Standard No.:	JB/T 3123-2007
English Name:	Rolling bearings-Combined needle roller bearings with angular contact ball bearings - Boundary dimensions
Chinese Name:	滚动轴承 滚针和角接触球组合轴承 外形尺寸
Chinese Classification:	J11    Rolling bearing
Professional Classification:	JB    Professional Standard - Machinery
ICS Classification:	21.100.20 21.100.20    Rolling bearings 21.100.20
Issued by:	NDRC
Issued on:	2007-3-6
Implemented on:	2007-9-1
Status:	valid
Superseding:	JB/T 3123-1991
Language:	English
File Format:	PDF
Word Count:	1000 words
Price(USD):	224.00
Delivery:	via email in 1 business day

1. Scope



This standard specifies the boundary dimensions of two structural types of combined needle roller bearings with angular contact ball bearings (hereinafter referred to as combined bearings).

Type NKIA 0000 - the combined needle roller bearings with angular contact ball bearings (see Figure 1);

Type NKIB 0000 - the combined needle roller bearings with three-point contact ball bearings (see Figure 2).

This standard is applicable to the combined bearings installed and used in the components under large radial load and small single-direction (or double-direction) axial load as well as limited radial dimension.

Contents
Foreword I
1. Scope
2. Normative References
3. Terms, Definitions and Symbols
4. Boundary Dimensions
Figure 1 Type NKIA 0000
Figure 2 Type NKIB 0000