What the B3784 Does
The B3784 closure plug closes unused 5/16-24 NF ports on Bijur SLR junctions and manifolds. It is an aftermarket replacement part intended for lubrication systems using the Bijur Delimon SLR port configuration.
Bijur Delimon is a trademark of its respective owner. This is an aftermarket plug, not manufactured, sponsored, or endorsed by Bijur Delimon. B3784 and 34496 designations are for cross-reference identification only.
Specifications
| Part numbers | B3784 / 34496 |
| Type | Plug closure |
| Thread | 5/16-24 NF (UNF) |
| Material | Brass (316 stainless option) |
| Hex | 3/8″ |
Why 5/16-24 NF
The 5/16-24 NF thread is a fine-pitch UNF thread that is the standard port thread on Bijur SLR junction hardware. This dedicated thread means these plugs are not interchangeable with NPT or BSP fittings.
Bijur SLR junctions and manifolds use 5/16-24 NF ports because the fine pitch allows a compact junction body with enough thread engagement for small lubrication lines. A pipe thread would require a different sealing approach and would not match the SLR port geometry.
Where Closure Plugs Are Used
Closure plugs go into ports left open when a bearing point is removed or a junction is under-populated. The plug keeps contamination out of the junction body so the remaining lubrication circuits continue to work cleanly.
These plugs are not a substitute for a tube assembly. When a bearing point is active, the port receives a compression nut and sleeve with 5/32″ OD nylon or PA tubing instead of a plug.
The SLR Junction Assembly
A complete SLR junction port uses a B1095 compression nut to secure a B1061 compression sleeve onto 5/32″ (4 mm) OD nylon/PA tubing at junctions that feed a bearing point. The closure plug fills the port where no tube is run.
For systems with many open ports, plugs reduce the chance of debris entering the junction body. The SLR junction depends on the Bijur SLR electric pump to deliver oil through the connected lines.
Brass or Stainless 316
Brass is suitable for general industrial use where oil and mild environmental exposure are the main concerns. Brass machines cleanly and provides a reliable thread fit in SLR junction bodies. Confirm the stainless option and current pricing through the quotation form.
Stainless 316 is the option where corrosion is a concern, such as washdown areas or humid environments. Both materials use the same 5/16-24 NF thread and 3/8″ hex. For wider context, see the oil pump range and the centralized lubrication overview.
Frequently Asked Questions
What thread exactly is the B3784 plug?
The B3784 uses a 5/16-24 NF fine UNF thread. This is the SLR standard port thread, not a pipe thread.
What is the difference between B3784 and 34496?
B3784 and 34496 are the same plug listed under two parts-list numbers. Confirm which number your documentation uses before ordering.
Does the plug include a washer?
A sealing washer is not included and the sealing method is not declared. Confirm whether your junction design expects a sealing washer.
What hex size fits this plug?
The plug has a 3/8″ hex across flats. Use a standard 3/8″ wrench or socket to install or remove it.
What is this plug for versus a tube assembly?
The plug fills the port when no tube is run to a bearing point. Tubes use the B1095 nut and B1061 sleeve instead.
Should I choose brass or stainless 316?
Brass works for general industrial use with oil lubrication. Stainless 316 is better where corrosion is a concern.
Will this fit NPT or BSP manifolds?
No, this plug has a dedicated SLR UNF thread. It will not fit NPT or BSP manifolds.
Which systems does this plug suit?
The plug suits Bijur SLR oil systems with 5/16-24 NF junction ports. It also works where SLR manifolds have unused ports.
Is this made by Bijur Delimon?
This is an aftermarket replacement, not a Bijur Delimon product. It is made to fit the same SLR port dimensions.
How do I get a quotation for this plug?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
You can also request pricing for volume or material options through the quotation form.
