1、UDC 621.822.6/.8: 001.4: 003.62 DEUTSCHE NORM May 199 DIN - 623 Designation system for rolling bearings I Part 1 Wlzlager; Grundlagen; Bezeichnung, Kennzeichnung Supersedes March 1984 edition. Contents Page 1 Scope and field of application . 1 2 Designation structure 1 2.1 Nomenclature . 1 2.2 DIN n
2、umber 1 2.3 System of symbol groups . 2 2.4 Sequence of sections and supplementary symbols . 2 2.5 Structuring of designation 2 3 Symbols . 2 3.1 Prefixes 2 3.1.2 Material 2 3.2 Basic symbols 2 3.2.1 Bearing series . 2 3.2.2 Bore . 3 3.1.1 Sub-units . 2 1 Scope and field of application This standard
3、 specifies a designation system for rolling bearings which facilitates their identification ensuring the appropriate exchange of bearing parts (sub-units). 2 Designation structure The designation system is based on the specifications of DIN 820 Part 27, table 1 providing all the details required for
4、 the complete designation of bearings. Basic symbols shall always be given in full. Prefixes, suf- fixes and supplementary symbols (as specified in sub- clauses 3.1, 3.3 and 3.4) may be omitted: a) in cases where materials as specified in subclause 3.1.2 are used (standard cases); b) where the beari
5、ng does not have the particular fea- ture; c) in the cases dealt with in subclause 3.3 (PN, CN, SN), where no suffix is given for the cage; d) where no specifications have been made for the par- ticular feature. In this case, the bearing design shall be at the manufacturers discretion, with due cons
6、idera- tion being given to the relevant standards. Page 3.3 Suffixes 3 3.3.1 Internal design 3 3.3.2 External shape 3 3.3.3 Cage details 4 3.3.3.1 Cage material 4 3.3.3.2 Cage design . 4 3.3.3.3 Bearings without cage 4 3.3.4 Tolerances 4 3.3.5 Internal clearance 5 3.3.6 Heat treatment condition 5 3.
7、3.7 Lubrication . 5 4 Examples of designation 5 5 Survey 7 3.4 Supplementary symbols 5 6 Marking 14 Prefixes and suffixes may be invariably long, as long as their meaning is not changed. EXAMPLES: TN9: Plastic cage, design variant 9; JP3: Sheet steel window type cage, design variant 3. 2.1 Nomenclat
8、ure When combining symbols to form a designation in accord- ance with standards, the established nomenclature of roll- ing bearing types indicating the type of rolling bearing and its raceway geometry shall be used (e.g. deep groove ball bearing, self-aligning roller bearing). Given the restrictions
9、 on the number of characters in the designation block, the term radial widely used in commer- cial designations should be omitted. See table 3 for established nomenclature of rolling bear- ings. 2.2 DIN number See table 3 for the relevant DIN standards. Continued on pages 2 to 15. Beuth Verlag Gmbii
10、, Berlin, has lhe exclusive right of sale for German Standards (DIN-Normen). 05.95 DIN 623 Part 1 Engl. Price group 12 Sales No. O1 12 Page 2 DIN 623 Part 1 Table 1: Designation structure, number of symbols and reference to the relevant clause Term 2.1 (18 char- acters max.) Deep groove ball bearing
11、 self- aligning roller bearing E.g.- I) The designation may include up to 56 symbols. Identification DIN number System of symbol groups (18 characters max.) 3.4 Supple- mentary symbols 3.3 Suffixes 3.1 Prefixes 3.1.1 Sub-units 3.1.2 Material 3.2 Basic symbols 2.2 (10 char- acters max.) 3.2.2 Bore 3.
12、3.1 Internal design 3.3.2 External shape 3.3.3 Cage details 3.3.4 Tolerances 3.3.5 Internal clear- ance 3.3.6 Heat treatment condition 3.3.7 Lubrication 3.2.1 Bearing series Dimension series to DIN 616 DIN 625 At manu- facturers discretion. Bearing type Width or height series Diameter series DIN 636
13、 Sub-units designated by letters L and R represent a com- plete bearing of a particular type. However, full serviceabil- ity of the bearing is only ensured if these units originate from the same manufacturer. Where a separable ring consists of several elements, such as an inner ring and an extended
14、ring (e.9. for an NUP type cylindrical roller bearing), letter L shall be used. 2.3 System of symbol groups As shown in table 1, there are four groups of symbols (sec- tions), namely prefixes, basic symbols, suffixes, and sup- plementary symbols. 2.4 Sequence of sections and supplementary The (four)
15、 sections listed in subclause 2.3 shall be used in the order shown in that subclause. The sequence of symbols in the basic designation shall be as specified in subclause 3.2. For prefixes, suffixes and supplementary symbols, the order of numerals or letters shall be as specified in subclauses 3.1, 3
16、.3, and 3.4. symbols 3.1.2 Material As a rule, rings (e.g. outer and inner rings) and rolling ele- ments shall be made of steel as specified in DIN 17230; rolling bearings made of stainless steel shall be designated by prefix S. 3.2 Basic symbols The basic symbol designates the bearing type and size
17、. It, normally, is to consist of one symbol or one symbol group each for bearing series (cf. subclause 3.2.1) and bore (cf. subclause 3.2.2). See table 1 for the structure of basic sym- bols. The above specifications do not apply to needle cy- lindrical roller thrust bearings, needle roller thrust b
18、earings, open end drawn cups, closed end drawn cups, radial nee- dle roller and cage assemblies, thrust needle roller and cage assemblies and thrust washers. In these cases, the basic symbol is composed of symbol/group(s) of symbols for bearing type and characteristic dimension(s), as shown in table
19、 5. The designation system for metric tapered roller bearings specified in IS0355 applies by analogy and should be given preference for new designs. 2.5 Structuring of designation A blank, a dash (-), slash (4, cross (x) or full stop (0) may be used to separate designation blocks from one another. 3
20、 Symbols 3.1 Prefixes 3.1.1 Sub-units Prefixes shall be used to designate bearing parts (sub- units), e.g.: Sub-units of separable rolling bearings (e.g. cylindrical roller bearings or tapered roller bearings), such as separa- ble rings or roller sets with non-separable rings, shall be designated by
21、 a prefix: L separable ring (e.9. LNU 419, designating the inner ring of a bearing of series NU 419); R ring (inner or outer ring) with rolling element set K cage with rolling elements (e.g. RNU 419, designating the roller set, with the outer ring belonging to bearing series NU 419). 3.2.1 Bearing s
22、eries A bearing series is characterized by the bearing type and dimension series, each bearing series being identified by a group of numerals or letters or by a combination of numer- als and letters (cf. table 3). DIN 623 Part 1 Page 3 3.2.2 Bore cage details (cf. subclause 3.3.3); The symbol used t
23、o denote the bearing bore is to consist of tolerances (cf. subclause 3.3.4): numerals and is either appended to the symbol denoting the bearing series or, in some cases, preceded by a slash (see table 4). internal clearance (cf. subclause 3.3.5); heat treatment condition (cf. subclause 3.3.6); lubri
24、cation (cf. subclause 3.3.7). 3.3 Suffixes 3.3.1 Internal design Letters A, B, G, D, and E may be used to identify features Suffixes are used to designate the following A:_ of the bearing internal design. Their meaning is not speci- fied. Thev should be consistent with the Drefixes and suf- IlCs: in
25、ternal design (cf. subclause 3.3.1); external shape (cf. subclause 3.3.2); shield and seal (cf. subclause 3.3.2); fixes specified in this standard or with thespecifications of other relevant standards. They may be used to identify bearings of the same type and external dimensions, but of different i
26、nternal design. 3.3.2 External shape K K30 S Z 22 RS 2RS N Type K: Bearing with tapered bore, taper 1 :12 EXAMPLE: 1207 K = Self-aligning ball bearing as for type 1207, but with tapered bore Type K30: Bearing with tapered bore, taper 1 :30 EXAMPLE: 24138 K30 = Self-aligning ball bearing as for type
27、24138, but with tapered bore Type S: Double row bearing with lubrication groove and at least three lubrication holes in the outer ring EXAMPLE: 22328 S Type Z: Bearing with shield on one side EXAMPLE: 6207-2 Type 22: Bearing with shields on both sides EXAMPLE: 6207-22 Type RS: Bearing with seal on o
28、ne side (with rubber seal, e.g. NBR (cf. IS0 1629) EXAMPLE: 6207-RS Type 2%: Bearing with seals on both sides (with rubber seal, e.g. NBR (cf. IS0 1629) 6207-2RS Type N: Bearing with snap ring groove on surface of outer ring and with dimensions as in DIN 616 EXAMPLE: 6207 N Page 4 DIN 623 Part 1 NR
29、ZN RSN or ZN B or RSNB ZNBR or RSNBR N2 R Type NR: Bearing with snap ring groove on surface of outer ring as in DIN 616 and associated snap ring as in DIN 5417 EXAMPLE: 6008 NR Type ZN: Bearing with shield on one side and snap ring groove on surface of outer ring (as in DIN 616), on the opposite sid
30、e. The designation for type RSN bearings with seal shall be as follows: EXAMPLE: For bearings with two shields or seals, the example would be changed to read: 6206-2ZN or 6206- ZRSN. 6206-ZN Type ZNB: Bearing with shield or seal and snap ring groove in outer ring (as in DIN 616), on the same side EX
31、AMPLE: For bearings with shield, the example would be changed to read: 6207-ZNB 6207-RSNB Type ZNBR: Bearing with shield or seal, snap ring groove as in DIN 616, in outer ring on the same side, with associated DIN 5417 snap ring EXAMPLE: For bearings with two shields or seals, the example would be c
32、hanged to read: 6207-2ZNR or 6207- 2RSNR 6207-ZNBR Type N2: Two keeper slots on one side of the outer ring or in the housing washer EXAMPLE: QJ 228 N2 Type R: Bearing with flanged outer ring EXAMPLE: 33217 R 3.3.3 Cage details A suffix for the cage may be omitted if the requirements specified in the
33、 relevant basic or product standards are met, .e. the cage design is at the manufacturers discretion unless a specific cage design is required, where this is to be indicated in compliance with the designation system given below. 3.3.3.1 Cage material Cage material shall be designated by the followin
34、g sym- bols: J sheet steel cage Y copper-zinc sheet cage M solid copper-zinc alloy cage F L solid light metal cage T fibre reinforced plastic cage TN plastic cage (details subject to agreement) solid steel or special cast iron cage 3.3.3.2 Cage design Symbols to designate the cage design shall be us
35、ed to- gether with symbols as specified in subclause 3.3.3.1. P window type cage H snap cage A cage guided on outer ring B cage guided on inner ring S Cage with lubrication grooves in the locating sur- faces EXAMPLES: Suffix to designate a solid copper-zinc alloy cage guided on outer ring: MA Suffix
36、 to designate a window type cage guided on inner ring: MPB 3.3.3.3 Bearings without cage Bearings without cage shall be designated as follows: V full type or full complement rolling bearing VH full type rolling bearing without cage 3.3.4 Tolerances Unless the tolerances specified in DIN 620 Parts 2
37、and 3 for radial and thrust bearings are applicable, other relevant DIN 623 Part 1 Page 5 Suffixes as in this standard Symbols as in DIN 51 825 GL K2E-50 GN) K2K-30 or K3K-30 GH K2N-30 standards (e.g. DIN 618 Part 1 and DIN 5405) may be ap- plied. Tolerances shall be identified by the following suff
38、ixes: P2 bearings produced to IS0 tolerance class 2; P4 bearings produced to IS0 tolerance class 4; P5 bearings produced to IS0 tolerance class 5; P6 bearings produced to IS0 tolerance class 6; PN bearings produced to a normal tolerance class (for standard applications). Symbol need not be given in
39、the designation. 3.3.5 Internal clearance Unless the radial clearances specified in DIN 620 Parts 4 and 3 are applicable, other relevant standards may be ap- plied. The internal clearance shall be identified by the following suffixes: C2 internal clearance smaller than CN; CN internal clearance grea
40、ter than C2 but smaller than C3 (for standard applications) (symbol need not be given in the designation; internal clearance greater than CN: internal clearance greater than C3; internal clearance greater than C4. C3 C4 C5 Where the designation is to specify both internal clearance and tolerances, t
41、he symbols may be combined, omitting letter C (internal clearance). EXAMPLE: A bearing produced to tolerance class P5 and with internal clearance C3 shall be designated P53. 3.3.6 Heat treatment condition The required heat treatment of rolling bearings is a function of the maximum service temperatur
42、e. Without any heat treatment, bearings are suitable for operation at service temperatures up to 120 OC. If bearings are designed for exposure to higher service temperatures, they are to be subjected to heat treatment. In the absence of any suffix for heat treatment, the service temperature under st
43、eady-state conditions in the raceway of the outer ring shall not exceed 120 OC. The heat treat- ment condition is to be indicated using the following suf- fixes: Service temperature range, in “C - 50 to + 80 - 30 to + 120 - 30 to + 140 SN so s1 s2 s3 s4 SOB rings or washers suitable for operation at
44、 service temperatures up to 120 OC (symbol need not be given in the designation); rings or washers suitable for operation at service temperatures up to 150 “C; rings or washers suitable for operation at service temperatures up to 200 “C; rings or washers suitable for operation at service temperature
45、s up to 250 “C: rings or washers suitable for operation at service temperatures up to 300 “C; rings or washers suitable for operation at service temperatures up to 350 “C: internal rings or shaft washers suitable for opera- tion at service temperatures up to 150 “C. 3.3.7 Lubrication Lubrication of
46、bearings by the manufacturer is mandatory for types -22 and -2RS. See DIN 51 825 and DIN 51 502 for requirements to be met by lubricants or greases and their designation. Where no suffix is given in the designation of rolling bear- ings that are sealed on both sides, the bearing may be assumed to be
47、 lubricated with a type K2K-30 or K3K-30 lubricant as specified in DIN 51 825. The use of other lubricants in compliance with DIN 51 825 is subject to agreement. Such lubricants are to be designated using the symbols specified in table 2. Further lubricants, not covered by the groups listed in ta- b
48、le 2, shall be subject to an agreement based on DIN 51 825 and DIN 51 502. Non-standardized lubricants shall be given the manufacturers symbol. The suffixes specified apply to sealed and unsealed bear- ings (normally, unsealed bearings need not be lubricated). Lubricants required for mounting or for
49、 greasing bearings that have not been not lubricated by the manufacturer may be selected from table 2. 3.4 Supplementary symbols Where features are not covered by the symbols specified in subclauses 3.1 to 3.3, the manufacturer may use additional symbols (supplementary symbols, for short). Page 6 DIN 623 Part 1 Cage design: window type cage 4 Examples of designation Tables 1 and 4 show how the symbols identifying bearing type, width or height series, and bore diameter series, are combined to form a basic symbol. (See tables 3 and 5 for exceptions.) EXAMPLES: A deep groove
