Description
Keyhole slot chute liner plates for drawing-based quick-position fastening and controlled installation direction.
Keyhole slot chute liner plates use a larger entry opening connected to a narrower retention slot. In a compatible fastening system, the entry opening passes over a defined bolt head or stud feature and the plate then moves into the retention direction for positioning.
These liners are custom components rather than universal drop-in parts. Slot geometry, head dimensions, plate thickness, movement direction, clamping method and locking arrangement must be reviewed together before production.
Faster initial positioning
A correctly designed keyhole slot can help a maintenance team place a liner over pre-positioned fasteners before final tightening or retention.
Direction-controlled design
The narrow slot direction must work against expected liner movement. Orientation arrows and part marks are important for installation.
How a keyhole slot liner works
The large end of the slot is the entry opening. The narrow connected section is the retention slot. During installation, the compatible fastener head or locating feature passes through the entry opening, after which the liner moves along the slot direction. The final clamping and anti-release method depend on the project design.
Typical specification details
| Item | RFQ information | Why it matters |
|---|---|---|
| Material | NM400, NM450, NM500 or drawing-specified wear plate. | Controls abrasion resistance and cutting requirements. |
| Plate thickness | Nominal target thickness and available installation clearance. | Affects slot edge thickness and fastener engagement. |
| Entry opening | Large-end diameter or complete profile dimensions. | Must pass the defined head or locating feature. |
| Retention slot | Width, length, end radius and transition profile. | Controls movement, fit and stress concentration. |
| Slot direction | Arrow showing installation and retention direction. | Prevents mirror-image or reversed parts. |
| Fastener system | Head diameter, shank diameter, washer, clamp, stud and locking detail. | Must be reviewed with the slot, not separately. |
| Hole layout | Center positions measured from stable datums. | Supports alignment with the chute structure. |
Where keyhole slot chute liners may be considered
- Replacement liner systems with pre-positioned compatible fasteners.
- Shutdown work where initial plate positioning time is important.
- Applications requiring directional slide-on placement before final retention.
- Chutes with limited rear access, subject to an approved fastening design.
- Part-marked modular liner arrangements with controlled installation sequence.
Keyhole slot dimensions for quotation
| Dimension | What to send | Buyer note |
|---|---|---|
| Large opening size | Diameter or X/Y profile dimensions. | Confirm the largest fastener feature that must pass through. |
| Narrow slot width | Finished width and dimensional tolerance. | Compare with the fastener shank or neck dimension. |
| Slot length | Distance from entry center to retention end. | Defines required sliding movement. |
| End radius | Radius at the narrow slot end and transition region. | Avoids an uncontrolled sharp internal corner. |
| Orientation | Entry end, retention end, wear face and flow direction. | Essential for left/right and upstream/downstream parts. |
| Edge distance | Distance from slot boundaries to plate edges. | Supports strength and layout review. |
Installation direction and material flow
The slot should not be oriented without considering gravity, material impact, vibration and expected liner movement. Mark the material-flow direction, upstream edge, downstream edge and final retention direction on the drawing. For mirrored chute walls, identify left-hand and right-hand parts separately.
Part marks and installation arrows can also support packing and site sequencing. The maintenance procedure should define how the plate is supported before final clamping and how unintended reverse movement is prevented.
Fastener and locking review
A keyhole slot may be used with different project-specific locating or fastening arrangements, but the complete assembly must be reviewed. Buyers should send the mating fastener drawing, not only the liner drawing.
| Assembly item | Information needed |
|---|---|
| Head or locating feature | Maximum diameter, thickness, shape and available clearance. |
| Shank or neck | Diameter, tolerance and length through the liner. |
| Clamping element | Nut, washer, clamp, wedge or other approved retention detail. |
| Anti-release feature | Method preventing reverse movement, loosening or plate lift-off. |
| Access | Front/rear tool access and planned installation sequence. |
| Inspection | Slot gauge, dimensions, assembly trial or installation photos required. |
Comparison with other fixing options
| Product | Main feature | Typical RFQ focus |
|---|---|---|
| Keyhole slot liner | Large entry opening plus directional retention slot. | Fastener-head fit, slide direction and anti-release design. |
| Slotted Hole Liner | Elongated slot for controlled positional adjustment. | Slot size, adjustment direction and washer coverage. |
| Bolt-On Liner | Conventional round-hole mechanical fastening. | Hole diameter, bolt grade, pitch and access. |
| Countersunk Liner | Flush fastener-head surface. | Countersink angle, depth and remaining section. |
| Plug Weld Liner | Weld access through prepared holes. | Hole pattern, welding procedure and removal plan. |
| Stud-Backed Liner | Hidden back-side fixing. | Stud layout, weld detail and rear access. |
Manufacturing and inspection notes
Keyhole slots can be cut according to approved drawings using a suitable profile-cutting or machining route. The transition between the large opening and narrow slot should be smooth and free of unintended notches. Dimensional inspection can include entry-opening size, narrow-slot width, overall length, center positions, orientation and edge distance.
For replacement projects, a simple mating gauge or sample fastener may help confirm fit. Buyers can request dimension photos, material records, part-mark photos and packing photos through the project quality plan.
RFQ checklist
- Complete liner drawing with material, thickness and outline.
- Keyhole entry-opening size and profile.
- Narrow-slot width, length, end radius and tolerance.
- Slot orientation, wear face and material-flow direction.
- Mating fastener or locating-feature drawing.
- Final clamping and anti-release arrangement.
- Hole-center datums, edge distance and quantity.
- Working conditions, impact, vibration and temperature.
- Required inspection, material and packing documentation.
Related technical resources
- How to Send Drawings for a Custom Chute Liner Quote
- How to Measure Chute Liners for Custom Replacement
- Chute Liner Inspection Checklist Before Shipment
- Quality Documents for Custom Chute Liners
- Manufacturing Capabilities
Related liner products
Keyhole slot projects may also involve Custom Processed Wear Plates, Modular Chute Liner Panels, Conveyor Transfer Point Wear Liners, Hopper Liners, NM400, NM450 and NM500 Wear Plate.
Send a keyhole slot liner drawing for review
Attach the liner drawing, mating fastener drawing, slot orientation, locking method, material grade, thickness, quantity and working conditions. We will review the complete assembly as a drawing-based RFQ.
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