IR Series Needle Roller Bearing Inner Ring

BMT Bearings manufactures IR Series Needle Roller Bearing Inner Rings made from hardened bearing steel with precision grinding. They provide high wear resistance, stable rotation accuracy, and long service life for industrial machinery, gear systems, pumps, and OEM applications.

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Product Description

IR Series Needle Roller Bearing Inner Rings are designed to provide a stable and hardened raceway for needle roller bearing systems. In many industrial transmissions, the inner ring directly affects vibration level, load stability, and overall bearing life.

BMT Bearings focuses on improving real operating performance by controlling material quality, heat treatment, and precision grinding for every production batch.

Precision Material Selection

We use high-quality bearing steels such as GCr15 / SAE52100, ensuring:

High hardness after heat treatment

Strong rolling fatigue resistance

Stable dimensional accuracy

Long-term wear resistance

For special environments, stainless steel options can also be customized based on application requirements.

Precision Ground Surface for Better Performance

The raceway surface plays a key role in bearing stability and noise control.

Our IR Series Inner Rings are fully precision-ground after heat treatment, ensuring:

Lower vibration and noise

Smoother rolling contact

Improved lubrication performance

Reduced friction and heat generation

Longer service life

This is especially important in electric motors, gearboxes, textile machines, and automation systems.

Strict Manufacturing Control

To ensure consistent quality, each production batch is inspected through:

Hardness testing

Raceway roughness measurement

Roundness inspection

Dimensional tolerance control

Surface defect detection

With automated grinding and inspection systems, we maintain stable quality for both small and large OEM orders.

Ir Series Needle Roller Bearing Inner Ring

Technical Parameters

	Dimension(mm)				Dimension(mm)
Part Number	d (mm)	F (mm)	B (mm)	Part Number	d (mm)	F (mm)	B (mm)
IR5X8X12	5	8	12	IR35X43X22	35	43	22
IR5X8X16	5	8	16	IR38X43X20	38	43	20
IR6X9X12	6	9	12	IR38X43X30	38	43	30
IR6X9X16	6	9	16	IR40X45X17	40	45	17
IR7X10X10.5	7	10	10.5	IR40X45X20	40	45	20
IR7X10X12	7	10	12	IR40X45X20.5	40	45	20.5
IR7X10X16	7	10	16	IR40X45X30	40	45	30
IR8X12X10.5	8	12	10.5	IR40X48X22	40	48	22
IR8X12X12	8	12	12	IR40X48X40	40	48	40
IR8X12X12.5	8	12	12.5	IR40X50X22	40	50	22
IR9X12X12	9	12	12	IR42X47X20	42	47	20
IR9X12X16	9	12	16	IR42X47X30	42	47	30
IR10X13X12.5	10	13	12.5	IR45X50X25	45	50	25
IR10X14X13	10	14	13	IR45X50X25.5	45	50	25.5
IR10X14X16	10	14	16	IR45X50X35	45	50	35
IR10X14X20	10	14	20	IR45X52X22	45	52	22
IR12X15X12	12	15	12	IR45X52X40	45	52	40
IR12X15X12.5	12	15	12.5	IR45X55X22	45	55	22
IR12X15X16	12	15	16	IR50X55X25	50	55	25
IR12X15X16.5	12	15	16.5	IR50X55X35	50	55	35
IR12X15X22.5	12	15	22.5	IR50X58X22	50	58	22
IR12X16X13	12	16	13	IR50X58X40	50	58	40
IR12X16X16	12	16	16	IR50X60X25	50	60	25
IR12X16X20	12	16	20	IR50X60X28	50	60	28
IR12X16X22	12	16	22	IR55X60X25	55	60	25
IR14X17X17	14	17	17	IR55X60X35	55	60	35
IR15X18X16	15	18	16	IR55X63X25	55	63	25
IR15X18X16.5	15	18	16.5	IR55X63X45	55	63	45
IR15X19X16	15	19	16	IR55X65X28	55	65	28
IR15X19X20	15	19	20	IR60X68X25	60	68	25
IR15X20X13	15	20	13	IR60X68X35	60	68	35
IR15X20X23	15	20	23	IR60X68X45	60	68	45
IR17X20X16	17	20	16	IR60X70X25	60	70	25
IR17X20X16.5	17	20	16.5	IR60X70X28	60	70	28
IR17X20X20	17	20	20	IR65X72X25	65	72	25
IR17X20X20.5	17	20	20.5	IR65X72X45	65	72	45
IR17X20X30.5	17	20	30.5	IR65X73X25	65	73	25
IR17X21X16	17	21	16	IR65X73X35	65	73	35
IR17X21X20	17	21	20	IR65X75X28	65	75	28
IR17X22X13	17	22	13	IR70X80X25	70	80	25
IR17X22X16	17	22	16	IR70X80X30	70	80	30
IR17X22X23	17	22	23	IR70X80X35	70	80	35
IR17X24X20	17	24	20	IR70X80X54	70	80	54
IR20X24X16	20	24	16	IR75X85X25	75	85	25
IR20X24X20	20	24	20	IR75X85X30	75	85	30
IR20X25X17	20	25	17	IR75X85X35	75	85	35
IR20X25X20	20	25	20	IR75X85X54	75	85	54
IR20X25X20.5	20	25	20.5	IR80X90X25	80	90	25
IR20X25X26.5	20	25	26.5	IR80X90X30	80	90	30
IR20X25X30	20	25	30	IR80X90X35	80	90	35
IR20X25X38.5	20	25	38.5	IR80X90X54	80	90	54
IR20X28X20	20	28	20	IR85X95X26	85	95	26
IR22X26X16	22	26	16	IR85X95X36	85	95	36
IR22X26X20	22	26	20	IR85X100X35	85	100	35
IR22X28X17	22	28	17	IR85X100X63	85	100	63
IR22X28X20	22	28	20	IR90X100X26	90	100	26
IR22X28X20.5	22	28	20.5	IR90X100X30	90	100	30
IR22X28X30	22	28	30	IR90X100X36	90	100	36
IR25X29X20	25	29	20	IR90X105X35	90	105	35
IR25X29X30	25	29	30	IR90X105X63	90	105	63
IR25X30X17	25	30	17	IR95X105X26	95	105	26
IR25X30X20	25	30	20	IR95x105x36	95	105	36
IR25X30X20.5	25	30	20.5	IR95X110X35	95	110	35
IR25X30X26.5	25	30	26.5	IR95X110X63	95	110	63
IR25X30X30	25	30	30	IR100X110X30	100	110	30
IR25X30X32	25	30	32	IR100X110X40	100	110	40
IR25X30X38.5	25	30	38.5	IR100X115X40	100	115	40
IR25X32X22	25	32	22	IR110X120X30	110	120	30
IR28X32X17	28	32	17	IR110X125X40	110	125	40
IR28X32X20	28	32	20	IR120X130X30	120	130	30
IR28X32X30	28	32	30	IR120X135X45	120	135	45
IR30X35X13	30	35	13	IR130X145X35	130	145	35
IR30X35X16	30	35	16	IR130X150X50	130	150	50
IR30X35X17	30	35	17	IR140X155X35	140	155	35
IR30X35X20	30	35	20	IR140X160X50	140	160	50
IR30X35X20.5	30	35	20.5	IR150X165X40	150	165	40
IR30X35X26	30	35	26	IR160X175X40	160	175	40
IR30X35X30	30	35	30	IR170X185X45	170	185	45
IR30X37X18	30	37	18	IR180X195X45	180	195	45
IR30X37X22	30	37	22	IR190X210X50	190	210	50
IR32X37X20	32	37	20	IR200X220X50	200	220	50
IR32X37X30	32	37	30	IR220X240X50	220	240	50
IR32X40X20	32	40	20	IR240X265X60	240	265	60
IR32X40X36	32	40	36	IR260X285X60	260	285	60
IR33X37X13	33	37	13	IR280X305X69	280	305	69
IR35X40X17	35	40	17	IR300X330X80	300	330	80
IR35X40X20	35	40	20	IR320X350X80	320	350	80
IR35X40X20.5	35	40	20.5	IR340X370X80	340	370	80
IR35X40X30	35	40	30	IR360X390X80	360	390	80
IR35X42X36	35	42	36	IR380X415X100	380	415	100

Industrial Applications

IR Series Needle Roller Bearing Inner Rings are widely used in:

Agricultural machinery

Gearboxes

Electric motors

Pumps

Conveyor systems

Motorcycle components

Textile machinery

Automation equipment

They are especially suitable for compact designs where the shaft is not hardened and requires a dedicated raceway surface.

Why Use an Inner Ring Instead of Direct Shaft Running?

Item	Direct Shaft Surface	IR Inner Ring
Wear Resistance	Lower	Higher
Maintenance	Difficult	Easier
Running Stability	Less stable	More stable
Service Life	Shorter	Longer
Hardness Control	Depends on shaft	Fully controlled

Using a dedicated inner ring significantly improves long-term reliability and reduces maintenance costs.

OEM & Export Experience

Since 2004, BMT Bearings has supplied bearing components to global markets including Southeast Asia, Europe, South America, and the Middle East.

We support:

OEM customization

Laser marking

Private labeling & packaging

Drawing-based production

Tight tolerance requirements

Batch traceability

Installation Recommendations

To ensure optimal performance:

Avoid impact installation

Keep shaft and housing clean

Use proper lubrication

Ensure correct alignment

Proper lubrication and alignment often have more impact on service life than material alone.

Manufacturing Strength

With over 20 years of experience and ISO-certified production systems, BMT Bearings maintains stable manufacturing quality through:

Automated grinding lines

Strict inspection systems

Stable heat treatment control

Continuous process improvement

We focus on consistent performance across every shipment, not just sample quality.

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Contact Info

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Address

No.183,Longfeng,West of Zhangting industrial Zone,Yuyao,Ningbo,China
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Tel

+86-15990260649
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E-mail

info@demy-bearing.com

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