Stainless Steel 316 Threaded Fittings
Connection type, inch size, and design determine which threaded fitting is suitable for a pipe connection. This category organizes double nipples, pipe nipples, couplings, reducing couplings, elbows, and tees according to the features stated in the product text.
Selection by Connection and Use
For stainless steel 316 threaded fittings, selection starts with the pipe route. The design determines whether two pipe sections are joined in a straight line, a change in diameter is accommodated, the direction is changed, or a branch is created. The product data in this category includes double nipples, pipe nipples, couplings, reducing nipples, reducing couplings, elbows, and tees. Connection side, inch size, material specification, and, when stated in the relevant data record, pressure and temperature complete the selection.
The abbreviations AG and IG describe the threaded side: AG means male thread, while IG means female thread. An entry such as 2 inch AG x 1 inch IG therefore names two different connection sides. The mating fitting must match the relevant abbreviation and inch size at both ends. The spelling used in the product record is the most reliable guide.
The Designs and Their Function
Straight Connections: Double Nipples, Pipe Nipples, and Couplings
A double nipple has a male thread on both sides. For the 1 1/2 inch item, the product description explicitly specifies a male thread at both ends; further product-specification examples include double nipples in 3/4 inch and 3/8 inch. A pipe nipple adds a pipe length to the straight connection: the listed 1/2 inch item is 300 mm long and has male threads at both ends. A coupling, by contrast, has two female threads. The product specifications include, among other examples, 1/2 inch and 1 1/2 inch IG. The key question is therefore whether the two mating parts have female or male threads.
Transitions, Direction Changes, and Branches
Reducing nipples connect different thread sizes and are listed with specific combinations such as 1 1/2 x 1 inch, 2 inch AG x 1 1/2 inch AG, or 2 inch AG x 1 inch IG. A reducing coupling can connect two female threads with different sizes; one documented example is 1 inch IG x 3/4 inch IG. Elbows change the pipe route in a 90° configuration or at 45°. A 1 inch IG item has two female threads and a 90° configuration, while the 1/4 inch 45° item specifies a smaller connection size. The 1 1/2 inch IG tee has three female threads and a 90° configuration. For a branch, the number of connections is therefore just as relevant as the threaded side.
AG and IG: Reading Threaded Connections
A double nipple with two male threads requires two female threads on the mating fitting. A coupling with two female threads correspondingly receives two male threads. With mixed connections, the order after the x indicates which side is male and which is female. The 2 inch AG x 1 inch IG reducer is a clear example; the larger size does not automatically mean the same connection type on the other side.
For the 1 inch IG 90° elbow, the product card lists two female threads, a Whitworth pipe thread, and tapered male threads in its technical specifications. The 2 inch AG x 1 inch IG reducer also lists a Whitworth pipe thread. These details belong to the specific item in each case. For installation planning, thread type, connection side, and sealing material suitable for the system should be considered together.
Inch Size, Reduction, and Installation Position
The inch size describes the connection size of the relevant item. A straight 1/2 inch coupling is therefore not the same as a 1 inch IG x 3/4 inch IG reducing coupling. For a 1 1/2 x 1 inch reducing nipple, the transition between two sizes is the main feature. For large pipes, another reducing nipple is listed as 2 inch AG x 1 1/2 inch AG. Before choosing, both sizes should be checked against the existing connections.
Installation position also affects the design: 90° elbows turn around a corner, 45° elbows create a shallower change of direction, and tees divide a route. For pipe nipples, length may also be decisive. The product data for the 1/2 inch and 300 mm item must not be applied to other pipe nipples whose titles specify different dimensions.
Material Specifications and Technical Values
The category name refers to stainless steel 316. The documented product cards also provide specific material details: the tee, the 1 1/2 inch double nipple, and several reducing nipples specify V4A or V4A (316). The wall elbow with 1 inch IG, by contrast, is described as stainless steel 304 or V2A. For material-based selection, the specification for the individual item matters rather than the design alone.
Pressure and temperature values are likewise specific to each item. For the 1 inch IG 90° elbow, up to 10 bar and –20 °C to +200 °C are stated. The product specifications for the 1 1/2 inch coupling give the same pressure and temperature ranges. The 1 1/2 x 1 inch reducing nipple lists a temperature of up to 200 °C; the 3/4 inch double nipple is listed with up to 200 °C and up to 10 bar. These values apply only to the specified product cards.
Product Examples by Use
The following three product cards show different designs. Their dimensions, material, and weight are taken from the respective product specifications and are not representative of every variant.
Reducing Nipple 1 1/2 x 1 inch
Stainless steel fitting with a reducing nipple and V4A specification. The product description states a transition between different thread sizes and temperatures up to 200 °C. Weight: 0.16 kg.
Tee 1 1/2 inch IG, 90°
The tee has three female threads, a 90° configuration, and the material specification V4A (316). It is designated 1 1/2 inch IG. Weight: 0.38 kg.
Double Nipple 1 1/2 inch, V4A
The item is described with male threads at both ends in 1 1/2 inch and V4A. The product specifications give a weight of 0.15 kg. It is an example of a straight connection with two male threads.
Subcategories by Design
Dividing the range by design shortens the search: straight connectors, couplings, reducers, and elbows and bends lead to different selection questions. The cards link to the relevant subcategories.
Double Nipples + Pipe Nipples
Straight connection parts with the connection dimensions stated for each item.
Couplings
Designs with female threads; the product specifications include 1/2 inch and 1 1/2 inch IG examples.
Reducing Fittings
Transitions with two different thread sizes, for example AG x AG or AG x IG.
Elbows + Bends
Direction changes at 45° or 90° in the sizes specified for the item.
Editorial Article
Sealing and Supplementary Parts
A threaded connection involves the sealing material as well as the fitting. The product card for the 1 inch IG 90° elbow lists hemp and Teflon tape as possible sealing materials. The product list also includes sealing hemp, Teflon tape, and sealing thread. The Teflon tape name includes 1/2 inch x 10 m, PTFE, and a thickness of 0.1 mm; the sealing hemp is listed as 180–200 g. These details refer to the respective accessory items.
Unions, manifolds, and wall brackets also form separate designs. In the product names of several unions, the descriptor “conical” is included. A wall elbow with 90° and 1 inch IG is documented as a specific item; the tee with three female threads shows another option for several connection directions. For caps and plugs, the product list includes both female and male threads, among other options. One specific coupling variant is listed as Stainless Steel Coupling, 1/2 inch, V4A, Threaded Fitting.
Frequently Asked Questions About Selection
What do IG and AG mean?
IG means female thread, and AG means male thread. The notation 1 inch IG describes a female thread in this size. With AG x IG, two different connection sides are given in the stated order.
When is a double nipple suitable, and when a coupling?
A double nipple has two male threads and therefore connects two mating parts with female threads. A coupling has two female threads and receives two male threads. The required size is stated for the specific item.
How do a reducing nipple and a reducing coupling differ?
The reducing nipple is listed with different size combinations such as 1 1/2 x 1 inch or 2 inch AG x 1 inch IG. The 1 inch IG x 3/4 inch IG reducing coupling, by contrast, has two female threads. The choice therefore depends on the connection side as well as the size.
Which design turns around a corner or creates a branch?
Elbows and bends are designated as 45° or 90°. The 1 1/2 inch IG tee has three female threads and a 90° configuration. A 90° elbow changes the direction, while the tee brings several connection directions together.
Which material and pressure specification applies to the desired item?
The specifications are item-specific. The data for several items states V4A or V4A (316), while the 1 inch IG wall elbow is listed as stainless steel 304 or V2A. Individual elbows and couplings are listed with up to 10 bar and –20 °C to +200 °C; these values must not be applied generally to all variants.