pultrx | Fiberglass square tube Product: https://pultrx.com/frp-profiles/fiberglass-square-tube Updated: 2026-10-22 Contact: inquiry@pultrx.com A fiberglass square tube is a closed glass fiber reinforced polymer profile with equal nominal outside sides. Its flat faces provide drawing references for brackets and drilled connections, while its hollow interior requires separate attention to corner radii and insert clearance. FRP, GRP and glass fibre square tube refer to this same product form. Product family: https://pultrx.com/frp-profiles/fiberglass-tubes Manufacturer: Henan Zhongsheng Composite Material Co., Ltd. Export partner: pultrx, Shanghai, China Catalogue figures are references, not a binding offer. Confirm the configuration, inclusions and acceptance criteria in the written quotation. TBD means not confirmed, never zero. CONFIGURATIONS Configuration SPECIFICATIONS Catalogue outside envelope: Configuration = 25 × 25 to 100 × 100 mm Catalogue wall and length: Configuration = Wall 3–6 mm; length 1,000–6,000 mm (Published ranges, not a list of available combinations or stock.) Corner radii and dimensional tolerances: Configuration = TBD — ask factory Mechanical properties and applicable tests: Configuration = TBD — ask factory Minimum order and lead time: Configuration = TBD — ask factory SOURCE Henan Zhongsheng — square tube catalogue: https://www.frpzs.com/FRP-Profiles/Fiberglass-Tube/Fiberglass-square-tube.html Manufacturer catalogue reviewed 2026-10-22. Metric ranges describe published examples; confirm the exact section, material and availability in writing. SELECTION - Do not infer the insert shape: Outside side minus two walls gives a nominal flat-to-flat opening, but does not describe the internal corners. Supply the insert corner geometry and required insertion depth. - Name each drilled face: Use face labels and one length datum. A square outline can hide an incorrectly rotated hole pattern; show whether opposite holes must align and how the part will be installed. - Confirm the actual section: Catalogue limits do not guarantee every side, wall and length combination. Request the proposed drawing and tooling confirmation before treating a size as available. Inspect the corners as well as the sides | Feature | What the purchase drawing should control | | --- | --- | | Equal outside sides | Label both measurements and agreed tolerances; do not accept one side measurement as the whole check. | | Internal corners | Define radius or a mating gauge that represents the actual insert. | | Face alignment | Specify squareness and twist requirements with an agreed inspection setup. | | Holes and slots | Identify the face, end datum and relationship between opposing features. | Keep the source dimensions in millimeters. A nominal metric section is not automatically interchangeable with an inch-sized sleeve. A fit sample should represent the production material, surface condition and machining revision. Dimensional approval also leaves structural performance to a separate review of the loading, connections and proposed material data. TECHNICAL REFERENCES - Henan Zhongsheng square tube catalogue: https://www.frpzs.com/FRP-Profiles/Fiberglass-Tube/Fiberglass-square-tube.html — Supports metric exterior, wall and length ranges; certification and performance claims are not adopted. External references explain selection principles; they do not qualify the offered product or transfer another manufacturer's ratings. PRODUCT FORMS AND CATALOGUE EXAMPLES - Square hollow section with equal nominal exterior sides APPLICATIONS TO REVIEW - Framework components subject to project design - Bracket and railing assemblies with specified connections PROCESS TO REVIEW - Issue the face-labelled drawing: Provide side, wall, radii, hole references and cut-length quantities. - Confirm tooling and material: Resolve the proposed section and any departures from the enquiry. - Approve the assembled sample: Check insert clearance and bracket alignment using nominated mating parts. - Review lot inspection: Reconcile dimensions, hole pattern and labels before dispatch. CORE SCOPE TO SPECIFY - Square tubes to the agreed section drawing and cut-length schedule - Order-specific packing, lot identification and agreed inspection records OPTIONS AND SERVICES TO PRICE SEPARATELY - Face drilling, slots, inserts and sample qualification - Special tooling, project tests and freight RFQ INPUTS — complete these before requesting a quotation - Outside side, wall and corner requirements - Face-labelled hole pattern with datum end - Insert dimensions and assembly sample requirements - Service loads, exposure and required test evidence - Quantities by length, packaging and delivery destination ACCEPTANCE EVIDENCE TO AGREE - Measure both sides and walls at nominated positions. - Check corner clearance using the approved insert or gauge. - Inspect squareness, twist and face-specific machining. - Verify cut lengths, surface condition and lot records. COMMERCIAL ITEMS TO CONFIRM Applicable performance and destination requirements; lead time in working days; payment milestones; warranty party, term and exclusions; packing, Incoterm and delivery destination. For equipment, include plant power and spare parts. QUESTIONS Are all catalogue size combinations available? No availability is established by these ranges. Obtain an offer identifying the complete section, quantity and production lead time. Does the square shape establish a load capacity? No. A load assessment needs the material properties, span, supports and connections for the particular assembly. Same-size steel performance cannot be transferred to fiberglass. RELATED RESOURCES Compare all fiberglass tube forms: https://pultrx.com/frp-profiles/fiberglass-tubes Compare fiberglass round tube: https://pultrx.com/frp-profiles/fiberglass-round-tube Compare fiberglass rectangular tube: https://pultrx.com/frp-profiles/fiberglass-rectangular-tube Prepare a finished-profile RFQ: https://pultrx.com/guides/frp-profile-rfq-checklist Review the manufacturer and plan a factory audit: https://pultrx.com/manufacturing-partner Prepare an enquiry: https://pultrx.com/contact?interest=frp-profile&product=Fiberglass%20square%20tube