Airbrush Air Line Adapters: BSP Sizes Explained
By Quality Tools & Supplies for Hobbys, DIY & Crafts - Micro-Mark Tools | Published: 2026-10-18
Category: How-to Guides
Understand BSP air fittings for airbrushes. Learn the difference between 1/8 BSP and 1/4 BSP, and how to choose the right adapter for your compressor and hose.
Quick Answer
BSP (British Standard Pipe) is the thread standard used on most airbrush fittings. To connect an airbrush with a 1/8 inch BSP male fitting to a compressor with a 1/4 inch BSP female output, you need a 1/8 inch BSP male to 1/4 inch BSP female adapter.
Why BSP Matters for Airbrushing
Airbrush compressors and hoses often use different thread sizes. BSP (British Standard Pipe) is common on airbrush equipment, while NPT (National Pipe Thread) is typical on larger compressors. Using the wrong adapter can cause air leaks or damage threads. Always check your equipment's thread type and size before buying an adapter.
Frequently Asked Questions
- What is the difference between BSP and NPT?
- BSP (British Standard Pipe) and NPT (National Pipe Thread) are both thread standards but they are not interchangeable. BSP threads have a 55-degree angle, while NPT threads have a 60-degree angle. Always match thread type and size to avoid leaks.
- How do I know which adapter I need?
- Check the thread size and type on your airbrush, hose, and compressor. Common sizes are 1/8 inch BSP and 1/4 inch BSP. If your compressor uses 1/4 inch NPT, look for an adapter that converts to BSP. Measure the thread diameter if you are unsure. Use a thread gauge or compare with a known fitting to confirm thread type and size.
- Can I use a 1/8 inch BSP to 1/4 inch BSP adapter with an NPT compressor?
- Yes, if the adapter is specifically designed for that purpose. For example, the Micro-Mark Air Line Adapter (1/8 inch BSP male to 1/4 inch BSP female) is compatible with 1/4 inch NPT male compressor output fittings. Always verify compatibility before purchasing. Look for adapters that explicitly mention NPT compatibility on the female side.
Adapter Options at Micro-Mark
- Micro-Mark Air Line Adapter for Airbrushes, 1/8 Inch BSP Male to 1/4 Inch BSP Female: This adapter converts a 1/8 inch BSP male fitting to a 1/4 inch BSP female fitting. It is compatible with 1/4 inch NPT male typical compressor output fittings. Lets you connect an airbrush with a standard 1/8 inch BSP male fitting to a compressor that has a 1/4 inch NPT female output, bridging the most common thread gap.
Micro-Mark Air Line Adapter for Airbrushes, 1/8 Inch BSP Male to 1/4 Inch BSP Female - Micro-Mark Air Line Adapter for Airbrushes ,1/8 Inch BSP Male to 1/4 Inch BSP Male: This adapter converts a 1/8 inch BSP male fitting to a 1/4 inch BSP male fitting. Designed specifically for use with airbrush equipment. Useful when your hose has a 1/4 inch female fitting but your airbrush or compressor has a 1/8 inch female port, allowing you to use larger hoses with smaller equipment.
Micro-Mark Air Line Adapter for Airbrushes ,1/8 Inch BSP Male to 1/4 Inch BSP Male
