Product Details

HK Series Needle Roller Bearing HK071108

Product Description

HK Series Needle Roller Bearing HK071108 details

What is needle roller bearing?
Needle bearings use a roller style rolling element to reduce friction of a rotating surface. Needle Bearings have a high load carrying capacity with a very small cross section height. They are available with or without an inner ring. The needle rollers are guided parallel to the axis using a cage retainer, thrust bearings can also be supplied with no retainer, which is referred to as a full complement of rollers.

Needle bearings have a larger surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less clearance, or the difference between the diameter of the shaft and the diameter of the bearing, so they are much more compact. The typical structure consists of an inner race (or sometimes merely a shaft), a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race.Needle bearings are heavily used in engine components such as rocker arm pivots, pumps, compressors, and transmissions.

A needle roller bearing is a bearing which uses small cylindrical rollers.The difference between a needle roller bearing and roller bearing is the ratio of diameter and length of their rollers, when the ratio of the diameter and the length of roller of a roller bearing is between the interval of 0.1 to 0.4, that roller bearing is called a needle roller bearing. They are used to reduce the friction of a rotating surface.

Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance (difference between the diameter of the shaft and the diameter of the bearing) so they are much more compact. The typical structure consists of a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race (sometimes the housing itself).

Radial needle bearings are cylindrical and use rollers parallel to the axis of the shaft. Thrust needle bearings are flat and use a radial pattern of needles.

Full complement bearings have solid inner and outer rings and rib-guided cylindrical rollers. Since these bearings have the largest possible number of rolling elements, they have extremely high radial load carrying capacity and are suitable for particularly compact designs.

What are the applications of Needle Roller Bearings?

Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four in each U joint) and often more if it is particularly long, or operates on steep slopes.

Additional clarification of needle roller bearing: According to "Marks' Standard Handbook for Mechanical Engineers", a needle bearing is a roller bearing with rollers whose length are at least four times their diameter.

• Paper moving for copiers, fax machines, paper towel dispensers, etc.
• Exercise equipment
• Two-speed gearboxes
• Rack indexing drives
• Converters, non-return devices and transcendental clutches.
• Fishing Reels, RC Cars, RC Helis, RC Engines

What kind of needle roller bearings can our factory provide?

HK Series Needle Roller Bearing HK071108 photos

These picuters are real, taken in our factory, if your target model is not at below,just contact me.For most needle roller Bearings, we have stock.

Item	old Item	d	D	B(mm)
Item	old Item	(mm)	(mm)	B(mm)
HK0408	37941/4	4	8	8
HK0509	47941/5	5	9	9
HK0608	37941/6	6	10	8
HK0609	47941/6	6	10	9
HK0709	47941/7	7	11	9
HK0808	37941/8	8	12	8
HK0810	57941/8	8	12	10
HK0910	57941/9	9	13	10
HK0912	67941/9	9	13	12
HK1010	57941/10	10	14	10
HK1012	67941/10	10	14	12
HK1210	57941/12	12	16	10
HK1412	37941/14	14	20	12
HK1416	57941/14	14	20	16
HK1512	37941/15	15	21	12
HK1516	57941/15	15	21	16
HK1612	37941/16	16	22	12
HK1616	57941/16	16	22	16
HK1712	37941/17	17	23	12
HK1812	37941/18	18	24	12
HK1816	57941/18	18	24	16
HK2010	27941/20	20	26	10
HK2012	37941/20	20	26	12
HK2016	57941/20	20	26	16
HK2210	27941/22	22	28	10
HK2212	37941/22	22	28	12
HK2216	57941/22	22	28	16
HK2512	27941/25	25	32	12
HK2516	47941/25	25	32	16
HK2520	67941/25	25	32	20
HK2816	47941/28	28	35	16
HK2820	67941/28	28	35	20
HK3012	27941/30	30	37	12
HK3016	47941/30	30	37	16
HK3020	67941/30	30	37	20
HK3512	27941/35	35	42	12
HK3520	67941/35	35	42	20
HK4012	27941/40	40	47	12
HK4020	67941/40	40	47	20
HK4512	27941/45	45	52	12

Shaft Dia	Unit No.	Dimensions (mm)						Basic Load Ratings		Limiting speed	Weight
mm	Unit No.	d	F	D	B	r min	S	C KN	C0 KN	r/min	g
10	NA4900	10	14	22	13	0.3	0.5	8.5	9.2	20000	23
12	NA4901	12	16	24	13	0.3	0.5	9.4	10.9	17000	26
15	NA4902	15	20	28	13	0.3	0.5	10.6	13.6	14000	34
17	NA4903	17	22	30	13	0.3	0.5	11	14.6	12000	37
20	NA4904	20	25	37	17	0.3	0.8	21	25.5	10000	141
22	NA49/22	22	28	39	17	0.3	0.8	22.8	29.5	9500	80
25	NA4905	25	30	42	17	0.3	0.8	23.6	31.5	9500	88
28	NA49/28	28	32	45	17	0.3	0.8	24.4	33.5	8500	97.7
30	NA4906	30	35	47	17	0.3	0.8	25	35.5	8000	101
32	NA49/32	32	40	52	20	0.6	0.8	30.5	47.5	7000	158
35	NA4907	35	42	55	20	0.6	0.8	31.5	50	7000	170
40	NA4908	40	48	62	22	0.6	1	43	67	6000	230
45	NA4909	45	52	68	22	0.6	1	45	73	8500	5500
50	NA4910	50	58	72	22	0.6	1	47	80	5000	274
55	NA4911	55	63	80	25	1	1.5	58	100	4700	393
60	NA4912	60	68	85	25	1	1.5	60	108	4300	426
65	NA4913	65	72	90	25	1	1.5	61	112	4100	456
70	NA4914	70	80	100	30	1	1.5	84	156	3800	728
75	NA4915	75	85	105	30	1	1.5	86	162	3600	775
80	NA4916	80	90	110	30	1	1.5	89	174	3400	878
85	NA4917	85	100	120	35	1.1	1	111	237	2800	1250
90	NA4918	90	105	125	35	1.1	1	114	250	3000	1312
95	NA4919	95	110	130	3	1.1	1	116	260	2800	1371
100	NA4920	100	115	140	40	1.1	2	128	270	2900	1900
110	NA4922	110	125	150	40	1.1	2	132	290	2600	2070
120	NA4924	120	135	165	45	1.1	2	181	390	2300	2860
130	NA4926	130	150	180	50	1.5	1.5	203	470	2000	3900
140	NA4928	140	160	190	50	1.5	1.5	209	500	1800	4150

Company Information

Trading information

Item	Needle roller bearing
MOQ	1pcs
Port	Qingdao/Shenzhen/Shanghai
Payment method	1. T/T(better for big amount) 2. Paypal(better for small amount, if for big amount the paypal charge will be high, timely account) 3.Western Union 4.Secure payment(Via alibaba, safe payment, Zero risk)
Supply ability	100000pcs/month
Delivery time	2-5 days of stock, 15-50 days for OEM
Sample policy	Free sample available
After sale service	After you recieved the goods, if there is problem of the goods, please contact us, we will give our solution(compensate or return) according to the situations.
Packing	Plastic bag+Brand color box+Outer carton+Wooden pallet