NJ326EM Single-Row Cylindrical Roller Bearing Overview
The NJ326EM (also specified in customer inquiries and OEM parts lists as NJ326ECMC3, NJ 326 ECM/C3, NJ 326 ECML/C3, NJ326-E-XL-M1-C3) is a heavy-duty single-row cylindrical roller bearing in the ISO NJ3 dimension series with boundary dimensions of 130 mm × 280 mm × 58 mm (130×280×58 mm), raceway envelope diameter Fw = 167 mm, and a catalog reference mass of 19.5 kg. Featuring two integral outer-ring ribs, one integral inner-ring rib (NJ design), and a heavy-duty machined brass cage (M / EM), it delivers a basic dynamic load rating of 615 kN and a basic static load rating of 735 kN.
ZQM Bearings supplies the NJ326EM cylindrical roller bearing in both standard normal radial clearance (C0) and C3 radial internal clearance (matching NJ326ECMC3 requirements) for global distributors, gearbox OEMs, and industrial MRO buyers.
| Core Attribute | Specification | Engineering Note |
|---|---|---|
| Controlled Model | NJ326EM (NJ326EM) | Covers inquiry code NJ326ECMC3 (EM/M brass cage + C3 clearance) |
| Bearing Type | Single-Row Cylindrical Roller Bearing (NJ Design) | Separable inner ring; supports heavy radial load & unidirectional axial location |
| Boundary Dimensions (d × D × B) | 130 mm × 280 mm × 58 mm (Fw = 167 mm) | ISO 15 / DIN 5412-1 metric dimension series NJ3 |
| Load Ratings & Mass | Cr = 615 kN · C0r = 735 kN · Mass = 19.5 kg | Verified against ZQM controlled engineering database |
NJ326EM Technical Specifications (130×280×58 mm)
The following dimensional, load rating, speed, and abutment parameters are dynamically synchronized with the ZQM Bearings controlled engineering database to ensure 100% consistency with our online catalog:
Data source: ZQM Bearings controlled model database. Verify shaft/housing fits (da, db, Da), internal clearance and drawing requirements before ordering.NJ326EM Technical Specifications & Dimensions
Parameter Category Technical Parameter (Symbol) Catalogue Value Boundary Dimensions & Weight Bore diameter (d) 130 mm Boundary Dimensions & Weight Outside diameter (D) 280 mm Boundary Dimensions & Weight Width (B) 58 mm Boundary Dimensions & Weight Roller set under-raceway diameter (Fw) 167 mm Boundary Dimensions & Weight Reference mass (Weight) (mass) 19.5 kg Load Ratings & Limiting Speeds Basic dynamic load rating (Cr) 615 kN Load Ratings & Limiting Speeds Basic static load rating (Cor) 735 kN Load Ratings & Limiting Speeds Limiting speed (grease) (grease) 1800 rpm Load Ratings & Limiting Speeds Limiting speed (oil) (oil) 2200 rpm Abutment & Fillet Dimensions Shaft abutment diameter (db) 149 mm Abutment & Fillet Dimensions Housing abutment diameter (Da) 258 mm Abutment & Fillet Dimensions Minimum chamfer dimension (r12) 4 mm Abutment & Fillet Dimensions Minimum flange chamfer (r34) 4 mm Abutment & Fillet Dimensions Maximum fillet radius (ra) 3 mm Abutment & Fillet Dimensions Maximum flange fillet radius (rb) 3 mm
Designation Breakdown & Structural Features (NJ326EM / NJ326ECMC3)
Understanding the suffix nomenclature between standard catalog code NJ326EM and customer inquiry code NJ326ECMC3 ensures accurate technical interchangeability:
| Code Segment | Structural Meaning | Application & Interchange Impact |
|---|---|---|
NJ |
Two integral ribs on outer ring, one integral rib on inner ring | Locates shaft axially in one direction while permitting separable mounting |
326 |
ISO Dimension Series NJ3 · Bore d = 130 mm | Bore code × 5 = 130 mm nominal bore diameter |
E / EM / M |
Reinforced roller complement (E) + Machined brass cage (M) | Equivalent in load and cage metallurgy to SKF ECM / ECML and FAG E-XL-M1 |
C3 (on inquiry NJ326ECMC3) |
Radial internal clearance greater than Normal (C0) | Prevents preload under heavy interference fits and high-speed thermal gradients |
Typical Industrial Applications & Operating Conditions
With a dynamic load rating of 615 kN and static load rating of 735 kN, the NJ326EM (130×280×58 mm) is widely deployed across heavy industrial power transmission and rotating equipment:
| Industry Sector | Typical Equipment & Position | Operating Load Profile |
|---|---|---|
| Medium & Large Industrial Gear Drives | High-load helical and bevel-helical gearbox shafts where reinforced E-design roller complement delivers 615 kN dynamic radial load capacity. | Heavy radial load, high radial stiffness & thermal axial float |
| High-Voltage Electric Motors & Compressors | Heavy rotor shafts in industrial blowers, screw compressors, and medium-voltage motors requiring C0 or C3 radial internal clearance. | Heavy radial load, high radial stiffness & thermal axial float |
| Cement Kiln & Mining Slurry Pumps | Heavy-duty centrifugal slurry pumps, crusher drive shafts, and screen exciters operating under combined radial and one-direction axial location loads. | Heavy radial load, high radial stiffness & thermal axial float |
| Oilfield & Heavy Construction Equipment | Mud pump pinion shafts, winch gearboxes, and heavy mechanical power transmissions demanding machined brass cage durability. | Heavy radial load, high radial stiffness & thermal axial float |
Clearance, Cage & Bore Configuration Options
When ordering NJ326EM or matching an RFQ for NJ326ECMC3, confirm the following configuration parameters prior to dispatch:
| Configuration Item | Available Options | Selection Guidance |
|---|---|---|
| Radial Internal Clearance | C0 (Normal) · C3 · C4 |
Specify C3 when matching NJ326ECMC3 or when mounting with heavy shaft interference fits |
| Cage Design | M / EM (Machined Brass) · ECP (Polyamide) |
Machined brass cage provides superior mechanical strength under shock, vibration, and high acceleration |
| Bore & Groove | Cylindrical Bore · Standard NJ Rib Geometry | Verify shaft fillet radius ra ≤ 3 mm and shoulder diameter db ≥ 149 mm |
Brand Cross-Reference & Interchangeability (NJ326EM / NJ326ECMC3)
All brands listed below share identical ISO 15 boundary dimensions (130 mm × 280 mm × 58 mm), while suffix letters vary by manufacturer internal design and cage/clearance code:
| Brand / Standard | Equivalent Designation | Design & Suffix Notes |
|---|---|---|
| ZQM Bearings | NJ326EM / NJ326EM C3 | Machined brass cage; available in C0 or C3 clearance |
| Customer Inquiry Code | NJ326ECMC3 | Direct dimensional interchange (130×280×58 mm); C3 radial clearance |
| SKF | NJ 326 ECML/C3 / NJ 326 ECM/C3 (NJ326ECMC3) | SKF Explorer series equivalent |
| FAG / Schaeffler | NJ326-E-XL-M1-C3 / NJ326-E-M1 | X-life / standard machined brass cage design |
| NSK | NJ326EM / NJ326EM C3 | High-capacity machined brass cage specification |
| NTN | NJ326EG1C3 / NJ326E | Heavy-duty industrial specification |
| Timken | NJ326EMA | Brass cage heavy industrial series |
Procurement & Pre-Order Verification Checklist
To receive a fast, accurate quotation from ZQM Bearings for NJ326EM (or NJ326ECMC3), please include the following details in your inquiry:
| Verification Item | Required Information | Why It Matters |
|---|---|---|
| 1. Exact Designation & Suffix | State NJ326EM or NJ326ECMC3 (confirm C0 vs. C3 clearance) |
Ensures internal radial clearance and cage type match your operating temperature and fit |
| 2. Order Quantity & Usage | Batch quantity (e.g., trial order, MRO replacement, or scheduled OEM delivery) | Allows us to allocate production/stock batches and optimize export crate packaging (unit mass: 19.5 kg) |
| 3. Inspection & Documentation | Dimensional inspection report, material certificate, or clearance test sheet | Available upon request prior to shipment for quality verification |
| 4. Destination & Incoterms | Target port/country and preferred terms (EXW, FOB, CIF, or air/express freight) | Enables accurate freight calculation and lead-time confirmation |
Frequently Asked Questions (NJ326EM / NJ326ECMC3)
Q1: Can ZQM NJ326EM replace NJ326ECMC3 directly?
Yes. Both share the exact ISO boundary dimensions of 130 mm × 280 mm × 58 mm. When your inquiry or equipment manual specifies NJ326ECMC3, simply request NJ326EM with C3 radial clearance (machined brass cage M/EM matches SKF ECM) so both mounting dimensions and internal operating clearance are 100% matched.
Q2: What are the exact mounting shoulder and fillet dimensions for NJ326EM?
According to our controlled engineering database, the minimum chamfer dimension r1,2 min is 4 mm, maximum shaft/housing fillet radius ra max is 3 mm, minimum shaft abutment diameter db min is 149 mm, and maximum housing abutment diameter Da max is 258 mm.
Q3: What is the unit weight of NJ326EM for freight calculation?
The catalog reference mass of a single NJ326EM bearing is 19.5 kg (excluding export wooden case or pallet weight).
