NSK TOUGH STEEL BEARINGS EXTENDED-LIFE SPHERICALS FOR CONVEYOR APPLICATIONS Outstanding Toughness, Performance, and Longer Life in Contaminated Applications
Success Stories Heavy contamination in a coal mining head pulley was causing bearing failures every 18 months leading to lost production and increased maintenance time. NSK Tough Steel bearings were installed and extended the bearing life to over 6 years. Documented Cost Savings: $5,050,880 Application: Overland Conveyor Head Pulley 4x life over standard material Similar conditions at a neighboring mine lead to the installation of NSK Tough Steel bearings. These bearings lasted over 4 years. Documented Cost Savings: $3,367,250 Application: Overland Conveyor Head Pulley 2.25x life over standard material
Application Contamination Issues Whether in a mine, aggregate, cement, or power plant, bearings in conveyor applications often need to operate in heavily contaminated and harsh working conditions. Head and tail pulley applications typically use cast iron SAF housing with spherical rolling bearings. Combatting Contamination NSK Tough Steel (TF) proprietary metallurgy technology extends the life of the bearing by fighting contamination. TF sphericals are available with a variety of sealing options depending on the level of contamination and protection needed.
Bearing Features Improve Bearing Life in Contaminated Conditions with Tough Steel Contamination is the leading cause of premature bearing failure. In testing, NSK s Tough Steel has conclusively proven its longevity with up to 10x life in contamination, 5.5x life in poor lubrication, and 2x life in clean conditions. The microstructure of Tough Steel prevents contamination indentations from creating flaking and spalling. Step 1 Indentation Stress concentration Step 2 Cracks Stress Rolling direction Step 3 Flaking NSK TF Steel bearing r Conventional bearing NSK TF steel mitigates sharp edges (r), caused by debris denting, that lead to high concentrations of stress and eventual flaking and spalling. Sealed HTF Bearings for Extreme Environments* NSK s unique seal design allows for removal of the seal for clearance measurement. Combined with Tough Steel technology, this bearing has an increased load rating to maximize life and minimize downtime. Garter spring NSK adopts the garter spring on the seal in order to keep constant pressure on the seal lip which can compensate for misalignment. Seal holder NSK adopts a removable seal holder which allows you to check the bearing residual clearance after mounting using a feeler gauge. *Available in limited 231 and 222 sizes. Contact NSK for inquiries outside of 231 and 222 series.
Split Housing Features NSK split housings are available with a variety of seals to combat contamination and high speed applications. Standard housings are made of cast iron, however ductile and steel are available for tough environments. LER LERDC PER TEROS Max Speed Same as bearing s limiting speed 8 m/s Same as bearing s limiting speed 7 m/s Grease Lubrication Oil Lubrication Friction Torque Temperature Range Same as bearing range -40 thru 220 O F 220 O F max -40 thru 220 O F Dust Performance Large Particles Water SAF Grease Fill and Cap Bolt Information Cap Bolts Initial Lube Fill (oz) SAF 2-Bolt SAF 4-Bolt Bolt Size Qty T (Ft-lbs) Low Spd (1) Hi Spd (2) SAF509 3/8-16UNC x 2 2 26 2.2 1.8 SAF510 3/8-16UNC x 2 2 26 2.8 2.0 SAF511 1/2-13UNC x 2-1/4 2 50 3.7 2.5 SAF513 FSAF513 1/2-13UNC x 2-1/4 2 50 6.5 4.0 SAF515 FSAF515 1/2-13UNC x 2-1/4 2 50 8.3 5.0 SAF516 FSAF516 1/2-13UNC x 2-1/4 4 50 10.0 6.0 SAF517 FSAF517 1/2-13UNC x 3 4 50 12.0 7.0 SAF518 FSAF518 1/2-13UNC x 3 4 50 16.0 7.5 SAF520 FSAF520 5/8-11UNC x 3-1/2 4 100 23.0 15.0 SAF522 5/8-11UNC x 3-1/2 4 100 31.0 20.0 SAF524 5/8-11UNC x 4 4 100 37.0 22.0 SAF526 3/4-10UNC x 4-1/2 4 175 40.0 28.0 SAF528 3/4-10UNC x 4-1/2 4 175 52.0 32.0 SAF530 3/4-10UNC x 5 4 175 62.0 34.0 SAF532 3/4-10UNC x 5 4 175 75.0 40.0 SAF534 1-8UNC x 6-1/2 4 245 90.0 55.0 SAF536 1-8UNC x 6-1/2 4 245 120.0 65.0 SAF538 1-8UNC x 6-1/2 4 245 150.0 75.0 SAF540 1-8UNC x 7 4 245 200.0 85.0 SAF544 1-8UNC x 7-1/2 4 245 250.0 125.0 For other Series SAF Blocks, contact NSK. (1) Low speed applications generally involve conveyors. Bearings exposed to weather are better off relatively full to deter moisture from entering. (2) Higher speed applications do not require as much grease, as purging of excess will occur at the seals naturally.
Worldwide Sales Offices NSK Ltd. Headquarters, Tokyo, Japan www.nsk.com Asia Business Strategic Division- Headquarters tel: 81-03-3779-7145 Industrial Machinery Bearings Division- Headquarters tel: 81-03-3779-7227 Automotive Division-Headquarters tel: 81-03-3779-7189 Needle Roller Bearings Strategic tel: 81-03-3779-2563 Division-Headquarters Precision Machinery & Parts tel: 81-03-3779-7219 Division-Headquarters Africa South Africa: NSK South Africa (Pty) Ltd. Johannesburg tel: 27-011-458-3600 Asia and Oceania Australia: NSK Australia Pty. Ltd. www.nskaustralia.com.au Melbourne tel: 61-03-9764-8302 China: NSK Hong Kong Ltd. Hong Kong tel: 86-2739-9933 Kunshan NSK Co., Ltd. Kunshan Plant tel: 86-0520-730-5654 Changshu NSK Needle Bearing Co., Ltd. Jiangsu Plant tel: 86-0512-5230-1111 Guizhou HS NSK Bearings Co., Ltd. Anshun Plant tel: 86-0853-3521505 NSK Steering Systems Dongguan Co., Ltd. Dongguan Plant tel: 86-0769-262-0960 Zhangjiagang NSK Precision Machinery Co., Ltd. Jiangsu Plant tel: 86-0512-5867-6496 Timken-NSK Bearings (Suzhou) Co., Ltd. Jiangsu Plant tel: 86-0512-6665-5666 NSK China Technology Center Jiangsu tel: 86-0512-5771-5654 NSK (Shanghai) Trading Co., Ltd. Shanghai tel: 86-021-6235-0198 Beijing tel: 86-010-6590-8161 Guangzhou tel: 86-020-3786-4833 Anshun tel: 86-0853-3522522 Chengdu tel: 86-028-8661-4200 Shenzhen tel: 86-0755-25904886 Changchun tel: 86-0431-8988682 NSK (China) Investment Co., Ltd. Shanghai tel: 86-021-6235-0198 India: Rane NSK Steering Systems Ltd. Chennai tel: 91-044-274-66002 NSK Ltd. India Branch Office Chennai tel: 91-044-2446-6862 Indonesia: PT. NSK Bearings Manufacturing Indonesia Jakarta tel: 62-021-898-0155 PT. NSK Indonesia Jakarta tel: 62-021-252-3458 Korea: NSK Korea Co., Ltd. www.kr.nsk.com Seoul tel: 82-02-3287-0300 Changwon Plant tel: 82-055-287-6001 Malaysia: NSK Bearings (Malaysia) Sdn. Bhd. Kuala Lumpur tel: 60-03-7722-3372 NSK Micro Precision (M) Sdn. Bhd. Malaysia Plant tel: 60-03-961-6288 New Zealand: NSK New Zealand Ltd. www.nsk-rhp.co.nz Auckland tel: 64-09-276-4992 Philippines: NSK Representative Office Makati City tel: 63-02-893-9543 Singapore: NSK International (Singapore) Pte Ltd. Singapore tel: 65-6496-8000 NSK Singapore (Pte) Ltd. www.nsk-singapore.com.sg Singapore tel: 65-6496-8000 Taiwan: Taiwan NSK Precision Co., Ltd. Taipei tel: 886-02-2509-3305 Thailand: NSK Bearings (Thailand) Co., Ltd. Bangkok tel: 66-02-6412-150 SIAM NSK Steering Systems Co., Ltd. Chachoengsao tel: 66-038-522-343~350 NSK Asia Pacific Technology Center (Thailand) Co., Ltd. Chonburi tel: 66-038-454631~454633 Vietnam: NSK Representative Office Hanoi tel: 84-04-935-1269 Europe NSK Europe Ltd. (European Headquarters) www.eu.nsk.com Maidenhead, U.K. tel: 44-01628-509800 France: NSK France S.A.S Paris tel: 33-01-30-57-39-39 Germany: NSK Deutschland GmbH Düsseldorf tel: 49-02102-481-0 NSK Steering Systems Europe Ltd. Stuttgart tel: 49-0771-79082-277 Neuweg Fertigung GmbH Munderkingen tel: 49-07393-540 Italy: NSK Italia S.p.A. Milano tel: 39-02-995-19-1 Industria Cuscinetti S.p.A. Torino Plant tel: 39-0119824811 Netherlands: NSK European Distribution Centre B.V. Tilburg tel: 31-013-4647647 Poland: NSK Polska Sp. z.o.o. Warsaw Branch tel: 48-022-645-1525 NSK Iskra S.A. Kielce tel: 48-041-366-6111 NSK European Technology Center, Poland Office Kielce tel: 48-041-366-5812 Spain: NSK Spain S.A. Barcelona tel: 34-093-289-27-63 Turkey: NSK Rulmanlari Orta Dogu Tic. Ltd Sti tel: 90-0216-442-7106 United Kingdom: NSK Bearings Europe Ltd. Peterlee Plant tel: 44-0191-586-6111 NSK European Technology Centre Newark tel: 44-01636-605123 NSK UK Ltd. Newark tel: 44-01636-605123 NSK Steering Systems Europe Ltd. Coventry tel: 44-024-76-337100 North and South America NSK Americas, Inc. (American Headquarters) Ann Arbor tel: 1-734-913-7500 Argentina: NSK Argentina SRL Buenos Aires tel: 54-011-4762-6556 Brazil: NSK Brasil Ltda. www.br.nsk.com São Paulo tel: 55-011-3269-4700 Canada: NSK Canada Inc. www.ca.nsk.com Toronto tel: 1-905-890-0740 Mexico: NSK Rodamientos Mexicana, S.A. de C.V. www.mx.nsk.com Mexico City tel: 52-55-36822900 United States of America: NSK Corporation www.nskamericas.com Ann Arbor tel: 1-734-913-7500 NSK American Technology Center Ann Arbor tel: 1-734-913-7500 NSK Precision America, Inc. www.nskamericas.com Franklin tel: 800-255-4773 NSK Steering Systems America, Inc. www.nssa.nsk.com Bennington, Vermont tel: 1-802-442-5448 NSK Latin America, Inc. www.la.nsk.com Miami tel: 1-305-477-0605 NSK Ltd. has a basic policy not to export any products or technology designated as controlled items by export-related laws. When exporting the products in this brochure, the laws of the exporting country must be observed. Specifications are subject to change without notice and without any obligation on the part of the manufacturer. Every care has been taken to ensure the accuracy of the data contained in this brochure, but no liability can be accepted for any loss or damage suffered through errors or omissions. We will gratefully acknowledge any additions or corrections. Conveyors/AB/1M15. Printed in the USA NSK 2015. The contents of this publication are the copyright of the publishers.