material technology, analysis and mechatronics. More about NSK at www.nskeurope.com...

PLUMMER BLOCKS AND ACCESSORI

SNN Series Plummer Blocks Threaded holes designed to also be used for condition monitoring sensors + 1 grease nipple as standard High-grade bolts Seal groove for various types of seals Split seal, v-ring seal, labyrinth seal Dimples for additional holes These can be utilised for sensors or lubrication holes for the seal or bearing High-grade casting iron Very tough material Dimples for four mounting bolt holes Ideally shaped stiffer design Square-shaped base Facilitates alignment Draining hole as standard Dimples for positioning pins Webs for heat transfer Rib for bearing seat Prevents...

High-performance SNN Series plummer blocks are highly rigid and easy to handle. They can be equipped with NSK’s tough spherical roller bearings, which have high load capacity, low temperature rise and high-strength cages. The SNN range of split plummer blocks is the latest technical evolution from NSK Whatever your application and whichever sector you work in (cement, mining and quarrying, air treatment, water treatment, conveying equipment, crushing equipment, etc.), you will find that NSK’s SNN split housing range and bearings offer the best solution for your specific needs. Easy and...

Modular SNN Housing Range Our modular SNN housing range offers various technical options to match the needs of the most demanding applications. The components are easy to fit, remove and maintain. Equipped with NSK high performance bearings, SNN split housings will support you in achieving your cost reduction plans. Same housing can be used with both double row self-aligning ball bearings or NSKHPS double row spherical roller bearings NSKHPS Spherical Roller Bearings Pressed Steel Cage (EA-series) › Higher limiting speeds – up to 20 % max. › Special surface treatment › Bore diameter...

Self Aligning Ball Bearings › Double row bearings with a spherical outer ring raceway › Angle adjustment › Suitable for compensating for angular misalignment › Cylindrical and tapered bores › Cages of these bearings are normally made of glass-fibre reinforced Polyamide 66 Standards, dimensions The external dimensions of Self Aligning Ball Bearings are laid down in ISO R15 or DIN 630. Tolerances The bearings are only manufactured to the standard tolerance P0. Bearing clearance Self Aligning Bearings with cylindrical bores are normally manufactured with standard radial clearance C0 and those...

Housing Features – Designation The plummer block housings detailed in this brochure are manufactured in accordance with ISO/R113 standards. Bearing Nomenclature Example: Housing design code Size Size Housings Features › Colour: RAL 7001, Pantone 444C › Housing Material: Cast Iron Grade 200 › Cap bolts: Mild steel AISI1010 Grade 8.8 › Metal plugs: Mild steel AISI 1010 › Tolerance of bearing seating: H7 › The bearing seating is protected against corrosion, all the non machined internal parts are primed. › Each housing is supplied with a straight grease nipple (see dimensions in the...

Typical Arrangements of Plummer Blocks Plummer blocks typical arrangement Fig. 1 Fig.1: In the fixed plummer block, to prevent axial displacement of the bearing, 2 locating rings are installed, one on either side of the bearing. Locating rings are manufactured in aluminium. Fig.2: One bearing should be free to move axially. This plummer block should not be assembled with locating rings. How to order SNN complete Plummer Blocks from NSK Example 1 – Application with 2 plummer blocks Example 2 – Application with 2 plummer blocks Free end Through shaft diam 50 mm, equiped with 1 spherical...

Breaking Loads for SNN Housings Cap bolt material: Grade 8.8 Reference values only

Cap & Fixing Bolts Sizes – Recommended Tightening Torques Cap Bolt Size Grade 8.8 Recommended max. Tightening Torque (lubricated) Base Bolts Size Grade 8.8 Recommended max. Tightening Torque (lubricated) Nm PLUMMER BLOCKS AND ACCESSORIES – SNN SERIES AND SD SERIES 1

SNN Standard Sealing Arrangements There are several different types of seal designs for the use in SNN housings. Many alternative choices are available to the user to ensure that the most suitable solution will be found to meet a wide range of application conditions. Mild steel + Wool & Rayon Grease Lubrication Seal Type Material Low Friction Torque Axial Shaft Displacement Performance when exposed to: Dust Large Particles 4 halves, to equiped both sides of the housing 4 NBR o-rings, 4 halves/steel adapters, 4 felt strips, to equip both sides of housing Remarks (1) With grease lubrication...

TACK Seals TACK Type Performance when exposed to: Excellent 2 NBR v-rings, mild steel + NBR plates, to equip both sides of the housing 1 cast iron labyrinth + 1 NBR o-ring, to equip 1 side of the housing 1 cast iron labyrinth 2 NBR o-ring, 1 NBR v-ring, 1 cast iron body and 1 grease nipple, to equipe 1 side of the housing Note End cover A (designation example: 509A) are supplied as a single item in a plastic bag (1 NBR + Mild steel plate to equip 1 side o the housing) Seals for high temperature applications can be supplied on request. For more information, please consult NSK. PLUMMER BLOCKS...