7016 P5 Precision Bearings for Industrial Robot

• Customization: Available
• Rolling Body: Ball Bearings
• The Number of Rows: Single
• Model NO.: 70 Series
• Outer Dimension: Multiple Sizes Available
• Material: Chrome Steel
• Spherical: Non-Aligning Bearings
• Load Direction: Radial & Axial Bearings
• Separated: Unseparated
• Transport Package: Stardard
• Specification: Stardard
• Trademark: Rock
• Origin: Luoyang
• HS Code: 8482500090
• Production Capacity: 5000 Pieces/Year
• Package Size: 42.00cm * 34.00cm * 14.00cm
• Package Gross Weight: 5.700kg
• Lead Time: 7 days (1 - 1 Pieces) ; To be negotiated ( > 1 Pieces)

Product Description

70 Series Single Row Angular Contact Ball Bearings
Precision Grades P5 / P4 / P2  |  15° / 25° / 40° Contact Angles  |  For CNC Spindles & High-Speed Precision Equipment
Luoyang Rock Precision Bearing Co., Ltd.  

1. Product Description

70 series bearings are single-row angular contact ball bearings. The raceways are designed so that the contact line between the balls and raceways forms an angle with the radial plane - the contact angle. This geometry allows the bearing to carry both radial and unidirectional axial loads simultaneously. The larger the contact angle, the higher the axial load capacity; the smaller the angle, the higher the permissible speed. These bearings are non-separable and are typically mounted in pairs (DB / DF / DT) or as universal-matched sets for bidirectional axial location
We supply three standard contact angles: 15° (suffix C) for maximum speed, 25° (suffix AC) for balanced speed and axial rigidity, and 40° (suffix B) for heavy axial loads. All bearings are manufactured to ISO 492 tolerances with precision grades from P5 to P2. Bore diameter range: 10 mm - 320 mm. Standard models 7000-7032 are available from stock or on short lead time; larger and non-standard sizes on request

2. Product Images
 

 

3. Why Choose Our 70 Series Bearings

• P2 / P4 / P5 Precision: Made to ISO 492 tolerances. P4 and P5 are standard stock items; P2 made-to-order. Every bearing is 100% inspected for runout, dimensional accuracy, and noise before shipment.
• High Speed Capability: The 15° C-type with optimized ball guidance and phenolic / polyamide cage achieves limiting speeds up to 32,000 rpm (7000C) with grease and even higher with oil-air - ideal for high-frequency spindles and grinding heads.
• Multiple Contact Angles & Matched Sets: 15° (C), 25° (AC), 40° (B) available. We supply pre-matched DB / DF / DT pairs and universal-matched sets (UL / UO) with controlled light / medium / heavy preload - ground to precise width tolerances for direct mounting.
• Low Noise & Vibration: Balls graded to G5 / G10; raceways super-finished to Ra ≤ 0.05 μm. Vibration values in Z3 / Z4 group, noise below 45 dB - critical for high-precision surface finish.
• Cage & Material Options: Machined brass (M), phenolic resin (TPA), polyamide (TN), or pressed steel cages. Hybrid ceramic Si3N4 balls available for ultra-high-speed (+30% speed) and electrical insulation. W33 oil groove, 2RS seals, S1-S3 heat stabilization on request.
• Factory Direct & Traceable: In-house manufacturing in Luoyang from forging to assembly. ISO 9001 certified. Full material traceability by heat number; every bearing laser-marked with part number and batch code.

4. Technical Specifications

 

Item	Detail
Bearing Type	Single Row Angular Contact Ball Bearing (70 series)
Contact Angles	15° (suffix C), 25° (suffix AC), 40° (suffix B)
Precision Grades	P2 / P4 / P5 (ISO 492); P0 / P6 on request
Bore Diameter	10 mm - 320 mm (larger sizes on request)
Ring & Ball Material	GCr15 / SUJ2 / 100Cr6 bearing steel
Hybrid Option	Si3N4 silicon nitride ceramic balls (suffix HC / CE)
Hardness	HRC 58-64 (rings); HRC 60-66 (balls)
Cage Material	Machined brass (M), Phenolic resin (TPA), Polyamide (TN), Pressed steel
Operating Temperature	-30 °C to +120 °C (standard); up to +250 °C with S1-S3
Lubrication	Grease, oil bath, oil-air / oil-mist; W33 oil groove; 2RS sealed option
Radial Clearance	C1, C2, Normal, C3 (ISO 5753)
Raceway Surface Finish	Ra ≤ 0.05 μm (P4 / P2); Ra ≤ 0.1 μm (P5)
Arrangements	Single, DB, DF, DT, universal matched sets (UL / UO)
Preload Classes	Light (A / UL), Medium (B), Heavy (C) - factory-set
Standards	ISO 492, ISO 5753, GB/T 307.1; ABEC / RBEC equivalent

5. How to Read the Part Number

Example: 7005 C / P4 / TPA / UL - 25 mm bore, 15° contact angle, P4 precision, phenolic resin cage, universal light-preload matched set.

Code	Meaning
70	Single-row angular contact ball bearing, dimension series 0 (light section)
05	Bore code: 05 × 5 = 25 mm (00-03: 10/12/15/17 mm; 04-99: code × 5 mm)
C / AC / B	Contact angle: C = 15° (high speed), AC = 25° (balanced), B = 40° (high axial load)
P4 / P5 / P2	Precision grade per ISO 492
TPA / M / TN	Cage: TPA = phenolic resin (outer ring riding), M = machined brass, TN = polyamide
UL / UO	Universal matched set: UL = light preload, UO = zero clearance
DB / DF / DT	Matched arrangement: DB = back-to-back, DF = face-to-face, DT = tandem
W33	Oil groove + 3 oil holes in outer ring
2RS / HC	2RS = double rubber seal; HC = hybrid ceramic Si3N4 balls
C1/C2/C3 / S1-S3	Radial clearance classes; heat stabilization for +150 / +200 / +250 °C

6. Model & Dimension Table - 70C Series (15° Contact Angle)

Units: d, D, B, rs in mm; Cr, Cor in kN; speeds in rpm; weight in kg. Speeds are reference values for standard grease / oil lubrication at normal temperatures. AC-type (25°) load ratings are ~5-8% lower and speeds ~10-15% lower; B-type (40°) load ratings ~10-15% lower and speeds ~25-35% lower. Need a model not listed? Send us your drawing.

Model	d	D	B	rs min	Cr	Cor	Grease	Oil	Weight
7000C	10	26	8	0.3	4.9	2.1	24000	32000	0.019
7001C	12	28	8	0.3	5.4	2.6	22000	28000	0.021
7002C	15	32	9	0.3	6.2	3.3	19000	25000	0.030
7003C	17	35	10	0.3	6.6	3.6	16000	22000	0.040
7004C	20	42	12	0.6	10.4	6.0	14000	19000	0.064
7005C	25	47	12	0.6	11.6	7.4	12000	17000	0.074
7006C	30	55	13	1.0	15.1	10.2	9500	14000	0.110
7007C	35	62	14	1.0	18.2	12.7	8500	12000	0.150
7008C	40	68	15	1.0	19.7	14.9	8000	11000	0.180
7009C	45	75	16	1.0	25.9	20.2	7500	10000	0.230
7010C	50	80	16	1.0	26.6	21.8	6700	9000	0.250
7011C	55	90	18	1.1	38.9	29.5	6000	8000	0.380
7012C	60	95	18	1.1	40.9	33.1	5600	7500	0.400
7013C	65	100	18	1.1	40.1	35.3	5300	7000	0.430
7014C	70	110	20	1.5	48.3	43.1	5000	6700	0.600
7015C	75	115	20	1.5	49.6	45.9	4800	6300	0.630
7016C	80	125	22	1.5	58.9	54.7	4500	6000	0.850
7017C	85	130	22	1.5	58.1	55.9	4300	5600	0.890
7018C	90	140	24	2.0	71.7	68.7	4000	5300	1.150
7019C	95	145	24	2.0	73.5	73.1	3800	5000	1.200
7020C	100	150	24	2.0	74.4	72.5	3800	5000	1.250
7022C	110	170	28	2.1	101.4	100.3	3400	4600	1.950
7024C	120	180	28	2.1	108.6	110.7	2800	3800	2.100
7026C	130	200	33	2.1	129.4	134.7	2600	3400	3.330
7028C	140	210	33	2.1	153.4	160.5	2400	3200	3.460
7030C	150	225	35	2.1	183.9	194.2	2200	3000	4.800
7032C	160	240	38	2.1	200.1	219.4	2000	2800	5.260

7. Contact Angle Comparison

The contact angle determines the balance between speed capability and axial load capacity.

Parameter	C (15°)	AC (25°)	B (40°)
Axial Load Capacity	Low	Medium	High
Limiting Speed	Highest	Medium	Lowest
Relative Speed (vs C)	100%	~85%	~65%
Spindle Axial Rigidity	Lower	Good	Highest
Friction / Heat	Lowest	Medium	Highest
Typical Use	High-speed CNC spindles, grinding heads, high-frequency motors	General machining centers, pumps, gearboxes	Heavy axial load, screw drives, injection molding

8. Precision Grade Comparison

Representative tolerance values for bore d = 50-80 mm (7010 to 7016). Values vary by diameter range.

Parameter	P5	P4	P2	Unit
Bore dia. variation (Δdmp)	0 / -10	0 / -6	0 / -3	μm
Inner radial runout (Kia)	6	3	1.5	μm
Outer radial runout (Kea)	7	3.5	2	μm
Width variation (VBs, max)	8	5	2.5	μm
Ball grade	G10	G5	G5	-
Raceway roughness (Ra)	≤ 0.1	≤ 0.05	≤ 0.025	μm
Typical Use	General precision spindles, motors, pumps	CNC machining centers, high-precision grinding	Ultra-precision grinding, aerospace, metrology

9. Materials & Construction

Rings and balls are made from GCr15 (SUJ2 / 100Cr6) high-carbon chromium bearing steel from certified mills, with full material certificates and heat-number traceability. Rings are martensitic quenched and tempered to HRC 58-64; balls to HRC 60-66. S1 (+150 °C), S2 (+200 °C), and S3 (+250 °C) heat-stabilized versions are available for high-temperature use. For corrosion-resistant applications, 9Cr18 (440C) stainless steel is available.
Balls are lapped to G5 / G10 precision with surface roughness Ra ≤ 0.025-0.05 μm. Raceways are super-finished to Ra ≤ 0.05 μm (P4/P2) or Ra ≤ 0.1 μm (P5). Smooth surfaces mean less friction, less noise, and longer life - critical in high-speed spindles where lubrication film is thin.

9.1 Cage Options

 

Cage Type	Suffix	Material	Best For	Max Temp
Machined brass	M / MB	CuZn39Pb3	Heavy loads, high temp, aggressive oils - most durable	+250 °C
Phenolic resin	TPA / TA	Phenolic fabric	Ultra-high speed spindles, low friction, oil-air lubrication	+120 °C
Polyamide	TN	PA66-GF25	High speed, low cost, low noise - general-purpose	+120 °C
Pressed steel	-	Low-carbon steel	Cost-effective for standard-load, moderate-speed use	+180 °C

9.2 Hybrid Ceramic Balls (Optional)

For ultra-high-speed applications, Si3N4 silicon nitride ceramic balls offer:

• Higher Speed: 60% lighter than steel - reduces centrifugal force, increases limiting speed by up to 30%
• Insulation: Electrical insulator - prevents electrical pitting in motor / generator applications
• Less Heat: Lower friction and heat - extends grease life and bearing service life

9.3 Available Options

• W33 oil groove + 3 oil holes; 2RS double rubber seals; ZZ metal shields
• C1 / C2 / C3 radial clearance; S1 / S2 / S3 heat stabilization
• DB / DF / DT pre-matched sets; UL / UO universal matched sets
• Phosphating, black oxide, or anti-rust coating; custom dimensions to drawing

10. Arrangement & Preload

Single-row angular contact ball bearings carry unidirectional axial load only. For bidirectional location or increased capacity, bearings are mounted in pairs. We supply factory-matched sets verified for width difference and preload force.

Arrangement	Code	Characteristics	Typical Use
Back-to-back	DB	Good moment rigidity, tolerant of misalignment, stable at high speed	CNC machining centers, general spindles
Face-to-face	DF	Lower moment rigidity, easier mounting	Shorter shafts, lower rigidity requirements
Tandem	DT	Double axial load in one direction; must pair with another bearing for reverse	High axial load, screw drives, vertical spindles
Universal	UL / UO	Interchangeable widths - any two from same batch can be paired DB/DF/DT; factory-set preload	High-volume production, easy replacement

Preload eliminates internal clearance and increases rigidity. Too little causes runout; too much generates heat and shortens life.

Preload Class	Code	Speed	Rigidity	Typical Application
Light	A / UL	Highest	Lower	Ultra-high-speed grinding, finishing, high-frequency spindles
Medium	B	Good	Good	General CNC machining centers, milling, moderate cutting
Heavy	C	Lower	Highest	Heavy-duty roughing, lathes, boring mills

11. Where These Bearings Are Used

• Machine tool spindles - CNC lathes, machining centers, boring mills, grinding machines
• High-frequency motors and electric spindles - high-speed grinding, routing, drilling
• Precision grinding machines - surface, cylindrical, tool & cutter, centerless grinders
• Rotary tables and indexing heads
• Pumps and compressors - centrifugal pumps, vacuum pumps, screw compressors
• Electric motors, generators, and turbo machinery
• Robotics and automation - precision rotary joints, harmonic drives
• Aerospace and defense - gyroscopes, actuators, turbine engines
• Medical equipment - dental handpieces, surgical tools, CT / MRI components
• Textile machinery - high-speed spinning and twisting spindles

12. Quality Control & Certifications

Certification	What It Covers	What It Means for You
ISO 9001:2015	Quality management system	Consistent quality, documented processes, continuous improvement
ISO 14001:2015	Environmental management	Responsible manufacturing, regulatory compliance
IATF 16949	Automotive quality (applicable lines)	Automotive-grade process control, PPAP / APQP capability
RoHS / REACH	Hazardous substance restriction	EU compliance - safe to sell and distribute globally

Quality is checked at every step:

• Raw material: spectrometer verifies chemical composition; hardness and inclusion rating per heat number.
• Forging & turning: 100% dimensional check on blanks; SPC monitoring.
• Heat treatment: hardness tested every batch; microstructure verified.
• Grinding: in-process gauging of bore, OD, width, raceways; roundness and roughness measured.
• Assembly & final: clean room assembly; 100% dimensional and runout check per ISO 492; noise and vibration tested; matched sets verified for preload force.
• Traceability: laser-marked part number and batch code; records kept for at least 5 years.

Key inspection equipment: roundness / cylindricity instrument (0.02 μm), CMM, surface roughness tester, bearing vibration analyzer, noise testing chamber, hardness testers, optical spectrometer, clean room assembly (Class 10,000 / ISO 7), preload testing machine, ball diameter sorter (0.5 μm).

13. Packaging & Shipping

Each bearing is individually wrapped in VCI anti-rust paper, packed in labeled boxes with part number and batch code, then placed in double-wall corrugated cartons with desiccant. Cartons are secured on ISPM 15 fumigated wooden pallets. Matched sets are packaged together with set identification and preload class marking. Neutral or custom-branded packaging available on request.

Item	Detail
MOQ	No strict MOQ for standard models. Sample orders (1-10 pcs) welcome.
Lead Time - Standard	7-15 working days (subject to stock)
Lead Time - P2 / Custom / Matched	25-45 working days
Samples	Free samples for established buyers; freight collect or prepaid
Incoterms	EXW, FOB, CIF, CFR, DDP - all supported
Loading Ports	Shanghai, Ningbo, Qingdao, Shenzhen
Payment	T/T (30% deposit, 70% before shipment), L/C at sight, Western Union, Trade Assurance
Shipping	Sea (LCL / FCL), air, express (DHL / FedEx / UPS)

14. Our Advantages

• Factory direct: In-house manufacturing in Luoyang - forging, turning, heat treatment, grinding, super-finishing, and assembly. No middlemen, better prices, full process control.
• Precision specialist: We focus on P2 / P4 / P5 super-precision angular contact ball bearings for machine tool spindles. This is our core product, not a side line.
• Matched set expertise: Dedicated matching and preload testing equipment. Our matched sets are verified for width difference and preload force - not just randomly paired. Universal matched sets are our specialty.
• 100% final inspection: Every bearing checked for dimensions, runout, noise, and vibration before shipment. ISO 9001 certified. Full material traceability.
• Custom engineering: R&D team designs non-standard bearings to your drawing - special dimensions, contact angles, materials, coatings, or clearance configurations.
• Fast technical support: Engineers reply within 24-48 hours with selection help, mounting guidance, lubrication advice, preload recommendations, and failure analysis. Small batches and samples accepted; OEM / private labeling supported.

15. FAQ

Q: What is the difference between 70C, 70AC, and 70B?
A: The suffix indicates the contact angle. C = 15° (highest speed, lowest axial load), AC = 25° (balanced), B = 40° (lowest speed, highest axial load). For most CNC spindles, the 15° C-type is recommended for maximum speed. Choose AC when axial loads are significant, and B for heavy thrust applications.
Q: What does "universal matched" mean?
A: Universal matched bearings (suffix UL or UO) are ground to very tight width tolerances so any two from the same batch can be paired in any arrangement (DB, DF, or DT) without further adjustment. We offer light preload (UL) and zero clearance (UO) universal sets.
Q: Can you make P2 grade? How long does it take?
A: Yes, P2 is available for most 70 series sizes from 7004 to 7030. P2 requires extra grinding, super-finishing, and stricter ball selection, so lead time is usually 25-45 working days. Contact us early for P2 projects.
Q: Should I choose all-steel or hybrid ceramic bearings?
A: Choose hybrid ceramic (Si3N4 balls) when operating speed exceeds 70-80% of the all-steel limiting speed, electrical insulation is needed (motor/generator), or grease life is a concern due to high heat. Choose all-steel when cost is primary, shock loads are significant (ceramic can fracture under heavy shock), or speeds are moderate.
Q: How do I select the right preload?
A: Light preload (Class A / UL) for ultra-high-speed finishing and grinding where heat is the main concern. Medium (Class B) balances speed and stiffness for general milling. Heavy (Class C) maximizes rigidity for heavy-duty roughing but reduces limiting speed. When in doubt, start with light or medium - excessive preload is a common cause of premature failure.
Q: What lubrication do you recommend for high-speed spindles?
A: For maximum speed, oil-air or oil-mist lubrication is best - it delivers precise oil to the contact zone while compressed air cools the bearing. Bearings with W33 (oil groove + 3 holes) are designed for this. For moderate speeds, high-speed spindle grease (lithium complex or polyurea) works well. Always follow your machine builder's specification.
Q: Do you provide inspection certificates and do OEM?
A: Yes. Every shipment can include a Certificate of Conformity (COC); matched sets include preload verification data. Detailed dimensional reports and material certificates (EN 10204 3.1 / 3.2) available for a fee. For OEM, we can laser-mark your brand and part number and use custom packaging - all covered by a confidentiality agreement.
16. Factory Environment
 

17. Contact Us
Send us your inquiry - part number, quantity, precision grade, contact angle, and any special requirements (matched sets, hybrid ceramic, seals, etc.). We'll get back to you within 24 hours with a quotation and technical recommendation.
Send Your Inquiry Today - Factory Price, Guaranteed Precision, Fast Delivery
Note: Dimensions, load ratings, and speeds are typical reference values. Actual performance depends on specific model, contact angle, precision grade, lubrication, mounting, preload, and operating conditions. Please confirm exact data with us before ordering.