Binding Spines Office Products A4 51mm (up to 510 sheets) 50 pcs, black

Plastic binding spines by office products in black, designed for A4 documents with a 51 mm diameter. Each spine is intended for use with comb binding machines to secure punched pages and form booklets, reports, manuals or presentations. The pack contains 50 pieces and is suitable for assembling documents that require binding for office, school or archival purposes.

Advantages

These binding spines provide a simple and repeatable method to bind large documents up to 510 sheets. Their 51 mm diameter accommodates thick stacks while maintaining an even alignment of pages. Made from flexible plastic, the spines allow the bound document to open flat and resist minor handling damage. The consistent size and shape ensure compatibility with standard comb binding machines and make bulk binding tasks efficient.

Suitable for

• Thick reports, manuals and reference documents
• Technical documentation and training materials
• Office and administrative packet assembly
• School projects and academic submissions
• Document archiving and long-term storage

Key specifications

• Format compatibility: A4 documents
• Spine diameter: 51 mm (suitable for up to approximately 510 sheets depending on paper weight)
• Material: flexible plastic
• Color: black
• Quantity in pack: 50 pieces
• Intended binding type: comb/spiral spine for comb binding machines

How to use

Punch the document pages with the appropriate comb-binding punch to create evenly spaced rectangular or round holes along the binding edge. Align the punched stack on the open comb spine mounted on a comb binding machine, then rotate or close the comb to engage all holes and secure the pages. After closing, verify that the spine teeth pass through each hole and that pages turn freely. For very thick stacks, split the document into sections, bind each section, then nest sections onto a single spine if needed.

Usage recommendations

Use paper weights consistently when estimating sheet capacity; typical capacity estimates assume standard 80 g/m² paper. Store spines flat in a dry environment to avoid deformation and check machine alignment regularly to prevent mispunching or uneven binding.