Types of excavator attachments
Modern excavators are designed to accept a wide range of interchangeable attachments through the dipper arm. The right attachment can transform a single machine from an earthmover to a demolition tool, material handler, or landscaping platform. Here are the main categories.
Buckets
Buckets are the most common excavator attachment. They come in several forms designed for different soil types and tasks:
- Digging buckets: General-purpose excavation in soil and soft rock. Fitted with replaceable teeth.
- Grading (ditch cleaning) buckets: Flat-edged, no teeth — used for profiling, levelling, and clearing drainage channels.
- Riddle (skeleton) buckets: Open-tine design to sieve soil and separate rocks or roots from fill material.
- Ditching buckets: Wide, curved profile for forming and cleaning drainage ditches to a consistent profile.
- Rock buckets: Heavier-duty construction with reinforced base and sides for hard material and demolition debris.
See our full excavator bucket guide for detailed advice on sizing, tooth types, and when to refurbish.
Quick couplers and pin grabbers
A quick hitch (also called a quick coupler) is fitted between the dipper arm and the attachment. Rather than repinning manually each time you change tools, the quick hitch provides a secure mechanical or hydraulic connection that can be changed in minutes.
Quick hitches come in three broad types:
- Dedicated (system-specific): Works only with attachments designed for that pin geometry. Safelock is the market-leading UK dedicated system.
- Mechanical: Grabs the attachment's existing pins. Pro-Lok offers double-locking security for contractors.
- Hydraulic: Cab-controlled attachment changes. Uni-Lok suits machines with existing auxiliary hydraulics.
For a full breakdown, read our quick hitch buying guide.
Specialist couplers
For landscaping, utility work, and complex excavation, specialist couplers add axes of movement that a standard arm cannot achieve:
- Tilting hitch: Tilts the attachment laterally — typically up to 90° each side — for grading on slopes and profiling.
- Rotating hitch: Provides continuous 360° rotation for tasks such as pipe laying, sorting, and demolition.
Other common attachments
- Hydraulic breakers — for breaking concrete, rock, and hard foundations
- Hydraulic grabs — for handling loose material, scrap, and waste
- Compaction plates — for compacting backfill and sub-base material
- Augers — for drilling post holes and foundation piles
- Rippers — single-shank tools for breaking up compacted ground
Matching attachments to machine size
Every excavator attachment — from buckets to quick hitches — must be rated to match your machine's operating weight. Using an undersized attachment creates a structural safety risk. Using an oversized one can affect machine stability and void your warranty.
The two key parameters are:
- 1Machine operating weightThe total weight of the excavator with operator, fuel, and standard bucket. This is the figure used to select the correct quick hitch and attachment size class.
- 2Dipper pin centresThe distance between the two pins at the end of the dipper arm. This determines mechanical compatibility. Buckets and quick hitches must match these dimensions exactly.
| Machine Class | Operating Weight | Typical Applications |
|---|---|---|
| Mini excavator | Under 3 tonnes | Landscaping, drainage, confined sites |
| Compact excavator | 3 – 6 tonnes | Utilities, trenching, civil works |
| Small excavator | 6 – 10 tonnes | General construction, groundworks |
| Medium excavator | 10 – 18 tonnes | Road building, bulk excavation |
| Large excavator | 18 – 30 tonnes | Quarrying, major civil, demolition |
Not sure if an attachment is compatible with your machine? Use our compatibility checker.
Safety compliance in the UK
Working with excavator attachments in the UK is subject to several overlapping frameworks. Understanding which apply to you is essential for contractors, plant hire businesses, and principal contractors responsible for a site.
Quick hitch safety
The HSE has issued specific guidance on quick hitches following incidents involving the unintended release of attachments. Key requirements include:
- A secondary retention device independent of the primary locking mechanism
- A visual indication system so the operator can confirm the lock is engaged
- A documented inspection and maintenance regime
- Operator training specific to the quick hitch model fitted
PUWER and LOLER
The Provision and Use of Work Equipment Regulations (PUWER) require that all work equipment — including excavator attachments — is fit for purpose, maintained in safe working order, and used only by trained operators.
Where excavators are used for lifting operations (including with grabs or when manoeuvring materials), the Lifting Operations and Lifting Equipment Regulations (LOLER) may also apply, requiring thorough examination by a competent person at specified intervals.
EN474-1
EN474-1 is the European standard for earth-moving machinery. It sets out design and testing requirements for quick-release attachment systems. Products manufactured to this standard have been tested to withstand operational forces without accidental disengagement. Harford Attachments designs its products in compliance with these requirements.