Proof Loads for Fasteners

Proof Loads For Screws
ISO Metric (Coarse) Threads ISO 898/I-1988

Nominal Diameter Of Thread d(mm)Pitch
P(mm)
Nomincal Stress Area
As (mm2)
Property Class
3.64.64.85.65.86.88.89.810.912.9
Proof Load (As . Ap),N
30.505.03910113015601410191022102920327041804880
3.50.606.781220153021001900258029803940441056306580
40.708.781580198027702460334038605100571072908520
50.8014.20256032004400398054006250823092301180013800
61.0020.1036204520623056307640884011600131001670019500
71.0028.905200650089208090110001270016800188002400028000
81.2536.60659082401140010200139001610021200238003040035500
101.5058.0010400130001800016200220002550033700377004810056300
121.7584.30152001900026100236003200037100489001)548007000081800
142.00115207002590035600322004370050600667001)7480095500112000
162.00157283003530048700440005970069100910001)102000130000152000
182.5019234600432005950053800730008450011500 159000186000
202.502454410055100760006860093100108000147000 203000238000
222.5030354500682009390084800115000133000182000 252000294000
243.00353635007940010900098800134000155000212000 293000342000
273.0045982600103000142000128000174000202000275000 381000445000
303.50561101000126000174000157000213000247000337000 466000544000
333.50694125000156000215000194000264000305000416000 570000673000
364.00817147000184000253000229000310000359000490000 678000792000
394.00976176000220000303000273000371000429000586000 810000947000
1)For structural steel screws 50700,68800 and 94500 N

Proof Loads For Screws
ISO Metric (Fine) Threads ISO 898/I-1988

Nominal Diameter Of Thread d(mm)Pitch
P(mm)
Nomincal Stress Area
As (mm2)
Property Class
3.64.64.85.65.86.88.89.810.912.9
Proof Load (As . Ap),N
81.0039.2706088201220011000149001720022700255003250038000
101.2561.211000138001900017100233002690033500398005080059400
121.2592.116600207002860025800350004050053400599007630089300
141.501252250028100388003500047500550007250081200104000121000
161.5016730100276005180046800635007350096900109000139000162000
181.50216389004860067000605008210095000130000 179000210000
201.5027249000612008430076200103000120000163000 226000264000
221.50333599007490010300093200126000146000200000 276000323000
242.003846910086400119000108000146000169000230000 319000372000
272.0049689300112000154000139000188000218000298000 412000481000
302.00621112000140000192000171000236000273000373000  515000602000
332.00761137000171000236000213000289000335000457000 632000738000
363.00865156000195000268000242000329000381000519000 718000838000
393.001030185000232000319000288000391000453000618000 855000999000

Proof Loads For Nuts (Coarse Thread)
According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Thread
Size
Pitch
P(mm)
Nominal Stress Area of Test Mandrel As mm2Property Class
45681012
Proof Load (As * Sp), in N
M3 0.505.03 25003000400050006000
M3.5 0.606.78 34004050540068008150
M4 0.708.78 440052507000875010500
M5 0.8014.2 71008500114001140017000
M6 1.0020.1 1000012000160002000024000
M7 1.0028.9 1450017300230002900034700
M8 1.2536.6 1830022000290003650043000
M10 1.5058.0 2900035000460005800069500
M121.7584.5 42100505006700084000100000
M14 2.00115 575006900092000115000138000
M16 2.00157 7850094000126000157000188000
M18 2.501927680096000115000154000192000230000
M20 2.5024598000122000147000196000245000294000
M22 2.50303121000151000182000242000303000364000
M24 3.00353141000176000212000282000353000423000
M27 3.00459184000230000276000367000459000550000
M30 3.50561224000280000336000448000561000673000
M33 3.50694277000347000416000555000694000833000
M36 4.00817327000408000490000653000817000980000
M39 4.009763900004880005850007800009760001170000
The above proof loads are also valid for nuts where the property class marking is enclosed by two vertical lines |8|
Conversion Factor: 1N = 0.2248 lb.

Proof Loads For Nuts (Fine Thread)
According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Thread
Size
Pitch
P(mm)
Nominal Stress Area of Test Mandrel As mm2Property Class
5681012
Proof Load (As * Sp), in N
M81.0039.21960023500310003900047000
M101.0064.53220038700515006450077500
M101.2561.23060037000490006100073500
M121.2592.146000550007400092000110000
M121.5088.144000530007000088000106000
M141.501256220075000100000125000150000
M161.5016783500100000134000167000200000
M181.50216108000129000173000216000259000
M182.00204102000122000163000204000245000
M201.50272136000163000218000272000326000
M202.00258129000155000206000258000310000
M221.50333166000200000266000333000400000
M222.00318159000191000254000318000382000
M242.00384192000230000307000384000460000
M272.00496248000298000397000496000595000
M302.00621310000373000497000621000745000
M332.00761380000456000608000761000914000
M363.008654320005190006920008650001040000
M393.00103050100061800082500010300001240000
The above proof loads are also valid for nuts where the property class marking is enclosed by two vertical lines |8|
Conversion Factor: 1N = 0.2248 lb.

*All information is strictly informative