Double Joint Kit for Post Assembly Insertion, Steel

Caution
Product Description
Fastening securely from 2 parts is enabled. It can achieve one of the tightest fastening out of all hidden joints.
Dimensional Drawing of Blind Joint Parts
HPJN(Post-insertion double Blind Joint Parts)
① Post-insertion double Blind Joint Parts A
② Rear-insertion double Blind Joint Parts B
③Blind Joint Parts pipe

| Part Name | [M] Blind Joint Parts Material | |
| Post-insertion double joint (A/B) | SCS13 | |
| Blind Joint Parts Pipe | No.5−20 No.5−25 No.5−60 | SUS304 equivalent (sintered) |
| No.5−40 | SUS304 | |
| Hexagonal Socket Head Bolt | SUS304 | |
Specification Table of Blind Joint Parts
| Blind Joint Parts Model |
| HPJN5-20 |
・To check the latest price, please click the "Check Price" button after confirming the model number.
| Blind Joint Parts Model | accessories | ||||||||
| Blind Joint Parts Type | No. | ① Post-insertion double joint A | Quantity | ② Rear-insertion double joint B | Quantity | ③Blind Joint Parts pipe | Quantity | ④Hexagon socket head bolt | Quantity |
| HPJN | 5−20 | Rear-insertion double joint A5 | 1 | Rear-insertion double joint B5 | 1 | Joint Pipe 5-20 | 1 | M3×15 | 1 |
| 5−40 | Blind Joint Parts Pipe 5-40 | M3×35 | |||||||
| 5-25 | Blind Joint Parts pipe 5-25 | M3 x 20 | |||||||
| 5-60 | Joint Pipe 5-60 | M3×55 | |||||||
| Part Name | L | D | d |
| Joint Pipe 5-20 | 8 | 7 | 4.7 |
| Joint Pipe 5-40 | 28 | ||
| Joint pipe 5-25 | 13 | ||
| Joint Pipe 5-60 | 48 |
. ③ Blind Joint Parts pipe
| Rear-mount double joint kit | Compatible frame number | [Exception] Unusable frames | |
| HPJN5-20 | May-2020 | Cannot be used on surfaces without grooves . | |
| HPJN5-40 | 5−2040 | 5−4040 | |
| HPJN5-25 | 5-2525 | 5-2550 | |
| HPJN5-60 | 5-2060 | 5-4060 | |
How to Connect of Blind Joint Parts
| procedure | Front View | Side View | explanation | How to specify the model (for 30mm square) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | ![]() | ![]() | ![]() | First, insert the Blind Joint Parts pipe C into the M hole on the frame ①. |
| ||||||||||||||
| 2 | ![]() | ![]() | Place the rear-mount double Blind Joint Parts Ⓐ Ⓑ horizontally and insert it into the groove of the frame ②. | ![]() | |||||||||||||||
| 3 | ![]() | ![]() | ![]() | Rotate the rear-insertion double Blind Joint Parts Ⓐ and Ⓑ by 90 degrees. | |||||||||||||||
| 4 | ![]() | ![]() | Insert the rear-mount double Blind Joint Parts Ⓐ and Ⓑ into the grooves of the frame. | ![]() | |||||||||||||||
| 5 | ![]() | ![]() | ![]() | Insert the hexagon socket bolt into the countersunk hole of post-assembly double Blind Joint Parts Ⓐ. | |||||||||||||||
| 6 | ![]() | ![]() | When the hexagonal socket bolt is tightened with a hexagonal wrench, frames ① and ② are pulled upward, joining the frames together. | ![]() | |||||||||||||||
*Note:
When tightening the bolt, hold the Blind Joint Parts with your fingers while tightening. (1) This
will ensure that the bolt is securely fastened in the center position without protruding from the frame. (2)
If you tighten the bolt without holding it down, it may be tightened in a position that protrudes from the frame. (3)

・Example of mounting to a frame

| symbol | Product name | Blind Joint Parts Model |
|---|---|---|
| (1) | Aluminum frame M hole additional machining | HFS5-2020-1000-LMH |
| (2) | Aluminum frame | HFS5-2020-1000 |
| (3) | Rear-mount double joint kit | HPJN5-20 |
Product Comparison Information of Blind Joint Parts
■5 Series Blind Joint
| Product name | Post-insertion double Blind Joint Parts | Screw Blind Joint Parts | Tapping Blind Joint Parts | Center Blind Joint Parts | Parallel Blind Joint Parts |
|---|---|---|---|---|---|
| Product Photos | ![]() | ![]() | ![]() | ![]() | ![]() |
| Installation Diagram | ![]() | ![]() | ![]() | ![]() | ![]() |
| Blind Joint Parts Material | Equivalent to SCS13/SUS304 | Iron or SUS304 | SWCH-18A | SCS13 | SCS13/SUS304 |
| Blind Joint Parts Features | Stable fastening is possible from two points. This is the strongest fastening possible with Blind Joint Parts. | The plate allows for reliable and inexpensive connection. | No additional tapping holes are required. This is the most inexpensive Blind Joint Parts. | This is the most common blind joint that can be used with a wide range of aluminium frames. | The frames can be connected side-by-side. |
| 5 Series Product Page | Viewing | Product page | Product page | Product page | Product page |
Related Items of Blind Joint Parts
■5 Series (groove width 6mm)
| Product name | Aluminum frame | Blind Joint Parts | Frame cap | Groove cover | nut |
|---|---|---|---|---|---|
| photograph | ![]() | ![]() | ![]() | ![]() | ![]() |
| Product page | Here | Here | Here | Here | Here |



































