Concrete spacer block moulds and rebar cover spacer moulds are used to produce the small concrete, plastic or mortar elements that maintain the correct concrete cover between rebar and formwork. They are used in slabs, beams, columns, walls, foundations and precast elements. For overseas buyers, the right choice depends on cover thickness, application and whether the project uses horizontal slab, vertical rebar or pile-cap spacers.
Zhihua supplies concrete spacer block moulds, rebar cover moulds, saddle spacers, bar strip spacers, plum-blossom covers, round disc covers, slot inserts, concrete test specimen moulds and ballast block moulds for standard catalogue products and OEM profiles from drawings or sample photos.
1. Confirm the application type first
Different markets call similar products by different names: spacer block, rebar cover, saddle spacer, bar strip, plum-blossom cover, round disc cover or concrete chair. Before asking for a quote, decide which structural element the spacer will support.
- Spacer block moulds (square / conical / sloped / U-shaped): used for general cover, foundation work and precast concrete elements.
- Saddle spacers: used in slab-on-grade, raft foundations and mesh support to keep rebar at the right height.
- Bar strip spacers: long, narrow supports for rebar runs in narrow sections or strip footings.
- Plum-blossom rebar covers: round covers with a notched centre for vertical rebar in columns, walls and beams.
- Round disc covers: round covers for vertical rebar in columns, walls and pile caps.
- Slot insert spacers: for rebar with specific cross-section or pipe-insert requirements.
2. Specify cover thickness and finished dimensions
For spacer block moulds, the key parameters are the concrete cover thickness, the finished spacer dimensions and the 1-out-N count of the mould. Cover thickness is usually driven by local structural codes (for example 20mm, 25mm, 30mm, 50mm or higher for marine or foundation work).
If only a sample is available, provide clear photos from the front, side and top. Adding a ruler or known-size reference helps the factory judge the dimensions more accurately.
3. Choose 1-out-N count that fits your production
Many Zhihua spacer moulds are available in 1-out-N variants such as 1-out-1, 1-out-8, 1-out-16, 1-out-25 or 1-out-100. A higher 1-out-N count speeds up casting for high-volume orders but increases mould size and weight. For distributors and project orders, 1-out-1 or 1-out-16 is usually a good balance between output and handling.
4. Match spacers to concrete type and finish
Spacer moulds are usually used to cast concrete spacers, but the same mould geometry can also be used for mortar or plastic-aggregate spacers. For visible concrete (architectural finish), choose a spacer type that leaves the smallest possible shadow line.
- Saddle spacers: small shadow, easy to cover with concrete.
- Plum-blossom covers: round shape with a small footprint on column/wall rebar.
- Round disc covers: similar to plum-blossom but with a flat top and simpler geometry.
- Bar strip spacers: ideal for strip footings and narrow sections.
5. Include concrete test specimens in the same project
Most rebar projects also require concrete test specimens for cube, cylinder or tensile strength tests. The concrete spacer block moulds catalogue from Zhihua includes 33Γ6Γ1.3cm tensile test specimen moulds, 19Γ4Γ1.5cm compression specimen moulds, U-shaped no-fines moulds and triangular no-fines block moulds. Combining spacer moulds and test specimen moulds in one shipment is common.
6. Pair with ballast block moulds for solar / pile cap work
For solar farms, pile cap foundations or large foundation blocks, ballast block moulds are often ordered together with standard spacer moulds. The current Zhihua catalogue includes Γ36Γ11cm 22kg round ballast block moulds that pair well with rebar cover spacers in foundation and renewable-energy projects.
7. What to send for a fast quote
- Application type: spacer block, saddle, bar strip, plum-blossom, round disc, slot insert, test specimen or ballast block.
- Cover thickness, finished spacer dimensions and 1-out-N count.
- Profile drawing, local standard or clear sample photos.
- Order quantity, destination country and whether mixed profile types are needed.
8. Avoid vague quote requests
Quotes based only on "spacer mould" without cover thickness, finished dimensions or 1-out-N count usually lead to confusion and wrong samples. A short list of the application, the cover thickness and the finished spacer size gives Zhihua enough to quote a standard catalogue item or review an OEM profile.
9. Related moulds
- Drainage channel moulds — water-management and channel-line infrastructure.
- Paver block moulds — for surface finishing around spacer / rebar cover work.
- Kerbstone moulds — for road edges and slab boundaries.
For OEM spacer block moulds, send a drawing, sample photo or local standard. Zhihua can review feasibility, suggest a mould structure and quote standard catalogue or custom production.