Last updated: 2026-09-05 · 5 min read
Mold Base Standards — What Are LKM, HASCO and DME Standards, How Do They Differ, and Which One Should You Specify for Your Injection Mold?
Mold base standards define the plate dimensions, guide pin positions, ejector layouts and component interfaces so that mold parts are interchangeable across suppliers. The three global standards: LKM (Chinese/Asian), HASCO (European) and DME (North American). Specifying the standard in the RFQ ensures the mold fits your press and uses components available from multiple suppliers.
- LKM (Lung Kee Metal) is the dominant standard in Asia — used by 70% of Chinese mold makers. LKM mold bases use metric dimensions (plate width: 150–1500mm), Chinese-standard guide pins (Ø16–Ø80mm) and metric ejector pin layouts. LKM components are available from Lung Kee and compatible suppliers across China, Southeast Asia and Japan. The LKM catalog defines 6 base types: DA (2-plate), DI (3-plate), DO (hot runner), DH (2-plate with hydraulic), and custom configurations. LKM plates are machined from C45 steel (equivalent to 1045 carbon steel).
- HASCO is the European standard — dominant in Germany, Switzerland, Italy and France. HASCO mold bases use metric dimensions but with different plate thicknesses and guide pin positions than LKM. HASCO guide bushings use a standardized press-fit bore (Ø25 × 30mm, Ø32 × 35mm, etc.) — any HASCO-compatible supplier can produce replacement components. HASCO components are available from Hasco (Germany), Meusburger (Austria) and Fibro (Germany). HASCO standard plates use C45 or 42CrMo4 steel (higher strength than C45).
- DME is the North American standard — dominant in the US and Canada. DME mold bases use imperial dimensions (plate width: 6–60 inches), imperial guide pins (Ø5/8″–Ø3″) and DME-standard ejector layouts. DME components are available from DME (now part of Proto Labs), PCS and Strack. DME plates use 1045 carbon steel or P20 pre-hardened steel. The DME catalog defines standard base sizes by width × length (e.g., 1010 = 10″ × 10″, 1515 = 15″ × 15″). DME is the standard for molds exported to North America — the press platen bolt pattern matches DME dimensions.
How Do LKM, HASCO and DME Standards Compare?
| Feature | LKM (Asia) | HASCO (Europe) | DME (North America) |
|---|---|---|---|
| Dimensions | Metric (mm) | Metric (mm) | Imperial (inches) |
| Plate steel | C45 (1045) | C45 or 42CrMo4 | 1045 or P20 |
| Guide pin Ø | 16–80mm | 20–80mm | 5/8″–3″ |
| Component availability | China, SE Asia, Japan | Germany, Italy, France | US, Canada |
| Price level | Lowest | Mid-range | Mid-range |
| Best for | Asian market molds | European market molds | North American market molds |
The standard you choose depends on where the mold will be maintained. If the mold runs in a US factory: specify DME — replacement components are available from US suppliers within 24 hours. If the mold runs in Germany: specify HASCO. If the mold runs in China or Southeast Asia: specify LKM. Mixing standards (e.g., LKM base with HASCO guide components) is possible but increases lead time and cost — non-standard components must be custom-machined.
Mold base — the standardized frame that holds the cavity and core inserts. It includes the A-plate (cavity), B-plate (core), support plates, ejector plate, guide pins and bushings. The mold base is purchased pre-machined to standard dimensions — only the cavity and core inserts are custom-machined for each part. The collapsible cores guide shows how special mechanisms fit within a standard mold base.
What Three Rules Guide Mold Base Selection in the RFQ?
- Specify the standard in the RFQ — do not leave it to the mold maker’s preference. If your factory uses HASCO components for maintenance, the mold must use HASCO standard plates, guide pins and ejector components. If the mold maker uses LKM but your factory stocks HASCO: a broken guide pin requires a custom order (2–4 weeks lead time) instead of a same-day replacement from your HASCO stock. Write the standard in the RFQ: “Mold base: HASCO standard, C45 steel, with HASCO guide bushings and ejector sleeves.” The unscrewing mechanisms guide shows how special mold mechanisms affect base selection.
- Match the mold base size to your press platen — the base must fit between the tie bars and align with the bolt holes. Check the press specification: platen size (width × length), tie bar spacing (distance between tie bars), and bolt hole pattern (M12, M16, M20). The mold base width must be smaller than the tie bar spacing — typically 50–100mm clearance on each side. The mold base bolt holes must align with the platen T-slot pattern. For a 500-tonne press with 1060mm tie bar spacing: maximum mold base width is 900mm.
- Specify plate thickness — thicker plates resist deflection under injection pressure but add weight and cost. Standard plate thickness: cavity plate 50–80mm, core plate 40–60mm, support plate 40–60mm. For high injection pressure (above 1000 bar): increase cavity plate to 80–100mm to prevent deflection. Deflection causes flash — at 1200 bar, a 50mm cavity plate deflects 0.05mm (enough to flash engineering resins). For thin-wall molding (1500+ bar): use 100mm cavity plates or add support pillars under the cavity.
Tie bar spacing — the distance between the four tie bars on an injection molding press. The mold base width must fit within the tie bar spacing — typically 50–100mm clearance on each side. For a 500-tonne press: tie bar spacing is typically 1060mm, so maximum mold base width is 900mm. The bolt hole pattern must also match the platen T-slot pattern. The thin-wall molding guide covers how high-pressure molding requires thicker plates and larger mold bases.
Mold base standards: LKM (Asia, metric), HASCO (Europe, metric), DME (N. America, imperial). Specify standard in RFQ — match your factory’s maintenance stock. Match base size to press platen. Plate thickness: 50–80mm standard, 100mm for high pressure.
- Standard specified in RFQ — LKM (Asia), HASCO (Europe), DME (N. America).
- Base size fits between tie bars — 50–100mm clearance on each side.
- Bolt holes match platen T-slot pattern — M12, M16, M20 depending on press.
- Cavity plate 50–80mm standard, 100mm for high pressure — thin plates deflect and flash.
- Maintenance stock matched to standard — broken guide pin = same-day replacement.
Frequently Asked Questions
Can I mix LKM and HASCO components in the same mold?
Yes — but each non-standard interface adds cost and lead time. A common combination: LKM base plates (cheaper, widely available) with HASCO guide bushings and ejector components (higher precision, longer life). The mold maker must machine the LKM plate bores to HASCO dimensions — this adds 1–2 days of machining. For production molds: using one standard throughout is preferred. For prototype molds: mixing standards is acceptable to reduce cost.
What is the cost difference between LKM, HASCO and DME mold bases?
For a standard 2-plate mold base (400mm × 500mm): LKM costs $2,000–$4,000, HASCO costs $4,000–$7,000, DME costs $3,500–$6,000. The price difference comes from steel quality (HASCO uses tighter tolerance plates), component precision (HASCO guide bushings have ±0.005mm tolerance vs. LKM ±0.01mm), and brand markup. For high-volume production molds (1M+ shots): HASCO or DME are preferred — the higher precision extends mold life. For prototype or low-volume molds: LKM is sufficient and saves 30–40% on base cost.
How do I specify a mold base in the RFQ?
Include: standard (LKM/HASCO/DME), base type (2-plate/3-plate/hot runner), plate dimensions (width × length × thickness for each plate), plate steel (C45/P20/H13), guide pin diameter and quantity, ejector layout (number and diameter of ejector pin holes), and any special requirements (hydraulic core pull, cooling circuit connections). Example: “LKM DA type, 400 × 500mm, cavity plate C45 60mm, core plate C45 50mm, 4× Ø32mm guide pins, 8× Ø6mm ejector pin holes.”
Key Takeaways
- 3 standards: LKM (Asia), HASCO (Europe), DME (N. America).
- Specify standard in RFQ — match your factory’s maintenance stock.
- Match base size to press platen and tie bar spacing.
- Plate thickness: 50–80mm standard, 100mm for high pressure.
Send the press specification (platen size, tie bar spacing, bolt pattern) and the mold drawing — the review specifies the mold base standard, plate dimensions and component selection needed to ensure the mold fits your press and uses maintainable components.
Sources: Plastics Technology — Mold Base Standards: LKM, HASCO and DME Compared · Plastics Technology Online — Mold Base Selection for Injection Molding · Lung Kee Metal (LKM) — Mold Base Catalog and Standards · HASCO — Standard Mold Base and Component Systems · DME (Proto Labs) — Mold Base and Mold Components
— Arthur, Tooling Engineer at aCatMould