NPS 1-1/4 Pipe Nipple, ASTM A733

The NPS 1-1/4 pipe nipple (ASTM A733) joins two NPS 1-1/4 NPT fittings: Schedule 40 pipe 42.164 mm across with a 3.556 mm wall, threaded 11.5 threads per inch at both ends. It comes in 16 lengths from 41.275 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 1-1/4 pipe nipple, NPS 1-1/4 x 41.275 to NPS 1-1/4 x 304.8 pipe nipples
• Model id: astm-a733-nps1-1-4
• Standard: ASTM A733 · NPS 1-1/4, 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
41.275	astm-a733-nps1-1-4x41-275	STEP	STEP
50.8	astm-a733-nps1-1-4x50-8	STEP	STEP
63.5	astm-a733-nps1-1-4x63-5	STEP	STEP
76.2	astm-a733-nps1-1-4x76-2	STEP	STEP
88.9	astm-a733-nps1-1-4x88-9	STEP	STEP
101.6	astm-a733-nps1-1-4x101-6	STEP	STEP
114.3	astm-a733-nps1-1-4x114-3	STEP	STEP
127	astm-a733-nps1-1-4x127	STEP	STEP
139.7	astm-a733-nps1-1-4x139-7	STEP	STEP
152.4	astm-a733-nps1-1-4x152-4	STEP	STEP
177.8	astm-a733-nps1-1-4x177-8	STEP	STEP
203.2	astm-a733-nps1-1-4x203-2	STEP	STEP
228.6	astm-a733-nps1-1-4x228-6	STEP	STEP
254	astm-a733-nps1-1-4x254	STEP	STEP
279.4	astm-a733-nps1-1-4x279-4	STEP	STEP
304.8	astm-a733-nps1-1-4x304-8	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
l_close_in	Close nipple length, inches		1.625		1.625	nominal	L1
l_close	Close nipple length		41.275		41.275	nominal	L1
D	Outside diameter		42.164		42.164	nominal	L1
T	Wall thickness		3.556		3.556	nominal	L1
D_in	Outside diameter, inches		1.66		1.66	nominal	L1
T_in	Wall thickness, inches		0.14		0.14	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		1.66		1.66	nominal	L1
E0	Pitch diameter at the small end		1.55713		1.55713	nominal	L1
L1	Hand-tight engagement length		0.42		0.42	nominal	L1
E1	Pitch diameter at the hand-tight plane		1.58338		1.58338	nominal	L1
L2	Effective thread length		0.7068		0.7068	nominal	L1
E2	Pitch diameter at the end of the effective thread		1.6013		1.6013	nominal	L1
L4	Overall length of external thread		1.0085		1.0085	nominal	L1
h	Height of thread		0.06957		0.06957	nominal	L1
K0	Basic minor diameter at the small end		1.4876		1.4876	nominal	L1
alpha	Flank angle		60		60	nominal	L1
taper	Taper		16		16	nominal	L1

Drawing

As a PDF: CC-ASTMA733-SZ-1-1-4.pdf.

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

The NPS 1-1/4 is number 7 of the 9 ASTM A733 pipe nipples published here, listed from NPS 1/8 to NPS 2.

• Close nipple length, inches (l_close_in): 1.625 mm on the NPS 1-1/4 pipe nipple, against 1.5 mm on the NPS 1 and 1.75 mm on the NPS 1-1/2.
• Close nipple length (l_close): 41.275 mm on the NPS 1-1/4 pipe nipple, against 38.1 mm on the NPS 1 and 44.45 mm on the NPS 1-1/2.
• Outside diameter (D): 42.164 mm on the NPS 1-1/4 pipe nipple, against 33.401 mm on the NPS 1 and 48.26 mm on the NPS 1-1/2.
• Wall thickness (T): 3.556 mm on the NPS 1-1/4 pipe nipple, against 3.3782 mm on the NPS 1 and 3.683 mm on the NPS 1-1/2.
• Outside diameter, inches (D_in): 1.66 mm on the NPS 1-1/4 pipe nipple, against 1.315 mm on the NPS 1 and 1.9 mm on the NPS 1-1/2.
• Wall thickness, inches (T_in): 0.14 mm on the NPS 1-1/4 pipe nipple, against 0.133 mm on the NPS 1 and 0.145 mm on the NPS 1-1/2.
• Threads per inch (n): 11.5 mm on the NPS 1-1/4 pipe nipple, the same on the NPS 1 and the NPS 1-1/2.
• Pitch (P): 0.08695652 mm on the NPS 1-1/4 pipe nipple, the same on the NPS 1 and the NPS 1-1/2.

Other sizes

• One size smaller: NPS 1 Pipe Nipple, ASTM A733, 11.5 threads per inch, pipe OD 33.401 mm.
• One size larger: NPS 1-1/2 Pipe Nipple, ASTM A733, 11.5 threads per inch, pipe OD 48.26 mm.

Documents

• CC-ASTMA733-DS-NPS1-1-4.pdf: 1-1/4 datasheet: values with levels, lengths, sources
• CC-ASTMA733-SZ-1-1-4.pdf: 1-1/4 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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