Undercarriage Hardware and Fasteners: Bolt Grades, Stretch and Flange Types
Browse bolt and nut product information.
The fasteners and small parts on an undercarriage are where the cheapest savings turn into the most expensive failures. A bolt grade chosen to save a few dollars can cost a machine a day. This page covers the hardware specification. It sits beneath the machine index at undercarriage parts by machine.
Bolt grades and heat treatment
When to move up to grade 14.9 and how heat treatment differs between 8.8 and 12.9 are the specification; premium hardware against OEM grades and the cost of failure are the argument.
Stretch, locking and reuse
Bolt stretch and what happens to a nut's locking ability after one use explain why fasteners are consumables; grade 12.9 nuts and thread stripping and preventing thread seizure in quarries cover the specific cases, with field serviceability for the compact machines.
Master links and joining hardware
Master links under job-site tension and split master links for compact machines cover the joining parts, and forging the forming method behind them.
Flange types and fit
Replacing single flanges with double for soft-soil stability, selecting flange types for forestry and whether the AT10 pulley standard matters for fit cover the parts that decide how the chain is guided.
FAQs
Can undercarriage bolts be reused?
Once a bolt has been taken to torque it has stretched, and a stretched bolt has less clamp left. Reuse is false economy.
Is a higher grade always better?
To a point. Higher grades need matched nuts and correct torque; a grade 12.9 bolt with a soft nut simply strips the nut.
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