Quick answer: Sino East Steel manufactures and exports Adjustable Base Jacks for Scaffolding (Scaffolding) to Poland and the EU. Production follows EN 12811, EN 39, BS 1139 and every delivery includes an EN 10204 3.1 mill test certificate. Typical order: 10-20 tons, with 15-25 days transit from Tianjin to Polish ports. Contact us with your specification for a quotation within 24 hours.
Adjustable Base Jacks for Scaffolding
Adjustable Base Jacks — factory-direct products from Sino East Steel, one of China’s certified steel manufacturers serving Polish importers, distributors and contractors since 2005. Base jacks (screw jacks) are the primary levelling and load-distribution component of every scaffold system: a threaded spindle welded to a steel base plate, adjustable to compensate for uneven ground. We supply base jacks for ringlock, cuplock, kwikstage and frame systems, in hot-dip galvanized finish, with EN 10204 3.1 mill test certificates, and packed for sea freight to Gdansk, Gdynia, Szczecin and other Baltic and Northern European ports.
This page provides the full technical picture of our adjustable base jack range — sizes, load data, manufacturing background, quality assurance, packaging and ordering process — so your procurement team can evaluate the product without chasing data across multiple suppliers. For an exact quotation matching your required sizes and quantities, contact our export office; a confirmed price and delivery schedule are normally provided within 24 hours.
Key Specifications at a Glance
| Parameter | Value |
|---|---|
| Product | Adjustable base jack (screw jack) |
| Spindle Diameter | 32 / 38 mm threaded |
| Base Plate | 150 x 150 mm (other sizes available) |
| Adjustment Range | 300 / 500 / 600 mm |
| Surface | Hot-dip galvanized (HDG) |
| Certification | EN 10204 3.1 MTC |
| Minimum Order Quantity (MOQ) | 10-20 tons |
| Lead Time | 15-25 days |
| Payment Terms | T/T, L/C |
Available Types & Capacity
| Type | Specification | Notes |
|---|---|---|
| Ringlock base jack | spindle 32 / 38 mm, 300-600 mm | with rosette collar |
| Cuplock base jack | spindle 32 / 38 mm, 300-600 mm | with cup receiver |
| Kwikstage base jack | spindle 38 mm, 300-600 mm | with V-press plate |
| Frame base jack | spindle 32 / 38 mm, 300-500 mm | for frame standards |
| Plain base plate | 150 x 150 / 200 x 200 mm | non-adjustable |
Standards & Compliance
Base jacks are manufactured to EN 12811-1 (working scaffolds — performance requirements) with spindle load capacity verified by testing. Hot-dip galvanizing is performed to EN ISO 1461, and threads are rolled (not cut) for higher fatigue strength. The base plate distributes the standard load over the ground, preventing settlement and ensuring a level working platform.
Typical Applications
- Levelling ringlock, cuplock, kwikstage and frame systems on uneven ground
- Load distribution on soft ground, paving slabs and concrete
- Supporting vertical standards at the base of every scaffold bay
- Rental fleets — high-wear component with full size interchangeability
Quality Assurance & Testing
Manufacturing runs under an ISO 9001:2015 certified quality system. Spindle threads are gauge-checked and load-tested; weld integrity between spindle and base plate is verified before galvanizing. Every shipment includes an EN 10204 3.1 Mill Test Certificate, and third-party inspection by SGS, TUV, BV or Intertek can be arranged at the buyer’s request.
Packing & Delivery
Base jacks are bundled or boxed on pallets. Production takes 15-25 days, followed by sea freight to Gdańsk, Gdynia or Szczecin, with door-to-door (DDP) options available for container shipments.
How to Order
- Send your inquiry: system type, spindle size, adjustment range, quantities and destination port.
- Receive a quotation within 24 hours with current factory pricing and delivery schedule.
- Confirm the order: 30% T/T deposit, 70% before shipment, or L/C at sight.
- Production and optional third-party inspection (15-25 days).
- Shipment with full documentation: invoice, packing list, B/L, MTC, certificate of origin.
Frequently Asked Questions
What spindle sizes are available? Standard spindles are 32 mm and 38 mm with adjustment ranges of 300, 500 and 600 mm; other sizes can be produced on request.
Do you supply base jacks for all scaffold systems? Yes — ringlock, cuplock, kwikstage and frame system base jacks, matched to the standard geometry of each system.
Are the jacks galvanized? Yes, hot-dip galvanized to EN ISO 1461 for long service life in rental and outdoor use.
Adjustable Base Jacks — Specifications
| Parameter | Standard Range |
|---|---|
| Screw (spindle) | M30 x 500 / 600 mm (M36 on request) |
| Base plate | 150 x 150 mm, 8 mm thick (swivel option available) |
| Tube collar | 48.3 x 3.2 / 4.0 mm sleeve for standard / heavy-duty |
| Working load | 30–60 kN depending on spindle and collar grade |
| Adjustment | +/- 150–250 mm typical thread travel |
| Finish | Hot-dip galvanized to EN ISO 1461 |
Base jacks transfer the weight of the scaffold or shoring tower into the ground or slab and provide the fine height adjustment that levels the first lift. The spindle is cut from cold-drawn steel, rolled with a trapezoidal thread, and welded to a square base plate; the collar sleeve accepts the 48.3 mm standard tube. Swivel-base versions are available for sloping ground and load-spreading on soft surfaces.
Technical Features
- Precision thread — rolled trapezoidal thread gives smooth adjustment under load and resists wear across many erection cycles.
- For safety — the collar sleeve covers the thread entry, and a lock nut option prevents unintended rotation during use.
- Heavy-duty range — M36 spindles and 4.0 mm collars for shoring loads above 50 kN.
- Load spreading — 150 x 150 mm plates distribute load to avoid punching through timber sole plates or slab toppings.
Applications
Base jacks are used under every modular and frame scaffold, under shoring towers, and in formwork support systems where the first lift must be exactly level. Polish contractors use them daily on facade scaffolds and slab shoring; rental companies keep large stocks because jacks are the most frequently exchanged component on site.
Quality Assurance and Delivery
Spindles are verified for thread form and hardness; assemblies are load-tested per batch. Shipments include EN 10204 3.1 certificates. Packed in pallets or bulk bags, delivered to Polish and Baltic ports in 15–25 days; MOQ from 200 pieces.
Frequently Asked Questions
What is the difference between base jack and screw jack?
They are the same component — a threaded spindle with base plate. “Screw jack” usually refers to the heavy-duty shoring version with a larger plate and higher load class.
Do you supply swivel base jacks?
Yes, swivel-base versions for slopes and soft ground are available in the same spindle sizes.
What load can a standard M30 base jack carry?
Typically 30–40 kN working load; heavy-duty M36 versions reach 50–60 kN. Load tables are provided with the order.
Component Maintenance and Service Life
Hot-dip galvanized scaffolding components are designed for decades of service with minimal upkeep. After each project, clean components of mortar and concrete residue, stack them by type on timber battens, and store them off bare ground so the zinc layer is not damaged. Where the coating is scratched through to the steel, touch up with zinc-rich paint before the next erection cycle. Rotating stock evenly and keeping one spare set of wedges or blades per 1,000 components keeps a rental fleet productive for 15–20 years — the same discipline that Polish rental companies apply to their own fleets.
Load Classes and Configuration Notes
Scaffolding configurations are classified by load class according to EN 12811-1. Load class 3 (2.0 kN/m² distributed load) covers most facade renovation and finishing work; load class 4 (3.0 kN/m²) is used where materials are stacked on platforms; load classes 5–6 apply to heavy industrial and shoring duty. When you order a system, we confirm the load class with the bay layout, lift height and tie-in pattern, and provide the corresponding load tables. All systems can be configured as independent towers, facade scaffolds, birdcage supports or shoring structures simply by changing ledgers, transoms and ties — the same component pool covers all of them.
Why Buy Direct from Sino East Steel
Sino East Steel is a steel producer, not a trader: tubes for scaffolding components are rolled in our own mills, which gives us direct control over chemistry, wall thickness and surface quality, and keeps pricing at mill level. Since 2005 we have supplied Polish importers, distributors and contractors, and we maintain a bilingual (English / Polish) export team that prepares customs, certificates and shipping documentation from one source. Every order includes EN 10204 3.1 mill certificates, and for EU buyers we provide the technical file support needed for CE marking and EN 12811 compliance reviews.
Request a Quotation
To receive a factory-direct quotation, send your required component list (or facade area and working height), target port and quantity via the contact form, WhatsApp +86-186-2208-8833 or email [email protected]. Our export office responds within 24 hours with prices, load tables and a delivery schedule.
Component Lists for Complete Sets
When you order a complete system set, the quantity list is calculated from three inputs: the facade area to be covered, the working height, and the load class. For a typical 1.2 x 2.0 m bay at 2.0 m lift height, a rough rule of thumb is 2.0–2.5 m of standard per square metre of facade, 0.5 ledgers per square metre per lift, plus transoms, boards, base jacks and ties proportionally. We prepare the exact list from your drawings or measurements, so the set arrives balanced — enough standards to reach the top, enough ledgers for every lift, and the right number of boards, guard rails and toe boards for every platform level. Spare wedges, blades and pins are added at 1–2% of the component count, which is the practical allowance rental fleets use to cover loss and damage.
Erection and Dismantling Practices
Whichever system you choose, safe erection follows the same sequence: level the base with jacks, erect the first bay and fit ledgers and diagonals immediately, check plumb and level, then build lift by lift with guard rails and toe boards fitted before anyone works at the new level. Ties are installed at the spacing given in the load tables — typically every 4–6 m of horizontal length and every 2–3 lifts vertically, or closer where wind exposure is high. During dismantling, components should be lowered rather than thrown, and the scaffold should be inspected after any storm, impact or load change. Our documentation package includes an erection checklist that site teams can use directly.
Transport and Storage
Galvanized scaffolding components transport and store efficiently because they are stackable and do not require weather protection beyond basic precautions. For container loading, standards and ledgers are bundled by length with steel strapping and timber dunnage; boards and frames are palletized; small items (couplers, wedges, bolts) travel in bulk bags or cartons. On site, keep components on timber battens off the ground, sorted by type, and cover bundles if they will sit through winter weather. With this routine, a set retains full load capacity and appearance for 15–20 years of rental service — which is why galvanized systems remain the standard for professional fleets in Poland and across the EU.
Compliance and Documentation for EU Buyers
For buyers in Poland and the EU, we provide the technical documentation needed to satisfy CE marking requirements and EN 12811-1 conformity reviews: design basis and load tables for each system, material certificates (EN 10204 3.1) covering tube chemistry and mechanical properties, galvanizing certificates to EN ISO 1461, and weld inspection documentation. Where the scaffold is supplied as a complete system for sale to end users, the declaration of performance and technical file can be prepared from the same documentation set. Our export team is familiar with Polish customs procedures for steel products, including the documentation required for EU safeguard measures and import controls, and will prepare the shipping documents accordingly.
Working with Sino East Steel on Your First Order
Starting a relationship with a new supplier should be low-risk. On your first order we can agree a pre-production sample batch (for couplers, jacks or small components), arrange third-party inspection (SGS or similar) before shipment at your cost, and split a container shipment if you want to test the market with a smaller volume first. Payment by T/T with deposit and balance against shipping documents, or by irrevocable L/C, both work. After the first order, repeat orders benefit from fixed price windows of 30–90 days and reserved production slots, so your rental or construction schedule is not exposed to price swings.
Selection Support and After-Sales
Choosing between systems and sizing the set is easier with an engineer on the other end of the line. Our export team includes engineers who work daily with Polish and EU contractors, so we can recommend the system, calculate quantities, confirm load classes and review your tie-in pattern before production. After delivery, we support the first erection with remote guidance, provide spare parts and additional components from the same production batch codes, and can adjust a repeat order to match what your site actually consumed. You are not buying components from a catalogue — you are getting a configured system with engineering backup behind it.
