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DIN3021标准-弹簧卡箍

April 1998

Hose clamps

Spring Band Clamps (SBC) Part 1: Dimensions, marking, materials, types

DIN 3021-1

ICS 21.060.70

Hose clamps - Spring band clamp - Part 1: Dimensions, marking, materials, types

Colliers de serrage - Colliers de ressort - Partie 1: dimensions, designation, matiéres premiéres, type

Foreword

This standard draft was drawn up by the study group Standardisation of Spring Band Clamps in the Standards Committee Iron, Sheet and Metalware (NA EBM).

DIN 3021

Hose clamps - spring band clamps (SBC) comprise:

Part 1: Dimensions, designation, materials

Part 2: Technical delivery conditions

Part 3: System: spring band clamp/hose/spigot

Annexes A and B are for information.

Warning remarks about application

This standard draft is submitted to the public for checking and comments. Since the intended standard may differ from the present version, application of this draft shall be agreed upon in a special form. Please refer comments to Normenausschuss Eisen-, Blech- und Metallwaren (NA EBM) in DIN, Kaiserswerther Str. 135, D-40474 Duesseldorf.

1 Field of application

This standard is applicable to spring band clamps made from annealed strip steel used to attach hoses to mobile and stationary plants for application in a temperature range from -40 °C to +150 °C, in such fields as:? coolant circulation and servo system up to 300 kPa (3 bar) overpressure,

? fuel system up to 700 kPa (7 bar) overpressure,

? air intake system underpressure,

? air charge system up to 200 kPa (2 bar) overpressure,

to seal the hose/spigot connection.

The spring band clamp, hose and spigot is a system. Please see Annex A for design notes.

2 References to standards

This standard comprises dated or undated references, definitions from other publications. These references to standards are quoted at the relevant locations in the text, and the other publications are listed below. In the case of dated references, later amendments or revisions of this publications belong to this standard only, if they have been worked into the text by way of amendment or revisions. In the case of undated references the latest issue of the publications referred to shall apply.

DIN 3021-2

Hose clamps - spring band clamps - Part 2: Technical delivery conditions.

DIN 3021-3

Hose clamps - spring band clamps - Part 3: System: spring band clamps hose spigots

DIN 6784

Workpiece edges - terms, drawing details

DIN EN 10052

Terms for heat treatment of ferrous materials; German language version EN 10052: 1993

DIN ISO 2768-1

General tolerances - Part 1: Tolerances for lengths and angular dimensions without individual tolerances being entered. Identical to ISO 2768-1 : 1989.

Normenausschu? Eisen-, Blech- und Metallwaren (NA EBM) im DIN

Deutsches Institut für Normung e.V.

To be cont. Page 2 to 8

3 Dimensions, marking Dimensions in millimetres General tolerances: ISO 2768-m

The spring band clamps need not correspond to the pictorial representation; only the dimensions specified must

be maintained.

level y

Dimensional level x

Figure 1: Form A

level y

location

Figure 2: Form B

Marking of a spring band clamp Form A with nominal diameter dn=32 mm and a clamp width of 12 mm

Form

All inside edges

Table 1: Dimensions for Form A, c = 12 mm

Table 2: Dimensions for Form A, c = 15 mm

Dimensions in millimetres

Nominal diameter Delivery

diameter

Fully

opened

diameter

Material

thickness

Clamp

width

a b e g h

Gap

dimen.

dn1)da max. 2)do min. 3)s ± 0.44) c ± 0.34)max.max. 5)± 0.7± 0.7max.t max. 6) 131214.2

1413.315.8

151416.5

1614.917.20.8

1715.618.5

18161940

1917.820.2

2018.421.6

2119.622.5

2220.524.2 1.3

232124.70.12 24222615

2523.526.8

2624.328

2725.529

292731

302832.5 1.7

3229.534.5

3430.636.4

3531.53815138.77.560

3632.538.5

3733.540

3834.541.5

4035.542.5

4136.343.5

4237.544.5

4337.945.5

4438.546.5

4640.548.5 2.1

4741.550

4943.052

5043.5530.18 51445417.5

534655.8

55475875

585061

6153.565.5

6456.569 2.6

6759.572.5

1) - 6) see Table 1

Page 5

DIN 3021-1 Table 3: Dimensions for Form B, c = 12 mm

Dimensions in millimetres

Nominal diameter Delivery

diameter

Fully

opened

diameter

Material

thickness

Clamp

width

a b e g h

Gap

dimen.

dn1)da max. 2)do min. 3)s ± 0.44) c ± 0.34)max.max. 5)± 0.7± 0.7max.t max. 6) 131214.2

1413.315.8

151416.50.8

1614.917.5

1715.618.5

18161960

1917.820.2

2018.421.5

2119.422.5

2220.524.2 1.3

232124.70.09 242226

2523.526.3

2624.328

2725.229

2826.130.2

292731.5

302832.5

3229.534.5 1.7

3430.636.4

3531.538121247580

3632.539

3834.541.5

4035.542.5

4237.544.5

4337.945.5

4438.546.5

4640.548.5

4741.550 2.10.12 4942.552

5043.553

514454

534655.8

55475892

6051.563

6557.568

7061.573

756678 2.60.15 807083

857488110

907993

1) - 6) see Table 1

Page 6

DIN 3021-1 4 Clamping forces 7)

Figure 3: Clamping forces for Form A Figure 4: Clamping forces Form B

Table 4:

Tension forces for Form A and Form B with a

clamp width of c=12 mm Table 5:

Tension forces for Form A and Form B with a clamp width of c=15 mm

Nominal diameter

min. N

?F=Fx-Fy7)

Nominal

diameter

min. N

?F=Fx-Fy7) 8)

1414

15220170-10 - 1401520514510 - 120 1616

1717

1818

1919

20350280-10 - 1802036028010 - 160 2121

2222

2323

2424

2525

2626

2727

2828

294403900 - 2202946540520 - 200 3030

3232

3434

3535

3636

3837

4038

4240

4341

4442

4643

4744

4960050046

5047

5149

530 - 2405057051520 - 240 5551

6053

6555

7058

7561

8041035064

8567

7) Measuring method as per DIN 3021-2 Paragraph 4.4

8) ?F=Fy-Fx is applicable when crimped strip is used

5 Preselection of the nominal diameter

The field of application for spring band clamps is defined as D max. and D min. These two figures result from the respective hose/spigot dimensions concerned with their maximum tolerance deviations being taken into due consideration.

Equation to calculate the D min. and D max.

of a combined hose/spigot:D min =ds +4p (di +p )+0,2 mm min min min min 2

×D max =dw +4p (di +p )-0,2 mm

max max max max 2×whereby:D max.maximum fitting diameter D min.minimum fitting diameter di internal hose diameter ds spigot diameter dw bead diameter

hose wall thickness

The nominal diameter of the suitable spring band clamp dn is determined based on the field of application.What is recommended:

dn ≈ D min.do min. ≥ D max.

6 Materials

Cold-rolled strip according to table 6. The spring band clamps must be bainitised to 510 to 580 HV (please see DIN EN 10052 for the term bainitising). Phosphatising is inadmissible as a processing aid to produce cold-rolled steel strip.

Table 6: Material analysis, chemical composition

7 Type

7.1 Workpiece edges

Workpiece edges must be designed according to DIN 6784 and inside edges according to

7.2 Surface protection

Multilayer, chrom (VI)-free coating made out off a anorganic base coat containing zinc and a organic top coat .

A galvanic coating is inadmissible due to hydrogen embrittle.

7.3 Lubricants

Spring band clamps with a nominal diameter ≥ 32 mm must be coated with water-soluble lubricants (emulsion polish).

8 Technical delivery conditions

According to DIN 3021-2

9 Designation

The spring band clamp must be permanently marked on the lateral side (not on the circumference due to the notch effect) with the following:

? nominal diameter dn

? the manufacturer’s or supplier’s name or emblem.

The manufacturer or supplier may, on his own responsibility, indicate the spring band clamp coincides with this standard by marking it with the main standard number “DIN 3021”; however, he may only do so in conjunction with his name or emblem. It is up to the manufacturer or supplier as to how he makes this designation. However, care must be taken to ensure that surface protection is not damaged.

10 Clamp assembly

The spring band clamp may only be assembled with the tool recommended by its manufacturer. Use of the wrong tools will cause damage to the surface and deformation to the spring band clamps, which will cause early failure of the system.

Annex A (for information)

Explanations and design notes

Spring band clamps are non-positive fastening elements made from annealed spring strip steel for sealing hose/spigot connections in numerous fields of application. Due to its high degree of elasticity, the spring band clamps are able to follow changes in diameter in the hose/spigot connection inducted by temperature an ageing.

The sealing is effected by the clamp/hose/spigot system. Therefore spigot and hose must meet minimum requirements (see DIN 3021-3).

To obviate any danger of confusion when applied in adjacent mounting areas the user should select the nominal diameters in appropriate dimensions (e.g. the following graduations are applied to radiator systems in the automotive field: 14, 17, 19, 23, 27, 32, 40, 47 and 55).

Annex B (for information)

Subject characteristics see DIN 4000-44-2

Hose clamps

Spring Band Clamps (SBC) Part 2: Technical delivery conditions

DIN 3021-2

ICS 21.060.70

Hose clamps - Spring band clamp - Part 2: Technical delivery conditions

Colliers de serrage - Colliers de ressort - Partie 1: conditions techniques de livraison

Foreword

This standard draft was drawn up by the study group Standardisation of Spring Band Clamps in the Stan-dards Committee Iron, Sheet and Metalware (NA EBM).

DIN 3021

Hose clamps - spring band clamps (SBC) comprises:

Part 1: Dimensions, designation, materials

Part 2: Technical delivery conditions

Part 3: System: spring band clamps/hose/spigot

Warning remarks about application

1 Field of application

This standard is applicable to spring band clamps in accordance with DIN 3021-1.

2 References to standards

This standard comprises dated or undated references, definitions from other publications. These references to standards are quoted at the relevant locations in the text, and the other publications are listed below. In the case of dated references, later amendments or revisions of this publication belong to this standard only, if they have been worked into the text by way of amendment or revisions. In the case of undated references the latest issue of the publication referred to shall apply.

DIN 3021-1

Hose clamps - spring band clamps – Part 1: Dimensions, marking, materials, types.

DIN 50 021

Fog tests with various sodium chloride solutions

DIN 50133

Testing metallic materials – hardness test as per Vickers – range HV 0.2 to HV 100

DIN EN 10204

Metallic products – types of test certificates (contains amendment A1: 1995); German version EN 10204: 1991 + A1: 1995

Normenausschu? Eisen-, Blech- und Metallwaren (NA EBM) im DIN

Deutsches Institut für Normung e.V.

To be cont. Page 2 to 4

3 General testing conditions

New spring band clamps and new hose pieces shall be used for each test. The hose/spigot system must be allocated to the nominal diameter of the spring band clamp. Prior to testing the spring band clamp must be opened to its fully opened diameter and released again.

Special tests are to be arranged between user and manufacturer when required.

Use overpressure gauges featuring vault tolerances of 3 % maximum scale value for pressure testing.

Use force measurement devices featuring fault tolerances of 5 %.

4 Requirements, testing conditions

5 Certification and verification

The manufacturer shall confirm that the stipulations of this standard are maintained by works certificate 2.2 as per DIN EN 10204. The user may demand verification of the stipulations of this standard being maintained by the DIN testing and surveillance sign when required. (This sign is awarded by the German Association for Prod-uct Designation DGWK on application.)

6 Packaging

The manufacturer shall select the type of packaging. The contents of the packaging must be protected against moisture, corrosion, transport and storage damage, dirt and any other detrimental influences by conventional means, so that quality is not reduced under conventional transport conditions.

Each packaging unit may only contain products of one nominal size. The packaging must be marked perma-nently and legibly.

April 1998

Hose clamps

Spring Band Clamps (SBC) Part 3: System: spring band clamp/hose/spigot

DIN 3021-3

ICS 21.060.70

Hose clamps - Spring band clamp - Part 3: System: Spring band clamp/hose/spigot

Colliers de serrage - Colliers de ressort - Part 3: Systéme: Collier de ressort-tuyau-manchon

Foreword

This standard draft was drawn up by the study group Standardisation of Spring Band Clamps in the Standards Committee Iron, Sheet and Metalware (NA EBM).

DIN 3021

Hose clamps - spring band clamps (SBC) comprise:

Part 1: Dimensions, designation, materials

Part 2: Technical delivery conditions

Part 3: System: spring band clamp/hose/spigot

Annex A is for information.

Warning remarks about application

1 Field of application

This standard is applicable to hose/spigot connections with spring band clamps in accordance with DIN 3021-

1 and stipulates the dimensions and execution of hose and spigot.

2 References to standards

This standard contains dated or undated references, as well as definitions from other publications. Such references to standards are quoted in the pertinent passages in the text, and the publications are listed below. With dated references, subsequent amendments or revisions of these publications only belong to this standard if they are included by amendments or revisions.

With undated references the latest edition of the publication referred to shall be applicable.

DIN 3021-1

Hose clamps - spring band clamps - Part 1: Dimensions, marking, materials, types.

DIN 73411-1

Coolant water lines in vehicles; hoses and hose elbows;

Part 1: Dimensions, material, designation

DIN 73379-1

Fuel hoses – Part 1: Dimensions, material, designation

DIN 71550

Crimping for hose connections in pipelines

Other standards:

DIN 73411-2

Coolant water lines in vehicles; hoses and hose elbows;

Part 2: Requirements, testing

DIN 73379-2

Fuel hoses – Part 2: Requirements, testing

Normenausschu? Eisen-, Blech- und Metallwaren (NA EBM) im DIN

Deutsches Institut für Normung e.V.

To be cont. Pages 2 to 6

Page 2DIN 3021-3

3 System:

3.1 Spring band clamp/hose/spigot

Correct functioning of the spring band clamp/hose/spigot system assured by several characteristics that have been specifically matched to agree with each other:

? clamping forces

for the sealing effect including long-time function,? pull-off forces

to take up dynamic axial loads are to be tested on a case by case basis,? geometrical dimensions for safe assembling.

Minimum requirements are made on the geometry of the hoses and spigots to ensure leak-proofness in the system. To attain these minimum requirements, the dimensions, tolerances, mould offset, parting edge and waviness of the spigot and hose must be co-ordinated with each other.

Selection of the spigot form is dependent on the material and production procedure for the spigot.How the minimum requirements are co-ordinated is described below.3.2 Spigots for houses accordance with table 1Dimensions in millimetres

The spigots need not fall in line with the pictorial representation, only the dimensions specified having to be maintained

Form A 3)

(ideal form)

Figure 1:Cut metal spigots and plastic injection-moulded spigots

An example of how a spigot Form A with spigot diameter ds = 20 mm is entered on a drawing:

Form

see Page 4 for footnotes

L min 1)

?d w 2)

?d s

±3°

Page 3DIN 3021-3

Form B 3) 4)

Figure 2:Plastic spigot

Form C 3) 5)

Figure 3:Spigot form for beads on pipelines (similar to DIN 71 550)3.3 Spigot for fuel systems

Form D 3)

Figure 4: Only for hoses with di=7,3±0,2; p=3,5±0,3 and clamp DIN 3021 - B - 14x12see Page 4 for footnotes

±3°

R2,5

3.3 Hose

The hose dimensions specified in Table 1 correspond to DIN 73411-1 (Table 1) and DIN 73379-1(Table 1) 3.3.1 Minimum hose requirement

applies to both ends of the hose

Figure 5: Illustration - hose

1) In this area for forms A, B and C:

?Rmax = 50 μm

?W (waviness) + Rmax = max. 100 μm

w ave length min. 5 mm

?longitudinal scorings inadmissible

?Permissible out-of-roundness:0.2 mm for d s≤ 25

0.3 mm for d s >25

?admissible mould offset and parting edge:0.05 mm for d s≤ 20

0.1 mm for d s >20

2) The bead diameter is determined according to the following equations:

d s≤ 25:d w = d s × 1.12

d s >25 bis ≤ 37: d w= d s + 2.5

d s > 37:d w= d s + 3

3) Sharp edges are inadmissible.

4) For ds > 20 mm Form A is preferable when the pull-of f force is subject to more demanding requirements.

5) ds >20 mm is inadmissible.

6) Admissible mould offset and parting edge max. 0.04 mm. Only rounded raises are admissible.

7) Applicable for the push-on length > 28 mm is:

?longitudinal scorimgs are inadmissible.

?Admissible waviness 0.3 mm within ? of the circumference.

For testing, a test mandrel falling in line with the maximum internal diameter is to be inserted into the hose.

Table 1: Dimensions spring band clamp/hose/spigot

Dimensions in millimetres

Spring band clamp

Hose

Spigot

L min

internal diameter

external diameter

bead diameter

nominal diameter

d n minimal functional diameter

d f

d i limit dimens.

wall thickness

d s limit dimens

d w limit dimens

f+1

c=12c=15

1312,76,56,57,31413,78891514,78,58,59,61615,79,59,510,71716,3101011,21817,3111112,34,0

1918,3121213,52019,3131314,600,15

2120,31414± 0,2

15,7- 0,25

2221,315-0,53,5± 0,4

1516,82322,316-1

1618,02423,3171719,123

2524181820,22625191921,32726202022,42827212123,52928222224,53029232325,53231252527,56

3433262628,53534272729,5203635282830,50,3

383730-0,54± 0,530± 0,3

32,5403932-1,3

3234,54240,5343436,504341,5353537,5- 0,5

4442,5363638,54644,5373739,54745,53838414947,54040435048,54141445149,54242455351,54444475553,5464,5± 0,5464925

6058,55050537

6563,55555587068,560606307573,565-0,56568+0,5

8078,570-1,7

70738583,575757890

88,5

4 System mounting

The dimensions stipulated in Figures 7 and 8 are to be kept to for functional mounting of the spring band clamps.

The length of the connected hose can be limited visibly by marking the spigot, applying a coloured ring or mechanically with a hose stop.

(on the case or an additional ring)

Figure 7: Without hose stop Figure 8: With hose stop

Table 2: Spring band clamp – mounting intervals

Dimensions in millimetres

c=12c=15

from 13 to 40 4.0 4.0

as of 42 4.0 5.0

Annex A (for information)

Explanations and construction references

To obviate any danger of confusion when applied in adjacent mounting areas the user should select the nominal diameters in appropriate dimensions.

The following graduations apply, for example, to radiator systems in the automotive field:

Dimensions in millimetres

Hose di Spigot ds Spring band clamp dn

8.08.014

10.010.017

12.012.019

16.016.023

20.020.027

25.025.032

32.032.040

38.038.047

46.046.055