NPS 3/4 Pipe Nipple, ASTM A733

The NPS 3/4 pipe nipple (ASTM A733) joins two NPS 3/4 NPT fittings: Schedule 40 pipe 26.67 mm across with a 2.8702 mm wall, threaded 14 threads per inch at both ends. It comes in 17 lengths from 34.925 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 3/4 pipe nipple, NPS 3/4 x 34.925 to NPS 3/4 x 304.8 pipe nipples
• Model id: astm-a733-nps3-4
• Standard: ASTM A733 · NPS 3/4, 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
34.925	astm-a733-nps3-4x34-925	STEP	STEP
38.1	astm-a733-nps3-4x38-1	STEP	STEP
50.8	astm-a733-nps3-4x50-8	STEP	STEP
63.5	astm-a733-nps3-4x63-5	STEP	STEP
76.2	astm-a733-nps3-4x76-2	STEP	STEP
88.9	astm-a733-nps3-4x88-9	STEP	STEP
101.6	astm-a733-nps3-4x101-6	STEP	STEP
114.3	astm-a733-nps3-4x114-3	STEP	STEP
127	astm-a733-nps3-4x127	STEP	STEP
139.7	astm-a733-nps3-4x139-7	STEP	STEP
152.4	astm-a733-nps3-4x152-4	STEP	STEP
177.8	astm-a733-nps3-4x177-8	STEP	STEP
203.2	astm-a733-nps3-4x203-2	STEP	STEP
228.6	astm-a733-nps3-4x228-6	STEP	STEP
254	astm-a733-nps3-4x254	STEP	STEP
279.4	astm-a733-nps3-4x279-4	STEP	STEP
304.8	astm-a733-nps3-4x304-8	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
l_close_in	Close nipple length, inches		1.375		1.375	nominal	L1
l_close	Close nipple length		34.925		34.925	nominal	L1
D	Outside diameter		26.67		26.67	nominal	L1
T	Wall thickness		2.8702		2.8702	nominal	L1
D_in	Outside diameter, inches		1.05		1.05	nominal	L1
T_in	Wall thickness, inches		0.113		0.113	nominal	L1
n	Threads per inch		14		14	nominal	L1
P	Pitch		0.07142857		0.07142857	nominal	L1
D	Outside diameter of pipe		1.05		1.05	nominal	L1
E0	Pitch diameter at the small end		0.96768		0.96768	nominal	L1
L1	Hand-tight engagement length		0.339		0.339	nominal	L1
E1	Pitch diameter at the hand-tight plane		0.98887		0.98887	nominal	L1
L2	Effective thread length		0.5457		0.5457	nominal	L1
E2	Pitch diameter at the end of the effective thread		1.00179		1.00179	nominal	L1
L4	Overall length of external thread		0.7935		0.7935	nominal	L1
h	Height of thread		0.05714		0.05714	nominal	L1
K0	Basic minor diameter at the small end		0.9105		0.9105	nominal	L1
alpha	Flank angle		60		60	nominal	L1
taper	Taper		16		16	nominal	L1

Drawing

As a PDF: CC-ASTMA733-SZ-3-4.pdf.

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

The NPS 3/4 is number 5 of the 9 ASTM A733 pipe nipples published here, listed from NPS 1/8 to NPS 2.

• Close nipple length, inches (l_close_in): 1.375 mm on the NPS 3/4 pipe nipple, against 1.125 mm on the NPS 1/2 and 1.5 mm on the NPS 1.
• Close nipple length (l_close): 34.925 mm on the NPS 3/4 pipe nipple, against 28.575 mm on the NPS 1/2 and 38.1 mm on the NPS 1.
• Outside diameter (D): 26.67 mm on the NPS 3/4 pipe nipple, against 21.336 mm on the NPS 1/2 and 33.401 mm on the NPS 1.
• Wall thickness (T): 2.8702 mm on the NPS 3/4 pipe nipple, against 2.7686 mm on the NPS 1/2 and 3.3782 mm on the NPS 1.
• Outside diameter, inches (D_in): 1.05 mm on the NPS 3/4 pipe nipple, against 0.84 mm on the NPS 1/2 and 1.315 mm on the NPS 1.
• Wall thickness, inches (T_in): 0.113 mm on the NPS 3/4 pipe nipple, against 0.109 mm on the NPS 1/2 and 0.133 mm on the NPS 1.
• Threads per inch (n): 14 mm on the NPS 3/4 pipe nipple, against 14 mm on the NPS 1/2 and 11.5 mm on the NPS 1.
• Pitch (P): 0.07142857 mm on the NPS 3/4 pipe nipple, against 0.07142857 mm on the NPS 1/2 and 0.08695652 mm on the NPS 1.

Other sizes

• One size smaller: NPS 1/2 Pipe Nipple, ASTM A733, 14 threads per inch, pipe OD 21.336 mm.
• One size larger: NPS 1 Pipe Nipple, ASTM A733, 11.5 threads per inch, pipe OD 33.401 mm.

Documents

• CC-ASTMA733-DS-NPS3-4.pdf: 3/4 datasheet: values with levels, lengths, sources
• CC-ASTMA733-SZ-3-4.pdf: 3/4 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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