Torque chart for metric bolts pdf
Torque chart for metric bolts pdf
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Title: metric bolts, screws & nuts: tightening torques author: fastener mart created date: 10: 22: 23 pm. 9 torque ( nm) torque ( ft- lbs) caution: all material included in this chart is advisory only, and its use by anyone is voluntary. Torque for metric fasteners 70% of minimum yield strength bolts metric normal din 13 friction value 0. Grade 8 hex head.
20load ( lbs) eco- guard = 0. The classes are set by the international standards organisation or iso. 307a threads per inchsae j429 grade 5sae j429 grade 8hk holo- krome g9 grade 9tightening nominaldia. Torque- tension reference guide torque- tension relationship for a307a, grade 5, 8 & 9 bolts 5. Clamp threads per inch tightening torqueclamp tightening torque astm a307 grade a tightening torqueload( lbs) eco- quard threads per inch = 0. 6 carbon steel, m16 fully or partially annealed 5. Ins or for metric sizes: = p x d 5000 = torque n.
Fastener torque charts guide for prevailing- torque lock nut assembly torques ( cad and wax, grade b, c, and grade g flange nuts) lock nut standards from ifi- 100 requirements torque- tension requirements grade c grade b grade g clamp loads for the grade b lock nuts equal 75% of the bolt proof loads specified for sae j- 429 grade 5, and astm a- 449. Torque values listed in foot- pounds. Torque chart - metric plain and zinc plated hex head and socket head cap. 9 bolts for both wet and dry tightening. Black oxide bolts, shc.
Torque values calculated from formula t= kdf where; k= 0. Torque ( nm) torque ( ft- lbs) iso 898- 1 property class 8. M = bolt tension newtons. 20 for plain and dry condition caution: all material included in this chart is advisory only, and its use by anyone is voluntary. Formulae accepted formulae relating torque and tension, based on many tests are: = p x d 60 = torque lbf.
Unified coarse thread seriesfine thread seriesbasicscrew dia. In developing this information, fastenal has made a determined effort to present its contents accurately. Astm a574 - ansi b18. Ft = bolt tension lbf = bolt dia. 8 torque ( ft- lbs) iso 898- 1 property class 10.
Example: bolt and nut are both phosphated; required torque = torque recommended x 0. These metric bolt torque charts show the ideal tightening torque for class 8. Bending calculator get instant quote metric bolt torque chart maximum tightening torques for coarse threaded metric bolts property classes ( grades) are defined by iso 898 ( mechanical properties of fasteners made of carbon steel and alloy steel). 15 for " lubricated" condition, k= 0. 17 for zinc plated and dry condition ( or as- received for the 12.
8 b95 property class indent marking 4. Material and treatment low or medium carbon steel tensile yield strength, n/ mm2 240 tensile ultimate strength, n/ mm2 400 surface, max prod. 6 low or mediumb74 b95 4. The bolt’ s class indicates its material strength, with higher numbers meaning higher tensile and yield strength. Hardness, rockwell core min max - - b67 4. 14 8, 8 10, 9 12, 9 metric threads a/ f torque = ma pv m2 4 863 m2, 3 4, 5 1245 m2, ma nm pv ma nm.