Characteristic of the parts:
Plate：As the main connecting and bearing component it is made of alloy steel or carbide steel，and heat-treated and shot peening hardened with the result of high comprehensive mechanical capability，up to high tensile strength。
Pin：Made of strictly selected low or neutral carbide alloy steel。Chemically or comprehensively and heat-treated finished，and consequently smooth finished for high hardness and small friction。With high wearability and tenacity。
Bushings：Exquisitely manufactured from handpicked or low-carbon carbide steel。Through consequent carburizing or carbonitriding treatment。With high hardness a-nd low friction。
Rollers：Made from high-quality low-carbon steel or low-carbon alloy steel。Trough shot peening hardening treatment。With high wearability，hardness and anti-fatigue。
Roller Link and Pin Link：Main components of a chai.

Roller Link：Made up of rollers，bushings and inner plates.

Pin link: Made up of pins and outer plates.

Connecting Link：Made up of connecting pins，outer plates，connecting and locking pins。Used for roller link at the ends of the chain.

Offset Link：Used for connecting between the roller link and pin link at the each end of chain.

Double Offset Link：Made up of link and roller link，used for connecting between ends.

Double offset link are recommended instead of offset link because the latter will reduce the chain’s intensity by 20%.

Tensile strength：
For users’ safety，the average tensile strength is treated to be qualified standard for leaving factory in the quality control process。This index is 10-15% higher than that of ISO，ANSI and DIN standard。(See the chart below) .

Tensile Strength Test for part in the Product line：

Tensile Strength Test of Finished Products:

The Maximum Permitted Working Loading is the Maximum Working Load got form the fatigue test in accordance with JB5387-91 Standard.

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Bearing TOP
1. Bearing material：
The rings、balls、needles and rollers of the bearings can be made of refining bearing steel AISI52100, stainless steel。
Cages are normally punch-pressed from steel strips 08, SPCC BQB402, as well as stainless steel 、plastics or copper stock。
The shields can be made of Japanese SPCC JISG3141 or stainless steel。
Seals: synthetic rubber hot pressed with phosphatizing steel。
The chemical composition of bearing steel and stainless steel are listed as follows:

Steel No.	GB NO.	C%	Si%	Mn%	S%	P%	Cr%
AISI52100	GCr15	0.95-1.05	0.15-0.35	0.25-0.45	<0.02	<0.027	1.4-1.65
AISI440C	9Cr18, 9Cr18Mo	0.90-1.05	<0.8	<0.8	<0.04	<0.03	16-19

2. Bearings Accuracy Grade：

	Accuracy   Grade
GB	0	6	5	4	2
ISO	0	6	5	4	2
ANSI	ABEC-1	ABEC-3	ABEC-5	ABEC-7	ABEC-9
DIN	P0	P6	P5	P4	P2
JIS	0	6	5	4	2

3. Radial Clearance of Deep Groove Ball Bearings：
The radial clearance of bearing might be divided into five groups according to ISO 5753,C2、C0、C3、C4、C5.

Bore diameter D(mm)		C2		C0		C3		C4		C5
Over	To	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
2.5	10	0	7	2	13	8	23	14	29	20	37
10	18	0	9	3	18	11	25	18	33	25	45
18	24	0	10	5	20	13	28	20	36	28	48
24	30	1	11	5	20	13	28	23	41	30	53
30	40	1	11	6	20	15	33	28	46	40	62

4. Deep Groove Ball Bearing’s Vibration and Noise Class：
According to related standard，the vibration noise(dB) of bearings for their vibration under acceleration are divided into four groups：Z1,Z2,Z3,Z4；Also they can be divided into four groups according to vibration speed(um/s)：V1,V2,V3,V4.

Bore diameter d(mm)	Deep Groove Ball Accelerating Vibration(dB)											Axes load
	Diameter series(0)(1)			Diameter series(2)				Diameter series(3)
	Z1	Z2	Z3	Z1	Z2	Z3	Z4	Z1	Z2	Z3	Z4
3	34	32	28	35	32	30	-	36	33	31	-	30
4	34	32	28	35	32	30	-	36	33	31	-
5	36	34	30	37	34	32	-	37	35	33	-
6	36	34	30	37	34	32	-	37	35	33	-
7	38	35	31	38	36	34	-	--	--	--	-	40
8	38	35	31	38	36	34	-	--	--	--	-
9	40	36	32	40	37	35	-	--	--	--	-
10	42	38	33	42	39	35	35	44	40	37	32
12	43	39	34	43	39	35	35	45	40	37	32
15	44	40	35	44	41	36	36	46	42	38	33
17	44	40	35	45	41	36	36	47	42	38	33
20	45	41	36	46	42	38	38	48	43	39	34
25	46	42	38	47	43	40	40	49	44	41	37	80
30	47	43	39	48	44	41	41	50	45	42	38

Bore diameter d(mm)	Deep Groove Ball Bearing Speed Viabration(um/s)												Axes load
	V1			V2			V3			V4
	L	M	H	L	M	H	L	M	H	L	M	H
3	60	35	32	48	26	22	31	16	15	28	10	10	30
4	60	35	32	48	26	22	31	16	15	28	10	10
5	90	60	50	58	36	30	35	21	18	32	11	11
6	90	60	50	58	36	30	35	21	18	32	11	11
7	110	80	65	72	48	40	44	28	24	38	12	12
8	110	80	65	72	48	40	44	28	24	38	12	12
9	110	80	65	72	48	40	44	28	24	38	12	12	40
10	140	100	85	90	60	50	55	35	30	45	14	15
12	140	100	85	90	60	50	55	35	30	45	14	15
15	180	130	100	110	78	60	65	46	35	52	18	18
17	180	130	100	110	78	60	65	46	35	52	25	25
20	220	160	125	130	100	75	80	60	45	60	25	25
22	220	160	125	130	100	75	80	60	45	60	30	32	80
25	220	160	125	130	100	75	80	60	45	60	30	32
28	220	160	125	130	100	75	80	60	45	60	35	40
30	250	200	160	150	120	100	90	75	60	70	35	40

5. Characteristics of grease lubrication：

Company	Designation	Dropping Tem.	Penetration at 25℃	Working Tem.℃	Remarks
		℃
Shell	Alvania R2	185	265-295	-35-120	General purpose
	Alvania R3	185	220-250	-35-135
	Alvania RA	180	250-275	-25-100
	Alvania EP1	180	310-340	-25-110
	Alvania EP2	185	265-295	-25-110
	Darina 2	250	265-295	-25-150	high Tem. service
	Darina EP2	250	265-295	-25-150
	dolium R2	250	265-295	-35-150	corrosion resistant
Esso	Andok C	260	190-210	-30-120	General purpose
	Adnok 260	190	204-260	-40-120
	Beacon 325	190	255-280	-54-120	low Tem. service
Chevron	SRI-2	240	255-280	-30-120	water resistant
Mobil	Mobilux 2	190	265-290	-10-110	General purpose
	Mobil 22	192	250-274	-40-120
	Mobil 28	260	265-295	-55-175	wide range Tem. service
	Mobil 48	260	240-270	-60-170	high Tem. service
Kluber	Isoflex LDS18	190	255-280	-50-110	low Tem. service
	Isoflex NBU15	250	255-280	-30-120	General purpose
Kyodo Yushi	Multemp SRL	185	225-245	-40-145	low torque service
	Multemp PS2	190	250-275	-50-110	low Tem. service
	Multemp SC-A	260	255-280	0-160	high Tem. service
	Multemp ET150	260	255-280	-10-160
China Hangu	Hangu 2	198	265-295	-10-130	low noise service