Bolt-On vs Clip-On Rubber Track Pads: Start With the Steel Shoe Interface
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Bolt-on and clip-on rubber track pads are not interchangeable labels for the same part. Each one needs a specific interface on your existing steel shoes. Bolt-on pads need holes that match the pad's stud or bolt layout. Side-mounted or clip-on pads need a shoe profile, edge and clamp space that match the maker's drawing. A matching nominal width does not settle either question. You can specify a pad only when the interface evidence on your shoes agrees with the supplier's exact drawing.
What each name physically attaches to
A bolt-on pad is bonded to a plate with studs or bolts. Those fasteners pass through holes in the steel shoe. One US supplier describes its bolt-on pads as normally used where the existing grouser shoes are pre-drilled. Another describes threaded studs at the back of the pad, bolted through pre-drilled holes in the shoe. Both describe a hole-to-fastener relationship. So the hole pattern, the hole condition and the pad's fastener layout must agree.
A side-mount or clip-on pad is held from the shoe's sides or ends by brackets, clamps or mounts. That is why shoe profile and edge clearance matter more here than a hole pattern. Product designs differ. One supplier says side-mount pads are made for triple-grouser shoes with or without pre-drilled holes. Another describes a clip-on pad held by a bolt-on bracket at each end. Both are vendor descriptions of their own products. Neither shows that every clip-on pad fits every shoe.
Chain-mounted pads are a separate system. They bolt to the chain links rather than the shoe, so they belong to a different decision from the one here.
Why identical width does not settle fitment
A "450 mm" pad names a nominal width. It does not give the hole spacing, grouser layout, shoe section, edge geometry or clamp position. Two shoes of the same width can have different hole patterns or no holes at all. Two clip-on pads of the same width can use different bracket designs. Suppliers also use "clip-on," "side-mount" and "clamp-on" loosely. One supplier says side-mount pads are often wrongly called clip-on. Treat each term as a request to see the maker's drawing, not as a design category.
The same caution applies to "tool-free." Some clip-on designs use bolted brackets, so the pad may still need a wrench, nut and bolt access. Do not assume a clip-on pad skips fasteners or torque steps. The maker's installation instructions decide that.
Build the steel-shoe interface evidence sheet
The sheet turns "which type?" into a list of facts the supplier can confirm one by one. Which dimensions matter depends on the supplier's drawing. This article does not set generic measurement values. Suppliers often provide their own measurement forms, and these are specific to the shoe type. One US supplier, for example, offers separate guides for double-bar, triple-bar and chain-mount configurations. Use the form that matches your shoe.
| Evidence item | What it establishes | Bolt-on relevance | Side-mount / clip-on relevance | If missing or conflicting |
|---|---|---|---|---|
| Machine make, model, serial or PIN | Identifies the undercarriage build the shoes belong to | Needed to tie the hole pattern to a specific machine | Needed to tie the shoe form to a specific machine | Hold the quote. Shoes may have been replaced or may be aftermarket |
| Shoe identifier or marking, plus photos of the cross-section, top and ends | Shows grouser type and section shape | Confirms where holes sit relative to grousers | Shows the profile and edge the clamp must engage | Record "unknown shoe." Do not infer it from the machine brand |
| Nominal width and measured width | Separates the catalog size from the real fit | Confirms the pad plate sits between grousers | Confirms the pad body and clamp reach the edge | Report both numbers. Do not substitute one for the other |
| Hole pattern and hole condition | Shows whether studs or bolts can pass through | Core requirement. Note spacing, size, and whether holes are clear, worn or elongated | Photograph any holes anyway. Some designs use them and some do not | "No holes" does not rule out side-mount. It rules out a hole-dependent design |
| Edge and bracket clearance | Shows whether clamps or brackets can seat | Secondary | Core requirement. Note space beside the shoe, nearby links and any obstruction | Photograph both ends and sides. Hold the quote if clearance is unclear |
| Supplier drawing and revision | Defines what the pad actually requires | Compare the pad's stud or bolt layout with your holes | Compare the bracket design with your shoe | Request the drawing. Do not accept a catalog line alone |
| Written confirmation from the supplier | Records who confirmed fit and against what data | Should cite the same hole pattern | Should cite the same shoe form | Treat verbal "it fits" as unconfirmed |
Mark each row matched, missing or conflicting. A matched row means your data agrees with the supplier's drawing for that item. A missing row means neither side has the data yet. A conflicting row means the two disagree, for example a measured hole spacing that differs from the drawing. Resolve conflicts before ordering, and do not let a matched row on width cover for a missing row on holes or clamp space.
Using the sheet when holes exist and when they do not
If your shoes have holes, treat that as a reason to check bolt-on, not as proof it fits. The holes must agree with a particular pad's layout. Measure the pattern and compare it with the drawing. Side-mount may still be an option, but only if the maker's shoe-form and clearance requirements are also met.
If your shoes have no holes, you are not limited to a single answer. A hole-dependent bolt-on pad cannot attach as designed. A side-mounted pad may be possible if the maker confirms it for your shoe profile and clearance. Do not drill, weld or modify shoes to make a pad fit unless the shoe maker or machine manufacturer approves it. Changes to shoe material can affect structure and safety, and approval belongs with qualified service personnel.
Send the supplier the same sheet either way. Ask for a product-specific mounting drawing and written confirmation against your evidence. Installation procedure, fastener torque, reuse limits and lifting or support rules come from the pad maker and the machine's service documentation. They are separate from the specification step and are not covered here.
Handling a conflict between suppliers
Vendor descriptions of the same term can differ, and some claim longer service life for one design. Those claims come from product pages, apply to each maker's own products, and are not independent comparisons. Do not use them to rank bolt-on against clip-on. Fit comes first. If two suppliers cite different requirements for the same shoe, ask each for its drawing and compare the drawings with your sheet.
When your sheet is complete, check it row by row. If the shoes are worn or damaged enough to prevent a reliable measurement, see how track shoe and pad wear is assessed first. If you have not yet decided whether a steel shoe with pads suits your work, read rubber pads versus steel track shoes before starting the sheet.
Sending the package to a supplier
Once each row is marked matched, missing or conflicting, send the whole sheet to the supplier. KTSU's track shoe and rubber pad collection shows the public product categories. A collection page does not confirm that a given pad fits your machine. Ask for a product-specific mounting drawing and written fitment confirmation based on your machine details, photos, measurements and any hole data. A quote is ready to specify when the drawing and your shoe evidence agree on every row. Any row left missing or conflicting stays open until the supplier resolves it in writing.