GrandMfg®Coolant sight glass,bulls eye sight glasses,oil sight plugs

GrandMfg® liquid or oil sight glass window Ölschauglas plugs

GrandMfg® sight glasses allowed directly to see the liquid or oil within industrial pipes systems,tanks, and vessels etc. These sights have a glass window. Screw them into threaded holes on tanks, gear cases,gear unit, bearing housings, blower,pump and mixers to see inside liquid level.

Custom safety sight glasses can be designed to meet your exact specifications with different thread size and thread type. No thread for press fitting or welding is also no problem.

Application:Pump,Receivers,Tanks,Gearbox,Speed reducer,Worm gearbox, helical gear boxes, variable speed motor, automotive Worm gearboxes,Compressor,blower,Gear unit and Power Transmession.

Advantages of our Sight Glass:

1）Tempered Glass is better than a polypropylene glass

Withstand higher temperature and never age and color change.

Natural glass Will not be corroded and will not chemically react with various oils and various liquids.So our sight glass an have the same life time with your requirements even more long life time than the equipment.

2）Max dimensions of sight window of each size.

We design all of our sight glasses to have a max sight window for viewing.It is very important for you to see clear inside especially when choose the small size.

3）Different metal material body of sight glass

Metal body is more stronger and better metal perform to meet different working condition.Customer can choose the right metal sight glass for their application.

A) Brass HPb57-3 or other brass free of lead.

B) Aluminum 6061-T6

C) Stainless steel 304 /316

D)Steel plated(Zinc plated,Nickel plated or chrome plated)

4）Stainless steel 304 Reflector / the same material of the body as a whole.

It is easy to see the color of oil or liquid and view the level of liquid inside of the the housing of the equipments. Stainless steel 304 reflector have a prefect function in corrosion resistant, never age and color change.

5)Ball indicator inside of our sight glass.

Ball indicator for easier viewing at a distance and the liquid level of the sight glass.We will offer different color ball to meet your liquid color. Make sure the liquid inside is easy to view even in a dark light.

Brass Oil Sight Glass(BSP Metric Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	F(mm)	SW(mm)	Max MPa/Temperateru
GM-BM10	M10	M10x1	7	7	14	15	5	13	Metric and BSP Thread DIN3869-ED Gaskets for Sealing. 1MPa / Below Zero 30 to 120 Centigrade((FKM/Viton to 180 Centigrade)
GM-BM16	M16	M16x1.5	7.5	7	14.5	22	10	19
GM-BM20	M20	M20x1.5	8	7	15	26	14	23
GM-BM22	M22	M22x1.5	8	8	16	28	15	24
GM-BM26	M26	M26x1.5	9	9	18	31	20	26
GM-BM27	M27	M27x1.5	9	9	18	32	20	26
GM-BM30	M30	M30x1.5	10	9	19	37	22	33
GM-BM33	M33	M33x1.5	11	9	20	40	24	36
GM-BM42	M42	M42x1.5	12	10	22	52	31	46
GM-BM60	M60	M60x2	13.5	10.5	24	71	46	62

GM-BG38	3/8"	G 3/8"	7.5	7	14.5	22	10	19
GM-BG12	1/2"	G 1/2"	8	7	15	26	14	23
GM-BG34	3/4"	G 3/4"	9	9	18	32	20	26
GM-BG10	1"	G 1"	11	9	20	40	24	36
GM-BG114	1-1/4"	G1-1/4"	12	9	21	50	35	42
GM-BG112	1-1/2"	G1-1/2"	13	10	23	56	39	48
GM-BG200	2"	G 2"	13	10	23	70	48	60

Aluminum Oil Sight Glass(Metric & BSP Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	F(mm)	SW(mm)	Max MPa/Temperateru
GM-AM10	M10	M10x1	7	7	14	15	5	13	Metric and BSP Thread DIN3869-ED Gaskets for Sealing. 1MPa / Below Zero 30 to 120 Centigrade((FKM/Viton to 180 Centigrade)
GM-AM16	M16	M16x1.5	7.5	7	14.5	22	10	19
GM-AM20	M20	M20x1.5	8	7	15	26	14	23
GM-AM22	M22	M22x1.5	8	8	16	28	15	24
GM-AM26	M26	M26x1.5	9	9	18	31	20	26
GM-AM27	M27	M27x1.5	9	9	18	32	20	26
GM-AM30	M30	M30x1.5	10	9	19	37	22	33
GM-AM33	M33	M33x1.5	11	9	20	40	24	36
GM-AM42	M42	M42x1.5	12	10	22	52	31	46
GM-AM60	M60	M60x2	13.5	10.5	24	71	46	62

GM-AG38	3/8"	G 3/8"	7.5	7	14.5	22	10	19
GM-AG12	1/2"	G 1/2"	8	7	15	26	14	23
GM-AG34	3/4"	G 3/4"	9	9	18	32	20	26
GM-AG10	1"	G 1"	11	9	20	40	24	36
GM-AG114	1-1/4"	G1-1/4"	12	9	21	50	35	42
GM-AG112	1-1/2"	G1-1/2"	13	10	23	56	39	48
GM-AG200	2"	G 2"	13	10	23	70	48	60

Hexagon Brass Oil Sight Glass(BSP & Metric Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-BHM10	M10	M10x1	7	7	14	5	14	1MPa	Metric and BSP Thread DIN3869-ED Gaskets for Sealing. Below Zero 30 to 120 Centigrade((FKM/Viton to 180 Centigrade)
GM-BHM16	M16	M16x1.5	7	7	14	10	22
GM-BHM20	M20	M20x1.5	8	7	15	16	26
GM-BHM22	M22	M22x1.5	8	7	15	17	28
GM-BHM26	M26	M26x1.5	9	8	17	20	33
GM-BHM27	M27	M27x1.5	9	8	17	20	33
GM-BHM30	M30	M30x1.5	10	9	19	23	36
GM-BHM33	M33	M33x1.5	11	10	22	25	40
GM-BHM42	M42	M42x1.5	12	10	22	31	52
GM-BHM60	M60	M60x2	13	10	23	46	71

GM-BHG38	3/8"	G 3/8"	7	7	14	10	22
GM-BHG12	1/2"	G 1/2"	8	7	15	16	26
GM-BHG34	3/4"	G 3/4"	9	8	17	20	33
GM-BHG10	1"	G 1"	12	10	22	25	40
GM-BHG114	1-1/4"	G1-1/4"	14	10	24	35	50
GM-BHG112	1-1/2"	G1-1/2"	14	11	25	39	55
GM-BHG200	2"	G2"	14	12	26	48	71

Hexagon Aluminum Oil Level Sight Glass(BSP & Metric Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-AHM10	M10	M10x1	7	7	14	5	14	1MPa	Metric and BSP Thread DIN3869-ED Gaskets for Sealing. Below Zero 30 to 120 Centigrade((FKM/Viton to 180 Centigrade)
GM-AHM16	M16	M16x1.5	7	7	14	10	22
GM-AHM20	M20	M20x1.5	8	7	15	16	26
GM-AHM22	M22	M22x1.5	8	7	15	17	28
GM-AHM26	M26	M26x1.5	9	8	17	20	33
GM-AHM27	M27	M27x1.5	9	8	17	20	33
GM-AHM30	M30	M30x1.5	10	9	19	23	36
GM-AHM33	M33	M33x1.5	12	10	22	25	40
GM-AHM42	M42	M42x1.5	12	10	22	31	52
GM-AHM60	M62	M60x2	12	10	23	46	71

GM-AHG38	3/8"	G 3/8"	7	7	14	10	22
GM-AHG12	1/2"	G 1/2"	8	7	15	16	26
GM-AHG34	3/4"	G 3/4"	9	8	17	20	33
GM-AHG10	1"	G 1"	12	10	22	25	40
GM-AHG114	1-1/4"	G1-1/4"	14	10	24	35	50
GM-AHG112	1-1/2"	G1-1/2"	14	11	25	39	55
GM-AHG20	2"	G2"	14	12	26	48	71

Hexagon Steel Oil Sight Glass Zinc Plated (Metric & BSP)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-SM10	M10	M10x1	7	7	14	5	14	1MPa	Metric and BSP Thread DIN3869-ED Gaskets for Sealing. Below Zero 30 to 120 Centigrade((FKM/Viton to 180 Centigrade)
GM-SM16	M16	M16x1.5	7	7	14	10	22
GM-SM20	M20	M20x1.5	8	7	15	16	26
GM-SM22	M22	M22x1.5	8	7	15	17	28
GM-SM26	M26	M26x1.5	9	8	17	20	33
GM-SM27	M27	M27x1.5	9	8	17	20	33
GM-SM30	M30	M30x1.5	10	9	19	23	36
GM-SM33	M33	M33x1.5	12	10	22	25	40
GM-SM42	M42	M42x1.5	12	10	22	31	52
GM-SM60	M60	M60X2	13	10	23	46	71

GM-SG38	3/8"	G 3/8"	7	7	14	10	22
GM-SG12	1/2"	G 1/2"	8	7	15	16	26
GM-SG34	3/4"	G 3/4"	9	8	17	20	33
GM-SG10	1"	G1"	12	10	22	25	40
GM-SG114	1-1/4"	G1-1/4"	14	10	24	35	50
GM-SG112	1-1/2"	G1-1/2"	14	11	25	39	55
GM-SG20	2"	G 2"	14	12	26	48	71

Circular Brass Oil Sight Glass With Relfector (Metric & BSP)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	F(mm)	H(mm)	Max MPa/Temperateru
GM-CBM16	M16	M16x1.5	2.6	4	8	9	15	22	1MPa / Below Zero 30 to 120 Centigrade ((FKM/Viton to 180 Centigrade)
GM-CBM18	M18	M18x1.5	2.6	4	8	9	15	22
GM-CBM20	M20	M20x1.5	2.6	4	8	11.5	17.5	26
GM-CBM22	M22	M22x1.5	2.6	4	8	11.5	17.5	26
GM-CBM24	M24	M24x1.5	2.6	4	8	16	22	30
GM-CBM26	M26	M26x1.5	2.6	4	8	16	22	32
GM-CBM27	M27	M27x1.5	2.6	4	8	16	22	32
GM-CBM30	M30	M30x1.5	2.6	4.5	8.5	20	26	36
GM-CBM30D	M30	M30x2	2.6	4.5	8.5	20	26	36
GM-CBM33	M33	M33x1.5	2.6	4.5	9	22	28	38
GM-CBM33D	M33	M33x2	2.6	4.5	9	22	28	38
GM-CBM35	M35	M35x1.5	2.6	4.5	9	25	31	42
GM-CBM36	M36	M36x1.5	2.6	4.5	9	25	31	42	The glass can make red marking.The reflector can paint white
GM-CBM42	M42	M42x1.5	3.2	4.5	10	28	34	48
GM-CBM48	M48	M48x1.5	3.2	5	11	33	39	55
GM-CBM60	M60	M60x2	4.5	5.5	11	43	49	69

GM-CBG38	3/8"	G 3/8"	2.6	4	8	9	15	22
GM-CBG12	1/2"	G 1/2"	2.6	4	8	11.5	17.5	26
GM-CBG34	3/4"	G 3/4"	2.6	4	8	16	22	32
GM-CBG100	1"	G 1"	2.6	4.5	9	22	28	38
GM-CBG114	1 1/4"	G 1 1/4"	3.2	4.5	10	28	36	48
GM-CBG112	1 1/2"	G 1 1/2"	3.2	5	11	33	39	55
GM-CBG200	2"	G 2"	4.5	5.5	11	43	49	69

Hexagon Stainless Steel Oil Sight Glass(Metric thread,BSP & NPT)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-SSM10	M10	M10x1	7	7	14	5	14	1MPa	Below Zero 30 to 120 Centigrade ((FKM/Viton to 180 Centigrade)
GM-SSM16	M16	M16x1.5	7	7	14	10	22
GM-SSM20	M20	M20x1.5	8	7	15	16	26
GM-SSM22	M22	M22x1.5	8	7	15	17	28
GM-SSM26	M26	M26x1.5	9	8	17	20	33
GM-SSM27	M27	M27x1.5	9	8	17	20	33
GM-SSM30	M30	M30x1.5	10	9	19	23	36
GM-SSM33	M33	M33x1.5	12	10	22	25	40

GM-SSG38	3/8"	G 3/8"	7	7	14	10	22	1MPa	Below Zero 30 to 120 Centigrade ((FKM/Viton to 180 Centigrade)
GM-SSG12	1/2"	G 1/2"	8	7	15	16	26
GM-SSG34	3/4"	G 3/4"	9	8	17	20	33
GM-SSG10	1"	G 1"	12	10	22	25	40
GM-SSG114	1-1/4"	G1-1/4"	14	10	24	35	50

GM-SS38	3/8"	NPT 3/8"	16	11	27	11	19	1MPa	Below Zero 30 to 120 Centigrade ((FKM/Viton to 180 Centigrade)
GM-SS12	1/2"	NPT 1/2"	16.5	11.5	28	13	24
GM-SS34	3/4"	NPT 3/4"	17	12	29	19	28
GM-SN10	1"	NPT 1"	20	12	32	25	35
GM-SSU116	1 1/16"	1 1/16-12 UN	15	12	27	19	31

Hexagon Brass Oil Sight glass (NPT Thread)
Item No.	Size(mm)	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-BN38	3/8"	NPT 3/8"	16	11	27	11	19	1MPa	Below Zero 30 to 120 Centigrade ((FKM/Viton to 180 Centigrade)
GM-BN12	1/2"	NPT 1/2"	16.5	11.5	28	13	24
GM-BN34	3/4"	NPT 3/4"	17	12	29	19	28
GM-BN10	1"	NPT 1"	20	12	32	25	35
GM-BN114	1-1/4"	NPT1-1/4"	20	12	32	35	48
GM-BN112	1-1/2"	NPT1-1/2"	22	13	35	39	56
GM-BN20	2"	NPT 2"	23	13	36	48	66

Hexagon Steel Oil Sight Glass Zinc Plated (NPT Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-SN38	3/8"	NPT 3/8"	16	11	27	11	19	1MPa	Below Zero 30 to 120 Centigrade ((FKM/Viton to 180 Centigrade)
GM-SN12	1/2"	NPT 1/2"	16.5	11.5	28	13	24
GM-SN34	3/4"	NPT 3/4"	17	12	29	19	28
GM-SN10	1"	NPT 1"	20	12	32	25	35
GM-SN114	1-1/4"	NPT1-1/4"	20	12	32	35	48
GM-SN112	1-1/2"	NPT1-1/2"	22	13	35	39	56
GM-SN20	2"	NPT 2"	23	13	36	48	66
GM-SU116	1 1/16"	1 1/16"-12 UNF	15	12	27	19	31

Domed Hexagon Oil Sight Glass with locking nut (NPT,BSP & Metric Thread)
Item No.	Size(mm)	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	F(mm)	SW(mm)	Temperature
GM-HDN14	1/4"	NPT 1/4"	12	16	9	12	10	21	Metric and BSP Thread DIN38-ED Gaskets for Sealing.With Borosilicate Glass Below Zero 25 to 200 Centigrade
GM-HDN38	3/8"	NPT 3/8"	13	16	11	16	13	24
GM-HDN12	1/2"	NPT 1/2"	14	16	13	18	13	26
GM-HDN34	3/4"	NPT 3/4"	17	16	20	25	15	36
GM-HDN10	1"	NPT 1"	20	16	25	30	15	40
GM-HDG14	1/4"	G1/4"	12	16	9	12	10	21
GM-HDG38	3/8"	G3/8"	10	16	11	16	13	24
GM-HDG12	1/2"	G1/2"	10	16	13	18	13	26
GM-HDG34	3/4"	G3/4"	12	16	20	25	15	36
GM-HDG10	1"	G1"	12	16	25	30	15	40
GM-HDM12	M12	M12x1	10	16	9	12	10	21
GM-HDM12	M12	M12x1.5	10	16	9	12	10	21
GM-HDM14	M14	M14x1.5	10	16	9	12	10	21
GM-HDM16	M16	M16x1.5	10	16	11	16	13	24
GM-HDM20	M20	M20x1.5	10	16	12	18	13	26
GM-HDM22	M22	M22x1.5	10	16	13	18	13	26
GM-HDM26	M26	M26x1.5	11	16	19	25	14	36
GM-HDM27	M27	M27x1.5	11	16	20	25	15	36
GM-HDM33	M33	M33x1.5	11	16	25	30	15	40

Cheap Aluminum Oil Sight Glass With Plastic Glass (Metric & BSP)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	SW(mm)	Max Mpa	Temperature
GM-ACM10	M10	M10x1	7	7	14	5	14	0.4MPa	Below Zero 20 to 80 Centigrade
GM-ACM16	M16	M16x1.5	7	7	14	10	22
GM-ACM20	M20	M20x1.5	8	7	15	16	26
GM-ACM22	M22	M22x1.5	8	7	15	17	28
GM-ACM26	M26	M26x1.5	9	8	17	20	33
GM-ACM27	M27	M27x1.5	9	8	17	20	33
GM-ACM30	M30	M30x1.5	10	9	19	23	36
GM-ACM33	M33	M33x1.5	12	10	22	25	40

GM-ACG38	3/8"	G 3/8"	7	7	14	10	22
GM-ACG12	1/2"	G 1/2"	8	7	15	16	26
GM-ACG34	3/4"	G 3/4"	9	8	17	20	33
GM-ACG10	1"	G 1"	12	10	22	25	40

Plastic Oil Sight Glass(BSP & Metric Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	F(mm)	SW(mm)	Max MPa/Temperateru
GM-PM16	M16	M16x1.5	7	9	16	14	22	17	0.4MPa / Below Zero 20 to 70 Centigrade
GM-PM18	M16	M18x1.5	8	9	17	15	25	22
GM-PM20	M20	M20x1.5	8	9	17	16	27	24
GM-PM22	M22	M22x1.5	8	9	17	18	27	24
GM-PM24	M24	M24x1.5	9	9	18	19	31	27
GM-PM26	M26	M26x1.5	9	9	18	20	31	27
GM-PM27	M27	M27x1.5	9	9	18	22	36	31
GM-PM30	M30	M30x1.5	10	9	19	24	36	32
GM-PM33	M33	M33x1.5	11	8	19	26	41	36
GM-PM36	M36	M36x1.5	11	11	22	28	46	41
GM-PM42	M42	M42x1.5	12	12	24	38	52	46
GM-PM60	M60	M60x2.0	12	16	28	54	71	62

GM-PG38	G3/8"	G3/8"	7	9	16	14	22	17
GM-PG12	G1/2"	G1/2"	8	9	17	18	27	24
GM-PG34	G3/4"	G3/4"	9	9	18	22	36	31
GM-PG10	G1"	G1"	11	8	19	26	41	36
GM-PG114	G1-1/4"	G1-1/4"	11	11	22	28	46	41
GM-PG134	G1-3/4"	G1-3/4"	12	12	24	38	52	46
GM-PG200	G2"	G2"	12	16	28	54	71	66

Circular Plastic Oil Sight Glass(Metric Thread)
Item No.	Size	A(mm)	B(mm)	C(mm)	D(mm)	E(mm)	F(mm)	Max MPa/Temperateru
GM-PCM16	M16	M16x1.5	7	8	15	14	20	0.4MPa / Below Zero 20 to 70 Centigrade
GM-PCM27	M27	M27x1.5	9	9	18	22	36
GM-PCM42	M42	M42x1.5	12	10	22	38	51
GM-PCM60	M60	M60x2.0	13	12	25	54	66

Press Fit Plastic Circular Oil Sight Glass
Item No.	Fit Size	E(mm)	B(mm)	C(mm)	D(mm)	A(mm)	F(mm)	Max MPa/Temperateru
GM-PP20	20	12	6	9	15	20	22	0.2MPa / Below Zero 20 to 70 Centigrade
GM-PP25	25	16	6	9	15	25	28
GM-PP32	32	20	7	9	17	32	35
GM-PP38	38	25	8	9	17	38	40
GM-PP40	40	28	8	10	18	40	45
GM-PP45	45	32	10	11	21	45	48
GM-PP55	55	40	10	11	21	55	58
GM-PP65	65	50	10	12	22	65	70

oil sight glasses

brass gauges

hydraulic gauges

breather vent plug