Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of spindle bearing b71919-e-t-p4s-ul in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.

Angular Contact Ball Bearing-Machine Tool Spindle Bearing-71919ACTAP4

Also know as 71919ACDGAP4A, B71919-E--T-P4S-UL

Technical Data

Inside Ø (mm):	95
Outside Ø (mm):	130
Width (mm):	18
Contact Angle:	25°
Rows Of Balls:	Single Row
Seal:	NBR
Ring Material:	GCr15, 100Cr6, SUJ2, X30
Rolling Element Material:	Steel
Cage Material:	Phenolic Resin
Tolerance Class:	P4S
Lubrication:	Oil or Grease
Product weight:	0.59 kg

Type	Dimensions					Abutment dimension				Weight	Load rating		Speed value
	mm					mm					N		r/min
	d	D	B	r (min)	r1 (min)	da	Da	ra (max)	ra1 (max)	m	C	Cor	Noil	Ngrease
95mm
71919 C	95	130	18	0.6	0.6	118.8	122.9	1.5	0.6	0.59	41000	47000	15000	11000
71919 AC	95	130	18	0.6	0.6	118.8	122.9	1.5	0.6	0.59	39000	44500	13000	9800
7019 C	95	145	24	1.5	0.6	129.2	135.1	1.5	0.6	1.20	77000	79000	14000	10500
7019 AC	95	145	24	1.5	0.6	129.2	135.1	1.5	0.6	1.20	72000	74500	12000	9000
7219C	95	170	32	2.1	1.1	110.5	154.0	2.1	1.1	2.72	128900	145100	12000	7500
7219 AC	95	170	32	2.1	1.1	110.5	154.0	2.1	1.1	2.72	122500	168300	10000	6700

71919ACTAP4 is a high-load, super-precision thin-wall angular contact steel ball spindle bearing widely used in medium and large high-speed spindle units. Each suffix defines its structural and performance attributes:

71919: Ultra-thin wall 719 series lightweight large-size bearing, compact cross-section, high rigidity-to-weight ratio, suitable for medium-large spindle installation space.

AC: 25° contact angle, greatly improved axial load capacity and comprehensive rigidity compared with 15° C-type, excellent for composite radial & axial cutting loads.

T: High-temperature resistant phenolic resin high-speed cage, low friction, high stability, anti-jitter under long-duration high-speed rotation.

A: Optimized internal raceway geometry, enhanced dynamic load rating and improved lubrication film formation.

P4: ISO P4 super precision grade, ultra-low runout, strict dimensional and rotational accuracy for high-end machine tool spindle standards.

Features

High Composite Rigidity & Load Resistance: 25° AC large contact angle design delivers outstanding axial stiffness and moment rigidity. It resists cutting deflection and overturning torque, suitable for medium-load continuous cutting that thin-wall 7000 series cannot bear.

Excellent High-Speed Stability: Optimized internal structure + low-resistance T-type cage reduces rolling friction and windage heat generation. It supports stable medium-high speed continuous operation with low temperature rise and low vibration.

Superior Precision Consistency: Strict P4 ultra-precision grinding ensures ultra-low radial and axial runout. It maintains long-term dimensional stability and repeat accuracy after long-cycle batch processing.

Good Lubrication Adaptability: Open optimized raceway structure fits oil mist and oil-air lubrication perfectly, avoiding oil accumulation and heat stagnation, realizing efficient heat dissipation and stable oil film lubrication.

Strong Fatigue & Impact Resistance: A-type enhanced internal design optimizes contact stress distribution, improves cyclic load fatigue resistance, and adapts to slight cutting impact in conventional precision machining.

Applications

Speed: Medium-high speed continuous operation, suitable for long-term stable rotation and frequent speed regulation scenarios.

Load: Dominated by medium composite radial and axial load, applicable for conventional precision finishing and semi-finishing cutting.

Lubrication: Matched with oil mist and oil-air precision lubrication systems.

Environment: Standard clean machining workshop environment, suitable for sealed spindle units to avoid dust and cutting fluid contamination.

Machine Tool Spindles

CNC lathes, milling machines, grinders, machining centers.

High-speed Rotating Equipment

High-speed motors, rotary tables, drilling machines.

Precision Machinery

Measuring instruments, optical equipment, precision testing devices.

Automation & Robotics

High-precision rotary joints and servo units.

Printing & Textile Machinery

High-speed rotating shafts in industrial production lines.

Advantages

∗ 30 years of dedicated development

HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.

∗ 2 high-tech R&D centers

∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.

∗ Supported by advanced digital MES and SPC management systems

∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications

∗ High-end equipment and high-quality material

About HXB

Hangzhou Factory - YJB

Founded in June 2007, YJB is located in Hangzhou. As a subsidiary of HXB Group, we are a national high-tech enterprise and provincial science & technology enterprise specializing in R&D and manufacturing of high-precision, high-speed, advanced, special and professional bearings.

Core Capabilities & Intelligent Manufacturing

Product Size: Inner diameter Φ3–Φ300mm
Precision Classes: P2, P4 (ultra-precision grades)
Annual Capacity: 3 million sets of precision bearings in a lean & intelligent factory
Equipment Investment: Over RMB 3 million in world-leading precision testing instruments
Digital Transformation: with full deployment of MESYS bearing design platform, ERP, MES, WMS, SPC real-time quality monitoring and OA systems, building a benchmark smart manufacturing plant.

Main Products

Precision Spindle Bearings
Angular Contact Ball Bearings

Servo Motor Bearings
Vacuum Pump Bearings
Ball Screw Support Bearings

Certificates

Exhibition

FAQ

Q1: What is the biggest difference between 71919ACTAP4 and small-size ultra-high-speed bearings?

A1: 71919ACTAP4 adopts 25° AC large contact angle and large-size thin-wall structure, focusing on medium-high speed + high rigidity + medium load resistance. It is suitable for semi-finishing and medium-load precision cutting. In contrast, small-size 7000 series with 15° angle focus on ultra-high speed and light-load finishing. 71919 has stronger anti-deformation ability and higher load threshold.

Q2: Why choose AC 25° contact angle for this model?

A2: The 25° contact angle greatly improves axial stiffness and composite load capacity. For medium-large spindles with obvious axial cutting force in actual machining, it can effectively resist spindle deflection and improve overall cutting stability, which is more suitable for industrial batch processing than 15° high-speed angle.

Q3: What lubrication mode is the most suitable for 71919ACTAP4?

A3: It is optimized foroil-air lubrication and oil mist lubrication. The open thin-wall structure ensures smooth lubricant circulation and heat dissipation, avoids heat accumulation under medium-load long-term operation, and maintains stable dynamic precision of the spindle.

Q4: Can this bearing be used for heavy roughing?

A4: Not recommended. Although it has high rigidity among thin-wall bearings, it is still a lightweight thin-wall series. It is suitable for medium-load semi-finishing and finishing, but long-term heavy impact roughing will cause raceway stress concentration and precision attenuation.

Q5: Does 71919ACTAP4 support factory pairing or SU self-pairing?

A5: This P4 super-precision large thin-wall bearing is recommended for factory professional DB/DT paired assembly. Large-size bearings have higher deformation sensitivity; factory unified tolerance screening and preload calibration avoid on-site pairing errors and ensure spindle overall rigidity consistency.