NPS 1 Pipe Nipple, ASTM A733

Threaded 11.5 TPI NPT at each end, the NPS 1 pipe nipple (ASTM A733) is cut from 33.401 mm Schedule 40 pipe with a 3.3782 mm wall. Available in 16 lengths from 38.1 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 pipe nipple, NPS 1 x 38.1 to NPS 1 x 304.8 pipe nipples
• Model id: astm-a733-nps1
• Standard: ASTM A733 · NPS 1, pitch 2.209 mm, NPT taper pipe thread (ASME B1.20.1), 60 degree profile, 1:16 taper, right hand

Lengths

Length (mm)	Part key	Simplified	Threaded
38.1	astm-a733-nps1x38-1	STEP	STEP
50.8	astm-a733-nps1x50-8	STEP	STEP
63.5	astm-a733-nps1x63-5	STEP	STEP
76.2	astm-a733-nps1x76-2	STEP	STEP
88.9	astm-a733-nps1x88-9	STEP	STEP
101.6	astm-a733-nps1x101-6	STEP	STEP
114.3	astm-a733-nps1x114-3	STEP	STEP
127	astm-a733-nps1x127	STEP	STEP
139.7	astm-a733-nps1x139-7	STEP	STEP
152.4	astm-a733-nps1x152-4	STEP	STEP
177.8	astm-a733-nps1x177-8	STEP	STEP
203.2	astm-a733-nps1x203-2	STEP	STEP
228.6	astm-a733-nps1x228-6	STEP	STEP
254	astm-a733-nps1x254	STEP	STEP
279.4	astm-a733-nps1x279-4	STEP	STEP
304.8	astm-a733-nps1x304-8	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
l_close_in	Close nipple length, inches		1.5		1.5	nominal	L1
l_close	Close nipple length		38.1		38.1	nominal	L1
D	Outside diameter		33.401		33.401	nominal	L1
T	Wall thickness		3.3782		3.3782	nominal	L1
D_in	Outside diameter, inches		1.315		1.315	nominal	L1
T_in	Wall thickness, inches		0.133		0.133	nominal	L1
n	Threads per inch		11.5		11.5	nominal	L1
P	Pitch		0.08695652		0.08695652	nominal	L1
D	Outside diameter of pipe		1.315		1.315	nominal	L1
E0	Pitch diameter at the small end		1.21363		1.21363	nominal	L1
L1	Hand-tight engagement length		0.4		0.4	nominal	L1
E1	Pitch diameter at the hand-tight plane		1.23863		1.23863	nominal	L1
L2	Effective thread length		0.6828		0.6828	nominal	L1
E2	Pitch diameter at the end of the effective thread		1.2563		1.2563	nominal	L1
L4	Overall length of external thread		0.9845		0.9845	nominal	L1
h	Height of thread		0.06957		0.06957	nominal	L1
K0	Basic minor diameter at the small end		1.1441		1.1441	nominal	L1
alpha	Flank angle		60		60	nominal	L1
taper	Taper		16		16	nominal	L1

Drawing

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

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

The NPS 1 is number 6 of the 9 ASTM A733 pipe nipples published here, listed from NPS 1/8 to NPS 2.

• Close nipple length, inches (l_close_in): 1.5 mm on the NPS 1 pipe nipple, against 1.375 mm on the NPS 3/4 and 1.625 mm on the NPS 1-1/4.
• Close nipple length (l_close): 38.1 mm on the NPS 1 pipe nipple, against 34.925 mm on the NPS 3/4 and 41.275 mm on the NPS 1-1/4.
• Outside diameter (D): 33.401 mm on the NPS 1 pipe nipple, against 26.67 mm on the NPS 3/4 and 42.164 mm on the NPS 1-1/4.
• Wall thickness (T): 3.3782 mm on the NPS 1 pipe nipple, against 2.8702 mm on the NPS 3/4 and 3.556 mm on the NPS 1-1/4.
• Outside diameter, inches (D_in): 1.315 mm on the NPS 1 pipe nipple, against 1.05 mm on the NPS 3/4 and 1.66 mm on the NPS 1-1/4.
• Wall thickness, inches (T_in): 0.133 mm on the NPS 1 pipe nipple, against 0.113 mm on the NPS 3/4 and 0.14 mm on the NPS 1-1/4.
• Threads per inch (n): 11.5 mm on the NPS 1 pipe nipple, against 14 mm on the NPS 3/4 and 11.5 mm on the NPS 1-1/4.
• Pitch (P): 0.08695652 mm on the NPS 1 pipe nipple, against 0.07142857 mm on the NPS 3/4 and 0.08695652 mm on the NPS 1-1/4.

Other sizes

• One size smaller: NPS 3/4 Pipe Nipple, ASTM A733, 14 threads per inch, pipe OD 26.67 mm.
• One size larger: NPS 1-1/4 Pipe Nipple, ASTM A733, 11.5 threads per inch, pipe OD 42.164 mm.

Documents

• CC-ASTMA733-DS-NPS1.pdf: 1 datasheet: values with levels, lengths, sources
• CC-ASTMA733-SZ-1.pdf: 1 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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