Threaded Bull's Eye Sights

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UN/UNF (SAE Straight)

Material

Window Diameter

For Use With

Hydraulic Fluid (Petroleum Based)

Oil

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Maximum Pressure @ Temperature

For Liquid Appearance

Hex Size

Maximum Temperature

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Window Material

Minimum Temperature

Seal Material

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

RoHS

Compliant

Compliant with Exemptions

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REACH

Compliant

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DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Performance

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Reservoir Capacity

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Maximum Torque

172 Products

Sights

These sights have a glass window. Screw them into threaded holes on tanks, gear cases, bearing housings, and mixers to see inside.

Brass with Glass Window


BSPP Thread, For Clear Liquids	BSPP Thread For Dark Liquids	NPTF Thread, For Clear Liquids	NPTF Thread For Dark Liquids

BSPP Thread—Sights with BSPP (British Standard Pipe Parallel) threads are often used with imported equipment.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

								For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each		Each
NPTF Male



		1/4	1/4"	5/8"	150 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K21	000000	———	0


		1/4	1/4"	5/8"	675 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K71	00000	———	0
		3/8	3/8"	3/4"	100 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K22	0000	1210K32	00000
		3/8	3/8"	3/4"	415 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K72	00000	1322K82	00000
		1/2	1/2"	7/8"	100 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K23	0000	1210K33	00000
		1/2	1/2"	7/8"	250 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K73	00000	1322K83	00000
		3/4	3/4"	1 1/8"	60 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K24	00000	1210K34	00000
		3/4	3/4"	1 1/8"	200 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K74	00000	1322K84	00000
		1	1"	1 3/8"	60 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K25	00000	1210K31	00000
		1	1"	1 3/8"	100 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K75	00000	1322K85	00000
		1 1/4	1 1/8"	1 3/4"	25 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K26	00000	1210K36	00000


		1 1/4	1 1/8"	1 3/4"	60 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K76	00000	1322K86	00000
		1 1/2	1 3/8"	2"	25 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K27	00000	1210K37	00000
		1 1/2	1 3/8"	2"	50 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K77	00000	1322K87	00000
		2	1 7/8"	2 1/2"	10 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1210K28	00000	1210K38	00000
		2	1 7/8"	2 1/2"	20 psi @ 70° F	-40 to 180	Water, Hydraulic Fluid (Petroleum Based)	Buna-N	1322K78	000000	1322K88	000000


		BSPP Male



				3/8	3/8"	3/4"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T2	00000	6395T1	00000


				1/2	1/2"	7/8"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T4	00000	6395T3	00000
				3/4	5/8"	1 1/8"	360 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T6	00000	6395T5	00000
				1	1"	1 3/8"	290 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6395T8	00000	6395T7	00000

Steel with Glass Window


NPT Thread, For Clear Liquids	NPT Thread For Dark Liquids	NPTF Thread, For Clear Liquids	NPTF Thread For Dark Liquids

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

							For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each		Each
NPT Male







				With Fused Window

				1/2	1/2"	15/16"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K14	00000	3277K34	000000


				1	1"	1 3/8"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K18	00000	3277K38	00000
				1 1/4	1 1/4"	1 3/4"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K23	00000	3277K43	00000
				1 1/2	1 1/2"	2"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K25	00000	3277K45	00000
				2	2"	2 1/2"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K27	00000	3277K47	00000


				NPTF Male







								With Fused Window

								3/8	3/8"	3/4"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K12	00000	3277K32	00000


								3/4	3/4"	1 1/16"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	3277K16	00000	3277K36	00000

Aluminum with Glass Window


BSPP Thread, For Clear Liquids	BSPP Thread For Dark Liquids

Aluminum sights have good corrosion resistance.

BSPP Thread—Sights with BSPP (British Standard Pipe Parallel) threads are often used with imported equipment.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

								For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each		Each
BSPP Male



		3/8	3/8"	3/4"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K11	000000	3434K32	000000


		1/2	1/2"	7/8"	725 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K13	00000	3434K33	00000
		3/4	5/8"	1 1/8"	360 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K15	00000	3434K35	00000
		1	1"	1 3/8"	290 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K17	00000	3434K37	00000
		1 1/4	1 1/4"	1 3/4"	180 psi @ 70° F	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3434K19	00000	3434K39	00000

303 Stainless Steel with Glass Window


BSPP Thread For Dark Liquids	BSPP Thread For Dark Liquids	NPT Thread, For Clear Liquids	NPT Thread For Dark Liquids

303 stainless steel sights are more corrosion resistant than brass, steel, and aluminum sights.

BSPP Thread—Sights with BSPP (British Standard Pipe Parallel) threads are often used with imported equipment.

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

								For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each		Each
NPT Male



		1/4	1/4"	5/8"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T11	000000	———	0


		3/8	3/8"	3/4"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T12	00000	6490T19	000000
		1/2	5/8"	1"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T13	00000	6490T21	00000
		3/4	3/4"	1"	125 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T14	00000	6490T22	00000
		1	1"	1 3/8"	100 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T15	00000	6490T23	00000
		1 1/4	1 1/4"	1 3/4"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T16	00000	6490T24	00000
		1 1/2	1 1/2"	2"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T17	00000	6490T25	00000
		2	2"	2 1/2"	50 psi @ 70° F	0 to 225	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	6490T18	000000	6490T26	000000


		BSPP Male



				3/8	3/8"	3/4"	725 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T1	00000	6396T31	00000


				1/2	1/2"	7/8"	725 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T2	00000	6396T32	00000
				3/4	5/8"	1 1/8"	360 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T3	00000	6396T33	00000
				1	1"	1 3/8"	290 psi @ 70° F	0 to 350	Water, Hydraulic Fluid, Diesel Fuel	Fluoroelastomer	6396T4	00000	6396T34	00000

High-Pressure Sights

With a thick glass window fused to a metal body, these sights resist cracking at high pressures.

Nickel-Plated Steel with Glass Window


NPT Thread, For Clear Liquids	NPT Thread For Dark Liquids

For Dark Liquids—Sights for dark liquid have a reflector that makes liquid easy to see, especially in low-light conditions.

							For Clear Liquids		For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each		Each
NPT Male







				With Fused Window

				1/4	3/8"	5/8"	2,000 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K18	000000	———	0


				3/8	3/8"	3/4"	1,850 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K11	00000	1079K41	000000
				1/2	1/2"	15/16"	1,750 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K12	00000	1079K42	00000
				3/4	3/4"	1 1/16"	1,500 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K13	00000	1079K43	00000
				1	1"	1 3/8"	1,250 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K14	00000	1079K44	00000
				1 1/4	1 1/8"	1 3/4"	1,000 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K15	00000	1079K45	00000
				1 1/2	1 3/8"	2"	750 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K16	00000	1079K46	00000
				2	1 7/8"	2 1/2"	500 psi @ 70° F	-40 to 500	Water, Hydraulic Fluid, Diesel Fuel	1079K17	00000	1079K47	00000

2205 Stainless Steel with Glass Window

NPT Thread, For

Clear Liquids

2205 stainless steel sights are more corrosion resistant than nickel-plated steel sights.

							For Clear Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each
NPT Male







				With Fused Window

				1/4	3/8"	13/16"	1,400 psi @ 70° F	-20 to 536	Water, Hydraulic Fluid, Diesel Fuel	5207K47	0000000


				1/2	1/2"	1 1/16"	1,400 psi @ 70° F	-20 to 536	Water, Hydraulic Fluid, Diesel Fuel	5207K42	000000
				3/4	3/4"	1 7/16"	1,400 psi @ 70° F	-20 to 536	Water, Hydraulic Fluid, Diesel Fuel	5207K43	000000
				1	7/8"	1 5/8"	1,400 psi @ 70° F	-20 to 536	Water, Hydraulic Fluid, Diesel Fuel	5207K44	000000
				1 1/2	1 1/8"	2 3/16"	1,400 psi @ 70° F	-20 to 536	Water, Hydraulic Fluid, Diesel Fuel	5207K49	000000
				2	1 3/8"	2 3/4"	1,400 psi @ 70° F	-20 to 536	Water, Hydraulic Fluid, Diesel Fuel	5207K46	000000

Shatter-Resistant Sights

The window and body are made from a single piece of plastic, making these sights more shatter resistant than sights with a glass window. They are not rated for pressure.

Plastic with Plastic Window

Image of Product. Front orientation. Sights. Shatter-Resistant Sights.

	Pipe Size	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each
NPT Male







		With One-Piece Construction

		1/2	—	1/2"	1"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K11	00000


		3/4	—	5/8"	1 1/4"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K12	0000
		1	—	7/8"	1 1/2"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K13	00000


		BSPP Male







						With One-Piece Construction

						1/4	—	3/8"	5/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K31	0000


						3/8	—	3/8"	3/4"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K32	0000
						1/2	—	1/2"	7/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K33	0000
						3/4	—	3/4"	1"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K34	0000
						1	—	1"	1 3/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K35	0000
						1 1/4	—	1 1/8"	1 5/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K36	00000


						Metric Male







										With One-Piece Construction

										—	M16 × 1.5 mm	7/16"	3/4"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K111	0000


										—	M20 × 1.5 mm	9/16"	7/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K112	0000
										—	M25 × 1.5 mm	11/16"	1 1/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K113	0000
										—	M27 × 1.5 mm	13/16"	1 1/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K114	0000
										—	M30 × 1.5 mm	7/8"	1 3/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K115	0000
										—	M40 × 1.5 mm	1 3/16"	1 5/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K116	00000


										UN/UNF (SAE Straight) Male







With One-Piece Construction

—	3/4"-16													1/2"	7/8"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K117	0000


—	1 1/16"-12													3/4"	1 3/16"	Not Rated	-20 to 210	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	5095K118	00000

Easy-View Sights

View tank contents from multiple angles through the plastic domed window.

Zinc-Plated Steel with Plastic Window

Zinc-plated steel sights have a shatter-resistant window.

	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each
NPT Male



	3/4	1"	1 1/4"	10 psi @ 70° F	0 to 160	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	1128K3	000000


	1	1"	1 1/2"	10 psi @ 70° F	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K4	00000
	1 1/4	1 1/4"	1 7/8"	10 psi @ 70° F	0 to 160	Water, Hydraulic Fluid, Diesel Fuel	Neoprene	1128K5	00000
	1 1/2	1 5/8"	2 1/8"	10 psi @ 70° F	0 to 160	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	1128K6	00000

Plastic with Plastic Window

Plastic sights have an impact-resistant window and brass threads.

	Window Dia.	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each
NPT Male



	1/4	3/8"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T21	000000


	3/8	1/2"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T22	00000

Easy-View All-Plastic Sights

Machined from one piece of stain- and impact-resistant plastic. They have a domed window so you can view tank contents from multiple angles.

Plastic with Plastic Window

	Temp. Range, ° F	For Use With		Each
NPT Male







	With One-Piece Construction

	1/2	7/8"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T23	000000


	3/4	1 1/8"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T24	00000
	1	1 3/8"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T25	00000
	1 1/4	1 3/4"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T26	00000
	1 1/2	2"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T27	00000
	2	2 1/2"	65 psi @ 70° F	-40 to 180	Hydraulic Fluid	6406T28	00000

High-Visibility Sights

Easily view liquid movement and level changes from a distance—these sights have an indicator ball inside the glass window. They also have a reflector that makes dark liquid easy to see, especially in low-light conditions.

Brass with Glass Window

Image of Product. Front orientation. Sights. High-Visibility Sights.

Brass sights have good corrosion resistance.

								For Dark Liquids
	Pipe Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material		Each
NPTF Male







				With Indicator Ball

				3/8	7/16"	3/4"	100 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K71	000000


				3/8	7/16"	3/4"	415 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K78	00000
				1/2	9/16"	7/8"	100 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K72	00000
				1/2	9/16"	7/8"	250 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K79	00000
				3/4	3/4"	1 1/8"	60 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K73	00000
				3/4	3/4"	1 1/8"	200 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K81	00000
				1	15/16"	1 7/16"	60 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K74	00000
				1	15/16"	1 7/16"	100 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K82	00000
				1 1/4	1 1/8"	1 3/4"	60 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K83	00000
				1 1/4	1 3/16"	1 3/4"	25 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K75	00000
				1 1/2	1 3/8"	2"	50 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K84	00000


				1 1/2	1 7/16"	2"	25 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K76	00000
				2	1 7/8"	2 1/2"	10 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K77	000000
				2	1 7/8"	2 1/2"	20 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	3277K85	000000

Steel with Glass Window

UN/UNF (SAE Straight) Thread—UN/UNF (SAE Straight) threads are also known as O-ring boss threads.

										For Dark Liquids
	Pipe Size	Thread Size	Window Dia.	Hex Size	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With	Seal Material	Specs. Met		Each
NPT Male







				With Fused Window and Indicator Ball

				1/2	—	1/2"	1"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K54	000000


				1	—	1"	1 3/8"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K58	00000
				1 1/4	—	1 1/4"	1 3/4"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K63	00000
				1 1/2	—	1 1/2"	2"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K65	00000
				2	—	2"	2 1/2"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K67	00000


				NPTF Male







								With Fused Window and Indicator Ball

								3/8	—	3/8"	3/4"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K52	00000


								3/4	—	3/4"	1"	125 psi @ 70° F	-40 to 250	Water, Hydraulic Fluid, Diesel Fuel	—	—	3277K56	00000


								UN/UNF (SAE Straight) Male







												With Indicator Ball

												—	3/4"-16	9/16"	7/8"	75 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K87	00000


												—	1 1/16"-12	3/4"	1 1/4"	75 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K88	00000
												—	1 5/16"-12	15/16"	1 1/2"	75 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K89	00000
												—	1 7/8"-12	1 7/16"	2"	20 psi @ 70° F	-40 to 180	Water, Diesel Fuel, Hydraulic Fluid (Petroleum Based)	Buna-N	SAE J1926/3	3277K91	00000

High-Temperature Sights

Often used in kilns and other heating equipment, these sights have a quartz window that can withstand temperatures up to 1600° F. They're also known as peep sights.

		Window				Temperature Range
	Pipe Size	Dia.	Material	Hex Size	Max. Pressure @ Temp.	Min.	Max., ° F	For Use With		Each
316 Stainless Steel







				NPT Male

				1/2	5/16"	Quartz	1"	150 psi @ 1,600° F	Not Rated	1,600	Water, Air, Steam	4791K61	0000000


				3/4	9/16"	Quartz	1 3/8"	150 psi @ 1,600° F	Not Rated	1,600	Water, Air, Steam	4791K62	000000
				1	11/16"	Quartz	1 5/8"	150 psi @ 1,600° F	Not Rated	1,600	Water, Air, Steam	4791K63	000000
				1 1/4	1 1/16"	Quartz	2"	150 psi @ 1,600° F	Not Rated	1,600	Water, Air, Steam	4791K64	000000
				1 1/2	1 1/4"	Quartz	2 1/4"	150 psi @ 1,600° F	Not Rated	1,600	Water, Air, Steam	4791K65	000000
				2	1 1/2"	Quartz	2 3/4"	150 psi @ 1,600° F	Not Rated	1,600	Water, Air, Steam	4791K66	000000

Sights for Oil Inspection

Continuously monitor oil quality through the clear plastic reservoir and use the attached drain valve to remove water accumulation. Sights can be mounted vertically or horizontally. To mount vertically, install through a port on the bottom of your tank. There must be enough clearance for the sight to fit below the tank base. In areas with limited space under equipment, install one of these sights horizontally through a port on the side of your tank.

Brass with Plastic Window

	Max. Pressure @ Temp.	Temp. Range, ° F	For Use With		Each
NPT Male







	With Drain Valve

	1/4	1 3/4"	1	65 psi @ 70° F	30 to 180	Oil	5729T81	000000


	1/4	2 1/2"	3	65 psi @ 70° F	30 to 180	Oil	5729T84	00000
	3/8	1 3/4"	1	65 psi @ 70° F	30 to 180	Oil	5729T82	00000
	3/8	2 1/2"	3	65 psi @ 70° F	30 to 180	Oil	5729T85	00000
	1/2	1 3/4"	1	65 psi @ 70° F	30 to 180	Oil	5729T83	00000
	1/2	2 1/2"	3	65 psi @ 70° F	30 to 180	Oil	5729T86	00000