Collar flanges. Collar flanges GOST 12821 81 steel flat welded flanges

10.10.202327.05.2017

RUSEVROSTAL supplies stainless steel collar flanges GOST 12821-80 from stock and on order. A stainless steel flange made according to the GOST 12821-80 standard is a collar flange, round in shape with a protrusion (collar) designed for connecting pipes, tank equipment, shut-off and control valves, pumping and other equipment into a single system.

The size range of collar flanges of the GOST 12821-80 standard (GOST 12821-80) corresponds to the size range of stainless steel seamless pipes, shut-off and control valves and pipeline fittings made according to the GOST standard.

Stainless steel flanges GOST 12821-80 are made from various grades of steel and alloys, depending on the environment and working environment where these flanges will be used.

Steel grade:(08)12Х18Н10Т, 10Х17Н13М2Т (acid-resistant), 20Х23Н18 (heat-resistant).
Operating pressure: from 0.1 MPa to 6.3 MPa (from 1 kgf/cm², to 63 kgf/cm²).
Working temperature: from -60°С to +600°С.
Designation and marking of stainless steel flange: flange 1-50-10 GOST 12821-80, where (1 - version of the sealing surface, 50 - nominal diameter of the flange, 10 - permissible operating pressure of this flange, GOST 12820-80 - collar flange standard).
Minimum order of flanges is from 1 piece.
Manufacturer country: Russia, China.

Flange GOST 12821-80 types of sealing surface design

Scope of application

High operating pressure up to 20 MPa allows the use of the collar flange GOST 12821-80 12x18n10t in particularly critical areas:

oil and gas and chemical industry
defense and shipbuilding industry
Atomic industry
production of shut-off and control valves
production of capacitive, pumping and other equipment

Dimensions of stainless steel collar flange GOST 12821-80 steel grades 12Х18Н10Т/10Х17Н13М2Т for pressure Ru 10/16
Du, mm	External diameter (D), mm	Diameter between axial distance (D0), mm	Fastener size (d0), mm		Outer diameter of collar (Dn), mm	Internal diameter (d1), mm	Flange thickness (b), mm	Flange height (h4), mm	Number of fasteners. hole (n), pcs.	Weight of one flange, kg
15	95/95	65/65	14/14	30/30	19/19	12/12	10/12	33/33	4/4	0,6/0,7
20	105/105	75/75	14/14	38/38	26/26	18/18	12/12	36/36	4/4	0,8/0,9
25	115/115	85/85	14/14	45/45	33/33	25/25	12/12	38/38	4/4	1/1,1
32	135/135	100/100	18/18	55/55	39/39	31/31	13/13	40/40	4/4	1,5/1,6
40	145/145	110/110	18/18	62/64	46/46	38/38	13/13	42/42	4/4	1,8/1,9
50	160/160	125/125	18/18	76/76	58/58	49/49	13/13	42/45	4/4	2,2/2,3
65	180/180	145/145	18/18	94/94	77/77	66/66	15/15	45/47	4/4	3,1/3,2
80	195/195	160/160	18/18	105/110	90/90	78/78	15/17	47/50	4/4	3,6/4,2
100	215/215	180/180	18/18	128/130	110/110	96/96	17/17	48/50	8/8	4,7/4,9
125	245/245	210/210	18/18	156/156	135/135	121/121	19/19	57/57	8/8	6,7/6,8
150	280/280	240/240	22/22	180/180	161/161	146/146	19/19	57/57	8/8	8/8,3
200	335/335	295/295	22/22	240/240	222/222	202/202	19/21	58/58	8/12	11,3/12
250	390/405	350/355	22/26	290/292	278/278	254/254	21/23	60/65	12/12	14,6/17
300	440/460	400/410	22/26	345/345	330/330	303/303	22/24	60/66	12/12	18,5/23
350	500/520	460/470	22/26	400/400	382/382	351/351	22/28	60/70	16/16	24/32
400	565/580	515/525	26/30	445/450	432/432	398/398	22/32	60/75	16/16	30/43
500	670/710	620/650	26/33	550/559	535/535	501/501	24/38	65/90	20/20	40/71
600	780/840	725/770	30/39	650/660	636/636	602/602	24/41	65/90	20/20	49/100
800	1010/1020	950/950	33/39	850/850	826/826	792/792	27/45	75/95	24/24	87/130
1000	1220/1255	1160/1170	33/45	1050/1060	1028/1028	992/992	29/49	80/110	28/28	120/203

steel grades 12Х18Н10Т/10Х17Н13М2Т for pressure Ru 25/40
Duh, mm	External diameter (D), mm	Diameter between axial distance (D0), mm	Fastener size (d0), mm	Diameter at the base of the collar (Dm), mm		Internal diameter (dB), mm	Flange thickness (b), mm	Gate height nick (h4), mm	Number of fasteners. hole tium(n), pcs.	Weight of one flange, kg
15	95/95	65/65	14/14	30/30	19/19	12/12	14/14	33/33	4/4	0,8/0,8
20	105/105	75/75	14/14	38/38	26/26	18/18	14/14	34/34	4/4	1/1
25	115/115	85/85	14/14	45/45	33/33	25/25	14/14	36/36	4/4	1,2/1,2
32	135/135	100/100	18/18	56/56	39/39	31/31	16/16	43/43	4/4	1,8/1,8
40	145/145	110/110	18/18	64/64	46/46	38/38	16/16	45/45	4/4	2,1/2,2
50	160/160	125/125	18/18	76/76	58/58	49/49	17/17	45/45	4/4	2,8/2,8
65	180/180	145/145	18/18	96/96	77/77	66/66	19/19	50/50	8/8	3,8/3,8
80	195/195	160/160	18/18	110/	90/90	78/78	19/21	52/55	8/8	4,4/4,9
100	230/230	190/190	22/22	132/138	110/110	96/96	21/23	58/65	8/8	6,6/7,4
125	270/270	220/220	26/26	160/160	135/135	121/120	23/25	65/65	8/8	9,4/1,0
150	300/300	250/250	26/26	186/186	161/161	146/146	25/27	68/68	8/8	12,5/13
200	360/375	310/320	26/30	245/250	222/222	202/202	27/35	75/85	12/12	17,5/24
250	425/445	370/385	30/33	300/310	278/278	254/252	29/39	75/98	12/12	24,4/37
300	485/510	430/450	30/33	352/368	330/330	303/301	32/42	80/112	16/16	33,3/57
350	550/570	490/510	33/33	406/418	382/382	351/351	36/48	85/116	16/16	46,6/70
400	610/655	550/585	33/39	463/480	432/432	398/398	40/54	100/135	16/16	65/107
500	730/755	660/670	39/45	570/580	535/535	500/495	44/58	100/140	20/20	89/133
600	840/890	770/795	39/52	670/686	636/636	600/595	49/58	115/140	20/20	123/181
800	1075/1135	990/1030	45/56	874/908	826/826	790/795	55/71	135/190	24/24	214/344
1000	1315/1360	1210/1250	56/56	1084/1140	1028/1028	992/995	59/77	150/235	28/28	312/541

The dimensions in the table correspond only to GOST 12821-80 flanges
with sealing version 1

Dimensions of stainless steel flange GOST 12821-80 steel grades 12Х18Н10Т/10Х17Н13М2Т for pressure Ru 63
Du, mm	External diameter (D), mm	Diameter between axial distance (D0), mm	Fastener size (d0), mm	Diameter at the base of the collar (Dm), mm	Collar outer diameter (Dn), mm	Diameter internal ni (dB), mm	Flange thickness (b), mm	Gate height nick (h4), mm	Number of crepes holes (n), pcs.	Weight of one flange, kg
15	105	75	14	38	19	12	16	46	4	1,1
20	125	90	18	48	26	18	18	54	4	1,9
25	135	100	18	52	33	25	20	56	4	2,2
32	150	110	22	64	39	31	21	60	4	3
40	165	125	22	74	46	37	21	65	4	3,8
50	175	135	22	86	58	47	23	67	4	4,7
65	200	160	22	106	77	64	25	72	8	6,3
80	210	170	22	120	90	77	27	72	8	7,3
100	250	200	26	140	110	94	29	77	8	11
125	295	240	30	172	135	118	33	95	8	17
150	340	280	33	206	161	142	35	105	8	25
200	405	345	33	264	222	198	41	110	12	36,6
250	470	400	39	316	278	246	45	115	12	51
300	530	460	39	370	330	294	50	120	16	69
350	595	525	39	430	382	342	56	140	16	99

The dimensions in the table correspond only to GOST 12821-80 flanges
with sealing version 1

If you have any questions, please contact us in a way convenient for you.

Pipeline connecting fittings form several groups of parts for installing parts of a pipeline or connecting containers, units and other types of equipment to it by tightening with bolts or studs. This type of product includes collar flanges, the design of which is somewhat different from similar products. They have a conical protrusion along the diameter of the pipe and are welded end-to-end with this protrusion to the pipe.

№	Steel collar flange GOST 12821-80	Price with VAT
Welded steel collar flanges GOST 12821
1	Collar flange 1-15-25 art. 20 GOST 12821-80	100.00 rub.
2	Collar flange 7-100-63 art. 20 GOST 12821-80	160.00 rub.
3	Collar flange 1-150-40 st.09G2S GOST 12820-80	220.00 rub.
4	Collar flange 1-300-160 st. 15Х5М GOST 12820-80	RUB 308.00
5	Collar flange 1-400-25 art. 20 GOST 33259-2015	RUB 375.00
6	Collar flange 1-600-25 art. 20 GOST 33259-2015	475.00 rub.
Collar flanges according to GOST in stock and to order from the manufacturer in Moscow

How collar flanges and fittings are made

Butt-welded steel flanges are identical in manufacturing method to the manufacturing methods of shut-off pipe fittings of similar types. They are made from rolled metal products or blanks obtained by hot forging/stamping, followed by mechanical processing. They can be produced using the following method:

electroslag (TSESHL) centrifugal casting;
forging parts;
hot stamping;
bending of steel strip;
gas cutting;

The company uses in its work all methods of manufacturing steel collar flanges with consistently high requirements for the quality of its products. The most convenient and, of course, profitable area is cooperation on an ongoing basis. By becoming a regular customer of the company, you will immediately feel all the benefits of your position, first of all, this concerns participation in promotions and other events related to reducing the cost of products. Plus - excellent quality and timely deliveries.

Features of shut-off valves

Since the role of shut-off valves, in particular steel collar flanges, in the operation of pipelines and equipment is enormous, the requirements placed on them are very high. The reliability of the engineering system directly depends on the quality of the flange connections of the pipeline parts. Modern technologies make it possible to produce shut-off valves of very high quality.

Constant monitoring of product quality standards, product resistance to corrosion, and resistance to aggressive environments is an incomplete list of requirements to which collar flanges are subject. To withstand aggressive environments, preference is given to stainless steel products. Collar flanges can be used either as independent fasteners or in combination with rings, gaskets, washers and other sealing elements.

Shut-off valves, which include collar flanges, are the key to the tightness of the pipeline, therefore the requirements are comparable to the operating conditions.

Manufacturing method	Specifications	Ordering designation (example)
From rolled metal products or billets obtained by hot forging/stamping, followed by mechanical processing	Flanges are manufactured from DN 10 to DN 1600, with mounting sizes of 1 - 5, 8, 9.	Steel flange butt-welded flange DN 200 mm on PN 6.3 MPa (63.0 atm) made of steel 20 with a connecting projection of version 2
	Conditional pressure from 0.1 MPa (1 kgf/cm2) to 20 MPa (200 kgf/cm2)	Flange 2-200-63 art. 20 GOST 12821-80
	The ambient temperature is from minus 253°C to plus 600°C.
	They are used to connect pipeline fittings (gate valves, gate valves) to pipelines and pipelines to equipment (pumps, tanks, heat exchangers), as well as to connect individual sections of pipelines to each other

Steel butt weld flange (Collar flange) - a connecting part of pipelines, fittings, shafts, vessels, tanks, instruments, etc., consisting of a disk with holes for bolts (or studs) and a characteristic axially symmetrical protrusion in the shape of a truncated cone (“collar” or “neck” , neck, hub) for butt welding. Collar flange, along with the flat flange, is one of the frequently used connecting elements of pipelines. In foreign industrial terminology, collar flanges have the name Weld Neck Flange, or WN Flange.

The collar flange is used for hermetically sealing connection of individual parts of high pressure pipelines or for connecting process pipelines to tanks, vessels or apparatus. Application of collar flanges allows you to break the connection without cutting a pipe (often pipes with a fairly thick wall) to dismantle or modernize part of the pipeline; in this sense, the flange connection is “reusable”. The collar (neck) transfers forces to the pipe, reducing stress concentration at the base of the collar flange. The gradual transition of thickness from the base of the collar to the thickness of the pipe wall in the weld ensures the reliability of the collar flange. The flange diameter matches the pipe diameter, reducing turbulence and erosion of the flange joint. Used collar flange on pipelines where the nominal pressure is 0.1 - 20.0 MPa (1 - 200 kgf/cm²), and the temperature of the working environment ranges from -253°C to +600°C.

During installation collar flange does not fit onto the pipe like a flat flange, but is butt welded to it with one weld.

Collar flanges GOST 12821-80

Production of collar flanges is regulated by the domestic regulatory and technical document GOST 12821-80 "Steel butt-welded flanges on Ru from 0.1 to 20.0 MPa (from 1 to 200 kgf/cm²). Design and dimensions." The wording in English is " Steel butt-welded flanges for Pnom from 0.1 to 20.0 MPa (from 1 to 200 kgf/cm²). Design and dimensions". This document, standardizing collar flanges, was introduced to replace GOST 12829-67, GOST 12833-67 and GOST 12835-67.

According to GOST 12815-80, there are 9 different designs collar flanges: 1) collar flanges with a connecting projection; 2) collar flanges with a projection; 3) collar flanges with a cavity; 4) collar flanges with a spike; 5) collar flanges with a groove; 6) collar flanges with a recess for a lens seal; 7) collar flanges for an oval-section sealing gasket; 8) collar flanges with a spike for a fluoroplastic gasket; 9) collar flanges with a groove for a fluoroplastic gasket.

GOST 12821-80 establishes an example of a designation when ordering round steel butt weld flange Dy 50 mm at RU 1.0 MPa (10 kgf/cm²) from steel 25, version 1 (with a connecting projection):
Flange 1-50-10 St 25 GOST 12821-80,
Where:
1 - design of the collar flange;
50 - nominal bore, mm - (D y, DN);
10 - conditional pressure, kgf/cm² - (P y, РN);
St 25 is the steel grade from which the collar flange is made.

The appendix to GOST 12821-80 contains a table of compliance with OKP codes (All-Russian Product Classifier). For example, a collar flange with the designation 1-100-2.5 has OKP code 37 9941 4290 00, and stainless collar flange of the same designation - code 37 9941-5233 05.

We produce collar flanges nominal diameters 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 500, 600,700, 800, 900, 1000, 1200, 1400, 16 00, 1800 mm and above and nominal pressures: 6, 10, 16, 25, 40, 63, 100, 160, 200 kgf/cm². We will also produce butt welded steel flanges other diameters according to your drawing.

Collar flanges DIN

Collar flanges according to the German DIN standard (Deutsches Institute für Normung, German Institute for Standardization). DIN (Welding Neck Flanges) collar flanges include flanges manufactured according to the following standards:

DIN 2627 Weld Neck Flange PN400,
DIN 2628 Weld Neck Flange PN250,
DIN 2629 Weld Neck Flange PN320,
DIN 2630 Weld Neck Flange PN1 and 2.5,
DIN 2631 Weld Neck Flange PN6,
DIN 2632 Weld Neck Flange PN10,
DIN 2633 Weld Neck Flange PN16,
DIN 2634 Weld Neck Flange PN25,
DIN 2635 Weld Neck Flange PN40,
DIN 2636 Weld Neck Flange PN64,
DIN 2637 Weld Neck Flange PN100,
DIN 2638 Weld Neck Flange PN160.
DIN 86029 Hubbed Slip-on Flange PN10, DIN 86030 Hubbed Slip-on Flange PN16.

PN - conditional (nominal) pressure, kgf/cm².

Collar flange EN

Standards published by the European Committee for Standardization are called EN. The document DIN EN 1092-1 regulates the standards for flanges. Collar flanges (Weld-neck flanges) have type (type, typ) 11 - Weld-neck flanges and are available for pressures PN 2.5, PN 6, PN 10, PN 25, PN 40, PN 63, PN 100.

PN (nominal pressure) - conditional pressure, kgf/cm².

The following is a table of conformity between EN 1092-1 and DIN for collar flanges. For EN 1092-1, equivalent DIN standards are specified for each nominal pressure. Collar flange types described only in EN 1092-1, but not described in DIN, are indicated by the symbol "+". The symbol "-" means that there is no standard for this pressure. The underlined standard numbers are taken from DIN.

Conformity table for collar flanges to DIN and EN 1092-1 standards

Type according to EN		11	12	13
Flange type		Weld-neck flanges(steel collar flanges butt welded)	Hubbed slip-on flanges for welding(welded steel collar flanges)	Hubbed threaded flanges(threaded collar flanges)
Drawing
PN	2,5	2630	-	-
	6	2631	+	2565
	10	2632	86029	+
	16	2633	86030	2566
	25	2634	+	+
	40	2635	+	2567
	63	2636	+	2568
	100	2637	+	2569
	160	2638	-	-
	250	2628	-	-
	320	2629	-	-
	400	2627	-	-

Collar flange ASME/ANSI

According to ASME/ANSI (ASME - American Society of Mechanical Engineers, American National Standards Institute), collar flanges are called Welding Neck and are manufactured in accordance with ASME/ANSI B16.5 - 1996 - "Pipe Flanges and Flanged Fittings" and ASME/ANSI B16.47 "Large Diameter Steel Flange". ASME/ANSI B16.5 standardizes the production of flanges (including collar flanges) with a nominal diameter from 1/2 to 24 inches; collar flanges of large diameters (26 - 60 inches) are manufactured in accordance with the requirements of ASME/ANSI B16.47. This standard describes temperature and pressure modes, materials, dimensions, tolerances, markings, etc.

The figure on the right shows the following symbols:
A - neck diameter weld neck, or hub diameter at bevel;
X - collar diameter at the base (hub diameter);
Y 1 - collar length (weld neck length through hub);
C - thickness (thickness);
R - diameter of the connecting protrusion (raised face diameter);
O - outside diameter;
B 1 - internal diameter of the pipe (weld neck bore);

In accordance with ASME/ANSI B16.5, flanges are divided into classes (Class, permissible nominal pressure in pounds per square inch): 150, 300, 400, 600, 900, 1500, and 2500. To convert from units " class" in kgf/cm², it is necessary to divide the "class" value by 6. ANSI/ASME B16.47 includes classes 75, 150, 300, 400, 600, 900.

Non-standard collar flanges according to drawing

Non-standard collar flanges, manufactured according to customer drawings, are necessary if it is necessary to connect two pipelines built according to different standards, or parts of pipelines of different standards.

The use of various steels for the manufacture of collar flanges

The collar flange is made by processing a cast ring blank from the following steels: 3, 20, 20FA (structural high-quality carbon), 09G2S (structural low-alloy for welded structures) - collar flanges for cryogenic temperature conditions, 13HFA; 15Х5М (heat-resistant collar flanges); stainless steel collar flanges made of corrosion-resistant steels 20Х13, 14Х17Н2, 08Х18Н10Т, 12Х18Н10Т, 06ХН28МДТ, 10Х17Н13М2Т, 10Х17Н13М3Т, 10Х11Н23Т3МР.

Flanges in accordance with GOST 12821-80 are a steel part with which the parts of a pipeline and pipeline fittings are installed and connected to each other. The connection (pipe and flange) is made by butt welding the flange to the pipe.

Scheme for connecting the collar flange to the pipe

The GOST 12821-80 flange is butt welded to the pipe, unlike a flat one, and is welded along the contour with a continuous weld.

Selection of collar flanges

The choice of GOST 12821-80 flanges depends on the necessary parameters for connecting it to the mating element. The diameter of the flange Du (mm), the required operating pressure Ru (kgf/cm2), the design of the sealing surface, the steel grade, and the production method are taken into account.

The geometric characteristics and installation dimensions of collar flanges during their design and production are reflected in GOST 12821-80, the size range of the sealing surface is selected according to GOST 12815-80, collar flanges, like flat ones, can have 9 options for the design of the pressure surface.

Production of flanges according to GOST 12821-80

Collar flanges can be made from cast or forged blanks (forgings).

Our company produces and supplies flanges from forged or stamped blanks, the so-called forgings in accordance with GOST 8479-70; in the production of stainless steel collar flanges, forgings in accordance with GOST 25054-81 are used as a blank. Forged flanges have improved properties compared to castings and their scope of application is wider than cast products. The heat treatment of the flanges we supply meets the necessary norms and standards.

Material and technical parameters of flanges when choosing GOST 12821-80

When choosing flanges, you need to know the diameter of the flange DN, the pressure PN, the grade of steel from which the flange is made and the design of the flange.

Sometimes situations arise when a purchasing manager needs to select flanges for certain fittings and the flange parameters are missing. In these cases, we recommend contacting the engineering specialists of our company, who will help you select the necessary sets of flanges and accompanying materials, in accordance with the products where collar flanges serve as counter elements.

Material of supplied flanges GOST 12821-80: st.20, 09G2S, 13HFA, 12Х18Н10Т, 10Х17Н13М2Т.

Diameters from DN50 to DN800, pressure from PN50 to PN200. If the required flange design is not available, our company will provide the service of regrinding into the required one from existing stock.

Flange markings

After production, our flanges are marked in the location specified in the manufacturing process.

Flange marking can be done using the knurling or impact method.

The flange marking contains a description of the flange, steel grade, and metal melt number. Marking of additional inscriptions can be agreed upon individually when placing an order.

Testing and methods of inspection of flanges according to GOST 12821-80

Product control is carried out by the technical quality control department of our enterprise. Control begins with incoming inspection of the metal from which the products are made. After manufacturing the workpiece (forging) and carrying out heat treatment, the chemical composition of the metal is checked again and tested to identify mechanical properties. At the customer's request, we carry out additional ultrasonic testing with the preparation of a test report.

After passing all tests, the flanges are packed in a standard manner on a pallet, having previously been treated with graphite lubricant to prevent corrosion and shipped to the buyer or to a storage location.

Before shipping products to the buyer from the warehouse, visual inspection of the integrity of the packaging is carried out.

All of the above data are entered into the product passport. When purchasing our products, we issue a passport for the part, a quality certificate, additional test reports, and if necessary and with prior approval, we can issue a measurement card or drawings for the product.

How to buy a collar flange GOST 12821-80

To order and purchase a collar flange, you just need to contact us, or leave a request by email, with a detailed description of the parameters required for the flanges you need. You can also get online advice from our specialists on the pages of our website and use the feedback form.

We will help you select and complete your order with related products: gaskets for seals, fasteners.

The price range for flanges is determined individually; we provide discounts to wholesale buyers and regular customers. Deferred payments are possible for regular customers.

In the catalog, collar flanges GOST 12821-80 are represented by butt-welded parts:

made of steel 20;
made of steel 09G2S;
stainless;
galvanized.

The size range of connecting fittings corresponds to the size range of standard seamless steel pipes.

The price of a collar flange is higher than that of a flat flange due to higher metal consumption and manufacturing complexity. In addition, the oversized product increases the volume of the pipeline into which it is built. Despite this, parts of this design are the most in demand, since the economic benefits of their use are obvious.

Features of collar flanges

Unlike flat ones, collar flanges are made with a so-called “collar” (skirt ring). A symmetrical protrusion in the form of a truncated cone with a groove, complementing the design, creates conditions for precise joining with the pipe, allowing the part to be reused without the need to cut the pipe to which it is connected.

The collar, 1 to 10 cm long, can be positioned perpendicular or oblique to the base. For small-sized pipes, flanges with narrowed collars are recommended; such modifications help level out pressure losses. A truncated cone reduces stress on the base because it transfers forces to the pipe, thereby creating an operational balance of the unit.

A collar-type flange is not pushed onto the pipe like a flat one, but is butt welded to the end of the pipe to form one weld. The collar is easily fused to the pipe; installation requires less skill than welding flat flanges.

The base of the product has mounting holes for fasteners (threaded rods or bolts) for connection to a mating flange.

Steel collar flanges GOST 12821-80 are used to assemble pipeline systems with nominal pressure from 0.1 to 20.0 MPa, transporting liquid and gaseous working media with temperatures from –253 to +600 degrees Celsius. Connecting fittings are necessary to create sealed circuits and are used to connect pipes to each other, as well as when connecting them to pumping units, apparatus, vessels, tanks and other technological equipment.

How to buy collar flanges GOST 12821-80 from Gremir LLC?

At the Gremir company you can buy collar flanges with deferred payment. Special conditions apply to legal entities over 3 years old. Gremir LLC sells collar flanges at low prices with delivery throughout Russia. To buy connecting fittings, reserve the required items through an application using the shopping cart. When choosing, be guided by the dimensional characteristics of the products, the material of manufacture, take into account the expected operating conditions, and cost.