Linear Bar Connector 8/10 with Top Thread
Hidden bar connector made in one length that serves both the 8 mm and the 10 mm slot ranges, so one part covers 40 and 45 series frames end to end.
| Material | Zinc-plated steel or stainless steel bar; steel connecting screw |
|---|---|
| Alloy Grade | Not applicable |
| Temper | custom |
| Section Size | Fits the core hole of 40 and 45 series and 40x80 / 45x90 |
| Slot | Access hole Ø9 mm; top thread M6-M8 |
| Length | Bar 100-110 mm; connecting screw M8 x 40-45 mm |
| Tolerance | ±0.1 mm on bar diameter |
| Surface | Zinc plated; stainless option |
| MOQ | 500 |
| Lead Time | 15-25 days after deposit |
| Loading Port | Shanghai / Ningbo |
| Supply Ability | 120,000 pcs per month |
| Payment Terms | T/T 30% deposit + 70% before shipment | L/C at sight |
| Trade Terms | FOB | CIF | EXW |
| Certifications | ISO 9001:2015 | ISO 14001 | RoHS | REACH |
Connecting elements · Dual slot
This is a hidden bar connector made in one length that fits both the 8 mm slot range and the 10 mm slot range. The bar itself goes into the core hole, so the slot width does not affect the joint; what the dual designation covers is the access hole and the connecting screw, which are sized to suit either slot standard.
The practical value is a shorter parts list. A manufacturer who builds frames in both 40 series and 45 series, or who supplies both markets, does not have to stock two connectors and train an assembler to keep them apart. One part number covers both, which is the sort of simplification that shows up as fewer build errors rather than as a cost saving.
What the slot width does and does not affect
The bar sits in the core hole of the profile, which is independent of the slot. The core diameter of a 40 × 40 and a 45 × 45 are close enough that one bar serves both, which is what makes the dual part possible. The slot matters for the access hole and for the screw that is reached through it.
A 10 mm slot gives more room to reach the connecting screw, so the access hole can be a little larger and the screw a little easier to get at. On an 8 mm slot the hole is tighter and a ball-ended hex key is often needed. A dual connector is specified with an access hole that works in the narrower slot, so it is usable in both.
| Profile | Slot | Core hole | Access hole | Connecting screw |
|---|---|---|---|---|
| 40 × 40 mm | 8 mm | Ø28 mm | Ø9 mm | M8 × 40 mm |
| 45 × 45 mm | 10 mm | Ø30 mm | Ø9 mm | M8 × 45 mm |
| 40 × 80 mm | 8 mm | 2 × Ø28 mm | Ø9 mm | 2 × M8 × 40 mm |
| 45 × 90 mm | 10 mm | 2 × Ø30 mm | Ø9 mm | 2 × M8 × 45 mm |
- Confirm the core hole, not the slot. The bar is sized by the core diameter. Two profiles with the same slot can have different core holes, so the section drawing is what matters.
- The access hole is the limiting dimension. It has to be reachable in the narrower slot, so the dual part is designed around the 8 mm case.
- Do not mix the series in one frame. The connector covers both series, but the plates, feet and castors do not. A frame is still built in one series.
Practical point: if you build in both 40 and 45 series, standardising on this connector removes a line from the store and a decision from the assembly bench. That is usually worth more than the small price difference against two single-slot parts.
Frequently asked questions
Will one connector really fit both slots?
Yes. The bar fits the core hole, which is common to both ranges, and the access hole is sized for the narrower 8 mm slot so it works in either.
Do I need different screws for the two series?
The connecting screw length differs slightly, because a 45 series member is thicker. The connector is supplied with the screw matched to the profile ordered.
Does the top thread differ between series?
No. The top thread is tapped at the joint face and is the same for both, so the same cap or fitting screws into either.
Is the joint as strong as the single-slot version?
Yes. The bar is the same and the joint is made the same way. The only difference is the access hole sizing, which is set for the narrower slot.
Can it be used on a 40 × 80 profile?
Yes, in the double-bar version, which has two bars to suit the rectangular section.
Tell us which slot ranges you build in
Tell us the profiles you use across your product range. We will confirm which connectors can be standardised to one part number and return FOB pricing within one working day.
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