All sizes up to 4” diameter are of our typical manufacture.

Larger sizes may be available upon customer request.

These parts can be made to fit any design and size allowed for in MSS-SP95. Additional sizes can be manufactured to customer design specification.


Parts can be manufactured out of material conforming to ASTM specifications A105, A234 WPB, A403, A420, B564, or any of their ASME equivalents.

Piping components can be made to customer material specifications and out of most brass and carbon, stainless, or alloy steels as required.

MSS-SP-95 Swage nipples

Swage Nipples

MSS SP-95-2018 Swage(d) Nipples and Bull Plugs

This Standard Practice covers dimensions, finish, tolerances, marking, and material for carbon steel and alloy steel Swaged (a) Nipples (male-end reducing fittings), NPS 1/8 through NPS 12 (DN 6 through DN 300) and Bull Plugs (hollow or solid male closures), NPS 1/8 through NPS 12 (DN 6 through DN 300). These fittings are made with ends that are threaded, beveled, square cut, grooved, or any combination of these. Both concentric and eccentric Swaged Nipples are included.

Partial Compliance Fittings Fittings with special dimensions and fittings made from non-standard materials may be designed and manufactured by agreement between the manufacturer and the purchaser, provided they are marked in accordance with the requirements for partial compliance fittings of Section 4.1(e).

“Thanks for being a partner for many years… Colonial has provided and advised us of any stub end needs for welding fittings.”

“Great company and great people.”

“We appreciate the relationship we have with Colonial.”

“You have always been very helpful and timely with your responses.”

“Great company and super people. Been doing business with Colonial Machine for over 40 years. Very knowledgeable.”

“Overall the customer service is very good.”

“It is a pleasure to do business with Colonial Machine.”

“Colonial Machine is a preferred partner for us as they are a great company to work with.”

“I have been working with Colonial Machine for the past 13 years and they are a very knowledgeable machine shop that can produce quality parts.”

“Honestly one of the best companies that I’ve dealt with in my 44 years in the business.”

“Colonial is one of our favorite vendors!”

“Customer service responds promptly and very courteous to work with.”

Industrial Piping Components for the Nuclear Power and High-Pressure Piping Industries