Threaded Pipe & Tube Fittings

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What the range covers

The family covers straight and branching shapes: IHN hex nipples, IHLN extended nipples, IHRN reducing nipples, IFE and IME male elbows, ISE and IRSE male-to-female elbows, IMT and HTU male tees, and IFC crosses.

Series codes group the shapes: C short hex nipple, H hex nipple, R reducing nipple, E elbow, T tee, C cross, P plug or cap. Female parts include the IHC coupling, IPC cap and IPP plug; HEU, HFN, HFMT and HTU bodies take VCR ends.

Design and materials

Bodies are machined from solid bar rather than cast, which keeps the bore concentric and the wall thickness uniform around the thread. Catalogue photography marks the standard material 316L; 316 is the usual alternative.

A threaded joint has no elastomeric seal: the fine tapered NPT thread closes metal to metal, so the fitting is limited by the metal and not by an O-ring or gasket compound.

Selection and installation

Confirm the thread form and size on each port, the shape required, and whether the hex clears nearby pipework. A 1 in elbow needs about 45 mm of swing space; check the L, A or S dimension column.

Apply thread sealant or PTFE tape to male NPT threads, leaving the first two threads bare, and tighten with a wrench. Mixed stainless and carbon steel threads are worth avoiding in wet service.

Standards referenced: NPT thread form per ASME B1.20.1; ISO 7/1 taper and ISO 228 parallel threads on request; Dimensions per catalogue section 3-01 to 3-24, in mm.

Typical duties: Instrument tubing at transmitters and gauges; Small-bore piping on hydraulic and pneumatic panels; Oil and gas skid sample and impulse lines; Chemical dosing and utility lines in petrochemical plants; Water treatment and process lines in pharmaceutical plants; Battery and hydrogen process skids.

Threaded pipe & tube fitting model selection guide

Series / model	Size	Connection	Notes
IHN-2N-2G	1/8 NPT x 1/8 ISO/BSP parallel	NPT male to ISO parallel male	Hex male adapter
IHN-16N-16G	1 NPT x 1 ISO/BSP parallel	NPT male to ISO parallel male	Hex male adapter; largest size in series
IHLN-8N	1/2 NPT	NPT male, both ends	Long hex nipple; length A made to order, e.g. IHLN-8N-100L (A = 100 mm)
IHLN-16N	1 NPT	NPT male, both ends	Long hex nipple; largest size in series
IA-4G-4N	1/4 ISO/BSP parallel x 1/4 NPT	ISO parallel male to NPT female	Adapter, male x female
IA-16G-16N	1 ISO/BSP parallel x 1 NPT	ISO parallel male to NPT female	Adapter, male x female; largest size in series
IRA-8N-4N	1/2 NPT x 1/4 NPT	NPT female to NPT male	Reducing adapter, large female x small male
IRA-16N-12N	1 NPT x 3/4 NPT	NPT female to NPT male	Reducing adapter; largest size in series
IHRC-8N-4N	1/2 NPT x 1/4 NPT	NPT female, both ends	Hex reducing coupling
IHRC-16N-12N	1 NPT x 3/4 NPT	NPT female, both ends	Hex reducing coupling; largest size in series
IPG-8	1/2 ISO parallel	ISO parallel flat gasket (copper)	ISO flat copper gasket
IPG-16	1 ISO parallel	ISO parallel flat gasket (copper)	ISO flat copper gasket; largest size in series
IRSE-8N-4N	1/2 NPT x 1/4 NPT	NPT female to NPT male, 90 deg	Reducing elbow, male x female
IRSE-16N-8N	1 NPT x 1/2 NPT	NPT female to NPT male, 90 deg	Reducing elbow; largest size in series
IME-8N	1/2 NPT	NPT male, both ends, 90 deg	Male elbow
IME-16N	1 NPT	NPT male, both ends, 90 deg	Male elbow; largest size in series

Selection notes: Pages 3-03 to 3-18 print only model code, thread size and mm dimensions; working pressure, temperature basis, body material, seat/packing and Cv are not published on these pages, so no material or rating is stated here. Ask the factory to confirm body material and pressure/temperature ratings before this table is published; the sections divider page (page061) shows a 316L marking on one photographed fitting, but no material specification table accompanies it.

Catalogue reference 3-03, 3-04, 3-07, 3-08, 3-11, 3-12, 3-17, 3-18. Confirm the final rating against the data sheet issued with your order.

See also: Double Ferrule Fittings · High Purity Weld Fittings · Tube Fittings

Frequently asked questions

Which thread standard is used, NPT or BSP?

The standard catalogue line is NPT to ASME B1.20.1, in 1/8 to 1 in. ISO 7/1 taper threads and ISO 228 parallel threads are available on request, and the IHN series includes ISO parallel Pipe thread columns, so state the requirement when enquiring.

What is the pressure rating of these fittings?

Catalogue tables on pages 3-01 to 3-24 give dimensions only, with no pressure or temperature column. A threaded joint is also limited by the mating pipe and by how it is made up, so ratings are confirmed for the exact size, material and thread combination.

What documents, minimum order and lead time apply?

Minimum order quantities and lead times depend on how many catalogue lines the order touches; a mixed order ships as one consignment. Quotes follow catalogue part numbers, or send a line list and we map each item to a series code.