Description
Countersunk Bolt Wear Plates for Flush Liner Fixing
Countersunk bolt wear plates are cut-to-size and drilled wear-resistant steel liner panels designed for bolt-on installation where protruding bolt heads should be avoided. They are commonly used in transfer chutes, hopper liners, conveyor loading zones, impact areas and replacement wear liner packages.
EB China can supply drawing-based wear plates with countersunk holes, through holes, slotted holes, edge preparation and inspection according to buyer drawings, samples or site measurement data.
Typical Applications
| Application area | Use case | Why countersunk fixing helps |
|---|---|---|
| Mining transfer chutes | Replaceable wall and skirt liner plates | Flush bolt heads reduce direct abrasion and material hang-up |
| Hopper liners | Modular liner plates for impact and sliding wear zones | Bolted panels can be replaced during planned shutdowns |
| Conveyor loading zones | Wear plates near loading, sealing and sidewall areas | Smooth internal surface protects fasteners and improves flow |
| Crusher feed areas | Replaceable liners exposed to rock impact and sliding abrasion | Countersunk bolts reduce bolt-head damage in high-wear zones |
| Cement plant transfer points | Clinker, limestone, coal and raw material chute liners | Drawing-based panels improve repeat replacement accuracy |
Material Grade and Hardness Options
| Material option | Typical hardness reference | Recommended condition |
|---|---|---|
| NM400 wear plate | About 360-430 HBW | General abrasion with moderate impact and good toughness requirement |
| NM450 wear plate | About 420-480 HBW | Balanced abrasion resistance for chutes, hoppers and conveyor transfer points |
| NM500 wear plate | About 470-540 HBW | Severe sliding abrasion where impact is controlled |
| High chrome cast liner | Application-dependent cast hardness | Fine abrasive material and severe wear where cast geometry is preferred |
| Drawing-specified grade | According to buyer specification | Replacement liners requiring exact material traceability |
Processing Capability
| Processing item | Available work | RFQ information needed |
|---|---|---|
| Cut-to-size | Rectangular, trapezoid or drawing-based plate shapes | Overall dimensions, thickness and quantity |
| Drilled holes | Through holes, bolt holes and patterned fixing holes | Hole diameter, center distance and coordinate drawing |
| Countersunk holes | Flush bolt seat processing for countersunk fasteners | Countersink diameter, angle, depth and bolt type |
| Edge preparation | Beveled edge, chamfer, deburring and installation-ready edges | Required edge detail and installation clearance |
| Inspection | Drawing check, dimension inspection and hole pattern confirmation | Drawing revision, tolerance requirement and reference sample if available |
Countersunk Hole Design Checklist
Flush fixing is useful only when the countersink geometry matches the bolt, plate thickness and working condition. Before production, confirm the following items:
- plate thickness and minimum remaining thickness below the countersink;
- bolt head diameter, countersink angle and seating depth;
- edge distance from hole center to plate edge;
- access direction for bolt installation and removal;
- whether bolt heads face the main material flow path;
- replacement sequence for adjacent liner panels.
Thickness and Size Range
| Parameter | Common range | Notes |
|---|---|---|
| Plate thickness | Typical 6-50 mm, drawing-based | Selection depends on material grade, impact and wear life target |
| Panel size | Custom cut according to chute or hopper drawing | Large panels should be checked against access door and lifting method |
| Hole pattern | Single-row, multi-row or staggered hole layout | Hole position should avoid the strongest direct impact stream where possible |
| Fixing method | Countersunk bolt, standard bolt or mixed layout | Mixed fixing may be used for impact and sliding zones in the same chute |
Related Products and Technical Guides
For a complete liner package, countersunk plates can be supplied together with bolt-on chute liner plates, custom processed wear plates and NM500 wear plate. For design background, see Chute Liner Maintenance Access and Bolted Chute Liners vs Welded Chute Liners.
Standard RFQ Specification for Countersunk Bolt Wear Plates
The following ranges are practical quotation references for drawing-based countersunk wear plates. Final material grade, thickness, hole pattern and price should be confirmed from your drawing, bolt standard, handled material and shutdown replacement plan.
Recommended specification range
| Item | Quotation reference | Buyer should confirm |
|---|---|---|
| Material grade | NM400, NM450, NM500 or drawing-specified wear-resistant steel; cast liner options can be reviewed for special geometry. | Existing liner grade, target service life, impact level and whether welding or forming is required. |
| Hardness range | Reference: NM400 about 360-430 HBW, NM450 about 420-480 HBW, NM500 about 470-540 HBW. | Required certificate/hardness report and whether the application needs more toughness or higher abrasion resistance. |
| Thickness range | Common chute and hopper liner range: 8-40 mm; heavy impact or long-life panels can be reviewed up to 50 mm or drawing-specific thickness. | Current liner thickness, wear allowance, bolt head seat depth and remaining thickness under countersink. |
| Countersunk hole detail | Metric countersunk fasteners commonly use 90 degree seats; imperial flat-head screws often use 82 degree seats. EB China will follow the drawing or bolt standard. | Bolt size, head diameter, countersink angle, countersink depth, through-hole diameter and hole coordinate tolerance. |
| Panel layout | Single panel, modular liner set, staggered hole pattern, edge chamfer and drawing-number marking are available for quotation. | Panel ID, left/right orientation, installation sequence and access direction for wrench/bolt removal. |
Quote factors and price basis
| Price factor | Why it changes cost | RFQ note |
|---|---|---|
| Material grade and hardness | Higher hardness plates usually require stricter cutting, drilling and countersinking control. | State NM400 / NM450 / NM500 or provide the current liner material certificate. |
| Plate thickness and yield | Thicker plates increase raw material weight, cutting time and machining difficulty. | Send CAD/PDF drawings so nesting and waste rate can be estimated. |
| Hole count and countersink geometry | Each hole adds drilling/countersinking time and inspection work. | Provide a hole table with coordinates, diameter, countersink angle and depth. |
| Tolerance and inspection level | Tight hole-position tolerance or dimensional reporting requires additional QC time. | Specify general tolerance, critical dimensions and whether inspection photos/reports are required. |
| Quantity and delivery term | Small batches carry higher setup cost; repeat batches are easier to quote from approved drawings. | Send trial quantity, annual usage and destination port or delivery address. |
MOQ, lead time and documents
| Item | Typical planning reference | Notes |
|---|---|---|
| MOQ | Sample or trial batches can be reviewed by drawing; economic batch quotation is usually better from about 500 kg to 1 metric ton and above. | Small urgent replacement sets can still be evaluated if drawings and hole details are complete. |
| Lead time | Typical processed wear plate order: about 15-30 working days after drawing confirmation and deposit; urgent/simple parts can be reviewed separately. | Lead time depends on grade availability, thickness, hole count, inspection requirement and packing. |
| Documents | Material certificate, hardness reference, dimension inspection photos/report and packing photos can be supplied according to project requirement. | State document requirements before quotation so they are included in the price and schedule. |
| Packing | Export pallet or crate packing with rust protection, part labels and drawing-number marking. | Confirm gross weight limit per pallet and whether panels need sequence labels for installation. |
Fast quote checklist
- 2D/3D drawing, PDF, DXF or a clear sketch with dimensions;
- material grade, hardness requirement and plate thickness;
- overall size, quantity and part numbers;
- hole diameter, countersink angle, countersink depth and bolt standard;
- application equipment, handled material, impact/drop condition and existing wear life;
- destination country, delivery term and inspection document requirements.
Request a Quote
Send drawings, grade, thickness, countersink detail, hole pattern, quantity and application condition. EB China can review whether NM400, NM450, NM500 or another wear-resistant liner material is suitable for your chute liner replacement project.
Email: wear@ebcastings.com or use the contact form.
Send drawings for a custom chute liner quote
For faster review, send drawings, photos, material grade, thickness, hole pattern, quantity and application condition. We can quote custom chute liners, wear plates, bolt-on liner plates and processed liner parts based on your RFQ package.
Reviews
There are no reviews yet.