PULTRUDED STRUCTURAL PROFILES
GRP Box Section Sizes
A practical route for selecting stocked square GRP box section sizes for posts, frames and fabricated project parts.
Search by outside size, then verify the duty
This page uses the correct trade term, box section, for square hollow GRP profiles. Outside dimension and wall thickness control fit, but structural suitability still depends on length, restraint, loading and connections.
Use the main GRP box section page for the full product overview, then send a schedule where repeated cuts, holes or CNC-prepared parts are needed.
How to compare box section
Outside dimension
Sets the overall frame geometry and compatibility with plates, clamps and fittings.
Wall thickness
Influences weight, local connection behaviour and available section properties.
Cut and preparation route
Separates full lengths, straight cuts and drawing-led CNC parts for efficient quotation.
Specify the section, direction and support
Pultruded GRP is directionally reinforced. Geometry, fibre direction, span, restraint, connection and service environment must be considered together when the profile carries load.
- Call the profile box section, not square tube
- List outside size before wall thickness
- Keep each finished length as a separate line item
- Show hole patterns and datum faces
- Verify structural use with product-specific data
Information needed for selection and quotation
| Input | What to confirm | Why it matters |
|---|---|---|
| Section | Square outside dimension, wall thickness and available stock length | Defines geometry, fit and available material data. |
| Length and quantity | Stock lengths, finished cuts, tolerance and piece count | Controls cutting yield, labelling and packing. |
| Structural duty | Span, supports, loads, deflection and restraint | Allows the designer to verify section suitability. |
| Preparation | Square cuts, mitres, holes, slots, notches or complex CNC shapes | Separates simple cutting from fabrication-ready preparation. |
| Environment | Moisture, chemicals, salt, UV, temperature, fire and electrical requirements | Influences resin, surface veil, colour and fixings. |
Cut, drill and CNC preparation
Supply can be arranged as full stock lengths, simple cut lengths or a drawing-led preparation package. CNC cutting is useful for repeated holes, slots, notches and complex shapes where controlled geometry and part identification reduce site work.
Send dimensioned drawings in a usable format and identify tolerances, datum faces, hole sizes, edge distances and whether cut edges require sealing or finishing.
Installation principles
- Support and restrain profiles as shown by the project design
- Use compatible corrosion-resistant fixings and backing details
- Avoid uncontrolled holes, notches and sharp internal corners
- Control GRP dust during cutting and drilling
- Check completed dimensions before installation
Final structural verification and connection design remain the responsibility of the project designer.
Frequently asked questions
Can grp box section sizes be supplied cut to length?
Yes. Provide finished lengths, quantities, tolerances and a clear part reference. For holes, notches or complex geometry, include dimensioned drawings.
Can I use steel section sizes as a direct GRP substitute?
No. GRP has different stiffness, strength, connection and directional behaviour. The chosen section must be checked using product-specific data and the actual support and load case.
What should be shown on a cutting drawing?
Show the section, datum, overall length, angles, holes, slots, notches, tolerances, quantity, part mark and any edge-finish requirement.
Send the section schedule once
Combine section sizes, cut lengths, preparation, quantities and delivery requirements in one schedule. We can help route stocked material, cutting and technical questions efficiently.
Continue your profile order
Compare the family, calculate stock lengths, plan connections or send a finished cutting schedule.
Available to buy or quote
Buy GRP square tubes or request cut-to-length support
Choose stocked square tube options online, or send lengths and quantities for a project quote.
For frames, rails and supports, confirm span, fixing centres, load exposure and environment before ordering.
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GRP Box Sections
Price range: £103.85 through £289.98 inc VAT Price range: £86.54 through £241.65 ex VAT Select options This product has multiple variants. The options may be chosen on the product pageAvailable configurations 3 purchasable options
PR-BX-51-51-06-GY
GRP Box Sections – 50.8 x 50.8 mm, 6 mm, 6 m, Grey
- Profile Size
- 50.8 x 50.8 mm
- Wall Thickness
- 6 mm
- Length
- 6 m
- Colour
- Grey
600 × 5.08 × 5.08 cm 12.6 kg£103.85 inc VAT£86.54 ex VAT Choose this option
PR-BX-51-51-06-YE
GRP Box Sections – 50.8 x 50.8 mm, 6 mm, 6 m, Yellow
- Profile Size
- 50.8 x 50.8 mm
- Wall Thickness
- 6 mm
- Length
- 6 m
- Colour
- Yellow
600 × 5.08 × 5.08 cm 12.60 kg£103.85 inc VAT£86.54 ex VAT Choose this option
PR-BX-76-76-06-GY
GRP Box Sections – 76 x 76 mm, 6.35 mm, 6 m, Grey
- Profile Size
- 76 x 76 mm
- Wall Thickness
- 6.35 mm
- Length
- 6 m
- Colour
- Grey
600 × 7.6 × 7.6 cm 21.10 kg£289.98 inc VAT£241.65 ex VAT Choose this option
GRP square tube and box section sizes
This page supports dimension-led searches for GRP square tube sizes, fibreglass square tube, GRP hollow section sizes and GRP box section dimensions. Use the live product options to confirm current outside dimensions, wall thicknesses and available lengths rather than relying on a generic size table.
For rectangular as well as square profiles see GRP box sections.