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Metric Bolt GradeMechanical Requirements for Carbon SteelExternally-Threaded Fasteners -- Metric SeriesPropertyClassDesignationNominalSize ofProductTensileMaterial andYieldTreatment Strength,N/mm2TensileUltimateStrength,N/mm2Prod. s IndentMarkingM5-M100low ormediumcarbon steel240400--B67B954.6M1.6M16low ormediumcarbon steel,fully orpartiallyannealed340420--B74B954.85.8M5-M24low ormediumcarbon steel,cold worked420520--B82B955.88.8M16-M724.64.8A325MType 1M16-M368.8A325MType 2M16-M36mediumcarbon steel,quenchedandtemperedlow carbonboron 8S8.866083030N56C23C34A325M8S
ered66083030N56C23C34A325M8S39.8mediumcarbon 9.89.8M1.6-M16low carbonboron steel,quenchedandtempered72090030n58C27C369.8M5 - M20mediumcarbon steel,quenchedandtempered940104030N59C33C3910.9M5 - M100mediumcarbon alloysteel,quenchedandtemperedA325MType 310.9M16-M3610.9A490MType 110.9A490MType 2M5 -M36M12 - M36low carbonboron 0M10S10.9940104030N59C33C39A490M10S
A490MType 312.9atmosphericcorrosionresistantsteel,M12 - M36quenchedandtemperedM1.6 M100alloy S1100122030N63C38C4412.9
SAE & ASTM Bolt GradeSAE & ASTM Bolt Grade Identification Marksand Mechanical PropertiesBolt GradeIdentification MarkingProof l Size(inch)SAE Grade 11/4 to 1 1/2227.5271413.68561/4 thru 3/4379.2118510.2122over 3/4 thru1-1/2227.5271413.6856ASTM A3071/4 to 1 1/2227.5271413.68563SAE Grade 41/4 to 1 1/2448.1594792.89742,aSAE - Grade 51/4 thru 1586.0546827.37121 1/8 thru 11/2510.2122723.94981 3/4 thru 3379.2118620.52841/4 thru 1586.0546827.3712SAE Grade 2ASTM A449-Type1SAE - Grade 5.2MaterialNotes12, b4, b
1/2 thru 1ASTM A325-Type11 1/8 to 11/21/2 thru 1586.0546827.37122, b510.2122586.0546723.9498827.3712ASTM A325 -Type 24,b1 1/8 to 11/2510.2122723.94981/2 thru 1586.0546827.3712ASTM A325 -Type 35,b1 1/8 to 11/2510.2122723.94981/4 thru 21/2723.9498861.845SAE Grade 75,b2-3/4 thru 4655.0022792.8974SAE Grade 71/4 to 1 1/2723.9498917.00317,bSAE - Grade 81/4 thru 11/2827.37121034.2147,bASTM A354 - GradeBD1/4 thru 11/2827.37121034.2146,b
ASTM A490 - Type 11/2 thru 11/2827.37121034.2146,bASTM A490 - Type 11/2 thru 11/2827.37121034.2146,bASTM A490 - Type 31/2 thru 11/2827.37121034.2145,bMaterial Notes1.2.3.4.5.6.7.Low or Medium Carbon SteelMedium Carbon SteelLow CarbonLow Carbon MartensiteWeathering SteelAlloy SteelMedium Carbon Alloya - cold drawnb - quenched and tempered
SAE Grade 2Tightening Torque (N.m)Bolt Size(in)TPIProof Load(KN)ClampLoad (KN)WaxedGalvPlain1/45/163/87/161/29/165/83/47/811 1/81 1/41 3/81 101475715274366951322352253394806788881180ASTM A449 / SAE Grade 5Tightening Torque (N.m)Bolt Size(in)TPIProof Load(KN)ClampLoad (KN)WaxedGalvPlain1/45/163/87/161/29/165/83/47/811 1/81 1/41 3/81 1/21 3/422 1/42 1/22 3/43201816141312111098776654 1/24 11263816694
ASTM A354 Grade BD / SAE Grade 8Tightening Torque (N.m)Bolt Size(in)TPIProof Load(KN)ClampLoad 1 1/81 1/41 3/81 1/21 3/422 1/42 1/22 3/433 1/43 1/23 3/44201816141312111098776654 1/24 487220337241253187141062518826446278773
ASTM A307Tightening Torque (N.m)Bolt Size(in)TPIProof Load(KN)ClampLoad (KN)WaxedGalvPlain1/45/163/87/161/29/165/83/47/811 1/81 1/41 3/81 1/21 3/422 1/42 1/22 3/433 1/43 1/23 3/44201816141312111098776654 1/24 14078177882210127040
ASTM A193 Grade B7Tightening Torque (N.m)Bolt Size(in)TPIProof Load(KN)ClampLoad (KN)WaxedGalvPlain1/45/163/87/161/29/165/83/47/811 1/81 1/41 3/81 1/21 3/422 1/42 1/22 3/433 1/43 1/23 3/44201816141312111098776654 1/24 92883637152469415832371357ASTM A325Tightening Torque (N.m)Bolt Size(in)TPIProof Load(KN)ClampLoad 4012641-31703491-4203
Torque (N.m) Lubricated. Plain. 1/4 20 17 13 8 16 5/16 18 28 21 16 34 3/8 16 41 31 29 60 7/16 14 57 43 47 95 1/2 13 76 57 71 145 9/16 12 97 73 104 209 5/8 11 121 90 144 287 3/4 10 178 134 255 510 7/8 9 247 185 411 822 1 8 323 242 616 1232 1 1/8 7 407 305 873 1745 1 1/4 7 534 400 1272 2542
