Block Clamp Attachment

Description

Block Clamp Attachment

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A forklift block clamp is a specialized hydraulic attachment designed to handle palletless loads of concrete blocks, bricks, and stone slabs.
Unlike standard forks, block clamps use lateral pressure to grip the load securely.
The specifications below represent industry standards for attachments compatible with 1.5-tonne to 10-tonne forklifts.

Key Performance Specifications

When reviewing a specification sheet, these are the primary metrics that determine if the attachment fits your application:
Parameter Description Typical Range.

Rated Capacity The maximum weight the clamp can safely handle at a specific load center. 1,500 kg – 8,000 kg.
Opening Range The distance between the arms (minimum to maximum). 300 mm – 2,000 mm.

Arm Length The depth of the clamping surface (must match your stack depth). 1,000 mm – 1,400 mm.
Arm Height The vertical surface area of the clamp pad. 200 mm – 600 mm.

Mounting Class The ISO/ITA carriage class of the forklift (must match). Class II, III, or IV.
Lost Load Center The thickness of the attachment that pushes the load forward. 150 mm – 250 mm.

Physical & Technical Attributes

Beyond the basic dimensions, the construction of the clamp affects its longevity and safety.
Frame Construction: High-strength steel profiles (often T-beam or sliding arm designs) to ensure stability under high clamping pressure.
Sideshift Function: Most modern block clamps include an independent sideshift (typically $\pm100$ mm) to allow precise placement without moving the forklift.
Clamping Pads: Often equipped with vulcanized rubber or polyurethane surfaces to prevent chipping or breaking the blocks.
Bearings: High-performance units use UHMW (Ultra-High Molecular Weight) polyethylene bearings which are self-lubricating and reduce maintenance.

Hydraulic Requirements

To operate a block clamp, your forklift must be equipped with specific hydraulic capabilities:
Hydraulic Functions: Usually requires two auxiliary functions (one for clamping/opening and one for sideshifting).

Pressure Relief Valve: Essential for protecting the load; it allows the operator to adjust the clamping force so the blocks are held securely but not crushed.
Operating Pressure: Typically ranges from 120 to 160 bar, depending on the manufacturer.

Critical Safety: Residual Capacity

It is a common mistake to assume a 3-tonne forklift can still lift 3 tonnes once a block clamp is attached. You must calculate the Residual Capacity because:
The attachment itself is heavy (often 400 kg – 1,000 kg).
The attachment moves the center of gravity of the load further forward (Effective Thickness).

Note: Always check the Load Capacity Plate on your forklift. OSHA and international standards require a new data plate to be issued whenever an attachment like a block clamp is installed.
Would you like me to help you calculate the estimated residual capacity for a specific forklift model and block weight?