Rhoddir y cod ôl-ddodiad ar ôl y cod sylfaen. Pan fo setiau lluosog o godau post, dylid eu trefnu o'r chwith i'r dde yn nhrefn y codau post a restrir yn y tabl codau post. Mae rhai enwau cod post yn cael eu gwahanu oddi wrth y cod sylfaenol gan ddot bach.
Côd post - Strwythur Mewnol
A , B , C , D , E - newidiadau strwythurol mewnol
Enghraifft: Bearings peli cyswllt onglog 7205C, 7205E, 7205B, ongl cyswllt C-15 gradd, ongl cyswllt E-25 gradd, ongl cyswllt B-40 gradd.
Enghraifft: rholer silindrog, rholer sfferig a Bearings rholer sfferig byrdwn N309E, 21309E,29412E- dyluniad wedi'i atgyfnerthu, mae'r gallu llwyth dwyn yn cael ei wella.
VH - dwyn rholer silindrog cyflenwad llawn gyda rholeri hunan-gloi (mae diamedr y rholeri yn wahanol i ddiamedr y Bearings safonol o'r un math).
Post code - bearing dimensions and external structure
DA—— Separable double row angular contact ball bearing with double half inner ring. Example: 3306DA.
DZ - dwyn rholer diamedr allanol silindrog. Enghraifft: ST017DZ.
K—— Tapered bore bearing, taper 1:12. Example:c
K30- Dwyn turio taprog, tapr 1:30. Enghraifft: 24040 K30.
2LS—— Double row cylindrical roller bearing with double inner ring with dust cover on both sides. Example: NNF5026VC.2LS.V—— Internal structure change, double inner ring, with dust cover on both sides, full complement double row cylindrical roller bearing.
N——The bearing with snap groove on the outer ring. Example: 6207N.
NR - Bearings with snap grooves and snap rings on the outer ring.
N2-—— Four-point contact ball bearing with two snap grooves on the outer ring. Example: QJ315N2.
S—— Bearings with lubricating oil grooves and three lubricating oil holes in the outer ring. Example: 23040 S. Spherical roller bearings with bearing outer diameter D Greater than or equal to 320mm are not marked with S .
X—— Dimensions conform to international standards. Example: 32036X
Z••—— technical conditions for special structures. Arranged downwards from Z11 onwards. Example: Z15—— stainless steel bearing (W-N01.3541).
ZZ - dwyn rholer gyda dau gylch cadw i arwain y cylch allanol.
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