1. Classification of bearings
The first number from left to right or the first and second numbers added together: "6" means deep groove ball bearing (category 0), "4" means double row deep groove ball bearing (category 0), " 2" or "1" means spherical ball bearings (the basic model has four numbers in total) (category 1), "21", "22", "23" and "24" means spherical roller bearings. (Category 3), "N" means cylindrical roller bearings (including short cylindrical rollers and part of slender needle rollers) (Category 2), "NU" inner ring without ribs, "NJ" inner ring with single ribs, "NF" has a single outer ring, "N" has no ribs in the outer ring, "NN" has double row cylindrical rollers and has no ribs in the outer ring, and "NNU" has double row cylindrical rollers and has no ribs in the inner ring. The roller length is at least 5 times the diameter, which is called a needle roller bearing (category 4), "NA" turned outer ring needle roller bearing, "NK" stamped shell needle roller bearing, K" needle roller and cage assembly , without inner and outer rings. "7" represents angular contact ball bearings (category 6), "3" represents tapered roller bearings (metric) (category 7), "51", "52" and "53" represent radial thrust ball bearings (category 7). The basic model has five numbers) (category 8), "81" indicates thrust short cylindrical roller bearing (category 9), "29" indicates thrust spherical roller bearing (category 9)
2. Standarde naționale pentru rulmenți
GB-T 305-1998 Dimensions and tolerances of stop grooves and stop rings on the outer ring of rolling bearings
GB-T 308-2002 Laminare rulment otel bile
GB-T 309-2000 Laminare rulment ac rola
GB-T 4661-2002} laminare rulmenti cilindrici role
GB-T 4662-2003 Rolling bearings static load rating
GB-T 6391-2003} Rulare rulmenți dinamică sarcină evaluare și evaluat viață
JB-T 3034-1993} laminare rulment ulei etanșare antirugină ambalaj
JB-T 3573-2004 Rolling bearings - Measurement method of radial clearance
JB-T 6639-2004} laminare rulment piese schelet nitril cauciuc etansare inel tehnic conditii
JB-T 6641-2007} laminare rulmenți reziduu magnetism și its evaluare metodă
JB-T 6642-2004} laminare rulment piese - măsurare și evaluare metodă de rotunjime și ondulare erori
JB-T 7048-2002 Laminare rulment piese Inginerie plastic cușcă
JB-T 7050-2005 Rolling bearing cleanliness assessment method
JB-T 7051-2006} laminare rulment piese suprafata rugozitate masurare si evaluare metode
JB-T 7361-2007 laminare rulment piese duritate test metodă
JB-T 7752-2005} Laminare rulment etanșat adânc canel bilă rulment tehnic condiții
JB-T 8196-1996} Rulare rulmenți Rulare element reziduu magnetism și its evaluare metodă
JB-T 8571-1997 Rulare rulmenți, etanșat adânc canel bilă rulmenți, rezistent la praf, unsoare scurgere, temperatură creștere performanță test proceduri
JB-T 8921-1999 Inspecție norme pentru laminare rulmenți și lor piese
JB-T 10336-2002 Supplementary technical conditions for rolling bearings and their parts
JB-T 50013-2000 laminare rulment viata si fiabilitate test proceduri
JB-T 50093-1997 Laminare rulment viață și fiabilitate test evaluare metodă
