Swedish SKF bearings SKF in Sweden before and after the code associated company Beijing Jing Lu Chong Trading Company
(1)SKF bearings interior design ACD - contact angle of 25 degrees. B - contact angle of 40 degrees. CC - contact angle of 12 degrees. CD - contact angle of 15 degrees. BE - contact angle of 40 degrees in the BE-type bearings, ball increase in glass fiber reinforced polyamide 6.6 cage. Double row angular contact ball bearings A - 90 mm outside diameter less than or equal to the standard design bearing no ball gap, the use of glass fiber reinforced polyamide 6.6 cage. E - ball bearing side of the mouth, can be installed more balls, so it has high radial and axial load carrying capacity. Spherical roller bearings CAC, ECAC, CA, ECA - those designed for large-size bearings, roller symmetrical type. CC, C, EC - these bearings roller symmetrical type, inner wall. E - SKF company is using the latest standard design. E-type bearing outer ring with a tank and three hole, then the post code to be added in W, to show the difference. Cylindrical roller bearings B - bearing using surface treated roller (full complement cylindrical roller bearings). B4 - roller bearing ring surface and the surfaces are treated (full complement cylindrical roller bearings). EC - bearing internal geometry improved, a higher carrying capacity, ribs and roller end contact and has good lubrication conditions, can withstand high axial loads. (
2) exterior design CA, CB, CC - Universal paired single row angular contact ball bearings, can be arbitrary (in series, face to face or back to back) paired installation. Back to back or face to face arrangement, the axial internal clearance before installation and normal ratio: Small (CA), normal (CB), the larger (CC). -2F - spherical ball bearings on both sides of the dust ring with rejection. -2FF - spherical ball bearings on both sides of the dust ring with a combination of rejection. G - General paired single row angular contact ball bearings. Face to face or back to back arrangement, the bearing has some pre-installed load. GA - face to face, back to back arrangement, the bearing pre-load lighter. GB - face to face, back to back arrangement, the bearing preload moderate. GC - face to face, back to back arrangement, bearing a heavier preload. K - tapered bore, taper 1:12. K30 - tapered bore, taper 1:30. -LS - bearing side with contact seals, no inner seal groove. -2LS - bearings on both sides with LS seal. N - bearings with snap groove on the outer ring. NR - bearings with snap groove on the outer ring and a retaining ring. N2 - outer chamfer has two diametrically opposed notches. PP - bearing (bearing roller bearings, cam follower bearings) with contact seals on both sides. RS - bearing (needle bearing) side with a synthetic rubber or polyurethane-contact seals. -RS1 - bearing side with synthetic rubber lined steel contact seals. -2RS1 - bearings on both sides with RS1 seal. -2RS - bearing (needle bearing) on both sides with RS seal. -RZ - bearing side lining plate with low-friction seal of synthetic rubber. -2RZ - bearings on both sides with RZ seal. X - 1. Basic dimensions amended to conform to the ISO standard; 2. Cylindrical rolling surface (bearing roller bearings, cam follower bearings). Z - bearing side with a dust cover (non-friction seal). -2Z - bearings on both sides with a dust cover. -ZN - bearing side with a dust cover on one side and a groove on the outer ring. -2ZN - bearings on both sides with a dust cover, the outer ring groove. -2NR - with-ZN, and with a snap ring. -2ZNR - with-2ZN, and with a snap ring. (3) In order to show the bearing retainer cage to guide the way, the cage can be added after the post code letters A or B. A represents the outer ring guided cage; B represents the cage from the inner guide. No representation cage guided by the rolling elements. F - steel or special cast iron solid cage. J - steel stamping cage. M - light alloy solid cage. MP - Solid brass cage. P - 6.6 Glass filled nylon molding cage. TN - plastic molding cage. Y - copper stamping cage. V - full roller bearings (without cage). VH - by a non-separable roller assembly consisting of full roller bearings (cylindrical roller bearings). (3) Other features 1) Tolerance class / CLN - equivalent to ISO tolerance class 6X, for metric tapered roller bearings (width tolerance has decreased). / CL0 - equivalent ISO0 grade tolerances for inch tapered roller bearings. / CL3 - equivalent ISO3 grade tolerances for inch tapered roller bearings. / CL7A - meet the standard differential bearing configuration tapered roller bearings. / CL7C - meet the standard differential bearing configure special tapered roller bearings. / P4 - dimensions and rotational accuracy conform ISO4 level tolerance (more than P5 precision). / P4A - dimensional accuracy tolerances conform ISO4 level, rotation accuracy equivalent AFBMA standard ABEC9 level. / P5 - Size rotational accuracy conform ISO5 level tolerance (accuracy better than P6). / PA9A - dimensions and rotational accuracy equivalent AFBMA standard ABEC9 level. / PA9B - dimensional accuracy equivalent AFBMA standard ABEC9, rotation accuracy is higher than PA9A high. / SP - dimensional accuracy is about P5, rotation accuracy is about P4. / UP - dimensional accuracy is approximately P4, rotation accuracy better than P4. 2) bearing clearance / C1 - clearance within the standard of a group, clearance less than two groups. / C2 - clearance within the standard of two groups, clearance less than 0 groups. / C0 - clearance within the standard of group 0, code omitted, does not mean that. / C3 - standard clearance provisions of the three groups, clearance greater than 0 groups. / C4 - clearance within the standard of four groups, clearance greater than 3 groups. / C5 - clearance within the standard of five groups, clearance greater than 4 groups. When the clearance code and bearing tolerance class code P4, P5 or P6 when combined clearance code C can be omitted. Example: P6 + C2 = P623) specific technical requirements. / Q - Best internal geometry and surface roughness (for tapered roller bearings). / Q66 - vibration level is less than ordinary standard, vibration peak is less than ordinary standard. / QE5 - in line with the special standard motor, size and rotation accuracy up to P6. Extremely low noise. / QE6 - comply with the standard motor, low noise. 4) bearing configuration. / DB - two can be paired single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings installed in pairs back to back. DB number after the size indicates the axial clearance or preload installation size. A - Light preload (angular contact ball bearings). B - preload greater than A (angular contact ball bearings). C - preload larger than B (angular contact ball bearings). CA - internal clearance smaller (deep groove or angular contact ball bearings). CB - internal clearance than the CA large (deep groove or angular contact ball bearings). CC - internal clearance than CB large (deep groove ball bearings). CG - "zero" clearance (tapered roller bearings). C ... - Special Axial internal clearance CC behind the numbers indicate the size of the axial clearance. GA - light preload (deep groove ball bearings). GB - pre-load is greater than CA (deep groove ball bearings). G ... - Special pre-load (G behind the numbers indicate the size of the pre-load). / DF - arranged in two face-paired single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings. DF can be followed with the same letters after DB. / DT - two pairs arranged in series deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings. 5) Heat treatment. Bearing inner ring size after stabilization, you can run the following temperatures :/ S0 - up to 150 degrees Celsius. / S1 - up to 200 degrees Celsius. / S2 - up to 250 degrees Celsius. / S3 - up to 300 degrees Celsius. / S4 - up to 350 degrees Celsius. 6) lubricant added. / W - can not replenish oil (no oil groove and oil hole). / W20 - bearing outer ring has three lubrication holes. / W33 - bearing outer ring with lubrication groove and three hole. / W33X - bearing outer ring with lubrication grooves and six hole. 7) lubricant. Used to identify the type of bearing grease filled the post code consists of a group of letters and two digits, letters temperature range, followed by two numbers indicate the actual use of the grease, common letter groups are as follows :/ HT - high temperature Grease (-20 degrees C to +130 degrees C). / LHT - low / high temperature grease (-40 degrees C to +140 degrees C). / LT - low fat (-50 degrees Celsius to +80 degrees Celsius). / MT - medium temperature grease (-30 degrees Celsius to 110 degrees Celsius). MT post code represents a specific non-standard bearing grease.
The amount of the standard SKF bearings bearing grease filling quantity (the free space inside the bearing 25% ~ 30%) is not the same, identified by an additional letter: A: less than the standard dosage amount of grease. B: amount of grease than the standard amount. C: grease consumption is greater than B. 8) other features. Letters V and another letter (eg VA) with three number combinations, can not be used to identify other existing post code expressing a variant of the standard design. If :/ VA201 - kiln car bearings. / VA301 - traction motors with cylindrical roller bearings.
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