M20*57 Excavator Track Shoe Bolts and Nuts: Specifications and Fitment Guide

M20*57 identifies a track shoe bolt with a nominal thread diameter of 20 mm and a stated length of 57 mm, paired with a compatible nut. That description is a useful starting point, but it does not by itself confirm fitment: thread pitch, bolt-head and shank dimensions, shoe thickness, chain link design, and the machine’s parts specification also matter. We recommend matching the complete assembly against the machine or undercarriage manufacturer’s requirements before ordering. This guide explains what to verify and what information to send a supplier for a dependable quotation.

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Key Takeaways

• M20 refers to a nominal metric thread diameter of 20 mm; 57 mm is the stated bolt length, but confirm how the supplier measures that length.
• Do not assume thread pitch, bolt grade, coating, or nut type from the M20*57 size description alone.
• Check the bolt and nut as an assembly against the track shoe, track link, and machine application.
• Share drawings, part numbers, photos, required quantity, and destination when requesting a quote.

Who This Guide Is For

This guide is for parts distributors, equipment dealers, maintenance teams, and procurement professionals sourcing excavator track shoe bolts and nuts. It is especially useful when replacing fasteners by measurement or when comparing offers from more than one supplier. If you are purchasing for multiple machine models, treat each application as a separate fitment check rather than assuming one M20*57 assembly suits every machine.

Understanding M20*57 Track Shoe Bolts and Nuts

What the size designation tells you

In metric fastener terminology, “M20” indicates a nominal thread diameter of 20 mm. The “57” generally identifies a stated bolt length of 57 mm, but the measurement reference can vary with the fastener design, so ask the supplier to confirm whether it is measured from beneath the head or by another convention. The designation does not specify the bolt’s full geometry or performance properties.

Thread pitch is a separate specification. For reference, the standard coarse pitch associated with an ISO metric M20 thread is 2.5 mm, but a particular track shoe application may require a different pitch or a specific thread form. Confirm the pitch from the original part, drawing, or equipment documentation rather than ordering on the diameter alone.

What the assembly does

Track shoe bolts and nuts secure the shoe to the track link, helping maintain the assembled undercarriage connection during operation. The fastener must suit the mating holes and the equipment’s specified clamping requirements. A mismatch in dimensions, thread, or seating surfaces can prevent correct installation or compromise the connection, so visual similarity is not enough to establish compatibility.

Specifications and Material Options to Verify

For sourcing purposes, treat M20*57 as one part of the specification, not the complete specification. Request details for the bolt, nut, and any supplied washer or other component as a set. The information below helps buyers compare offers without relying on assumptions about an unverified product.

Material, grade, and coating

Fasteners may be offered in different material grades, strength classes, and surface finishes, but the right choice depends on the machine specification and operating conditions. A darker or brighter finish is not proof of a particular grade, and a coating should not be treated as a substitute for correct mechanical properties. We advise buyers to provide the required specification or request written confirmation of the offered material and finish.

How to Check Fitment Before Ordering

Step 1: Identify the machine and undercarriage

Record the machine make, model, serial number range where available, and track shoe or track link part number. An undercarriage may have variations across model years or configurations, so use the exact machine information available to your team. If the fastener is being replaced during maintenance, preserve the removed parts for comparison when safe and practical.

Step 2: Compare the complete fastener geometry

Measure the existing bolt and nut, and compare the results with the drawing or supplier specification. Check the nominal diameter, stated length, thread pitch, head profile, shank details, nut height, and seating arrangement. Use measuring tools appropriate to the feature, and record dimensions in millimetres to avoid conversion errors.

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Step 3: Confirm the application requirement

Check the equipment documentation or approved parts information for the specified fastener grade, tightening method, and any special installation instruction. We cannot determine a safe tightening torque from “M20*57” alone, because the required value depends on the fastener specification, joint design, and equipment guidance. Follow the machine or component manufacturer’s instructions rather than using a generic torque value.

Step 4: Confirm quantity and supply scope

State whether you need bolts only or complete bolt-and-nut sets, and clarify whether washers are included. Provide the number of track shoes or assemblies to be serviced, plus any planned spare quantity. This prevents a quotation from being based on a different packing or component scope than your purchasing team expects.

Buyer Selection Framework

Common sourcing mistakes

• Ordering by “M20*57” alone without confirming pitch, length convention, and head geometry.
• Assuming a fastener fits because its external dimensions appear similar to the removed part.
• Choosing a grade or coating based only on price or appearance.
• Leaving bolt-and-nut set contents, packaging, or inspection documentation undefined.
• Applying a generic torque value without checking the equipment instruction.

Pricing, MOQ, and lead time

Quoted pricing can depend on specification, material and finish requirements, order quantity, packaging, and delivery destination. Minimum order quantity and lead time are supplier- and order-specific, so we recommend requesting these details in writing rather than relying on a general estimate. For repeat purchasing, ask whether the quotation identifies the exact specification and whether the same configuration can be referenced in future orders.

Supplier evaluation checklist

Before placing an order, confirm that the supplier can clearly identify the offered bolt and nut configuration and explain any differences from your requested specification. Ask for a drawing or dimensional confirmation where fitment is uncertain, and verify the quoted quantity, packing, delivery terms, and available product documentation. A supplier should be able to distinguish confirmed product details from items that still require your machine information or approval.

Working with Zhonghai Jiuchuan

At Zhonghai Jiuchuan, we support B2B buyers seeking excavator undercarriage fasteners, including M20*57 track shoe bolts and nuts. To help us assess a request, share the machine model, track shoe or fastener part number, required quantity, destination, and any drawing or photos available. We can use those details to clarify the specification and quotation scope before you make a purchasing decision.

If your application has a defined thread pitch, grade, coating, or packaging requirement, include it in the inquiry. If some details are unknown, tell us what was measured and what remains unconfirmed; this helps avoid treating an assumption as a specification. Final fitment should be verified against the equipment or component requirements before installation.

Conclusion: Confirm the Full Specification, Not Just the Size

M20*57 indicates a 20 mm nominal thread diameter and a stated 57 mm length, but those dimensions alone cannot guarantee that a track shoe bolt and nut will fit a particular excavator. Confirm the thread pitch, length measurement convention, head and shank geometry, nut configuration, and required mechanical properties against the machine documentation or original part. These checks give buyers a clearer basis for comparing suppliers and reducing avoidable ordering errors.

For your next step, gather the machine and part identification details, record the full fastener dimensions, and request written confirmation of the bolt-and-nut specification, quantity, MOQ, and lead time. Contact Zhonghai Jiuchuan with that information to discuss your M20*57 excavator track shoe bolt and nut requirements.

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