Efficient material usage
Powder is pressed to shape rather than cut away. Callo lists “poor use of material” as the trade-off of cutting machining — sintering is the answer to it.
Bearings · Filters · Structural parts · SMC
Precision components.
Built from powder.
Swedish manufacturing of high-quality sintered components for demanding industrial applications. From standard bearings to custom structural parts — Callo combines powder metallurgy expertise with a published focus on short lead times.
Standard programmeD4043-03
- Type
- Plain, self-lubricating
- Material
- Bronze Sint A51 (10% Sn, 1,2 C and rest Cu)
- Impregnation
- Turbine oil ISO VG 68
- Tolerances
- Bore E7 · Outer r7
Swedish manufacturing
Nässjö, Sweden
ISO 9001
Certified since 2004
ISO 14001
Certified since 2011
Short lead times
Callo’s stated focus
01Who we are
A Swedish powder metallurgy partner — not just a parts supplier.
Callo Sintermetall AB is a major supplier of sintered bearings, filters, structural parts and magnets. We offer both standard “off the shelf” products as well as customized components made to customer specifications. Our strength lies in providing high-quality products with very quick deliveries. Our production facilities are situated in the southern region of Sweden.
Callo is family owned and manufactures structural parts, soft magnetic materials, bushings and filters from metal powder. The focus is on short lead times and on staying at the technical front of PM — including a powder press and a pusher furnace the company designed and built itself.
- Standard bearing articles
- 292
- Bore range, mm
- ⌀2–100
- Filter powder grades
- 8
- ISO 9001 certified since
- 2004
194 plain · 92 flanged · 6 billets
Standard programme, off the shelf or to order
CA200 to CA5 — 200 µm down to 5 µm
ISO 14001 certified since 2011
02What we make
Four product areas. One process.
01
Bearings
Self-lubricating sintered bearings for reliable, maintenance-free operation.
Learn more02
Filters
Durable porous metal filtration and pneumatic silencing.
Learn more03
Structural parts
Complex components produced net-shape, without machining away the material.
Learn more04
Soft magnetic composites
Components for efficient, compact electromagnetic designs.
Learn more05
Custom components
Turn a drawing or an engineering requirement into serial production. Send a print or a 3D model and Callo comes back with questions, a route and a price.
03The chain
From a drawing to serial production.
Powder metallurgy is not a single operation — it is a chain, and decisions taken at the start decide what is possible at the end. Callo works across the whole of it, which is why the company describes itself as a supplier and solver of problems rather than a parts vendor.
- 01
Idea or drawing
A print, a 3D model, or a part that already exists and needs to be made better or cheaper. The earlier this arrives, the more Callo can influence.
- 02
Material & design
Density target, material characteristics, geometry and function are fixed together. Density drives strength, hardness, elasticity and impact resistance.
- 03
Tooling
Die, punches and core rods are designed around the pressing direction. Complex contours cost nothing extra on the part — only on the tool.
- 04
Compaction
Metal powder is pressed to net shape. Callo runs a powder press built in-house for multi-level structural parts.
- 05
Sintering
The green part is sintered so the particles bond. Callo built its own pusher furnace into the production line.
- 06
Finishing
Repressing, cutting-machining, roll polishing, oil impregnation — whatever the tolerance class and function require.
- 07
Quality control
Inspection against the drawing inside an ISO 9001 quality system, certified since 2004.
- 08
Serial production
Repeat production with short lead times — Callo’s stated focus alongside staying at the technical front of PM.
04The method
Why powder metallurgy?
Sintering sits between die-cast zinc and forged steel in material terms — and beats both on material usage and on the cost of complexity. Where it wins, it wins clearly. Where it does not, Callo will say so.
Repeatable production
The tool defines the part. Once the die is right, part number ten thousand is the same as part number ten.
Complex geometries
Transverse grooves and channels, odd contours and integrated features come out of the tool — contour costs tooling, not part price.
Reduced machining
Net shape out of the furnace. Finishing is applied where the tolerance class genuinely needs it, not everywhere.
Integrated functions
Self-lubrication, filtration, magnetic flux paths and mechanical structure can live in one pressed component.
Volume economics
Low or modest tooling cost to start, and a fast per-part process — the cost curve improves as the volume grows.
05Standard programme
292 bearings you can specify today.
Callo’s standard bearing programme runs from a ⌀2 mm bore to a ⌀100 mm bore, in plain and flanged forms, plus billets. Search it by article number or filter it by the dimensions you actually have to hit.
Bearing catalogue194 plain · 92 flanged
| Article | ⌀ inner | ⌀ outer | Length | Type |
|---|---|---|---|---|
| D4024-03 | 15 | 20 | 20 | Plain |
| D4041-02 | 25 | 30 | 25 | Plain |
| D4052-03 | 40 | 50 | 50 | Plain |
| D4523-02 | 20 | 26 | 20 | Flanged |
| D4534-02 | 50 | 60 | 50 | Flanged |
Dimensions in mm. Availability is confirmed per enquiry — no live stock figures are shown.
06Custom components
Have a component in mind?
Send Callo your drawing or your requirements and start a technical discussion. The earlier the conversation starts, the more there is to gain — geometry, material, tooling and production economics are still open.
- 01
Send what you have
Share the available part information directly with Callo and confirm the preferred drawing or model format.
- 02
Talk to someone technical
Callo publishes direct phone and email contacts for questions and orders.
- 03
Get a real answer
Discuss feasibility, materials and tooling requirements with Callo before production.
Demo page only — file formats and delivery workflow require Callo approval
06Engineering support
Designed for sintering.
The earlier Callo becomes involved in the design process, the easier it is to optimise geometry, material properties, tooling and production economics. A part drawn for machining and then handed to a sinter shop is a part that costs more than it needs to.
- Geometry
- Levels cost extra and limit density. Contour does not cost extra on the part — only on the tool.
- Density
- Strength, hardness, elasticity, impact resistance and permeability all follow density. High density limits complexity.
- Material properties
- From just above die-cast zinc to almost as good as forged, depending on what the part has to survive.
- Tolerances
- IT 9 after sintering, IT 13 in the direction of pressing — improvable by repressing, machining and roll polishing.
- Tooling
- Die, punches and core rods follow the pressing direction. Avoid sections thinner than 1.5 mm.
- Production volume
- Low start-up cost and a fast per-part process — the economics improve as the series grows.
07Quality
Quality built into the process.
Certification is not paperwork bolted on at the end — it is how the press, the furnace and the inspection bench are run. Callo has held ISO 9001 since 2004 and ISO 14001 since 2011.
Since 2004
ISO 9001
Quality management
Providing guidelines to ensure products and services consistently meet customer and regulatory requirements.
Certificate available on request
Since 2011
ISO 14001
Environmental management
Providing a framework for us to enhance our environmental performance and comply with regulations.
Certificate available on request
08Manufacturing
Made in Sweden.
Built for industry.
Callo’s production sits in Nässjö, in the southern region of Sweden. Being small and Swedish is the point: flexible production, a stated focus on short lead times and technical development in powder metallurgy.
Two of the machines on the line — a powder press for multi-level structural parts and a pusher furnace — were designed and built by Callo itself.
Poppelgatan 15, 571 39 Nässjö
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