NPS 1/2 Pipe Nipple, ASTM A733

Threaded 14 TPI NPT at each end, the NPS 1/2 pipe nipple (ASTM A733) is cut from 21.336 mm Schedule 40 pipe with a 2.7686 mm wall. Available in 17 lengths from 28.575 to 304.8 mm, each as simplified and threaded STEP.

How these parts are made, and what the levels mean: read the method

• Also searched as: NPS 1/2 pipe nipple, NPS 1/2 x 28.575 to NPS 1/2 x 304.8 pipe nipples
• Model id: astm-a733-nps1-2
• Standard: ASTM A733 · NPS 1/2, pitch 1.814 mm, NPT taper pipe thread (ASME B1.20.1), 60 degree profile, 1:16 taper, right hand

Lengths

Length (mm)	Part key	Simplified	Threaded
28.575	astm-a733-nps1-2x28-575	STEP	STEP
38.1	astm-a733-nps1-2x38-1	STEP	STEP
50.8	astm-a733-nps1-2x50-8	STEP	STEP
63.5	astm-a733-nps1-2x63-5	STEP	STEP
76.2	astm-a733-nps1-2x76-2	STEP	STEP
88.9	astm-a733-nps1-2x88-9	STEP	STEP
101.6	astm-a733-nps1-2x101-6	STEP	STEP
114.3	astm-a733-nps1-2x114-3	STEP	STEP
127	astm-a733-nps1-2x127	STEP	STEP
139.7	astm-a733-nps1-2x139-7	STEP	STEP
152.4	astm-a733-nps1-2x152-4	STEP	STEP
177.8	astm-a733-nps1-2x177-8	STEP	STEP
203.2	astm-a733-nps1-2x203-2	STEP	STEP
228.6	astm-a733-nps1-2x228-6	STEP	STEP
254	astm-a733-nps1-2x254	STEP	STEP
279.4	astm-a733-nps1-2x279-4	STEP	STEP
304.8	astm-a733-nps1-2x304-8	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
l_close_in	Close nipple length, inches		1.125		1.125	nominal	L1
l_close	Close nipple length		28.575		28.575	nominal	L1
D	Outside diameter		21.336		21.336	nominal	L1
T	Wall thickness		2.7686		2.7686	nominal	L1
D_in	Outside diameter, inches		0.84		0.84	nominal	L1
T_in	Wall thickness, inches		0.109		0.109	nominal	L1
n	Threads per inch		14		14	nominal	L1
P	Pitch		0.07142857		0.07142857	nominal	L1
D	Outside diameter of pipe		0.84		0.84	nominal	L1
E0	Pitch diameter at the small end		0.75843		0.75843	nominal	L1
L1	Hand-tight engagement length		0.32		0.32	nominal	L1
E1	Pitch diameter at the hand-tight plane		0.77843		0.77843	nominal	L1
L2	Effective thread length		0.5337		0.5337	nominal	L1
E2	Pitch diameter at the end of the effective thread		0.79179		0.79179	nominal	L1
L4	Overall length of external thread		0.7815		0.7815	nominal	L1
h	Height of thread		0.05714		0.05714	nominal	L1
K0	Basic minor diameter at the small end		0.7013		0.7013	nominal	L1
alpha	Flank angle		60		60	nominal	L1
taper	Taper		16		16	nominal	L1

Drawing

As a PDF: CC-ASTMA733-SZ-1-2.pdf.

The NPS 1/2 pipe nipple beside the NPS 3/8 and the NPS 3/4

The NPS 1/2 is number 4 of the 9 ASTM A733 pipe nipples published here, listed from NPS 1/8 to NPS 2.

• Close nipple length, inches (l_close_in): 1.125 mm on the NPS 1/2 pipe nipple, against 1 mm on the NPS 3/8 and 1.375 mm on the NPS 3/4.
• Close nipple length (l_close): 28.575 mm on the NPS 1/2 pipe nipple, against 25.4 mm on the NPS 3/8 and 34.925 mm on the NPS 3/4.
• Outside diameter (D): 21.336 mm on the NPS 1/2 pipe nipple, against 17.145 mm on the NPS 3/8 and 26.67 mm on the NPS 3/4.
• Wall thickness (T): 2.7686 mm on the NPS 1/2 pipe nipple, against 2.3114 mm on the NPS 3/8 and 2.8702 mm on the NPS 3/4.
• Outside diameter, inches (D_in): 0.84 mm on the NPS 1/2 pipe nipple, against 0.675 mm on the NPS 3/8 and 1.05 mm on the NPS 3/4.
• Wall thickness, inches (T_in): 0.109 mm on the NPS 1/2 pipe nipple, against 0.091 mm on the NPS 3/8 and 0.113 mm on the NPS 3/4.
• Threads per inch (n): 14 mm on the NPS 1/2 pipe nipple, against 18 mm on the NPS 3/8 and 14 mm on the NPS 3/4.
• Pitch (P): 0.07142857 mm on the NPS 1/2 pipe nipple, against 0.05555555 mm on the NPS 3/8 and 0.07142857 mm on the NPS 3/4.

Other sizes

• One size smaller: NPS 3/8 Pipe Nipple, ASTM A733, 18 threads per inch, pipe OD 17.145 mm.
• One size larger: NPS 3/4 Pipe Nipple, ASTM A733, 14 threads per inch, pipe OD 26.67 mm.

Documents

• CC-ASTMA733-DS-NPS1-2.pdf: 1/2 datasheet: values with levels, lengths, sources
• CC-ASTMA733-SZ-1-2.pdf: 1/2 drawing: this size's values on the views
• parts.json: the part record of every length (the platform contract)

Sources

anvil-a733-nipples, engineersedge-npt, engineersedge-npt-basic, etb-b36-10, etb-npt, smithcooper-a733-nipples, steeltube-b36-10, ultimatewasher-npt, wikipedia-npt. Full citations: the method page and this size's datasheet.

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