Translation DIN 3021-3
Part 3: System: Spring band clamp – Ho - Nipple
This norm was created out by working team …Schelle“ of the Ferro- and Metalpart (NA EBM) team.DIN 3021
Ho Clamps – Spring Band Clamps (FBS) existing of:
Part 1: Dimensions, Marks, Material, Versions
Part 2: Technical supply conditions
Part 3: System: Spring Band Clamp – Ho – Nipple
1. Using area
This Norm is valid for Ho – Nipple connections wit h Spring Band Clamps (FBS)according t o DIN 3021-1 and commi t dimensions and versions for Hos and Nipples.
2. Norm Links This norm consist dat ed or undat ed links of other publishing. This links are marked dur
ing the text and the publishing are listed follow. At dated links later changings or overworks of that publishings are only included in t his norm if changings or overworks are fitted in this norm.For undated links the latest version is valid.DIN 3021-1
Ho clamps – Spring band clamps (FBS) –Part 1: Dimensions, Marks, Material, Versions DIN 71550
Beads for hos and pipe connections DIN 73379-1
Fuel hos – Part 1: Dimensions, Material,Marks
DIN 73411-1
Coolant hos in cars – hos and ho bows –Part 1: Dimensions, Material, Marks
Further Norms:
DIN 73379-2
Fuel hos – Part 2: Demands, Tests
DIN 73411-2
星巴克咖啡粉Coolant hos in cars – hos and ho bows –Part 2: Demands, Tests
3. System
3.1 Spring band clamp – ho – nipple
The correct function of the system spring band clamp – ho – nipple is cured by various,harmonized properties:
- Forces
for the aling and long term function - Pull off force
for t
he compensa t
ion of dynamic axial loads (to be tested single wi)- geometric Dimensions for asmbly safety 3.2 Nipples and Hos acc. table 1Dimensions in mm
The hos don’t need t o mat ch t he pict ures;only t he men t ioned dimensions have t
o be fulfilled
Continue page 2 to 5
Form A 3)
(Ideal Form)
Picture 1: machined metal nipple and injection plastic moulded nipple Marking of a nipple type Form A with a nipple diameter of d s = 20mm:
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Name
Form所望
Form B 3) 4)
Picture 2: Plastic nipple
Form C 3) 5)
Picture 3: Nipple form for beads at pipe connections (similar DIN 71550) Footnote e page 3
3.3 Nipple for fuel systems
Form D 3)内森黑尔
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Picture 4: Nipple for fuel systems
Only for hos with di = 7,3 ± 0,2; p = 3,5 ± 0,3 and clamp DIN 3021 – B – 14 x 12
3.4 Ho
The in table 1 listed ho dimensions correspond table 1 of DIN 73411-1 : 1996-10 and table 1 of DIN 73379-1 : 1997-11.
Picture 5: Ho
1) In this area for forms A, B and C:
-R max = 50 λm
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-W (wavy) + R max = max. 100 λm
-Wave length min. 5mm
-No alongside scores allowed
本草纲目英语
-Allowed out of roundness: 0,2mm for d s• 20
0,3mm for d s > 20
-- Allowed form misalignment and division burr:0,05mm for d s• 20
0,1mm for d s > 20
2) The bead diameter is calculated by following formula:
d s• 25:d w = d s x 1,12
d s 25 to • 37:d w = d s + 2,5
d s > 37:d w = d s + 3
3) Sharp edges not allowed.
4) For d s > 20mm is form A preferred if higher demands at pull off force is requested.
5)d s > 20mm not allowed.
6) Allowed form misalignment and division burr max. 0,04mm. Only rounded rais allowed.
7) For plug on length of minimum 28mm valid:
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-No alongside scores allowed;
buddhist-Allowed wavy 0,3mm in between ¼ of the periphery;
For the test a mandrel, which correspond to the maximum inside diameter of ho, shoved in.
-Dimensions and tolerances acc. to table 1.
Table 1: Dimensions spring band clamp – ho – nipple
Dimensions in mm
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4. System asmbly
For a function - like spring band clamp asmbly the dimensions acc. picture 6 and 7 must be fulfilled.
The limit of the ho push on length can be marked visually by marking on the nipple as well as lay on a colour ring or mechanical, with help of a ho stop.
Picture 6: Asmbly without ho stop Picture 7: Asmbly with ho stop
Table 2: Spring band clamp – asmbly distances
Appendix A (information only)
Explanations and construction hints
To avoid confound of spring band clamps in neighbour asmbly areas t he ur is request ed t o choo t he nominal sizes in sufficient distances.
As example for the car cooling following steps are applied:
