Connectors and sizes
JMB manufactures four connector lines. See where each one is used and check the available sizes below. If you cannot find yours, talk to sales.
Download full catalog (PDF)Square Anti-Crack
For timber in a range of sizes: beams, sawn blocks and squared pieces. Applied at the ends to help contain splitting.
- Shape
- Square and rectangular plates with dense teeth
- Material
- Galvanized steel
- Shipping
- Boxes, sacks or drums
- Application
- Timber in a range of sizes
- Size range
- 4 × 4 a 14 × 24 cmCheck the size with our sales team.
- Structural beams
- Sawn blocks
- Squared pieces
- Reforestation timber
- Spreads tension across the four corners of the end.
- Uniform grip on both dry and green timber.
- Available in sizes for different beam and block formats.
| Timber size | Recommended connector |
|---|---|
| 6 a 8 | Anti-racha 4 × 4 |
| 8 a 10 | Anti-racha 5 × 6 |
| 10 a 12 | Anti-racha 7 × 8 |
| 10 a 20 | Anti-racha 6 × 14 |
| 12 a 14 | Anti-racha 7 × 10 |
| 14 a 20 | Anti-racha 10 × 14 |
| 16 a 18 | Anti-racha 14 × 12 |
| 20 a 22 | Anti-racha 14 × 14 |
| 26 a 28 / 28 a 30 | Anti-racha 14 × 20 |
| 30 a 32 | Anti-racha 14 × 22 |
| 32 a 36 | Anti-racha 14 × 24 |
We also make the 3.3 × 4.0 anti-crack connector. Need a larger size? We make it on request.
Round Anti-Crack
For round logs in a range of sizes, from eucalyptus and pine to hardwoods. Helps contain cracking from the center of the end.
- Shape
- Round plate with dense teeth
- Material
- Galvanized steel
- Shipping
- Boxes, sacks or drums
- Application
- Timber in a range of sizes
- Size range
- Ø 65 a Ø 200 mmCheck the size with our sales team.
- Eucalyptus logs
- Pine logs
- Hardwoods
- Poles and posts
- The teeth follow the natural direction of the grain.
- Covers the center of the log, where the crack starts.
- Available in diameters of 65, 80 and 100 mm.
| Timber size | Recommended connector |
|---|---|
| Ø 8 a 10 | Anti-racha Ø 65 mm |
| Ø 10 a 12 | Anti-racha Ø 80 mm |
| Ø 12 a 14 | Anti-racha Ø 100 mm |
| Ø 16 a 18 | Anti-racha Ø 120 mm |
| Ø 18 a 22 | Anti-racha Ø 150 mm |
| Ø 28 a 30 | Anti-racha Ø 200 mm |
We also make sizes up to Ø 200 mm. Send us your log diameter to get the right recommendation.
Anti-Crack for Planks
Long strip for planks, solid tops and wide pieces. Spans the full width of the end.
- Shape
- Long strip with staggered teeth
- Material
- Galvanized steel
- Shipping
- Boxes, sacks or drums
- Application
- Wide pieces in a range of sizes
- Size range
- 1,8 × 10 a 2,5 × 28 cmCheck the size with our sales team.
- Solid planks
- Table tops
- Wide pieces for woodworking
- Timber for export
- Continuous length covers the full width of the piece.
- Staggered teeth help distribute stress points.
- The format follows the width of the plank without covering the entire end.
| Timber size | Recommended connector |
|---|---|
| 2,0 × 11/12 | Anti-racha 1,8 × 10 |
| 2,0 × 13/14 | Anti-racha 1,8 × 12 |
| 1,0 × 15/16 | Anti-racha 1,8 × 14 |
| 3,0 × 12/14 | Anti-racha 2,5 × 11 |
| 3,0 × 14/15 | Anti-racha 2,5 × 13 |
| 3,0 × 20/21/22 | Anti-racha 2,5 × 19 |
| 3,0 × 30/32 | Anti-racha 2,5 × 28 |
Size not in the table? We make it on request.
Anti-Crack for Sleepers
Helps reduce splitting and cracking in railroad sleepers and dense, large-section timber. It can also support the reuse of old sleepers.
- Shape
- Rectangular plate with dense teeth
- Material
- Galvanized steel
- Shipping
- Boxes, sacks or drums
- Application
- Sleepers in general
- Size range
- VariousCheck the size with our sales team.
- Railroad sleepers
- Dense, large-section timber
- Heavy framing
- Export loads
- Helps reduce splitting and cracking in sleepers.
- Can help support the reuse of old sleepers.
- Holds the piece during drying and transport.
Need a custom size?
Send the measurements or a photo of the piece. Our team will help identify the right line and prepare a quote.