Rope Sheave Bearing E5052X NNTS1 Cylindrical Double Row Roller Bearing 260x400x190mm

1. Product Overview

E5052X NNTS1 belongs to E5000 series heavy-duty sheave dedicated double row cylindrical roller bearing, widely used for large crane pulley blocks, mining heavy conveying rollers and port lifting equipment. Suffix NNTS1 explanation: NN double row roller structure, T outer ring circlip positioning groove, S1 double-sided contact rubber lip sealing.

Standard metric overall dimensions: inner bore d=260mm, outer diameter D=360mm, total width B=130mm. Adopts double row line contact cylindrical roller layout, greatly improves radial static load and impact resistance, suitable for long-term suspended heavy load intermittent operation. Integrated outer ring precision turning circlip groove, matched standard retaining ring to limit axial movement of pulley during lifting operation, simplifies pulley frame assembly positioning.

All bearing rings and cylindrical rollers are made of fully quenched GCr15 bearing steel with ultra-precision mirror grinding arc raceway. Equipped with double-layer contact rubber sealing structure, effectively block outdoor dust, mud, rain splash and metal mineral debris, avoid internal grease loss and roller corrosion. Widely matched tower crane, truck crane, mine conveyor, port container lifting pulley rotating assemblies.

2. Technical Specifications

3. Core Advantages

• Large-size E5052X heavy-duty pulley exclusive double row roller design, ultra-high static load bearing capacity, perfectly adapt long-time suspended heavy load working condition of large lifting pulley.
• S1 double-sided double lip contact sealing system, multi-layer dust and water isolation, greatly reduce grease leakage and roller rust failure in mining and open-air construction sites.
• Outer ring integrated T-type circlip positioning groove, standard circlip realizes reliable axial limit, no additional positioning sleeve needed, reduce pulley assembly processing cost.
• Double row cylindrical roller line contact stress dispersion structure, evenly absorb impact load generated by hoist start, stop and heavy cargo lifting, prevent raceway surface peeling and fatigue crack.
• Overall quenching heat treatment, surface hardness up to HRC60~65, excellent anti-fatigue and wear resistance, extend maintenance cycle of large crane pulley blocks.
• Factory pre-filled high-viscosity anti-wear lithium complex grease, adapt low-speed intermittent lifting operation, extend regular refueling maintenance interval.
• Universal unified pulley installation dimensions, fully interchangeable with original E5000 series large sheave bearings, no modification to pulley frame during maintenance replacement.
• Full set of customized services: manganese phosphate anti-rust surface treatment, OEM laser marking on outer ring, neutral export wooden case anti-rust packaging, high temperature resistant special grease filling.

4. Application Scenarios

E5052X NNTS1 double row sealed heavy sheave roller bearing is core ultra-heavy static load rotating spare part for lifting and mining conveying machinery:

• Large tower crane, mobile heavy truck crane main pulley block support bearing assemblies
• Port container lifting gantry crane, ship heavy load hoist pulley matching units
• Underground mine heavy material conveyor roller, mining hoist large sheave transmission positions
• Heavy industrial overhead crane, metallurgy lifting equipment big pulley rotating components
• Aftermarket interchangeable E5000 series large size sealed heavy pulley roller bearing
• Cost-effective outdoor dust-proof ultra-high load sheave bearing solution for crane maintenance factories, mining machinery OEM and port lifting equipment bulk procurement.

5. Why Choose GQZ Bearing

• 25 years professional manufacturing experience of E5000 series large sealed double row sheave roller bearings including E5052X NNTS1
• E5052X NNTS1 fully dimensionally interchangeable with international standard heavy pulley bearings, consistent static load rating, double lip sealing performance and circlip groove assembly tolerance standards.
• Complete OEM & ODM customization service supporting manganese phosphate anti-corrosion coating, special high temperature grease filling and custom surface laser marking.
• Strict full pre-delivery inspection procedures: GCr15 raw material hardness test, roller dimensional sorting screening, long-cycle ultra-heavy static load aging test, repeated lifting alternating impact fatigue wear test.
• Professional heavy lifting machinery pulley bearing engineering team provides one-on-one large crane pulley model matching, grease grade selection and circlip assembly installation technical guidance within 24 working hours.
• Stable large-scale mass production workshop with competitive direct factory bulk wholesale price for long-term crane spare parts suppliers, mining conveying equipment manufacturers and port lifting machinery dealers.
• We specialize in double row ultra-heavy load pulley bearing structure, all-weather double lip sealing design, outer ring integrated circlip positioning layout and long-term win-win cooperation with global heavy lifting and mining conveyor machinery spare parts buyers.

6. Quality Control

• Raw material chemical composition and hardness inspection for GCr15 bearing steel inner ring, outer ring and roller blanks
• Precision forging, quenching & tempering, ultra-mirror finish arc raceway grinding processing for large bearing inner and outer rings
• Cylindrical roller high-temperature quenching, superfinishing and automatic high-precision dimensional sorting production line
• Double lip sealing press fitting and outer ring circlip groove precision turning process, strictly control sealing interference and retaining ring matching clearance
• Classified targeted performance testing: E5052X NNTS1 long-cycle ultra-heavy static load aging test, repeated heavy cargo lifting impact fatigue test, dust & water splash long-term sealing durability detection
• Full dimensional tolerance and surface defect recheck before anti-rust oil coating and export wooden case packaging shipment
• Each production batch of E5052X NNTS1 bearings passes full sampling large pulley simulation heavy static load rotation test to guarantee stable long-term ultra-high load dust-proof support performance in large crane, mining and port lifting pulley equipment.

7. Get A Quote Now

If you need E5052X NNTS1 double row sealed heavy-duty sheave cylindrical roller bearings for large tower crane pulley maintenance and mining port lifting equipment OEM bulk matching, send your purchase inquiry directly.

You will receive full professional supporting services after submitting inquiry:

• Fast official factory formal quotation reply within 24 hours
• One-on-one large crane pulley model matching, grease grade selection and circlip installation technical guidance from professional heavy lifting machinery bearing engineers
• Customized bearing performance solutions including manganese phosphate anti-rust coating and high-temperature resistant grease upgrade options
• Competitive direct factory bulk wholesale price for large-volume spare parts orders
• Provide your required purchase quantity, lifting/mining equipment model and open-air heavy dust/water splash working environment to obtain detailed sealed formal quotation document.

8. FAQ

1. Q1: What is the meaning of each suffix of E5052X NNTS1?
   A1: NN = double row cylindrical roller structure; T = outer ring integrated circlip positioning groove; S1 = double-sided double lip contact rubber seal, resistant to outdoor dust and water splash.
2. Q2: What advantages does double row structure have over single row pulley bearings?
   A2: Double row line contact roller layout greatly improves dynamic and static load capacity, can bear ultra-heavy suspended cargo load of large cranes, stronger anti-impact performance during frequent lifting start and stop.
3. Q3: Can E5052X NNTS1 directly replace original imported large pulley bearings?
   A3: Yes, boundary dimensions, load parameters and circlip groove size are fully consistent with standard E5000 series heavy sheave bearings, no pulley frame modification required during replacement.