Beschreibung
Every attachment on a mini excavator hangs from two pieces of steel. Bucket, hammer, grapple, ripper, thumb: they all pivot on the same pair of pins, and when one wears, the machine does not fail dramatically. It develops slop, the bucket loses its angle, the operator compensates, and the whole cycle gets slower and less accurate.
These pins are specified as class 10.9 steel, which is the number that matters. It indicates a tensile strength in the region of 1,040 megapascals, roughly twice that of the common commercial grade used in cheap replacement parts. A pin at that hardness resists deformation under load instead of mushrooming at the head, and it holds its diameter, which is what keeps the bushing from wearing oval. The dimensions are unambiguous: 24 mm diameter, 135 mm span, 35 mm thread, 170 mm overall length, supplied as a matched pair with nuts.
They are aftermarket replacement parts, and that is stated plainly rather than dressed up. What is not compromised is the specification, because a pin that fits but does not hold hardness is worse than no spare at all. Two pins in a box is the correct quantity: an attachment change takes both.
Downtime is rarely caused by the expensive component. It is caused by the two-dollar pin nobody replaced.
Why It Works
- ✦ Class 10.9 steel for high tensile strength under load
- ✦ 24 mm diameter with a 135 mm span and 35 mm thread
- ✦ 170 mm overall length, supplied as a matched pair
- ✦ Resists head deformation and bushing ovalization
- ✦ Fits buckets, hammers, grapples, rippers and thumbs
- ✦ Suits most mini excavator attachment interfaces
- ✦ Includes nuts for immediate installation
Technical Specifications
- Material: High-strength steel
- Bolt class: 10.9
- Diameter: 24 mm / 0.945 in
- Span: 135 mm / 5.31 in
- Thread length: 35 mm / 1.38 in
- Overall length: 170 mm / 6.69 in
- Finish: Silver, zinc plated
- Quantity: 2 pins with nuts
- Application: Mini excavator attachment pivot
- Type: Aftermarket replacement
Who It Is For
Plant hire yards keep a pair on the shelf because a worn pin takes a machine out of service for a day it did not need to lose. Owner-operators doing driveway and footing work replace them at the first sign of slop rather than at the point of failure. Agricultural contractors running a thumb or a hammer on a compact machine use the same interface, and the two-pin pack matches the fact that both sides of an attachment wear at the same rate.
Frequently Asked Questions
Q: What does bolt class 10.9 mean?
A: It denotes a high-strength steel with a nominal tensile strength near 1,040 MPa and a yield strength around 940 MPa, roughly double common commercial grades.
Q: Will these fit my mini excavator?
A: They fit attachments with a 24 mm pin bore and a 135 mm span between mounting ears. Measure the existing pin before ordering, since bore diameter varies across machines.
Q: Are both pins identical?
A: Yes. The set is a matched pair with nuts, since an attachment pivots on two points that wear together.
Q: Is this an OEM part?
A: No. These are aftermarket replacement pins, specified to the dimensions and hardness class listed rather than sold as manufacturer-branded parts.
Q: How do I know when a pin needs replacing?
A: Visible slop at the attachment, a hammered or mushroomed head, or a step worn into the shaft all indicate replacement. A pin that no longer holds the bucket angle is already past due.
Q: Do these come with nuts?
A: Yes, the set includes nuts. Two pins and their fasteners ship together.
Q: Can they be used with a hydraulic hammer?
A: Where the attachment interface matches 24 mm by 135 mm, yes. Hammer duty cycles are harder on pins, so inspection intervals should be shorter.
Q: Should I grease after installation?
A: Yes. Greasing the pin and bore on installation and at each service interval is what prevents the wear that led to replacement in the first place.
Q: What thread pitch does the nut use?
A: The thread runs 35 mm along the shaft in a standard coarse metric pitch matched to the supplied nut. Fit the nut that ships with the pin rather than reusing a worn one.
Q: Can these be machined to fit a different bore?
A: They are hardened steel at class 10.9, so machining removes the hardened surface layer and weakens the pin. Order the correct diameter instead.
Q: How often should pins be inspected?
A: At every attachment change and at each greasing interval. Any visible step, flat spot or head deformation means replacement before the next shift.
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