Belt Conveyor Idler Roller Selection: CEMA Series, Load Rating, Bearing Life, and Failure Mode Guide

In bulk material handling, the idler roller is the most numerous and most frequently replaced component in any belt conveyor system. A single overland conveyor may carry 10,000 to 30,000 idler rollers across its full length. Despite their apparent simplicity — a steel tube rotating on a shaft supported by two bearings — idler rollers account for a disproportionate share of conveyor maintenance cost and unplanned downtime. In high-tonnage mining and cement operations, a single conveyor carrying 3,000–6,000 tonnes per hour cannot afford to stop for idler replacement. Yet idler failures — seized rollers, collapsed bearings, failed seals — are among the most common causes of belt damage, belt fires (from friction heat of a seized roller), and unplanned conveyor shutdowns.

The majority of premature idler failures trace back to one of three root causes: incorrect series selection (an undersized CEMA rating for the actual load), inadequate bearing specification (insufficient L10 life for the duty cycle), or seal failure from contamination ingress in dusty or wet environments. This guide provides the complete technical framework for selecting, specifying, and maintaining conveyor idler rollers across the full range of bulk material handling applications — from light aggregate conveyors to heavy-duty iron ore and coal mining systems.

Part 1: Idler Roller Types and Functions

A belt conveyor idler system consists of several distinct roller types, each serving a specific function in supporting and controlling the belt.

1.1 Carrying (Troughing) Idlers

Troughing idlers support the loaded (carrying) side of the belt and form the belt into a trough shape that contains the bulk material. A standard three-roll troughing idler set consists of:

• Two wing rolls (angled at 20°, 35°, or 45° to the horizontal)

• One centre roll (horizontal)

The trough angle determines the cross-sectional area of material the belt can carry:

• 20° trough: Lower capacity, used where belt stiffness or material characteristics prevent steeper troughing; standard for light-duty and older conveyor designs

• 35° trough: The most common standard in North American practice (CEMA standard); balances capacity with belt edge stress

• 45° trough: Maximum capacity for a given belt width; requires a more flexible belt; common in European and Australian heavy-duty mining conveyors

The centre roll carries approximately 70% of the total idler load in a standard three-roll set; the two wing rolls share the remaining 30% (15% each). This load distribution is critical for idler selection — the centre roll must be sized for the full centre roll load, not the average idler load.

1.2 Impact Idlers

Impact idlers are installed at the loading zone (the point where material falls onto the belt from a chute or transfer point). They replace standard troughing idlers in the loading zone and are designed to absorb the impact energy of falling material without transmitting damaging shock loads to the belt or the idler structure.

Impact idlers use rubber disc rings or rubber-cushioned rolls instead of plain steel tubes. The rubber absorbs impact energy and protects both the belt and the idler bearings from shock loading.

Impact idler selection criteria:

• The impact energy from falling material must be calculated and compared to the impact rating of the idler

• Impact idlers should extend for a minimum distance of 1.5–2.0 × the belt width beyond the loading point in each direction

• Idler spacing in the loading zone is typically reduced to 300–600mm (compared to 1,000–1,500mm for standard carrying idlers) to provide additional belt support

1.3 Return Idlers

Return idlers support the empty (return) side of the belt as it travels back to the loading point. Since the return belt carries no material load, return idlers are subjected to much lower loads than carrying idlers — typically only the belt weight plus the idler self-weight.

Return idler types:

• Flat return idlers: Single horizontal roll; the simplest and most common type

• V-return idlers: Two rolls in a V configuration (typically 10°); provides better belt training than flat return idlers

• Rubber disc return idlers: Rubber discs instead of a continuous steel tube; prevents material buildup on the return idler surface (critical for sticky materials like wet coal or clay)

Return idlers are typically one CEMA series lighter than the carrying idlers on the same conveyor — the lower load allows a smaller, lighter idler to be used.

1.4 Transition and Training Idlers

Transition idlers are installed at the head and tail pulleys where the belt transitions from the troughed carrying profile to the flat profile required to wrap around the pulley. They use progressively reduced wing roll angles (e.g., 20°, 10°, 0°) to allow the belt to flatten gradually without overstressing the belt edges.

Training idlers (self-aligning idlers) are installed at intervals along the conveyor to correct belt mistracking. They use a pivot mechanism that allows the idler frame to rotate slightly when the belt contacts the wing roll, steering the belt back to centre. Training idlers should be installed at 30–50m intervals on long conveyors and immediately after loading zones where belt mistracking is most likely.

Part 2: CEMA Idler Series — The Standard Rating Framework

The Conveyor Equipment Manufacturers Association (CEMA) has established the most widely used standard for idler selection in North America and internationally. The CEMA system classifies idlers into series based on their load-carrying capacity, with each series defined by a maximum allowable load per idler and a minimum bearing L10 life.

2.1 CEMA Series Definitions

The CEMA series ratings are based on bearing L10 life calculated at 500 rpm idler speed. For conveyors operating at higher belt speeds (and therefore higher idler rpm), the actual bearing life will be shorter than the tabulated value, and the idler series must be upgraded accordingly.

2.2 How CEMA Load Ratings Are Calculated

The CEMA idler load rating is based on the bearing L10 life equation:

Where:

= basic dynamic load rating of the bearing (N) — from bearing manufacturer's catalog

= equivalent dynamic bearing load (N) — calculated from the idler load

= idler rotational speed (rpm)

• The exponent is 3 for ball bearings (used in most idlers); 10/3 for roller bearings

For a CEMA D idler with a 6" (152mm) roll diameter, the bearing must achieve L10 ≥ 60,000 hours at 500 rpm under the rated load of 1,500 lbs (6.7 kN). The bearing selection must satisfy this requirement with the actual shaft deflection taken into account — shaft deflection reduces the effective bearing life by increasing the misalignment load on the bearing. [3]

2.3 The Critical Role of Shaft Deflection

Shaft deflection is one of the most important — and most frequently overlooked — parameters in idler selection. When an idler shaft deflects under load, the inner ring of the bearing tilts relative to the outer ring, creating a misalignment load that dramatically reduces bearing life.

The maximum allowable shaft deflection at the bearing seat is typically limited to 10 arc-minutes (0.167°) for standard deep-groove ball bearings. Exceeding this limit causes:

• Increased contact stress on one side of the bearing raceway

• Accelerated fatigue wear on the loaded side of the raceway

• Premature bearing failure — often 3–5× faster than the calculated L10 life

The shaft deflection at the bearing seat is:

For a simply supported shaft with a central point load:

Where:

= load on the roll (N)

= distance between bearing centres (mm)

= elastic modulus of steel (210,000 MPa)

= second moment of area of the shaft:

(mm⁴)

= shaft diameter at the critical section (mm)

Practical implication: A shaft that is undersized in diameter will deflect excessively under load, causing premature bearing failure even if the CEMA series load rating is not exceeded. This is why shaft diameter is as important as bearing selection in idler specification.

Part 3: Idler Load Calculation — Step by Step

3.1 Calculating the Idler Load

The load on a carrying idler is the sum of the material load and the belt weight distributed over the idler spacing:

Where:

= material load per unit length of belt (kg/m) =

= conveyor capacity (t/h)

= belt speed (m/s)

= belt weight per unit length (kg/m) — from belt manufacturer's data

= idler spacing (m)

Example: 2,000 t/h coal conveyor, belt speed 4.5 m/s, belt weight 35 kg/m, idler spacing 1.2m:

Converting to lbs:

This load falls within the CEMA C rating (max 1,000 lbs), but since the centre roll carries approximately 70% of the total load:

This is well within CEMA C (500 lbs per roll). However, if the belt speed is high (> 3.5 m/s), the idler rpm will exceed 500 rpm and the bearing life must be recalculated at the actual operating speed.

3.2 Idler RPM and Belt Speed Relationship

The idler rotational speed depends on the belt speed and the idler roll diameter:

Where:

= belt speed (m/s)

= roll outer diameter (m)

Example: Belt speed 4.5 m/s, 152mm (6") diameter roll:

Since the CEMA tables are rated at 500 rpm, the actual bearing life at 565 rpm is:

For high-speed conveyors (belt speed > 5 m/s), the idler rpm may be 30–50% above the 500 rpm rating basis, requiring either an upgrade to the next CEMA series or a bearing with a higher dynamic load rating.

3.3 Impact Load Calculation at Loading Zones

At the loading zone, the impact force from falling material must be added to the static material load:

Where:

= mass of the largest lump of material (kg)

= vertical velocity of the material at impact (m/s) =

= drop height (m)

= impact factor (typically 1.5–3.0 depending on material fragmentation)

For a 50kg lump of iron ore falling 2.0m:

The total load on the impact idler is the static load plus the dynamic impact load. Impact idlers in heavy mining applications (iron ore, coal, hard rock) should be specified at least two CEMA series above the standard carrying idlers — the impact loading can be 3–5× the static load.

Part 4: Bearing Selection for Conveyor Idlers

4.1 Bearing Types Used in Idlers

Three bearing types are commonly used in conveyor idlers, each with distinct advantages and limitations:

Deep-groove ball bearings (DGBB):

• The most common bearing type for conveyor idlers

• Low friction, suitable for high-speed operation

• Sensitive to shaft deflection — maximum allowable misalignment 10 arc-minutes

• Available in C3 and C4 internal clearance grades for conveyor applications (C3/C4 clearance compensates for thermal expansion and slight misalignment)

• Standard for CEMA B, C, and D idlers

Tapered roller bearings:

• Higher radial and axial load capacity than DGBB of the same bore size

• More tolerant of shaft deflection — can accommodate up to 2–4 arc-minutes misalignment without significant life reduction (much less sensitive than DGBB)

• Higher friction than DGBB — generates more heat at high speeds

• Standard in heavy-duty CEMA E and F idlers and in Australian/European heavy mining idlers

• The CEMA system was originally developed around tapered roller bearings, which explains why shaft deflection is not explicitly addressed in the CEMA standard — tapered rollers tolerate deflection that would destroy a DGBB

Spherical roller bearings:

• Self-aligning — can accommodate shaft deflection up to 1.5–2.5° without life reduction

• Highest load capacity of the three types

• Used in very heavy-duty idlers (large mining conveyors, high-impact loading zones)

• Higher cost than DGBB or tapered roller bearings

4.2 Bearing Grease Selection and Relubrication

Idler bearings are typically grease-lubricated for life — the bearing is packed with grease at assembly and sealed for the life of the idler. This means grease selection is critical: the grease must maintain its lubricating properties over the full design life of the idler (30,000–60,000 hours) without degrading, oxidizing, or washing out.

Recommended grease properties for conveyor idler bearings:

For conveyors in cold climates (ambient temperature < -10°C), use NLGI Grade 1 or a synthetic base oil grease to ensure the bearing rotates freely at startup — a stiff grease at low temperature can prevent the idler from rotating, causing belt damage from the stationary roller.

4.3 Bearing Life Adjustment for Operating Conditions

The basic L10 life calculated from the bearing load rating must be adjusted for actual operating conditions using the modified rating life equation (ISO 281):

Where:

= reliability factor (1.0 for 90% reliability; 0.53 for 95%; 0.33 for 99%)

= life modification factor accounting for lubrication condition (viscosity ratio

) and contamination level (

)

For a conveyor idler in a dusty coal handling environment:

(viscosity ratio) ≈ 1.0–2.0 (adequate lubrication)

(contamination factor) ≈ 0.1–0.3 (moderate contamination)

≈ 0.5–1.5 (contamination significantly reduces the life modification factor)

This means that in a dusty environment, the actual bearing life may be only 50–70% of the calculated L10 life even with correct bearing selection — emphasizing the critical importance of seal selection.

Part 5: Seal Selection — The Most Critical Decision for Service Life

In bulk material handling environments — coal, iron ore, limestone, cement, sand — the idler seal is the component that most directly determines idler service life. A bearing that would last 60,000 hours in a clean environment may fail in 2,000–5,000 hours if the seal allows dust and moisture to contaminate the grease.

5.1 Seal Types and Performance

Labyrinth seals (non-contact):

• Multiple interlocking labyrinth passages create a tortuous path that prevents dust ingress without contact friction

• Zero wear — the seal does not degrade over time

• Effective against coarse dust particles but less effective against fine dust (< 50 microns) and water ingress

• Standard for light to medium duty applications in dry environments

• Low running torque — no contribution to belt resistance

Contact lip seals (single or double lip):

• Rubber lip(s) contact the rotating shaft or end cap, creating a positive seal

• More effective than labyrinth seals against fine dust and water

• Generate friction heat — increases idler running temperature

• Wear over time — seal lip degrades, eventually losing contact and sealing effectiveness

• Standard for medium to heavy duty applications in wet or moderately dusty environments

Triple-lip or multi-stage contact seals:

• Three or more contact lips in series, with grease-filled cavities between lips

• The outermost lip excludes coarse contamination; the inner lips provide secondary and tertiary barriers

• Highly effective against fine dust, water, and slurry ingress

• Higher running torque — increases belt resistance by 5–15% compared to labyrinth seals

• Recommended for: coal handling (wet and dusty), iron ore, cement, potash, and other fine abrasive materials

Positive pressure purge seals:

• A small continuous flow of clean grease is pumped through the seal cavity, creating a positive pressure that prevents contamination ingress

• The most effective seal type for extreme environments (slurry, very fine dust, submerged operation)

• Requires a centralized lubrication system — not suitable for sealed-for-life idlers

• Used in specialized heavy mining applications

5.2 Seal Selection by Application

Part 6: Idler Spacing — Optimizing for Belt Sag and Load

6.1 Belt Sag and Its Consequences

Belt sag between idlers is the downward deflection of the loaded belt at the midpoint between two adjacent idlers. Excessive belt sag causes:

• Material spillage — the belt profile changes between idlers, allowing material to spill over the belt edges

• Increased rolling resistance — the belt must repeatedly flex over each idler, and greater sag means greater flexing energy loss

• Belt fatigue — repeated flexing accelerates belt carcass fatigue

The maximum allowable belt sag is typically limited to 1.5–2.0% of the idler spacing (i.e., for 1,200mm idler spacing, maximum sag = 18–24mm).

6.2 Idler Spacing Calculation

The maximum idler spacing to limit belt sag to the allowable value is:

Where:

= belt tension at the point of interest (N)

= maximum allowable sag (m) = 0.015 to 0.020 ×

= total load per unit length (N/m) =

Practical idler spacing guidelines:

Return idlers can be spaced more widely than carrying idlers because the return belt carries no material load — only the belt weight.

Part 7: Idler Failure Mode Analysis

7.1 Bearing Seizure (Frozen Idler)

Appearance: The idler roll stops rotating while the belt continues to move. The stationary roll causes rapid belt wear at the contact point and generates friction heat — a seized idler is a primary cause of belt fires on conveyors carrying coal or other combustible materials.

Root causes:

• Seal failure and contamination ingress: Dust or moisture enters the bearing, contaminates the grease, and causes abrasive wear of the bearing races until seizure

• Grease starvation: Insufficient grease quantity at assembly, or grease degradation over time, leaves the bearing running dry

• Overloading: Bearing load exceeds the rated capacity, causing accelerated fatigue and eventual seizure

• Corrosion: In wet environments, water ingress causes rust on the bearing races, increasing friction until seizure

Corrective action:

• Upgrade seal type (e.g., from labyrinth to triple-lip) for dusty or wet environments

• Verify grease quantity and type at assembly — use a grease with proven water resistance

• Verify idler load does not exceed CEMA series rating

• Implement regular idler inspection to identify seized rollers before belt damage occurs [1]

7.2 Shell (Tube) Wear

Appearance: The outer steel tube of the idler roll wears through, reducing the roll diameter and eventually exposing the shaft or end caps.

Root causes:

• Abrasive material contact: In return idlers, material carried back on the belt underside contacts the roll surface and abrades it

• Mistracking belt: A misaligned belt contacts the idler end cap or frame, causing accelerated wear at the belt edge

• Insufficient shell thickness: Undersized shell wall thickness for the abrasive material being conveyed

Corrective action:

• Use rubber disc return idlers for sticky or abrasive materials — the rubber discs shed material and resist abrasion

• Correct belt mistracking using training idlers

• Specify heavier wall thickness for abrasive applications (e.g., iron ore, hard rock)

7.3 Shaft Fracture

Appearance: The idler shaft fractures, typically at the bearing seat or at the weld between the shaft and the end cap.

Root causes:

• Fatigue from excessive shaft deflection: An undersized shaft deflects excessively under load, creating high cyclic bending stresses at the bearing seat that cause fatigue fracture

• Impact overloading: A large lump of material falling onto the idler at the loading zone creates an impact load that exceeds the shaft's fracture strength

• Corrosion fatigue: Corrosion pitting on the shaft surface acts as a stress concentration, initiating fatigue cracks at lower stress levels than a clean shaft

Corrective action:

• Verify shaft diameter is adequate for the actual load — calculate shaft deflection and ensure it is below 10 arc-minutes at the bearing seat

• Install impact idlers with rubber cushioning at all loading zones

• Use corrosion-resistant shaft materials (stainless steel or coated carbon steel) in wet environments

7.4 Roll Misalignment and Belt Mistracking

Appearance: The belt drifts to one side of the conveyor, contacting the idler frame or structure. In severe cases, the belt edge folds under and is damaged.

Root causes:

• Idler frame misalignment: The idler frame is not perpendicular to the belt travel direction — even a 1–2° misalignment causes consistent belt drift

• Uneven loading: Material is loaded off-centre, creating an uneven load distribution across the belt width that causes the belt to drift toward the heavier side

• Belt camber: The belt has a permanent curve (camber) from manufacturing or storage, causing it to track off-centre

Corrective action:

• Check and correct idler frame alignment — all idler frames must be perpendicular to the belt centre line (within ±0.5°)

• Install self-aligning (training) idlers at 30–50m intervals

• Correct loading chute alignment to ensure material is loaded on the belt centre line

7.5 Premature Bearing Failure (Flaking/Pitting)

Appearance: Noise and vibration from the idler; bearing disassembly reveals pitting, flaking, or spalling of the bearing races.

Root causes:

• Contamination fatigue: Fine abrasive particles in the grease cause three-body abrasive wear and accelerated contact fatigue

• Electrical erosion: On conveyors with stray electrical currents (near welding equipment or variable-frequency drives), electrical current passing through the bearing creates arc pitting on the races

• False brinelling: Vibration during transport or storage before installation causes fretting wear at the Hertzian contact points

Corrective action:

• Improve seal effectiveness to prevent contamination ingress

• Install insulated idler end caps or earthing brushes to prevent electrical erosion

• Store idlers horizontally and avoid vibration during transport — rotate idler rolls periodically during long-term storage

Frequently Asked Questions

Q1: What CEMA series should I specify for a heavy-duty coal conveyor?

For a coal conveyor carrying 2,000–4,000 t/h with belt widths of 1,200–1,800mm, CEMA D or E series is typically appropriate. Calculate the actual idler load using the formula:

, then compare to the CEMA series maximum load per roll (centre roll carries ~70% of total idler load). For belt speeds above 4 m/s, recalculate bearing life at the actual idler rpm — the CEMA tables are based on 500 rpm. In wet or dusty coal environments, always specify triple-lip contact seals regardless of CEMA series.

Q2: Why do idlers fail prematurely even when the CEMA series is correctly selected?

The most common cause is seal failure leading to bearing contamination — a correctly rated bearing in a contaminated grease environment may fail in 20–30% of its calculated L10 life. The second most common cause is shaft deflection exceeding the allowable limit for the bearing type: a shaft that deflects more than 10 arc-minutes at the bearing seat causes accelerated raceway fatigue even if the load is within the CEMA rating. Always verify both seal selection and shaft deflection, not just the CEMA series load rating.

Q3: What is the difference between CEMA B, C, D, and E idlers?

CEMA series defines the maximum load capacity and minimum bearing life of the idler. CEMA B (max 500 lbs/roll, L10 = 30,000 hrs) is for light-duty conveyors with narrow belts (450–600mm). CEMA C (max 1,000 lbs/roll, L10 = 30,000 hrs) suits medium-duty conveyors with 600–900mm belts. CEMA D (max 1,500 lbs/roll, L10 = 60,000 hrs) is the standard for heavy industrial conveyors (900–1,200mm belts). CEMA E (max 2,500 lbs/roll, L10 = 60,000 hrs) is for heavy mining conveyors with 1,200–1,800mm belts.

Q4: How do I select the correct troughing angle?

The troughing angle affects belt capacity and belt edge stress. A 35° trough is the CEMA standard and suits most applications. Use 45° when maximum capacity is required for a given belt width — but verify the belt is flexible enough (check the belt manufacturer's minimum troughing angle for the belt construction). Use 20° for stiff belts (steel-cord belts on long-distance conveyors) or for materials that do not flow well in a steep trough. The 45° trough increases capacity by approximately 15–20% over 35° for the same belt width and speed.

Q5: How often should conveyor idlers be inspected?

In heavy mining and bulk handling operations, a weekly walk-down inspection is recommended — listen for bearing noise (squealing or rumbling indicates bearing distress), check for seized rollers (a stationary roll that should be rotating), and check for visible shell wear or damage. Thermal imaging (infrared camera) is an effective tool for identifying seized or overloaded idlers — a seized idler generates significant heat that is easily detected by IR camera during operation. Replace any idler showing signs of seizure immediately — a seized idler can ignite a belt fire within minutes on a coal conveyor.

Q6: What roll diameter should I specify for a high-speed conveyor?

For high belt speeds (> 4.5 m/s), use the largest roll diameter practical for the belt width. A larger roll diameter reduces the idler rpm for a given belt speed, directly increasing bearing life. For example, upgrading from a 152mm (6") to a 178mm (7") roll diameter on a 5 m/s conveyor reduces idler rpm from 628 to 537 rpm — a 15% reduction that increases bearing life by approximately 20%. Larger roll diameters also reduce the belt flexing frequency, reducing belt fatigue and rolling resistance.

Yile Machinery: Custom Conveyor Idler Rollers and Components

Yile Machinery manufactures custom conveyor idler rollers, return rollers, impact rollers, and complete idler sets for bulk material handling applications in mining, cement, steel, and power generation. Our idlers are manufactured to CEMA dimensional standards and can be specified to CEMA B through F series load ratings.

Our idler manufacturing capabilities:

• Roll diameters: 89mm to 219mm (3.5" to 8.6"); custom diameters on request

• Belt widths: 500mm to 2,400mm (20" to 96")

• Shell materials: ERW steel tube (standard); seamless steel tube (heavy duty); rubber-lined (impact and return idlers)

• Shaft materials: 45# carbon steel (standard); 42CrMo alloy steel (heavy duty and impact idlers)

• Bearings: Deep-groove ball bearings (CEMA B–D); tapered roller bearings (CEMA D–F); spherical roller bearings (special heavy duty)

• Seals: Labyrinth (standard); double-lip contact (medium duty); triple-lip contact (heavy duty, wet/dusty); custom seal arrangements

• Surface treatment: Hot-dip galvanized; epoxy painted; rubber-coated; stainless steel (corrosive environments)

• CEMA series: B, C, D, E, F — certified load ratings and bearing life calculations provided with each order

Related products and technical resources:

• Customized Conveyor Drive Drum Belt Pulley — engineered drive, tail, and bend pulleys for bulk material handling systems

• Mining & Cement Industry Solutions — complete component supply for mining and cement plant conveyors

• Wire Rope Sheaves for Cranes and Excavators — precision-machined sheaves for material handling

• Industrial Helical & Bevel-Helical Gearbox Selection Guide — conveyor drive gearbox selection and service factor methodology

• Drum Coupling for Crane & Hoist Drives — drive couplings for conveyor head pulley shafts

• Heavy-Duty Forged Crane Wheels — forged steel wheels for conveyor transfer cars and material handling equipment

• Rolling Mill Rolls: Work Roll & Backup Roll Guide — related material handling component guide for steel plant conveyors

• Custom Forgings — Shafts, Gear Blanks & Ring Forgings — forged idler shafts and pulley shafts

To receive a quotation, provide:

• ✅ Belt width (mm or inches)

• ✅ Required CEMA series or load per idler (kg or lbs)

• ✅ Idler type (troughing / impact / return / transition)

• ✅ Troughing angle (20° / 35° / 45°)

• ✅ Belt speed (m/s) and conveyed material

• ✅ Environmental conditions (dusty / wet / corrosive / temperature range)

• ✅ Quantity and required delivery date

• ✅ Existing idler drawing or sample for reverse engineering

Email: jasmine@yileindustry.com

Submit RFQ: www.yilemachinery.com/contactus.html

All technical inquiries receive a response within 24 hours. Emergency replacement orders given priority scheduling.

Related Technical Resources

• Industrial Helical & Bevel-Helical Gearbox Selection Guide

• Wire Rope Sheave: Groove Design & D/d Ratio Guide

• Drum Coupling for Crane & Hoist: Torque Rating & Selection Guide

• Rolling Mill Rolls: Work Roll & Backup Roll Material Selection Guide

• Forged vs. Cast Steel Shafts for Crushers

• Custom Forgings — Gear Blanks & Ring Forgings

• Mining & Cement Industry Solutions

• Steel & Metal Processing Solutions