# Luer lock and Luer slip to barb adapters: tubing ID sizes 1/16 to 1/4 in (Nordson Value Plastics, Qosina), male and female

> What tubing fits a male Luer lock to barb adapter, and what sizes do Luer barb fittings come in?

- Category: Tri-clamp & pipe › Pipe, tube & threads
- Kind: Standard part
- Basis: Nordson Value Plastics' male Luer-to-barb catalog page (distributor copy), Qosina's Luer-lock-to-barb sample kit page, Darwin Microfluidics' listing as a cross-check; tube ID per part, numbers only
- Page: https://xemstudio.com/objects/luer-to-barb-adapters/ · JSON: https://xemstudio.com/api/geometry?object=luer-to-barb-adapters · Plain text: https://xemstudio.com/objects/luer-to-barb-adapters/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no tolerance added.

## Notes

- The sources print the tubing inside diameter each barb is made for, and nothing else about the barb: no barb outside diameter, no length. So this page is a tube-size table, not a barb drawing. Nordson Value Plastics sorts its barbs into series (200, 300, 400, 500, as printed; the numbers are series names, not dimensions) and lists male Luer lock (integral lock ring), male Luer slip, and fittings made to fit a separate rotating or stationary lock ring. Qosina's polycarbonate kit lists a female and a male Luer lock barbed connector for each of six tube IDs. Darwin Microfluidics' male Luer lock to barb adapters (1/16, 3/32, 1/8 in ID, polypropylene or nylon) agree with the matching Nordson sizes.
- Tube size means the inside diameter of the soft tube that is stretched over the barb: 1/16 in (1.6 mm), 3/32 (2.4 mm), 1/8 (3.2 mm), 5/32 (4.0 mm), 3/16 (4.8 mm), 1/4 (6.4 mm). Nordson prints one oddity, .170 in (4.3 mm), for a 400-series part. Qosina prints the exact inch value too (for example 3/16 in = 0.188 in = 4.76 mm). mm values in the last column are the sources' own where printed and the inch value × 25.4 otherwise.
- The Luer end is the 6 % cone of luer-connectors-iso-594-80369-7. A 4 × 6 mm silicone or airline tube (4 mm ID) is closest to the 5/32 in (4.0 mm) barb; 3/16 in ID airline tubing matches the 3/16 in (4.8 mm) barb: see aquarium-airline-tubing. Which barb is right for your tube is a matter of the maker's data; this page does not rate fits.
- No file: barb OD, length and barb profile are not published as numbers in any source read. Qosina publishes CAD for its Luer parts for registered users and Nordson Medical publishes models on its site; linked, not copied.

## Sizes

| maker | type | part number(s) | barb series | tube ID (in) | tube ID (mm) |
|---|---|---|---|---|---|
| Nordson Value Plastics | Male Luer integral lock ring | MTLL210 / MTLL410 / MTLL004 | 200 / 400 / 500 | 1/16 in | 1.59 mm |
| Nordson Value Plastics | Male Luer integral lock ring | MTLL420 / MTLL007 / MTLL220 | 400 / 500 / 200 | 3/32 in | 2.38 mm |
| Nordson Value Plastics | Male Luer integral lock ring | MTLL230 / MTLL013 / MTLL430 | 200 / 500 / 400 | 1/8 in | 3.17 mm |
| Nordson Value Plastics | Male Luer integral lock ring | MTLL240 / MTLL025 | 200 / 500 | 5/32 in | 3.97 mm |
| Nordson Value Plastics | Male Luer integral lock ring | MTLL250 / MTLL450 / MTLL035 | 200 / 400 / 500 | 3/16 in | 4.76 mm |
| Nordson Value Plastics | Male Luer integral lock ring | MTLL445 | 400 | .170 in | 4.3 (as printed) mm |
| Nordson Value Plastics | Male Luer integral lock ring | MTLL360 / MTLL055 | 300 / 500 | 1/4 in | 6.35 mm |
| Nordson Value Plastics | Male Luer slip | MTLS210 / MSL004 | 200 / 500 | 1/16 in | 1.59 mm |
| Nordson Value Plastics | Male Luer slip | MTLS220 / MSL007 | 200 / 500 | 3/32 in | 2.38 mm |
| Nordson Value Plastics | Male Luer slip | MTLS230 / MSL013 | 200 / 500 | 1/8 in | 3.17 mm |
| Nordson Value Plastics | Male Luer slip | MTLS240 / MSL025 | 200 / 500 | 5/32 in | 3.97 mm |
| Nordson Value Plastics | Male Luer slip | MSL035 | 500 | 3/16 in | 4.76 mm |
| Nordson Value Plastics | Male Luer slip | MSL055 | 500 | 1/4 in | 6.35 mm |
| Nordson Value Plastics | Male Luer, rotating lock ring compatible | MLRL004 / 007 / 013 / 025 / 035 / 055 | 500 | 1/16, 3/32, 1/8, 5/32, 3/16, 1/4 in | 1.59, 2.38, 3.17, 3.97, 4.76, 6.35 mm |
| Nordson Value Plastics | Male Luer, stationary lock ring compatible | MLSL004 / 007 / 013 / 025 / 035 / 055 | 500 | 1/16, 3/32, 1/8, 5/32, 3/16, 1/4 in | 1.59, 2.38, 3.17, 3.97, 4.76, 6.35 mm |
| Qosina (sample kit Q3000-PC) | Female / male Luer lock, barbed (PC) | 11544 / 11545 | — | 1/16 in (0.063 in) | 1.59 mm |
| Qosina (sample kit Q3000-PC) | Female / male Luer lock, barbed (PC) | 11546 / 11547 | — | 3/32 in (0.094 in) | 2.38 mm |
| Qosina (sample kit Q3000-PC) | Female / male Luer lock, barbed (PC) | 11548 / 11549 | — | 1/8 in (0.125 in) | 3.18 mm |
| Qosina (sample kit Q3000-PC) | Female / male Luer lock, barbed (PC) | 11550 / 11551 | — | 5/32 in (0.156 in) | 3.97 mm |
| Qosina (sample kit Q3000-PC) | Female / male Luer lock, barbed (PC) | 11552 / 11553 | — | 3/16 in (0.188 in) | 4.76 mm |
| Qosina (sample kit Q3000-PC) | Female / male Luer lock, barbed (PC) | 11554 / 11555 | — | 1/4 in (0.25 in) | 6.35 mm |

## Where the files are

- Nordson Value Plastics (distributor copy of catalog page vp022): [Male Luer to barb fittings: part numbers, barb series, tube ID (integral lock ring, slip, rotating / stationary lock ring compatible)](https://pdf2.chromtech.net.au/vp022_Luers-Male_6-11.pdf) — web — Maker catalog page; numbers only
- Qosina: [Polycarbonate Luer locks to barb connectors sample kit Q3000-PC: male and female Luer lock, barbed, parts 11544-11555 and the tubing ID each fits](https://www.qosina.com/pc-luer-lock-to-barb-connector-sample-kit-q3000-pc) — web — Maker page; numbers only. CAD behind a free log-in, not copied
- Darwin Microfluidics: [Male luer lock to barb adapters pack of 10: tubing ID 1/16, 3/32, 1/8 in (cross-check)](https://darwin-microfluidics.com/products/male-luer-lock-to-barb-adapters-pack-of-10) — web — Distributor page; numbers only

## Questions

**Which Luer barb fits 4 mm ID tubing?**

The nearest sizes printed are 5/32 in (4.0 mm ID, Nordson MTLL240, MTLS240, MSL025; Qosina 11550/11551) and 3/16 in (4.8 mm ID). The sources do not say how much a barb oversizes the tube.

**What tube sizes do male Luer lock barbs come in?**

1/16, 3/32, 1/8, 5/32, 3/16 and 1/4 in ID in the Nordson and Qosina listings read here, plus a .170 in (4.3 mm) part.

## Fits with

- [Luer connectors (ISO 594 / ISO 80369-7): 6% taper dimensions, male and female Luer slip and Luer lock, + true-size taper gauges](https://xemstudio.com/objects/luer-connectors-iso-594-80369-7/)
- [Silicone tube 1 × 3 to 10 × 14 mm (ID × OD)](https://xemstudio.com/objects/silicone-tube/)
- [Aquarium airline tubing and fittings: 3/16 in vs 4 × 6 mm, check valves, connectors and Luer barb match](https://xemstudio.com/objects/aquarium-airline-tubing/)
- [Tri-clamp × hose barb adapters (14MPHR style): ½ to 4 in clamp, ¼ to 4 in hose](https://xemstudio.com/objects/tri-clamp-hose-barb-adapters/)
- [Plastic syringes 1–60 mL as pistons and cylinders](https://xemstudio.com/objects/plastic-syringes/)
- [Drip irrigation tubing sizes: 1/8, 1/4 and 1/2 in poly tubing, ID x OD (0.170 x 0.250, 0.600 x 0.700 in)](https://xemstudio.com/objects/drip-irrigation-tubing-sizes/)