Drawn Cup Needle Roller Bearings

Demy Bearings manufactures Drawn Cup Needle Roller Bearings with customized dimensions, thin‑walled outer ring structures, high‑precision GCr15 bearing steel, and specialized heat treatment for mechanical equipment.

Ningbo Demy (D&M) Bearings Co., Ltd. has over 20 years of experience in high‑precision bearing manufacturing, holding ISO 9001:2000 and IATF 16949:2016 quality certifications with an annual capacity exceeding 100 million sets.

It utilizes cold‑formed outer ring technology and hardened needle rollers. It combines a line‑contact roller structure, press‑fit housing design, and optimized radial clearance for automotive transmissions, electric motors, power tools, and industrial automation.

Structure Features

Thin Stamped Outer Ring

The thin‑walled outer ring structure allows direct press‑fit installation into housing bores, minimizing overall radial dimension requirements while maintaining structural integrity.

Line‑Contact Roller Geometry

Long cylindrical needle rollers replace point‑contact balls, substantially increasing the contact surface area with the raceway to handle significant radial loads smoothly.

Optimized Press‑Fit Assembly

Designed for interference fit mounting, the thin outer ring conforms to the housing bore, eliminating the need for retaining rings or complex axial positioning components.

Material and Quality Control

GCr15 Bearing Steel and Heat Treatment

Manufactured from high‑carbon chromium bearing steel (GCr15 / equivalent), the rollers and raceways undergo stabilized heat treatment to ensure uniform hardness distribution, wear resistance, and long‑term dimensional stability.

Automated Manufacturing Excellence

BMT Group operates 100 sets of automatic grinding and assembly lines. Dimensional accuracy, roller roundness, surface finish, and running noise are strictly monitored to meet standard and EMQ‑grade requirements.

Product Specifications

Item	Specification
Product Name	Drawn Cup Needle Roller Bearings
Brand	Demy Bearings / BMT
Material	High‑Carbon Chromium Bearing Steel (GCr15)
Precision Class	High Precision / EMQ Grade
Structure	Thin‑walled outer ring with needle rollers & cage assembly
Certifications	ISO 9001:2000, IATF 16949:2016
Annual Production Capacity	100,000,000 sets/year
Customization	Non‑standard sizes, laser marking, custom grease, OEM options

Technical Parameters (HK Series Representative Models)

Bearing Model	Fw (mm)	D (mm)	C‑0.3 (mm)	r min. (mm)	Basic Dynamic Load Rating Cr (kN)	Basic Static Load Rating Cor (kN)
HK0408	4	8	8	0.3	1.69	1.24
HK0609	6	10	9	0.4	2.71	2.47
HK0810	8	12	10	0.4	3.61	3.75
HK1012	10	14	12	0.4	5.23	6.46
HK1212	12	18	12	0.8	6.18	6.94
HK1516	15	21	16	0.8	9.98	13.68
HK2016	20	26	16	0.8	12.07	19.10
HK2520	25	32	20	0.8	18.91	31.35
HK3020	30	37	20	0.8	20.90	37.53
HK4020	40	47	20	0.8	22.95	46.80

Technical Parameters (NK Series Representative Models)

Bearing Model	Inner Diameter (d) (mm)	Outer Diameter (D) (mm)	Width (H) (mm)	Dynamic Load Rating Cr (kN)	Static Load Rating Cor (kN)
NK 5/12	5	12	12	5.8	6.2
NK 8/20	8	20	20	12.1	13.0
NK 10/22	10	22	22	14.6	16.0
NK 15/30	15	30	30	22.0	24.8
NK 20/40	20	40	40	35.0	39.5
NK 25/47	25	47	47	42.5	48.0

Application Areas

Drawn Cup Needle Roller Bearings are suitable for compact gearboxes, motorcycle transmissions, electric power tools, automotive steering systems, agricultural machinery drives, industrial automation systems, and conveyor rollers where radial load is dominant and space is strictly limited.

Bearing Selection Comparison Guide

Performance Feature	Standard Ball Bearings	Drawn Cup Needle Roller Bearings
Radial Load Capacity	Moderate	High
Envelope Space Requirement	Larger	Minimal / Compact
Internal Contact Type	Point Contact	Line Contact
Heavy‑Duty Continuous Operation	Higher Wear Risk	Distributed Load / High Stability
Housing Bore Integration	Requires Retaining Features	Press‑Fit Design

Production Process and Quality Inspection

The manufacturing workflow encompasses raw material inspection, precision cold‑forming of drawn cups, heat treatment and surface hardening, roller grinding and sorting, automated cleaning and assembly, radial clearance testing, 100% vibration and noise testing, and final packaging inspection.

OEM Customization

Demy Bearings accepts custom orders tailored to specific industrial requirements.

• Customization Scope: Non‑standard sizes, specialized radial clearance, custom grease formulations, laser surface etching, and private packaging.

• Samples & Lead Time: Pre‑production samples available; standard production lead time ranges between 15 to 30 days depending on volume.

• Payment Terms: Standard B2B terms arranged via 30% T/T deposit with 70% balance prior to shipment.

Factory Corporate Strength

Founded in 2004 by Mr. Dylan Min, BMT Group operates a 30,000 m² modern manufacturing zone (Ningbo Giant Bearings Manufacturing Co., Ltd.) equipped with 100 fully automated grinding and assembly lines. With over 20 years of development, the company maintains advanced measuring instruments, robust R&D capabilities, and an annual production volume exceeding 100 million pieces.

Shipping Options

Shipping Method	Suitable Situation
Sea Freight	Cost‑effective option for large‑volume OEM production orders and regular shipment cycles.
Air Freight	Recommended for medium quantities or time‑sensitive industrial delivery needs.
Express Delivery	Ideal for urgent sample orders, testing batches, or critical replacement parts.

FAQ

Q1: What is the primary advantage of a Drawn Cup Needle Roller Bearing over a standard ball bearing?

A: Drawn cup needle roller bearings utilize line‑contact cylindrical rollers housed within a thin‑walled outer ring. This structure dramatically reduces radial envelope space while delivering a significantly higher radial load capacity compared to point‑contact ball bearings.

Q2: Can Demy Bearings customize non‑standard sizes or specific lubricants for OEM orders?

A: Yes, Demy Bearings (BMT Group) provides comprehensive OEM services, including non‑standard size customization, specific grease selection for extreme temperatures or speeds, custom radial clearances, laser logo marking, and specialized packaging.

Q3: What are the key installation requirements to prevent premature bearing failure?

A: Proper shaft and housing bore tolerances are critical for correct press‑fit seating. Ensure correct insertion force without impact loads, maintain proper lubrication intervals, and prevent shaft misalignment during assembly.

Q4: What certifications does your factory hold for quality assurance?

A: BMT Group operates under strictly enforced quality management systems certified to ISO 9001:2000 and IATF 16949:2016 standards, backed by 100% 

Technical Parameters

	SIZE(mm)				Basic load rating
bearing model	Fw	D	C –0.3	r min.	Basic load rating Cr KN	Basic load rating Cor KN
HK0408	4	8	8	0.3	1.69	1.24
HK0509	5	9	9	0.4	2.28	1.89
HK0606	6	10	6	0.4	1.53	1.16
HK0608	6	10	8	0.4	1.93	1.57
HK0609	6	10	9	0.4	2.71	2.47
HK0709	7	11	9	0.4	2.95	2.8
HK0808	8	12	8	0.4	2.61	2.47
HK0810	8	12	10	0.4	3.61	3.75
HK0908	9	13	8	0.4	3.37	3.56
HK0910	9	13	10	0.4	4.04	4.42
HK0912	9	13	12	0.4	5.04	5.99
HK1010	10	14	10	0.4	4.18	4.85
HK1012	10	14	12	0.4	5.23	6.46
HK1015	10	14	15	0.4	6.46	8.36
HK1210	12	16	10	0.4	4.7	5.89
HK1212	12	18	12	0.8	6.18	6.94
HK1312	13	19	12	0.8	6.46	7.51
HK1412	14	20	12	0.8	6.75	8.08
HK1512	15	21	12	0.8	7.51	8.93
HK1516	15	21	16	0.8	9.98	13.68
HK1522-ZW	15	21	22	0.8	12.73	18.53
HK1612	16	22	12	0.8	7.22	9.22
HK1616	16	22	16	0.8	10.36	14.54
HK1622-ZW	16	22	22	0.8	12.45	18.43
HK1712	17	23	12	0.8	7.51	9.79
HK1812	18	24	12	0.8	7.7	10.36
HK1816	18	24	16	0.8	11.02	16.44
HK2010	20	26	10	0.8	6.08	7.79
HK2012	20	26	12	0.8	8.17	11.5
HK2016	20	26	16	0.8	12.07	19.1
HK2020	20	26	20	0.8	14.92	24.7
HK2030-ZW	20	26	30	0.8	20.71	38
HK2210	22	28	10	0.8	7.13	9.98
HK2212	22	28	12	0.8	8.65	12.73
HK2216	22	28	16	0.8	12.73	21
HK2220	22	28	20	0.8	15.68	27.55
HK2512	25	32	12	0.8	10.45	14.44
HK2516	25	32	16	0.8	14.82	22.8
HK2520	25	32	20	0.8	18.91	31.35
HK2526	25	32	26	0.8	24.23	42.75
HK2538-ZW	25	32	38	0.8	32.3	62.7
HK2816	28	35	16	0.8	15.58	25.18
HK2820	28	35	20	0.8	19.86	34.2
HK3012	30	37	12	0.8	11.5	17.29
HK3016	30	37	16	0.8	16.34	27.55
HK3020	30	37	20	0.8	20.9	37.53
HK3022	30	37	22	0.8	23.56	43.7
HK3026	30	37	26	0.8	26.6	51.3
HK3038-ZW	30	37	38	0.8	35.63	75.05
HK3220	32	39	20	0.8	20.7	38.25
HK3224	32	39	24	0.8	24.75	48.6
HK3512	35	42	12	0.8	11.79	19.17
HK3516	35	42	16	0.8	16.83	30.15
HK3520	35	42	20	0.8	21.42	41.4
HK4012	40	47	12	0.8	12.6	21.87
HK4016	40	47	16	0.8	18	34.65
HK4020	40	47	20	0.8	22.95	46.8
HK4512	45	52	12	0.8	13.41	24.75
HK4516	45	52	16	0.8	19.17	38.7
HK4520	45	52	20	0.8	24.3	53.1
HK5020	50	58	20	0.8	27.9	56.7
HK5025	50	58	25	0.8	34.65	75.6
HK5520	55	63	20	0.8	28.35	60.3
HK5528	55	63	28	0.8	39.6	92.7
HK6012	60	68	12	0.8	15.66	28.8
HK6020	60	68	20	0.8	30.15	67.5
HK6032	60	68	32	0.8	47.7	121.5