Recommended torque values installation torque values for circular electrical connector accessories shell sizes column 1 light and medium duty as50151 as31001 series mildtl26482 series i mildtl26500, mildtl27599 mildtl38999 series i and ii milc81511 series i, ii, iii and iv as81703 series i column 2 heavy duty as50151 as34001 series. The joint must demonstrate a separation factor of safety at limit load. Shear bolts are designed to fail under predetermined loads. In the case of bolts and nuts, this elastic deformation between the bolt head and the nut is critical in order to create tension or clamping force to hold the joint together.
An bolt torque for oil free cadmium plated steel nuts and bolts inch. Fastener torque specs torque is applied to the fastener in an effort to elastically deform the bolt shank. Always replace shear bolts with identical property class. You generate torque any time you apply a force using a wrench. Determining the correct torque can however present problems. The objective of this project is to define torque values for bolts and screws when loading is not a concern. Description this section contains information on the correct usage and identification of bolts, flat washers, lock washers, nuts, lock nuts, fittings and torque data. Fastener tech sheet, metric torque values grainger.
Values in this chart are advisory only, all applications vary. Plow bolts similar to carriage bolts but used for attaching the cutting edge of a plow to the plow blade. Torque values chart for common bolt sizes intpi1 n m2 ftlb3 n m ftlb n m ftlb mm x pitch4 n m ftlb n m ftlb n m ftlb 14 20 7. T the purpose of tightening screws is to fix one object to another object. Engineering fundamentals of threaded fastener design and. Remember, you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication. And grade g flange nuts lock nut standards from ifi100 requirements. Torque steel grade sae 5 sae 8 socket head cap screws property class 8. The following suggested tightening torques provide an excellent starting point for determining torque requirements. Threads per inch 307a astm a307 grade a sae j429 grade 5 sae j429 grade 8 f n l g 9 fnl grade 9 clamp load lbs. Bolt tightening table table 14 table 15 figure 21 1.
In addition, a proper bolt torque value can be inconsistent from fastenertofastener due to several factors including variations in material, coatings, surface finishes, fit tolerances, installation method, etc. Lubricated refers to fasteners in the as received condition, which is normally a light preservative oil coating on unplated fasteners and no oil coating on plated fasteners. Bolts with a smooth rounded head that has a small square section underneath. Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value. Select year 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967. Composite and noncomposites require different torque values. Technical information on fastener torque values used in the maintenance, repair or assembly of harleydavidson motorcycles. Ktorquefriction coefficient, d nominal bolt diameter, in and pbolt clamping load developed by tightening, lb.
Clamp loads estimated as 75% of proof load for specified bolts. When you use a wrench, you apply a turning force to the handle. Accepted formulae relating torque and tension, based on many tests are. Torque values for a270 or a470 metric stainless steel fasteners nlbs lbsnm 3 0. Hence, they should not be reused since cumulative deformations would lead to bolt rupture. Structural bolts such as astm a325 bolts are preloaded to 70% of ultimate tensile strength or about 90% of yield strength for slip critical connections and would yield during the torquing process. Suggested maximum torque values for screws and bolts. Bolts are new, standard finish, uncoated and not lubricated other than the normal protective oil film.
Ptfe coatings, lubrication, and assembly factors can alter these values. A guide to torque values it should be understood that the subject of torque tension loading is beyond the scope of this document. Bolts are graded by tensile strength and are easily identified by the number of slash marks on the head of the bolt. Tightening the lug nuts on the wheels of your car is a good example of torque. Criteria for preloaded bolts massachusetts institute of.
Installation torque tables for noncritical applications. The bolt torque table below provides information such as tension, torque, tpi for the heavy structured bolts against its corresponding bolt sizes ranging from 12 to 1 12. Astm a325 is an astm american society of the international association for testing and materials international standard for. Torque values for stainless steel and nonferrous fasteners.
For these reasons, it is not practical to provide a single bolt torque chart or. Clamp loads for grade c lock nuts equal 75% of the bolt proof loads specified for sae j429 grade 8, and astm a354 grade bd bolts. Bolts bolts can be identified by the markings located on the head of each bolt. Provides common workshop screw, bolt heads and nuts, tightening torque values for metric coarse and fine bolts, tensile strength comparison chart. Clamp load is also known as preload or initial load in tension on bolt. Rev 3409 torque values for stainless steel and nonferrous fasteners bolt silicon monel brass 2024t4 size dry lubricated dry lubricated bronze aluminum. Torque is applied to the fastener in an effort to elastically deform the bolt shank. Bolt tightening is controlled by specific torque value.
The nuts, bolts, and washers used on the airplane are in accordance with air force navy specifications, military specifications, and. Tightening torque values from the formula tkdp, where t tightening torque, ib. Values through 716 diameter are stated in inchpounds. Lubricate the bolts, nuts and nut bearing surfaces. View chart below, or click here to download in pdf format. The bolt efficiency will be low due to wide tolerance of the tension. Grainger approved fastener tech sheet, metric torque values. The bolt must have adequate strength reference paragraph 3. Bolt sizepitch lubricated with antiseize inlbs nm inlbs nm 61. Standard maintenance practice dictates that mechanics add this value to the specified torque.
Torque pronounced tork is a force that you use to rotate or turn things. Hex bolts the tightening torque values given in the above table serve only as a guide. Stud bolts bolting torque tables table 1 astm a193. Self locking nuts when torquing a selflocking nut, the nut should be run down on the threads of the bolt until the nut almost contacts the mating surface. Installation torque tables for noncritical applications nasatm2017219475 april 2017. These formulae may be used for bolts outside the range of the tables overleaf. Do not use these values if a different torque value or tightening procedure is given for specific application. If you are unsure of the proper torque value to use, here is a general chart of fastener torque values. When securing a fastener, use the torque specifications from the following tables. The amount of torque required to run the nut down friction drag. Torque values for a270 or a470 metric stainless steel. These bolts are categorized into three grades, grade a headed bolts, grade b headed.
Shear bolts are designed t fail under predetermined loads. Hex bolts carriage bolts lag bolts bolts with a hexagonal head with threads for use with a nut or tapped hole. The below estimated torque calculations are only offered as a guide. Lubricate all contact areas of the bolts and washers.
Recommended maximum bolt loads and torque values unc threads. Astm a325 is an astm american society of the international association for testing and materials international standard for heavy hex structural bolts. The amount of torque applied is a function of the frictional. Tightening torques for metric bolts of yield strength sy metrique diameter mm 6 8 10 12 14 16 18 20 22 24 27 30 33 36 39 42 45 48 52 56 60 64 68 m6 m8 m10 m12 m14 m16 m18 m20 m22 m24 m27 m30 m33 m36 m39 m42 m45 m48 m52 m56 m60 m64 m68 pitch mm 1 1. The astm a307 is an astm international standard for carbon steel bolts and studs ranging from 14 inches through 4 inches in diameter which is set by the standards organization astm international. A lubricated bolt requires less torque to attain the same clamping force as a nonlubricated bolt. This is a general guide only and gasket resources inc. Do not use these values if a different torque value or tightening procedure is given for a specific application. See figure 20601 when torquing fasteners which do not have a specific torque pattern called out, refer to the general torque patterns shown. It should be noted that these figures are based on the first tightening of single assemblies in isolation. The values shown in the chart are to be used as a midrange guideline. There is no torque difference for fine or coarse threads. Torque values for stainless steel and nonferrous fasteners bolt silicon monel brass 2024t4 size dry lubricated dry lubricated bronze aluminum. Recommended bolt torque table size recommended torque grade 2 grade 5 grade 8 188 ss bronze brass.
Stud bolts bolting torque tables table 1 astm a193 and. Given here is the bolt torque chart for the astm a307 bolts. Engineering fundamentals of threaded fastener design and analysis. Suggested assembly torque values the tapped hole or nut must have an equal or greater proof load than the studs minimum ultimate tensile strength. For use with threadednonthreaded fasteners, fastener ref. Fastener type chart bolt depot nuts and bolts, screws and. Visually examine and clean flanges, bolts, nuts and washers. Apply suitable axial tension it is best to do axial tension control for tightening screw, but actually it is difficult to measure. For more information or orders, call 225 2721703 or complete our quick quote form. Asme bolting assembly torque values forged components. Fastener type chart bolt depot nuts and bolts, screws. Bolt size, tpi, proof load lbs, clamp load lbs, tightening torque ft lbs. The importance of correct bolt tightening cannot be over emphasized.
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