{"id":86,"date":"2026-06-15T18:42:41","date_gmt":"2026-06-15T18:42:41","guid":{"rendered":"https:\/\/structp.eu\/?page_id=86"},"modified":"2026-06-17T19:37:22","modified_gmt":"2026-06-17T19:37:22","slug":"bolts","status":"publish","type":"page","link":"https:\/\/structp.eu\/?page_id=86","title":{"rendered":"Bolts"},"content":{"rendered":"\n

This page is still under construction!<\/h4>\n\n\n\n

Nominal yield strength f<\/em>yb<\/sub> and ultimate tensile strength f<\/em>ub<\/sub> according to EN1993-1-8 Table 3.1<\/strong><\/h3>\n\n\n\n
Bolt
class<\/td>		4.6<\/strong><\/td>4.8<\/strong><\/td>5.6<\/strong><\/td>5.8<\/strong><\/td>6.8<\/strong><\/td>8.8<\/strong><\/td>10.9<\/strong><\/td><\/tr>
f<\/strong><\/em>yb<\/strong><\/sub> (MPa)<\/td>240<\/td>320<\/td>300<\/td>400<\/td>480<\/td>640<\/td>900<\/td><\/tr>
f<\/strong><\/em>ub<\/strong><\/sub> (MPa)<\/td>400<\/td>400<\/td>500<\/td>500<\/td>600<\/td>800<\/td>1000<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Nominal values for strength follow a simple mnemonic: <\/p>\n\n\n\n

If bolt class is X.Y then f<\/em>yb<\/sub> = X * Y * 10 <\/strong>and <\/em>f<\/em>ub<\/sub> = X * 100<\/strong>. <\/p>\n\n\n\n

Y is the ratio f<\/em>yb<\/sub> \/ f<\/em>ub<\/sub><\/strong> .
<\/p>\n\n\n\n

Main properties of metric hexagonal bolts<\/strong><\/h3>\n\n\n\n
Size<\/td>Nominal
diameter
d
mm<\/td>		Width
across
flats
s
mm<\/td>		Gross area
Ag<\/sub>
mm2<\/sup><\/td>		Stress area
As<\/sub>
mm2<\/sup><\/td><\/tr>
M8<\/td>8<\/td>13<\/td>50.3<\/td>36.6<\/td><\/tr>
M10<\/td>10<\/td>16<\/td>78.5<\/td>58.0<\/td><\/tr>
M12<\/td>12<\/td>18<\/td>113<\/td>84.3<\/td><\/tr>
M14<\/td>14<\/td>21<\/td>154<\/td>115<\/td><\/tr>
M16<\/td>16<\/td>24<\/td>101<\/td>157<\/td><\/tr>
M18<\/td>18<\/td>27<\/td>254<\/td>192<\/td><\/tr>
M20<\/td>20<\/td>30<\/td>314<\/td>245<\/td><\/tr>
M22<\/td>22<\/td>34<\/td>380<\/td>303<\/td><\/tr>
M24<\/td>24<\/td>36<\/td>452<\/td>353<\/td><\/tr>
M27<\/td>27<\/td>41<\/td>573<\/td>459<\/td><\/tr>
M30<\/td>30<\/td>46<\/td>707<\/td>561<\/td><\/tr>
M33<\/td>33<\/td>50<\/td>855<\/td>694<\/td><\/tr>
M36<\/td>36<\/td>55<\/td>1020<\/td>817<\/td><\/tr>
M39<\/td>39<\/td>60<\/td>1190<\/td>976<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Nominal clearances for bolts and pins<\/strong> according to EN1090-2<\/strong><\/h3>\n\n\n\n
Size<\/td>Normal
round holes
mm
a<\/sup>
<\/td>		Oversize
round holes
mm

<\/td>
Short
slotted holes
(on the length)
mm
d<\/sup>
<\/td>		Long
slotted holes
(on the length)
(1.5d)
mm
d<\/sup>
<\/td><\/tr>
M12<\/td>1b,c<\/sup><\/td>3<\/td>4<\/td>18<\/td><\/tr>
M14<\/td>1b,c<\/sup><\/td>3<\/td>4<\/td>21<\/td><\/tr>
M16<\/td>2<\/td>4<\/td>6<\/td>24<\/td><\/tr>
M18<\/td>2<\/td>4<\/td>6<\/td>27<\/td><\/tr>
M20<\/td>2<\/td>4<\/td>6<\/td>30<\/td><\/tr>
M22<\/td>2<\/td>4<\/td>6<\/td>33<\/td><\/tr>
M24<\/td>2<\/td>6<\/td>8<\/td>36<\/td><\/tr>
M27<\/td>3<\/td>8<\/td>10<\/td>40.5<\/td><\/tr>
M30<\/td>3<\/td>8<\/td>10<\/td>45<\/td><\/tr>
M33<\/td>3<\/td>8<\/td>10<\/td>49.5<\/td><\/tr>
M36<\/td>3<\/td>8<\/td>10<\/td>54<\/td><\/tr>
M39<\/td>3<\/td>8<\/td>10<\/td>97.5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Notes:<\/p>\n\n\n\n

a) For applications such as towers and masts the nominal clearance for normal round holes shall be reduced by 0,5 mm unless otherwise specified<\/p>\n\n\n\n

b) For coated fasteners, 1 mm nominal clearance can be increased by the coating thickness of the fastener.<\/p>\n\n\n\n

c) Bolts with nominal diameter 12 and 14 mm, or countersunk bolts may also be used in 2 mm clearance holes under conditions
given in EN 1993-1-8.<\/p>\n\n\n\n

d)For bolts in slotted holes the nominal clearances across the width shall be the same as the clearances on diameter specified
for normal round holes.<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

This page is still under construction! Nominal yield strength fyb and ultimate tensile strength fub according to EN1993-1-8 Table 3.1 Bolt class 4.6 4.8 5.6 5.8 6.8 8.8 10.9 fyb (MPa) 240 320 300 400 480 640 900 fub (MPa) 400 400 500 500 600 800 1000 Nominal values for strength follow a simple mnemonic: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-86","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/structp.eu\/index.php?rest_route=\/wp\/v2\/pages\/86","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/structp.eu\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/structp.eu\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/structp.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/structp.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=86"}],"version-history":[{"count":12,"href":"https:\/\/structp.eu\/index.php?rest_route=\/wp\/v2\/pages\/86\/revisions"}],"predecessor-version":[{"id":122,"href":"https:\/\/structp.eu\/index.php?rest_route=\/wp\/v2\/pages\/86\/revisions\/122"}],"wp:attachment":[{"href":"https:\/\/structp.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}