Crocodile Mouth Anti-Skid Plate vs. Traditional Checker Plate: A Complete Industrial Walkway Comparison

Traditional checker plate has been used for decades on factory walkways, equipment platforms, steel stairs, vehicle steps and maintenance passages.

Its popularity is easy to understand. The material is widely available, can be cut and welded by most fabrication workshops, and usually has a lower initial purchase price than a formed safety-grating system. For dry indoor access routes with limited traffic and minimal contamination, checker plate may still provide a practical flooring option.

Industrial operating conditions, however, have become more demanding.

Modern facilities increasingly evaluate walking surfaces according to contaminated-condition traction, water and oil drainage, maximum intended load, dead load on the supporting structure, corrosion exposure, cleaning requirements, maintenance access, replacement frequency, installation efficiency and whole-life cost.

OSHA requires walking-working surfaces to support their maximum intended load and to be maintained free from recognized hazards such as corrosion, leaks, spills, snow and ice. The UK Health and Safety Executive also explains that water, oil, dust and other forms of contamination are involved in many workplace slip incidents. See OSHA 1910.22 and HSE contamination guidance.

Crocodile mouth anti-skid plate offers a different structural approach.

Instead of relying on shallow embossed patterns on a solid sheet, it uses raised serrated openings, through-drainage holes, repeated three-dimensional traction points, integral cold-formed side channels, and modular fastening and replacement.

It is also known as Grip Strut safety grating, fish-scale anti-slip plate, serrated perforated plank, crocodile mouth safety grating, raised-hole anti-skid walkway and industrial drainage flooring.

For a detailed explanation of its geometry and production process, see our internal crocodile mouth anti-skid plate guide.

1. The Fundamental Structural Difference

The difference between checker plate and crocodile mouth plate begins with the way the walking surface is formed.

Traditional checker plate

Checker plate is a solid metal plate with a raised diamond, bar or teardrop pattern rolled or pressed into one side.

Its main characteristics are a closed and continuous surface, shallow raised pattern, relatively simple cutting and welding, high material content per square meter, no direct through-drainage, and load performance based primarily on plate thickness and support spacing.

The raised pattern increases surface texture under suitable conditions, but water, oil, mud and debris remain above the plate until they flow toward an edge or drain.

Crocodile mouth anti-skid plate

Crocodile mouth plate is punched and formed so that part of the metal rises above the original surface.

Each opening creates a drainage path through the sheet, raised serrated footwear-contact points, a local three-dimensional reinforcing profile, reduced material weight, and an open surface for ventilation and light passage.

The plate is normally bent into a channel-shaped plank. The side channels add structural depth and provide surfaces for bolts, clips or custom brackets.

The result is not simply a perforated sheet. It is a formed industrial flooring component that combines the walking surface and supporting profile.

Where the walkway provides permanent access to machinery, project designers may need to review ISO 14122-2:2016. For cold-formed metal planks used as industrial flooring or stair treads, BS 4592-3 may also be relevant.

2. Drainage Performance

Drainage is one of the clearest differences between the two products.

Checker plate: surface drainage only

Checker plate has no open area. Rainwater, machine coolant, oil, mud and cleaning water must travel across the solid surface before reaching a floor drain, channel, open edge, collection pit or manually cleaned area.

If the plate is not installed with an effective slope, liquid can remain in low areas. Even when the surface is sloped, contamination may still be retained by welded joints, distorted panels, structural settlement, surface irregularities, mud deposits, damaged coatings, temporary hoses and equipment.

A checker pattern does not remove the contaminant. It remains beneath the footwear until it is drained or cleaned away.

Crocodile mouth plate: through-drainage

The open structure allows liquid to fall directly below the walking surface. This can reduce standing water, continuous oil films, mud spreading, rainwater ponding, cleaning water retention and surface contamination depth.

Water does not need to travel across the full walkway width before leaving the pedestrian level.

This is particularly valuable on outdoor industrial stairs, wastewater platforms, oil and gas maintenance routes, food-processing washdown areas, power-plant access walkways, vehicle loading steps, port and marine infrastructure, and open factory platforms.

The area beneath the plate must still be designed to collect or discharge the liquid safely. Through-drainage should not direct wastewater onto electrical equipment, personnel or sensitive machinery.

A crocodile mouth plate should therefore be treated as part of a complete drainage system rather than a substitute for drainage engineering.

The HSE notes that people rarely slip on clean, dry floors and that even small amounts of contamination can create a serious problem on smoother surfaces. See HSE slip prevention overview.

3. Traction in Wet, Oily and Muddy Conditions

How checker plate creates friction

Checker plate depends on shallow embossed ribs or diamonds. When dry and relatively clean, these raised features can provide useful surface texture.

Performance can decline when oil covers the pattern, mud fills the low spaces, water forms a continuous film, the raised areas become polished, corrosion damages the profile, paint fills the embossed pattern, or metal particles become compacted between the ribs.

The shoe may then contact the contamination rather than the raised metal. The practical condition of the floor is therefore more important than its appearance when new.

How crocodile mouth teeth create traction

Crocodile mouth plate uses raised serrated teeth that extend significantly above the original sheet surface.

The teeth can engage the tread of industrial footwear and create multiple contact points across the walking direction.

This structure may provide stronger contact where the surface is exposed to rain, oil mist, mud, sludge, dust, ice fragments, loose process residue and wet cleaning conditions.

The open holes also reduce the amount of liquid remaining beneath the shoe.

This does not mean that the product is impossible to slip on. Slip risk still depends on footwear, contaminant type, contaminant thickness, walking speed, lighting, stair geometry, surface maintenance, installation quality and worker behavior.

NIOSH states that workplace falls can occur across industries and are preventable. See NIOSH Falls in the Workplace and NIOSH slip, trip and fall prevention.

4. Traction Durability and Surface Wear

A frequently repeated marketing claim is that checker plate loses all anti-slip performance after one or two years. That statement is too absolute.

Actual wear life depends on plate material, pattern height, traffic frequency, vehicle movement, abrasive contamination, cleaning methods, corrosion, coating thickness, footwear and maintenance.

A lightly used checker plate in a dry indoor area may remain functional for many years. A heavily trafficked painted plate in an oily or abrasive environment may deteriorate much faster.

Wear behavior of checker plate

The shallow raised pattern can gradually become polished, rounded, covered by coatings, flattened by vehicle traffic, damaged by corrosion or filled with debris.

Restoring the original embossed profile is difficult. Common repair measures include abrasive coatings, welded traction bars, anti-slip tape, additional grating and complete panel replacement.

These modifications may improve the surface, but they do not add through-drainage.

Wear behavior of crocodile mouth plate

Crocodile mouth openings have a deeper three-dimensional shape.

The serrated profile is part of the formed metal rather than a separate coating. This can provide more persistent traction than shallow embossed markings under demanding conditions.

However, the raised teeth can still be damaged by heavy vehicle wheels, dragged equipment, impact, incorrect installation, severe corrosion, excessive load, abrasive blasting and unauthorized grinding.

High-traffic areas should be inspected for bent teeth, deformation and loss of section.

For detailed information about the serrated structure, see our Grip Strut walkway grating guide.

5. Structural Weight and Supporting-Steel Load

Checker plate weight

A solid plate contains metal across its full area. Its weight is determined by material density, plate thickness, panel width and panel length.

Large checker-plate panels can create significant dead load on steel beams, platforms, stair stringers, support columns, existing roof structures and elevated maintenance frames.

The weight also affects manual handling, crane requirements, installation personnel, transport cost, removal during maintenance and replacement speed.

Older facilities may require support-frame reinforcement before heavier plates are installed.

Crocodile mouth plate weight

Crocodile mouth plate removes material through punching while using formed channels to regain structural depth.

Depending on the exact design, this can reduce dead load compared with a solid plate of similar outside dimensions.

The weight reduction is not automatically a fixed percentage. It must be calculated from open area, metal thickness, material grade, channel depth, plank width, edge configuration, additional brackets, end plates and toe boards.

Statements such as 40% lighter should only be used when supported by a direct weight comparison between two specified products.

Structural performance is not determined by weight alone

A lighter plank is not necessarily suitable for a longer span.

Final performance depends on maximum intended load, concentrated load, uniformly distributed load, support spacing, channel depth, fastener arrangement, deflection limit, dynamic movement, corrosion allowance and the number and size of cutouts.

OSHA defines maximum intended load as the combined load of employees, equipment, vehicles, tools, materials and other loads reasonably expected on the surface at one time. See OSHA definitions.

The buyer should request load tables, deflection data and project-specific calculations where required.

6. Corrosion Resistance

Neither checker plate nor crocodile mouth plate is automatically corrosion-resistant.

Corrosion performance depends primarily on base metal, coating system, exposure, water chemistry, chloride concentration, temperature, cleaning agents, wet-and-dry cycles, crevices, fastener compatibility and maintenance.

Checker plate corrosion concerns

A solid checker plate may retain water, mud or chemical residue on its upper surface.

Corrosion may develop around welds, cut edges, drainage low points, bolt holes, overlapping joints, damaged coatings and areas beneath accumulated mud.

Large plates can also be difficult to lift for inspection of the support structure below.

Painted carbon-steel checker plate often requires periodic cleaning, rust removal, surface preparation, primer application, topcoat renewal and edge repair.

Crocodile mouth corrosion options

Crocodile mouth plate can be manufactured from carbon steel, pre-galvanized steel, hot-dip galvanized steel, 304 stainless steel, 316L stainless steel and aluminum.

Hot-dip galvanizing protects carbon steel through barrier protection, cathodic protection and the development of a zinc patina. Performance still varies according to the environment and coating condition. See the American Galvanizers Association and its corrosion-protection guide.

Metallic-coated steel sheet may also be specified according to standards such as ASTM A924/A924M, together with the correct product specification and coating designation.

AMPP provides technical resources covering corrosion identification, monitoring, coatings and protection methods. See the AMPP corrosion reference library.

7. Cleaning and Maintenance

Checker plate cleaning

Because checker plate is solid, all contamination must be removed from the upper surface.

Typical cleaning may involve sweeping, scraping, pressure washing, degreasing, vacuuming, manual removal of mud, pumping standing water and cleaning around welded joints.

The cleaning process can temporarily increase slip risk if water and detergent remain on the plate.

HSE recommends selecting a cleaning method suited to both the flooring and the contamination. See HSE cleaning guidance and HSE wet-floor guidance.

Crocodile mouth plate cleaning

Open holes allow part of the contamination to pass through the walking level.

This may reduce surface cleaning effort, but material can accumulate beneath the walkway, around supporting beams, inside drainage channels, around fasteners, between adjacent planks and against toe boards.

Routine inspection should include both the top and underside of the walkway.

Maintenance teams should check for blocked openings, bent teeth, loose clips, missing bolts, coating damage, corroded supports, deformed channels, debris beneath the plank, sharp damaged edges and unauthorized field modifications.

The plate should not be promoted as maintenance-free or completely self-cleaning. It can reduce surface accumulation, but it still requires a maintenance program.

8. Installation and Fabrication

Checker plate fabrication

Checker plate is familiar to most steel-fabrication workshops. It can be cut, welded, drilled, bent, bolted, framed and reinforced.

This makes it convenient for simple custom work.

Large solid panels, however, can be difficult to align or remove. Welding can also distort the plate and damage protective coatings.

Crocodile mouth plank installation

Crocodile mouth planks are commonly supplied in modular widths and lengths.

They may include pre-punched mounting holes, formed side channels, end plates, stair-tread side plates, toe boards, custom clips, numbered modules and removable access sections.

Typical fastening methods include bolts, J-bolts, saddle clips, hold-down clips, welded brackets and custom clamps.

The raised teeth must face upward, while the structural channels must be positioned according to the approved drawing.

Incorrect orientation may reduce traction, drainage and structural performance.

Where the product is classified as industrial cold-formed flooring, the project team may consult BS 4592-0 together with the relevant product-specific part. Solid metal plates are separately addressed by BS 4592-5.

9. Comparison of Application Environments

Dry indoor passage

Checker plate may be suitable where the environment remains dry, traffic is light, drainage is unnecessary, corrosion exposure is controlled, the route is temporary, initial cost is the main concern and cleaning is simple.

A crocodile mouth plate may still be used, but its advantages may not justify the additional forming and installation cost in a basic dry passage.

Outdoor walkway

Crocodile mouth plate is generally more practical where rain is frequent, snow or ice may occur, mud can enter the walkway, water must leave the walking level, panels require routine removal and weight reduction is important.

Oily industrial workshop

An open serrated plate may offer stronger contaminated-condition traction and drainage.

However, oil must still be controlled at the source. Flooring cannot replace leak repair, drip trays, oil collection, cleaning procedures, suitable footwear and inspection.

Inclined access route

Ramps and inclined platforms create greater slipping consequences.

A more aggressive serrated surface may be appropriate, but designers must also evaluate slope, handrails, crossfall, drainage, load, footwear, traffic direction and environmental exposure.

Public or high-frequency pedestrian route

Aggressive crocodile mouth teeth may be less comfortable for some public-access applications.

A rounded-button product such as Perf-O-Grip may provide a better balance between pedestrian comfort and drainage.

For this alternative, see our Perf-O-Grip perforated safety-grating guide.

10. Representative Case: Replacing Checker Plate in an Outdoor Factory

The following is a representative project scenario based on common industrial renovation requirements. It is not presented as a verified result from a named customer.

The original condition

A manufacturing company used painted checker plate on an elevated outdoor walkway connecting a production building with a maintenance platform.

The walkway had been installed because checker plate was inexpensive and could be welded quickly to the existing frame.

Over time, the customer reported several problems: rainwater remained in low areas, oil from nearby equipment mixed with dust, the embossed pattern became polished along the main route, paint failed around welds and cut edges, rust developed beneath accumulated mud, large panels were difficult to remove, the supporting steel could not be inspected easily, cleaning water flowed toward the stair landing and several sections required repeated coating repairs.

The customer initially planned to weld additional bars onto the checker plate.

That proposal could create more texture, but it would also increase weight, add new welds, damage the coating, create additional cleaning edges and leave the solid drainage problem unchanged.

Information collected before redesign

The supplier requested total walkway length, clear walkway width, support spacing, existing beam sizes, maximum pedestrian load, tool and equipment load, site photographs, oil exposure, rainfall conditions, required material life, existing corrosion condition, fastening preference, need for removable panels and destination standards.

The proposed system

The replacement design used hot-dip galvanized crocodile mouth planks.

The proposed configuration included raised serrated openings, open drainage area, formed side channels, shorter modular panel lengths, pre-punched bolt holes, removable maintenance sections, additional support at joints, galvanized-compatible fasteners, edge protection, numbered installation drawings and drainage clearance beneath the walkway.

The thickness and channel depth were selected according to the actual support span and intended load.

The operational difference

After replacement, rainwater could pass through the walking surface instead of collecting on top.

Loose dust and small debris were less likely to remain across the full walkway width. The modular planks were also easier to remove when maintenance personnel needed access to the steel frame.

The raised teeth provided more pronounced footwear contact than the worn checker pattern.

The facility still maintained routine inspections, oil-leak control, debris removal, fastener checks, galvanized-coating inspections, drainage cleaning, lighting checks and footwear requirements.

The project was successful because it combined a different walking surface with improved drainage, fastening, access and maintenance procedures.

11. Complete Performance Comparison

12. Lifecycle Cost Comparison

Initial purchase price is only one component of walkway cost.

Initial material cost

Checker plate usually has a lower starting price because it requires less specialized forming.

Crocodile mouth plate may cost more due to CNC punching, specialized tooling, forming, channel bending, custom fasteners, surface treatment and engineering data.

Supporting-steel cost

A lighter open plank may reduce dead-load demand, but this benefit must be calculated for the actual structure.

Installation cost

Modular planks may reduce crane time, manual handling, on-site cutting, welding, coating repair and installation disruption.

Cleaning cost

Checker plate may require more frequent removal of standing water, oil and mud from the walking surface.

Crocodile mouth plate may reduce surface accumulation but still requires underside and drainage cleaning.

Corrosion-maintenance cost

Painted checker plate may require repeated surface preparation and recoating.

Galvanized or stainless crocodile mouth plate may reduce coating maintenance in appropriate environments, but the material choice must match the corrosion conditions.

Replacement cost

Large checker plates can require extensive lifting and cutting.

Modular planks can allow damaged areas to be replaced individually.

Production downtime

A walkway that requires frequent closure for cleaning, coating or replacement can create indirect operating cost.

Lifecycle cost should therefore be calculated over the intended service period rather than estimated from material price alone.

13. Selection Rules

Select checker plate when:

The passage is indoors and normally dry; drainage through the floor is not required; traffic is light or moderate; the route is temporary; the support structure can carry the weight; the surface can be cleaned easily; initial cost is the primary concern; and aggressive serrations are undesirable.

Evaluate crocodile mouth plate when:

Rainwater reaches the walkway; oil, mud or sludge is present; through-drainage is required; the walkway is inclined; workers carry tools or equipment; lower panel weight is valuable; modular removal is required; cleaning access is important; the project has a long service-life target; or the environment has a high consequence of slipping.

The word must should only be used when required by a project specification, regulation or qualified engineering assessment.

No product shape can independently guarantee safety.

14. Information Required Before Ordering

Provide the project location, indoor or outdoor use, contaminant type, material grade, required surface treatment, plank width, plank length, channel depth, sheet thickness, open-area requirement, support spacing, maximum intended load, concentrated load, pedestrian or equipment traffic, ramp or stair angle, fastening method, required mounting holes, toe-board requirements, corrosion exposure, applicable standards, test-report requirements, packaging requirements, destination port, installation drawings and required quantity.

A quotation based only on square meters cannot adequately address structural, corrosion and installation requirements.

Conclusion

Traditional checker plate remains a useful product. It is economical, widely available and easy to fabricate. In dry indoor passages, temporary platforms and low-risk access areas, it may remain the most practical choice.

Its limitations become more significant when the environment contains rainwater, oil, mud, sludge or frequent washdown.

Because the plate is solid, contamination remains on the walking surface, drainage depends on slope and external drains, large panels add dead load, cleaning may require more labor, coating damage can create corrosion points and worn surface patterns are difficult to restore.

Crocodile mouth anti-skid plate provides a different performance profile.

Its raised serrated openings combine three-dimensional traction, through-drainage, lower material weight, formed structural channels, modular installation and multiple corrosion-resistant material options.

It is particularly valuable for wet outdoor walkways, oily workshops, wastewater platforms, industrial stairs, inclined access routes and other areas where contamination cannot be eliminated completely.

The correct choice is not automatically the cheapest, thickest or most aggressive plate.

A responsible industrial walkway decision should consider contamination, drainage, structural load, support spacing, corrosion, walking comfort, maintenance access, installation, service life and lifecycle cost.

Checker plate and crocodile mouth plate should therefore be selected for different operating conditions rather than treated as interchangeable products.

Talk to Us About Your Industrial Walkway

Is your current checker plate holding water, becoming polished, corroding around welds or requiring repeated repainting?

Send us the walkway dimensions, support spacing, site photographs, material preference, expected load, contamination type, required quantity and destination country. We can help compare checker plate, Perf-O-Grip and crocodile mouth safety grating for your project.

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Which issue is costing your facility the most: standing water, worn traction, structural weight, corrosion or cleaning labor? Send us a site photo and support spacing, and we will help you compare suitable walkway systems.

Article Tags

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