Used Flatbed Semi-Trailers — Sourced to Order, Shipped CIF Worldwide

What Is a Flatbed Semi-Trailer?

A flatbed semi-trailer — also called a platform trailer or 18 wheeler flatbed trailer — is a load-carrying unit with no sides and no roof. The deck sits at a fixed height, typically 1,350–1,500 mm from the ground, giving crane and forklift operators unrestricted access from any angle. The front end carries a kingpin that locks into the fifth wheel of a tractor head; the rear carries two or three axle groups with air or mechanical suspension.

Because the deck is open, a flatbed handles cargo that cannot be enclosed in a box or curtain trailer: long steel sections, bundled pipes, rolled sheet metal, excavators, generators, pre-cast concrete panels, and 20 ft or 40 ft ISO containers secured with twist-locks. For African and Middle Eastern operators running mixed loads on variable roads, the flatbed is the most versatile general-purpose trailer in a fleet.

Types of Flatbed Trailer — Which One Do You Need?

Choosing the right trailer configuration before you enquire saves time during sourcing. The four main types sourced through Sigma are:

The tri-axle flatbed truck configuration (3-axle semi-trailer + 6×4 tractor) is the most requested for African long-haul because it spreads the gross weight across more wheels — important on roads with strict axle-load limits and on unpaved routes.

Key Specifications at a Glance

All specifications are indicative; exact details depend on the unit sourced. Sigma confirms full specs — including axle rating, deck material, and landing gear brand — before issuing a proforma invoice.

How the Trailer Pairs with a Tractor Head

A semi-trailer cannot move under its own power. It couples to a tractor truck (prime mover) via a fifth wheel mounted on the tractor's chassis. Sigma stocks 6×4 tractor heads — primarily HOWO and SHACMAN — that are pre-inspected and ready to ship alongside a sourced flatbed trailer.

Buying the tractor and trailer together through one exporter has three practical advantages:

• Compatibility confirmed: Fifth-wheel height, kingpin size, and air-line connectors are matched before the units leave China.
• Single CIF shipment: Both units load on the same vessel, reducing freight cost and clearing complexity at the destination port.
• Paperwork aligned: One set of export documents (B/L, packing list, inspection certificate) covers the combination, simplifying customs clearance in Kenya, Nigeria, South Africa, UAE, and Iraq.

If you already own tractor heads, Sigma can source a trailer only — but we will ask for your tractor's fifth-wheel height and kingpin specification so the trailer deck height and coupling geometry are correct.

Pre-Purchase Inspection Checklist

Used flatbed semi-trailers vary widely in condition. Whether you are buying a second hand flatbed truck configuration locally or importing from China, these are the points Sigma's team checks — and the points you should ask any supplier to document:

• Chassis main beams: Look for cracks at the crossmember welds, especially near the rear bogie and at the kingpin plate mounting area. Repairs are acceptable only if properly welded and shot-blasted, not just painted over.
• Kingpin: Check for wear (a worn kingpin causes fifth-wheel slop and trailer sway). Measure kingpin diameter — standard is 50.8 mm (2 in); replace if worn below 49.5 mm.
• Suspension: On mechanical leaf-spring units, look for cracked or missing leaves and worn U-bolts. On air-suspension units, check air bags for cracks and test levelling valves.
• Axles and hubs: Spin each hub by hand to feel for bearing roughness. Check Fuwa or BPW axle beam straightness visually and with a tape measure across the axle ends.
• Brakes: Test slack adjusters and brake shoes. Check that all brake chambers are the correct size and that the dual-line air system holds pressure for at least 10 minutes with the engine off.
• Deck and stanchion pockets: On a dropside trailer, check that stanchion sockets are not cracked or bent. Check the timber or steel deck planks for rot, cracking, or loose bolts.
• Tyres: Minimum 4 mm tread on all positions. Check for sidewall bulging, cracking, or uneven wear that signals alignment or overloading history.
• Lights and wiring: Rear marker lights, brake lights, and indicator lights must work on the 7-pin connector that matches your tractor's socket.

Sourcing, Shipping, and Import Process

Sigma does not carry a standing stock of flatbed semi-trailers. Instead, we source trailers to order from a network of verified suppliers and workshops across China, inspect the unit, and ship it CIF to your destination port. Here is the typical timeline:

• Enquiry to proforma invoice: 2–5 working days. We need your target payload, trailer length, suspension type preference, and destination port.
• Sourcing and pre-shipment inspection: 2–4 weeks. We locate a matching unit, inspect chassis, axles, brakes, and tyres, and send you a photo/video report for approval.
• Payment and export: We accept T/T. Export documents include commercial invoice, packing list, bill of lading, and a pre-shipment inspection certificate.
• Transit: 18–28 days to East African ports (Mombasa, Dar es Salaam), 22–35 days to West Africa (Lagos, Tema), and 12–18 days to the Gulf (Jebel Ali, Umm Qasr).

For buyers importing a flatbed trailer for 18 wheeler combinations into countries with strict axle-load enforcement (Kenya, South Africa, UAE), Sigma can provide the axle group weights separately on the packing list to assist with port clearance and road-permit applications.

Explore our full range of semi trailer trucks or browse tractor trucks if you are building a complete fleet from scratch.