Iso Recommen: Dation

UDC 621.882.215

Ref. No. : ISO/R 1580-1970 (E)

IS0 I NTERN AT1 O N A L O RG A N I Z A T l O N F O R STA N D A R D l Z A T l ON

IS O R E C O M M EN DATI O N

R 1580 SLOTTED PAN HEAD SCREWS METRIC SERIES

1st EDITION --`````,,,,,,```,````,,`,```,`,-`-`,,`,,`,`,,`---

June 1970

COPYRIGHT RESERVED The copyright of IS0 Recommendations and IS0 Standards belongs to I S 0 Member Bodies. Reproduction of these documents, in any country, may be authorized therefore only by the national standards organization of that country, being a member of ISO.

For each individual country the only valid standard is the national standard of that country.

Printed in Switzerland Also issued in French and Russian. Copies to be obtained through the national standards organizations.

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-3-

B R I E F HISTORY

The IS0 Recommendation R 1580, Slotted pan head screws - Metric series, was drawn up by Technical Committee ISO/TC 2, Bolts, nuts and accessories, the Secretariat of which is held by the Deutscher Normenausschuss (DNA). Work on this question led to the adoption of Draft IS0 Recommendation No. 1580,which was circulated to ail the IS0 Member Bodies for enquiry in July 1968. It was approved, subject to a few modifications of an editorial nature, by the following Member Bodies : Austria Belgium Brazil Canada Czechoslovakia Denmark Finland Germany Hungary India

Israel Italy Japan Korea, Rep. of Netherlands New Zealand Norway Poland Portugal Romania

South Africa, Rep. of Spain Sweden Switzerland Thaiiand Turkey U.A.R. United Kingdom U.S.A. U.S.S.R.

The following Member Body opposed the approval of the Draft : France This Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided to accept it as an IS0 RECOMMENDATION.

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ISO/R 1580-1970 (E

-5-

IS0 Recommendation

R 1580

June 1970

SLOTTED PAN HEAD SCREWS METRIC SERIES

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1. SCOPE

This IS0 Recommendation specifies dimensions of slotted pan head screws of the metric series and provides a system of standard lengths, i.e. recommended combinations of thread size, thread length and nominal length.

2. DIMENSIONS

Principal dimensions are given in Table 1, page 6 . (Nominal lengths and thread lengths are given in section 3.) The thread sizes in parentheses should be avoided if possible. NOTE. - According to the type of manufacturing process used, screw cutting or die-casting, the shape of the head may be cylindrical or tapered with a conicity of up to 5'.

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ISO/R 1580-1970 (E)

-6-

B

shank diameter %pitch diameter

U

shank diameter

TABLE 1

-

% major

diameter

Principal dimensions Dimensions in millimetres

Thread

ID Ik

d h14

1 6

I

h13

1.5

Nominal value

0.6

0.8

max.

0.80

1 .O0

min.

0.66

O.86

min.

0.6

n

le t

ma.

I

1.8

1 0.8 1 1

0.72

min.

0.84

0.96

RI

min.

0.1

0.2

R2

max.

1.4

1.6

da

ma.

4.1

4.7

a

max.

0.9

I

1

1.2

I

1.4

NOTE. - For tolerance and symbols see IS0 Recommendation R 286,150 System of limits and fits tolerances and deviations. --`````,,,,,,```,````,,`,```,`,-`-`,,`,,`,`,,`

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~

Part I : General.

-7-

ISO/R 1580-1970 (E)

3. STANDARD LENGTHS

Standard lengths, i.e. recommended combinations of thread size, thread length and nominal length, should be selected from those given in Table 2 , below. The standard lengths are those between the heavy stepped lines. Screws with nominal lengths above the stepped line marked thus, - - - -,are threaded up to the head. Nominal lengths in brackets should be avoided if possible. TABLE 2 - Standard lengths Dimensions in millimetrl

Nominai lengths

Thread size d

I 2.5

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I

14

I

I

70

I

I

1O0

I

Thread length

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18

(4.5)

t

22

24

25

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28

34

40

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Date of the first printing

Price based on 3 pages

:

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