Straight Connectors and Adapters for Lubrication Tubing
These components join tubing runs in industrial lubrication circuits where a direct, in-line path is required. Straight connectors and adapters are not one interchangeable series; each family has specific body styles and tube compatibility. A central lubrication system relies on correct fitting selection to avoid leaks.
Connector Families in the Bijur Delimon Catalog
Bijur Delimon separates straight connectors into several distinct families. Quick-connect straight coupling assemblies include brass and nickel-brass versions for 4 mm, 6 mm, and 8 mm metric tube, plus 5/32 in and 1/4 in inch tube. Example part numbers include 35526, 34021-1, 60075, AR2059, and AR2061.
Threaded straight adapters, some marked STL steel, cover specific thread forms. Part 73442-1114 is an Adapter Straight 1/8 BSPT for 4 mm tubing. Part 73442-1214 is an Adapter Male Connector 1/8 BSP for 6 mm tubing.
PTC straight fittings include AR1858, a straight connector G1/4 for 8 mm tubing. A straight G1/8 for 6 mm version also exists. Straight nipples M8 x 1 include 34957C close style without hex and 15822 with hex. See also the quick-plug elbow fitting for angled runs.
Tube Sizes and Matching Inserts
Nylon tubing for these straight connectors is cataloged in 4 mm OD, 6 mm OD, and 8 mm OD sizes. The 4 mm OD nylon tube is part 5N25; the 6 mm OD x 4 mm ID nylon tube is part 35006; an 8 mm OD size is also listed.
Matching tube inserts for nylon systems are part 19268 for 4 mm, part 34836 for 6 mm, and part 34837 for 8 mm. Use inserts to support the tube wall inside push-to-connect and some quick-connect bodies. Copper tubing is cataloged as a separate system with its own fitting tables. Clip material and some body materials must be confirmed at quotation. See Bijur tube clips for mounting support.
Choosing Between Families
Select a family based on the tube material, thread standard, and service conditions. Quick-connect straight coupling assemblies are available in brass and nickel-brass; nickel-brass is not universal, so state the required body material. Threaded straight adapters marked STL are steel, but confirm coating and pressure rating at quotation.
PTC straight fittings accept nylon tube without a separate ferrule in many cases, but the insert remains recommended. Straight nipples M8 x 1 join two internal or external ports directly. Do not mix copper and nylon fittings unless the catalog table lists a common part.
Because some body materials and clip materials are not stated in the catalog excerpt, request a quotation to confirm suitability.
Installation Notes
- Cut nylon tube square and push fully into the fitting body before tightening any nut.
- Use the matching tube insert for nylon; 19268 fits 4 mm, 34836 fits 6 mm, 34837 fits 8 mm.
- For threaded adapters 73442-1114 and 73442-1214, apply thread sealant to the pipe thread only if required by system pressure.
- Do not overtighten brass quick-connect bodies; seating is by stop, not torque.
- Verify copper fittings against copper-specific tables before ordering.
Ordering and Cross-Reference
This page covers an aftermarket cross-reference selection across the Bijur Delimon straight connector range. Part numbers are designations for identification, not statements of original supply. This site can confirm interchange and material during quotation.
For a quote, contact the quotation team. State the tube OD, thread form, body material, and quantity when requesting.
Frequently Asked Questions
What do straight connectors do in a lubrication system?
They join two tube ends or a tube and a port along the same axis. This keeps lubricant flow direction stable and reduces fitting stress.
Are all Bijur Delimon straight connectors interchangeable?
No, the catalog lists several separate families with different bodies and thread forms. Mixing families often causes leaks or poor tube support.
Which tube sizes do these straight connectors cover?
Quick-connect assemblies cover 4 mm, 6 mm, and 8 mm metric tube, plus 5/32 in and 1/4 in inch tube. Threaded and PTC families cover smaller subsets of those sizes.
How do I choose between quick-connect and PTC straight fittings?
Quick-connect types often use a separate sleeve or insert, while PTC bodies grip the tube directly. Check whether the catalog table lists your nylon or copper tubing before ordering.
What are part numbers for threaded straight adapters?
Part 73442-1114 fits 1/8 BSPT thread and 4 mm tube, while 73442-1214 fits 1/8 BSP thread and 6 mm tube. Confirm steel marking STL and any coating at quotation.
Do straight nipples need a hex for installation?
Part 34957C uses a close style without hex, while part 15822 includes a hex. Choose a hex style when you need wrench access in tight spaces.
What inserts match the nylon tubing sizes?
Part 19268 matches 4 mm nylon tube, part 34836 matches 6 mm, and part 34837 matches 8 mm. Inserts reinforce the tube wall inside the fitting body.
Can I use copper tubes with these straight connectors?
Copper tubing appears in a separate catalog table with its own fitting part numbers. Do not assume a nylon fitting fits copper unless confirmation is given at quotation.
What materials are available for quick-connect straight couplings?
Brass and nickel-brass versions exist for several metric and inch tube sizes. Not every size is offered in both materials, so confirm availability at quotation.
Who builds and supports these units?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
For ordering assistance, contact the quotation team. Bijur Delimon is a trademark of its respective owner. This page covers aftermarket connectors, not manufactured, sponsored, or endorsed by Bijur Delimon. The part numbers shown are Bijur Delimon designations for cross-reference identification only.
