What is the difference between automotive and industrial air fittings....these indicate they are M fittings...exactly what are M fittings...

1/4" type V HVLP High Volume Low Pleasure fittings & connectors, they have a much larger hole which allows for more airflow so your tools will make more power than with the smaller type A or M that most people use. I recently replaced all my fittings in the shop because I had an assortment of all things air from 20-30 years of acquiring. The advantage of type V couplers is that you can use tools with type A & type M fittings along with the type V kind of a universal receiver however the reverse is not true, type V fittings WILL NOT work in type A or type M couplers. If you are using them for home shop, type M is fine the ones I have are working great form, fit, and function are great.

are they made In USA?

I looked and cannot find a marking that indicates whether or not this is the case. But, they are machined precisely and work well, which is the key thing. Given the present attitude about mining, I'd guess the copper came from Chile, the zinc may or may not be from the US, and the steel is probably a US product. If they can be made by extrusion and/or cold heading they are probably a US product.

Are they still made in the usa?

Indeed they are, which is why it's my brand of choice. Below is a link to their website for this product.http://www.miltonindustries.com/couplers-and-plugs/m-style/12-piece-m-style-coupler-kit.html

Will the quick coupler fit on a Porter Cable PCFP02003 pancake compressor with 3/8 inch hose? Thanks

They worked on all my 3/8" hose connections as well as my compressor

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Description

⚡ Elevate your air tool game with Milton’s M-Style precision and durability!

COMPLETE KIT - 12-piece set includes female couplers and male/female plugs for versatile setups
BUILT TO LAST - Durable brass couplers with rust-resistant, case-hardened steel plugs
POWERFUL PERFORMANCE - Handles up to 300 PSI and 40 SCFM for demanding air tool needs
SEAMLESS COMPATIBILITY - Kwik-Change® design fits most brands effortlessly
HEAT CORROSION RESISTANT - Engineered to endure high temps and resist corrosion for long-term reliability

The Milton S-210 12 Piece M-Style Coupler Kit offers a professional-grade pneumatic accessory set featuring 1/4" NPT fittings, Kwik-Change® compatibility with most manufacturers, and robust materials including brass and case-hardened steel. Designed for high performance, it supports up to 300 PSI, 40 SCFM airflow, and temperatures up to 250°F, making it an essential upgrade for any serious air tool user.

Specifications

Manufacturer	Milton
Part number	S-210
Item Weight	45.4 g
Product Dimensions	11.75 x 10.16 x 3.81 cm; 45.36 g
Item model number	S-210
Size	1/4 inch
Color	Brass
Style	Basic
Material	Brass Alloy Steel
Item Package Quantity	1
Number Of Pieces	12
Measurement System	Inch
Special Features	BASIC FLOW SIZE: All 1/4" body size air fittings. 1/4" NPT. Buna-N seals. Couplers for air shop use. -KWIK-CHANGE®: Interchangeable/compatible with most manufacturers. -MAXIMUM: 40 SCFM. 300 PSI. Temperatures up to 250 degrees F. -QUALITY: Durable brass couplers. Case-hardened steel plugs, plated to resist rust and corrosion. -M-STYLE KIT INCLUDES: (2) Female Couplers, (8) Male Plugs, and (2) Female Plugs. [Milton #715, #727, #728]. - -
Included components	1 Milton Branded Product
Batteries Included?	No
Batteries Required?	No

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