Introduction to Flange Bolt Din 6921

Flange Bolt Din 6921 are bolts with a flange, or a ridge, at one end. This flange bolt acts like a built-in washer, distributing the load across a wider area and providing a more secure and stable connection. They are widely used in various industries due to their unique design and functionality.

DIN 6921 is a German standard that specifies the dimensions, material, and other technical specifications of flange bolts. This standard ensures the quality and compatibility of these bolts, making them reliable and effective for various applications.

product-800-693

Legend:

d2 - the inner diameter of the ring

b - length of the thread (at least)

l - length of bolt

d - the nominal diameter of the thread

k - head height

s - size hex head turnkey

Makings:

Steel: 8.8, 10.9

Stainless: carbon steel

Plastic: -

Non Ferrous: -

Thread: 6g

FLANGE BOLT DIN 6921:dimensions in mm

Tdread size d		M5	M6	M8	M10	M12	(M14)	M16	M20
		-	-	M8 x 1	M10 x 1,25	M12 x 1,5	(M14x1,5)	M16 x 1,5	M20 x 1,5
		-	-	-	(M10 x 1)	(M10 x 1,25)	-	-	-
P		0,8	1	1,25	1,5	1,75	2	2	2,5
C	Min.	1	1,1	1,2	1,5	1,8	2,1	2,4	3
da	Min.	5	6	8	10	12	14	16	20
da	Max.	5,75	6,75	8,75	10,8	13	15,1	17,3	21,6
dc	Max.	11,8	14,2	17,9	21,8	26	29,9	34,5	42,8
dw	Min.	9,8	12,2	15,8	19,6	23,8	27,6	31,9	39,9
e	Min.	8,79	11,05	14,38	16,64	20,03	23,36	26,75	32,95
h	Max.	6,2	7,3	9,4	11,4	13,8	15,9	18,3	22,4
m	Min.	4,7	5,7	7,6	9,6	11,6	13,3	15,3	18,9
m´	Min.	2,2	3,1	4,5	5,5	6,7	7,8	9	11,1
s	Nominal size = max.	8	10	13	15	18	21	24	30
s	Min.	7,78	9,78	12,73	14,73	17,73	20,67	23,67	29,16
r	Max.	0,3	0,36	0,48	0,6	0,72	0,88	0,96	1,2

Tab 2.

Thread d			M5		M6		M8		M10		M12		M14		M16		M 20
			-		-		M8 x 1		M10 x 1,25		M12 x 1,5		M14 x 1,5		M16 x 1,5		M20 x 1,5
			-		-		-		(M10 x 1)		(M12 x 1,25)		-		-		-
l			Shank lengtds
nominal dimension	min.	max.	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max
10	9,71	10,29	-	2,4
12	11,65	12,35	-	2,4	-	3
16	15,65	16,35	-	2,4	-	3	-	4
20	19,58	20,42	-	4	-	3	-	4	-	4,5
25	24,58	25,42	5	9	2	7	-	4	-	4,5	-	5,3
30	29,58	30,42	10	14	7	12	-	8	-	4,5	-	5,3	-	6
35	34,5	35,5	15	19	12	17	6,75	13	-	9	-	5,3	-	6	-	6
40	39,5	40,5	20	24	17	22	11,75	18	6,5	14	-	10	-	6	-	6	-	7,5
45	44,5	45,5	25	29	22	27	16,75	23	11,5	19	6,25	15	-	11	-	6	-	7,5
50	49,5	50,5	30	34	27	32	21,75	28	16,5	24	11,25	20	6	16	-	12	-	7,5
55	54,4	55,6			32	37	26,75	33	21,5	29	16,25	25	11	21	7	17	-	9
60	59,4	60,6			37	42	31,75	38	26,5	34	21,25	30	16	26	12	22	-	14
65	64,4	65,5					36,75	43	31,5	39	26,25	35	21	31	17	27	6,5	19
70	69,4	70,6					41,75	48	36,5	44	31,25	40	26	36	22	32	11,5	24
80	79,4	80,6					51,75	58	46,5	54	41,25	50	36	46	32	42	21,5	34
90	89,3	90,7							56,5	64	51,25	60	46	56	42	52	31,5	44
100	99,3	100,7							66,5	74	61,25	70	56	66	52	62	41,5	54
110	109,3	110,7									71,25	80	66	76	62	72	51,5	54
120	119,3	120,7									81,25	90	76	86	72	82	61,5	74
130	129,2	130,8											80	90	76	86	65,5	78
140	139,2	140,8											90	100	86	96	75,5	88
150	149,2	150,8													96	106	85,5	98
160	159,2	160,8													106	116	95,5	108
180	179,2	180,8															115,5	128
200	199	201

Advantages of Flange Bolt Din 6921

Flange Bolt Din 6921 offer several advantages that make them suitable for specific applications:

1. Enhanced Stability: The integrated flange provides additional stability and prevents the bolt from rotating or loosening under dynamic loads or vibrations.
2. Reduced Assembly Time: Flange Bolt Din 6921 eliminate the need for separate washers, reducing assembly time and simplifying installation procedures.
3. Improved Load Distribution: The flange distributes the applied load over a larger surface area, reducing stress concentrations and minimizing the risk of damage to the mating surface.
4. Corrosion Resistance: Flange bolts are available in materials such as stainless steel, which offers excellent corrosion resistance, making them suitable for outdoor and corrosive environments.

Material Types for Flange Bolt Din 6921

Steel:

Steel is a common material used for flange bolt din 6921 due to its strength and durability. It can withstand high levels of stress and is resistant to wear and tear, making it ideal for heavy-duty applications.

Stainless Steel:

Stainless steel is another popular material for flange bolt din 6921. It offers excellent corrosion resistance, making it suitable for use in environments where the bolts may be exposed to moisture or chemicals.

Carbon Steel:

Carbon steel is a type of steel that has a higher carbon content than regular steel. This makes it harder and stronger, but also more brittle. Carbon steel flange bolts are often used in applications that require high strength.

Applications of Flange Bolt Din 6921

Flange Bolt Din 6921 find extensive use across different industries and applications due to their unique design and advantageous features. Some common applications include:

1. Automotive Industry: In automotive manufacturing and repair, flange bolts are utilized in critical areas such as engine assembly, transmission mounting, suspension components, and exhaust systems. The flange provides enhanced stability and prevents the bolt from loosening due to vibration or dynamic forces.
2. Construction and Structural Engineering: Flange bolts play a vital role in construction projects, including building structures, bridges, and infrastructure. They are used for connecting steel beams, columns, brackets, and other structural elements, ensuring secure and stable assemblies. The flange helps distribute the load evenly, reducing the risk of structural failure.
3. Machinery and Equipment Assembly: In industrial machinery and equipment assembly, flange bolts are preferred for their reliability and resistance to loosening under heavy loads or constant vibrations. They are commonly used in manufacturing plants, processing facilities, and agricultural machinery for securing components such as motors, gearboxes, and conveyor systems.
4. Plumbing and HVAC Systems: Flange Bolt Din 6921 are employed in plumbing and HVAC (heating, ventilation, and air conditioning) systems for joining pipes, ductwork, and equipment. The flange provides a tight seal and prevents leakage, ensuring efficient operation and minimizing maintenance requirements.
5. Aerospace and Marine Applications: In aerospace and marine industries, flange bolts are utilized in critical applications where high strength, corrosion resistance, and reliability are paramount. They are used in aircraft assembly, shipbuilding, and offshore structures for securing components subjected to extreme conditions, including temperature variations and saltwater exposure.

Flange Bolt Din 6921 suppliers Product Recommendations

1. Carbon Steel Wedge Anchor:

Carbon Steel Wedge Anchors are heavy duty mechanical anchors designed for consistent performance in solid concrete or grout filled concrete masonry. The anchor is threaded and comes complete with a nut and washer.

2. Drywall Screws Black:

Drywall Screws Blacks have a phosphate coating that is supposed to keep the wet drywall compound from causing the screw head to rust. Although the coating does help prevent rusting, it doesn't stop rusting altogether, which is why drywall screws blacks are recommended only for indoor projects, due to their tendency to sometimes rust.

3. Flat Washer Din125:

Flat Washer DIN 125: A flat annulus or ring, often made of metal, used to spread the load of a screwed fastening. Additionally, a plain washer may be used when the hole has a larger diameter than the fixing nut.

4. High Strength Flat Washer Grade 8.8:

High Strength Flat Washer Grade 8.8 is made from high-strength steel with a grade of 8.8, corresponding to the material of the accompanying bolt. It is a component of the armor set along with the bolt and nut, taking the form of a thin plate with a hole.

5. High Strength Wear Resistant Steel Plate:

A high strength wear resistant steel plate is made from an alloy of stainless steel that contains at least 0.2 % nickel, aluminum, or copper. High Strength Wear Resistant Steel Plate is frequently used in the manufacturing of structural components and tools. The alloy is resistant to wear, corrosion, and rust.

Flange Bolt Din 6921 Manufacturers Questions Guide:

FAQ

Q: What are flange bolt din 6921?

A: Flange Bolt Din 6921 are bolts with a flange, or a ridge, at one end. This flange acts like a built-in washer, distributing the load across a wider area and providing a more secure and stable connection.

Q: What is DIN 6921?

A: DIN 6921 is a German standard that specifies the dimensions, material, and other technical specifications of flange bolts.

Q: What materials are used for flange bolt din 6921?

A: Flange Bolt Din 6921 can be made from various materials, including steel, stainless steel, and carbon steel. The choice of material depends on the specific requirements of the application.

Q: What are the different surface treatments for flange bolts din 6921?

A: Surface treatments for flange bolts include plain, zinc plated, zinc flake, phosphate, and YZP. These treatments enhance the performance and lifespan of the bolts.

Q: How to tighten pipe flange bolts?

A: Final torque for the pipe flange bolts is dependent on the type of gasket used. This torque provides the clamp load on the gasket needed for proper sealing. Metallic and spiral type gaskets require greater clamping force than flat rubber gasket material. Higher system pressures lead to increased fastener torques. Pipe flange gaskets are never be used to pull the piping up to the pump. This can stretch the bolt, bend a pipe flange, break the pump casting or bend a suction plate. Rather, pipe flange bolts can fill the gap between the pump and spool piece by using the correct tightening sequence. Pipe flange bolts should be tightened in the correct sequences as illustrated below.

Q: What is the difference between Grade 4.8 and 8.8 bolts?

A: The bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat treated (quenched and tempered). Carbon steel grade 4.8 bolts are commonly referred to as high strength bolts, and the others are commonly referred to as ordinary bolts.

Q: What are the types of Hex Bolt?

A: Here are some different types of hex bolts:
Grade 8 plain: A bare metal bolt with a fine thread made from medium carbon alloy steel that's quenched and tempered. Grade 8 bolts are harder and have a higher tensile strength than grade 5 bolts, but they're also more brittle.
Grade 5 plain: A bare metal bolt with a coarse thread.
Heavy: A structural bolt that meets the requirements of ASTM A325.

Q: What is the equivalent of DIN 912?

A: DIN 912 and ISO 4762 are equivalent standards, with the only difference in the standards themselves being that some nominal sizes were cut and that a fine thread standard (ISO 12474) was created.

Q: What are the applications of Hook Bolt Zinc Plated?

A: A hook bolt zinc plated is a type of bolt that's coated in zinc and can be used for hanging items on walls or ceilings. Zinc plating can provide corrosion resistance and moderate heat resistance, and it's also cheaper than stainless steel. Hook Bolt Zinc Plated can be used for a variety of applications, including:
Hanging items: Hook bolts can be used to hang art, house plants, and frames on walls or ceilings. They can also be used to suspend cables, chains, and wire.
Roofing: Hook bolts can be used to fix roofing sheets.

Q: Why use hook bolt zinc plated?

A: Hook Bolt Zinc Plated can be a good choice for many applications because they are inexpensive, provide some corrosion resistance, and have other benefits:
Cost: Zinc is inexpensive to obtain and process, making zinc-plated bolts cheaper than stainless steel.
Corrosion resistance: Zinc corrodes more slowly than other metals, such as steel, and can protect the base metal from moisture and oxygen. However, zinc plating may not be enough in wet or humid environments, and zinc is also susceptible to acids and alkalis.
Other benefits: Zinc plating can also add lubricity to the threads, increase surface hardness, and provide moderate heat resistance up to 400° F. Zinc is also recyclable, making it a sustainable option.

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