ISO Metric Pitch Thread Proof Loads

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The table below shows proof loads for bolts, nuts and studs with an ISO metric coarse and fine pitch thread in sizes M3 to M39.

According to EN ISO 898-1.

Threada dNominal Stress Area As,nomb mm2Property Class
4.64.85.65.86.88.89.810.912.9/12.9
Proof Load, Fp (As,nom x Sp,nom), N
M35,03113015601410191022102920327041804880
M3,56,78153021001900258029803940441056306580
M48,78198027202460334038605100571072908520
M514,232004400398054006250823092301180013800
M620,14520623056307640884011600131001670019500
M728,9650089608090110001270016800188002400028000
M836,68240 c1140010200 c139001610021200 c2380030400 c35500
M105813000 c1800016200 c220002550033700 c3770048100 c56300
M1284,3190002610023600320003710048900 d548007000081800
M14115259003560032200437005060066700 d7480095500112000
M16157353004870044000597006910091000 d102000130000152000
M181924320059500538007300084500115000-159000186000
M2024555100760006860093100108000147000-203000238000
M22303682009390084800115000133000182000-252000294000
M243537940010900098800134000155000212000-293000342000
M27459103000142000128000174000202000275000-381000445000
M30561126000174000157000213000247000337000-466000544000
M33694156000215000194000264000305000416000-576000673000
M36817184000253000229000310000359000490000-678000792000
M39976220000303000273000371000429000586000-810000947000
Thread d x PNominal Stress Area As,noma mm2Property Class
4.64.85.65.86.88.89.810.912.9/12.9
Proof Load, Fp (As,nom x Sp,nom), N
M8x139,288201220011000149001720022700255003250038000
M10x1,2561,2138001900017100233002690035500398005080059400
M10x164,5145002000018100245002840037400419005350062700
M12x1,588,1198002730024700335003880051100573007310085500
M12x1,2592,1207002860025800350004050053400599007640089300
M14x1,512528100388003500047500550007250081200104000121000
M16x1,5167376005180046800635007350096900109000139000162000
M18x1,52164860067000605008210095000130000-179000210000
M20x1,5272612008430076200103000120000163000-226000264000
M22x1,53337490010300093200126000146000200000-276000323000
M24x238486400119000108000146000169000230000-319000372000
M27x2496112000154000139000188000218000298000-412000481000
M30x2621140000192000174000236000273000373000-515000602000
M33x2761171000236000213000289000335000457000-632000738000
M36x3865195000268000242000329000381000519000-718000839000
M39x31030232000319000288000391000453000618000-855000999000

a Where no thread pitch is indicated in a thread designation, coarse pitch is specified.

b To calculate As,nom, see 9.1.6.1.

c For fasteners with thread tolerance 6az in accordance with ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply.

d For structural bolting 50 700 N (for M12), 68 800 N (for M14) and 94 500 N (for M16).

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