The labels 13×3, 26×3 and 40×3 do not tell you enough until you confirm which dimension comes first and whether the 3-inch measurement is internal or external. By checking the roll’s finished length, diameter and required clearance, you can select a tube that fits without crushing the contents or paying to ship unnecessary empty space.
Key takeaways
- Treat 13×3, 26×3 and 40×3 as length × internal diameter.
- Measure the rolled item’s length and outside diameter before ordering.
- Choose a tube longer than the item and wider than its tightest roll.
- Confirm internal dimensions, wall thickness, caps, quantity and delivery terms.
What do 13×3, 26×3 and 40×3 mean?
A notation such as 13×3 usually means length × diameter: 13 inches long and 3 inches in diameter. For the comparison below, the first figure is nominal internal length and the 3-inch figure is internal diameter.
| Size | Nominal internal length | Internal diameter | Internal circumference | Cylindrical capacity before end plugs |
|---|---|---|---|---|
| 13×3 | 13 inches | 3 inches | Approximately 9.42 inches | About 1.50 litres |
| 26×3 | 26 inches | 3 inches | Approximately 9.42 inches | About 3.01 litres |
| 40×3 | 40 inches | 3 inches | Approximately 9.42 inches | About 4.63 litres |
These are cardboard tubes different sizes, but the capacities are theoretical cylinders. End plugs, recessed closures or rolled lips reduce the usable clear length, so a 13-inch catalogue length is not automatically 13 inches of packing space.
The names alone do not confirm internal diameter (ID), outside diameter (OD), wall thickness or clear usable length. “3-inch tube” is incomplete: a tube with a 3-inch OD has less room than one with a 3-inch ID because its wall occupies space inside that outside measurement.
Before ordering, request both ID and OD, plus wall thickness and clear internal length. This prevents comparisons between round cardboard tube sizes that use different conventions. Check the cardboard tube sizes available against the supplier’s written measurements, not only the catalogue label.
How to measure a rolled item before choosing a tube
Measure the finished roll in three dimensions before choosing a tube: its edge-to-edge length, its maximum outside diameter after securing it, and the tube’s clear internal length between closures. Use this cardboard tube size guide for cardboard tube sizes for shipping, not the loose sheet dimensions.
| Measurement | How to take it | Why it matters |
|---|---|---|
| Finished roll length | Measure edge to edge along the roll axis | The roll must fit between the tube’s end closures |
| Maximum roll diameter | Secure the roll, then measure its widest outside point | This is the tube-bore clearance you must provide |
| Clear internal length | Measure the usable space between installed plugs, caps or rolled lips | Cut length can exceed the actual packing space |
Paper width is not roll diameter. Sheet length, paper thickness, number of sheets and rolling tightness determine the finished diameter. Treat any cardboard tubes size guide based only on paper format as incomplete.
Measure the largest production roll, not a relaxed or loose sample. Add enough radial clearance for easy insertion without crushing edges, but keep movement small so the contents do not telescope or strike the ends.
A trial pack confirms the fit; run one especially for curled prints, fabric, thick certificates or multiple sheets, because their edges and spring-back can change the packed diameter.
Check the tube’s actual internal diameter against the roll’s maximum diameter, not its outside diameter. Ask for the clear internal length between closures before ordering.
Which tube fits documents, posters and long drawings?
Match the tube’s clear length to the roll’s finished length, not to the sheet’s name. These cardboard tube sizes for shipping work as follows:
| Tube | Best matches | Fit condition |
|---|---|---|
| 13×3 | Short certificates, compact calendars, small artwork and document rolls | Finished roll length is below the tube’s clear internal length |
| 26×3 | Medium posters, A3 or A2 work, charts and many rolled prints | Use when the rolled item needs more length than 13 inches |
| 40×3 | Long architectural drawings, A1 or A0 sheets, large posters, artwork and fabric rolls | Use when the roll length requires the additional clear length |
A4, A3, A2, A1 and A0 sheets can be rolled in different directions. The selected tube depends on which sheet dimension runs along the tube, the resulting finished roll length and the roll’s outside diameter; paper size alone does not calculate the fit.
Check the actual clear measurements before ordering round cardboard tubes sizes in Bangalore. A 3-inch bore can still be too narrow for a tightly rolled, thick or multi-sheet item, while a longer tube is useless if the roll exceeds its usable length.
Choose a rectangular box for flat presentation, a triangular mailer for anti-roll handling, or a wider tube when the roll is too large for a 3-inch bore. Use rigid packaging for rigid contents; a round tube alone will not prevent breakage.
What should you confirm before buying tubes in Bangalore?
Turn the nominal choice into a written purchase specification. A cardboard tube size guide in Bangalore is useful only when every supplier defines the dimensions the same way. State the contents, mass, delivery location, quantity and whether the tube is for retail presentation or transport protection.
1. Send these measurements and construction requirements:
| Field | Ask the supplier to state |
|---|---|
| ID and OD | Internal and external diameter, with tolerance for each |
| Length | Clear internal length between closures, plus tolerance |
| Wall | Wall thickness, tolerance and winding construction: spiral or convolute |
| Paper | Grade, kraft ply strength and adhesive specification |
| Closure | End-cap type, fit and retention or pull-out performance |
| Protection | Axial crush or compression test method and acceptance value |
| Conditions | Moisture storage limits, conditioning environment and exposure risk |
A nominal listing does not prove that cardboard tube sizes available from different suppliers have matching bores, walls or usable lengths. Send the same specification to every supplier; Packbox.In can provide one Bangalore contact for comparable samples or a quotation.
2. Treat 40×3 as a structural choice, not merely a longer 13×3. Its long, narrow body bends and buckles more easily, so heavy contents or palletised transport may require a thicker wall, stronger kraft plies, reinforced end protection, internal blocking or a secondary carton.
3. State storage conditions, including protection from rain, wet floors and condensation. High humidity softens paper and reduces compression resistance, which can loosen end closures. Include the contents’ mass so the supplier can match performance to the load.
How to compare cardboard tube sizes and prices
A 26-inch tube is not automatically twice the price of a 13-inch tube. At the same diameter and construction, its cylindrical paper area is roughly double, while a 40-inch tube needs about 3.08 times as much.
| Length | Paper area versus 13-inch tube | Cost implication |
|---|---|---|
| 13 inches | 1.00 times | More of the price comes from fixed work |
| 26 inches | About 2.00 times | Material rises, but setup and closures do not double |
| 40 inches | About 3.08 times | Long-pack handling and protection can add more |
Cutting, winding setup, closures, minimum-order quantities, packing and delivery alter the final ratio. Use this cardboard tubes size guide to compare cardboard tube sizes and prices, not catalogue labels alone.
Compare cardboard tube sizes and prices in Bangalore only after fixing the ID or OD, clear length, wall build, paper grade, closures, finish, order quantity, packing, GST and freight. A 40-inch tube can attract dimensional-weight, length or length-plus-girth charges, then need anti-roll bundling or an outer carton.
Before accepting a quotation, check:
- ID or OD, clear length and wall specification
- Paper grade, closures and finish
- Order quantity, packing, GST and freight
- Packed dimensions and per-piece price
- Delivered price, lead time and delivery location
- Sample approval and replacement terms
A low unit price means little if the tube is shorter, thinner or costlier to deliver. Ensure every supplier quotes the same specification.
Frequently asked questions
What do 13×3, 26×3 and 40×3 mean for cardboard tubes?
The notation means nominal internal length × internal diameter: 13, 26 or 40 inches long, each with a 3-inch internal diameter.
How do I measure a rolled item before choosing a cardboard tube?
Measure the rolled item’s length and outside diameter after rolling it firmly without crushing it. Choose a tube longer than the item and wider than the roll.
Which cardboard tube size fits documents, posters and long drawings?
Use 13×3 for shorter documents, 26×3 for standard posters and medium-length drawings, and 40×3 for long drawings or oversized sheets when the 3-inch diameter suits the roll.
What should I confirm before buying cardboard tubes in Bangalore?
Confirm whether listed dimensions are internal or external, plus wall thickness, end caps, quantity, stock, delivery location, transport charges and GST-inclusive pricing.
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