Beijing XLBearings Limited

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·	Ceramic bearings
	The advantage of ceramic bearings Technical service of ceramic bearings Full ceramic(All-ceramic) bearing of ZrO2 material Full ceramic(All-ceramic) bearing of Si3N4 material Full ceramic(All-ceramic) bearing of full complement balls Full ceramic(All-ceramic) bearing of ceramic cage Hybrid construction ceramic ball bearing
·	Ceramic balls

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	Precision plastic bearings Anti-Corrosion Plastic Bearings Anti-Acid & Anti-Alkali Bearing High Temperature Application Plastic Bearings Plastic Inserts & Plastic Pillow Blocks
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· Add:1904, No.11, Jianwai
         SOHO, 39 East 3rd-Ring
         Road, Chao Yang District,
          Beijing, China
· Tel: +86 10 81572284
· Fax: +86 10 81572284
· Email:xlb@xlb.cc
· URL:www.bj-xlbearings.com


Products

Ceramic ball processing

Raw material → Making blank → High temperature high pressure sintering (GPS) → Grinding → Lapping → Final inspection

Ceramic brands

Types of GSN200 ceramic balls (in common use)

Brand	Performance	Price coefficient
GSN-100 (Si3N4)	Good wearability, corrosion resistance	0.6
GSN-200 (Si3N4)	Good wearability, corrosion resistance, impaction resistance, high strength	1
HSN-300 (Si3N4)	Best performance, high reliability, long fatigue life	1.5
NSC-100 (SiC)	Good wearability, high temperature resistance, conductive	1.1
NZO-100 (ZrO2 )	Good wearability, corrosion resistance	0.8

type		type
in	mm	in	mm
(1/32)	0.794	11/32	8.731
	0.800	(3/8)	9.525
	1.000	7/16	11.112
(1/16)	1.588	31/64	12.303
3/32	2.381	1/2	12.700
(5/32)	3.969	17/32	13.494
3/16	4.763	9/16	14.288
(7/32)	5.556	(19/32)	15.081
(15/64)	5.953	5/8	15.875
1/4	6.350	3/4	19.050
17/64	6.747	1	25.400
9/32	7.144	1 1/4	31.75
(5/16)	7.938	1 11/16	42.863

Grade of ceramic balls GB308-2002 ISO3290-1998 (E) Standard

Grade	Allowable ball diameter variation (Vdws, um)	Allowable deviation from spherical form ( um)	Surface roughness (Ra, um)
3	0.08	0.08	0.010
5	0.13	0.13	0.014
10	0.25	0.25	0.020
16	0.40	0.40	0.025
20	0.50	0.50	0.032
24	0.60	0.60	0.040
28	0.70	0.70	0.050
40	1.00	1.00	0.060
60	1.50	1.50	0.080

Grade	Lot diameter variation (Vdwl, u m)	Gauge interval ( u m)	Preferred gauge ( u m)	Subgauge interval ( u m)	Subgauge ( u m)
3	0.13	0.5	-5,..,-0.5,0,+0.5,..+5	0.1	-0.2,-0.1,0,+0.1,+0.2
5	0.25	1	-5,..-1,0,+1,..,+5	0.2	-0.4,-0.2,0,+0.2,+0.4
10	0.50	1	-9,..,-1,0,+1,..,+9	0.2	-0.4,-0.2,0,+0.2,+0.4
16	0.80	2	-10,..,-2,0,+2,..+10	0.4	-0.8,-0.4,0,+0.4,+0.8
20	1.0	2	-10,..,-2,0,+2,..+10	0.4	-0.8,-0.4,0,+0.4,+0.8
24	1.2	2	-12,..,-2,0,+2,..+12	0.4	-0.8,-0.4,0,+0.4,+0.8
28	1.4	2	-12,..,-2,0,+2,..+12	0.4	-0.8,-0.4,0,+0.4,+0.8
40	2.0	4	-16,..,-4,0,+4,..+16	0.8	-1.6,-0.8,0,+0.8,+1.6
60	3.0	6	-20,..,-5,0,+5,..+20	1	-2,-1,0,+1,+2