Table 3 – Suggested Torque Values and ... - Nucor …

1 CAP SCREWSTECHNICAL DATA SHEETPO Box 6100 | St. Joe, Indiana 46785 | ph: (800) 955-6826 or (260) 337-1726 | fax: (260) 337-1726 | FASTENERN ucor Fastener is one of the largest manufacturers of Hex Head Cap Screws in the Cap Screws have been a serious business to us since we made our first cap screw back in 1986. Some manufacturers make cap screws when it s convenient, but, Nucor Fastener remains committed to the hex cap screw busi-ness. Nucor Fastener products are in assemblies across the , from tricycles to tractor trailers. When Sourcing for your assembly needs, Think Seriously about Nucor Fastener! Nucor Fastener Cap Screws are closely controlled to meet the dimensions of ASME (ANSI) Cap Screws are proportioned and toleranced to assure full and proper loading when assembled into a tapped hole. Unlike a standard bolt, a washer face is provided under the head to provide a bearing surface when tightened. Also unlike a standard bolts, which have much looser tolerances and allow the body to be larger than the nominal diameter, Cap Screws have a body which is never larger than the nominal diameter to ensure fit-up into tapped holes without counterboring.

2 The end of the Cap Screw is chamfered to aid in inserting into a tapped hole. Nucor Fastener Cap Screws are 100% Made in America from raw material melted and rolled in the They are cold formed on precision high speed formers, utilizing in-process qualitysystems, and have full traceability from raw material to each box shipped. Chemical and physical certifications are provided with every shipment, free of charge. Nucor Fastener has an A2LA Accredited laboratory and our Quality System is TS16949 and ISO9001 2-15-08 This Technical Data Sheet is subject to change without prior Grade 2 SAE Grade 5 SAE Grade 8 SAE J429 GRADE IDENTIFICATIONS uggested Torque ValuesAll Torque /tension relationships should be viewed with a cautious eye since no one Table can indicate the range of conditions expected to be experienced by a fastener. Torque is only an indirect indication of tension. The Torque value to use in an application is best obtained by using a calibrated Torque wrench (or transducer) and a Skidmore-Wilhelm type load indicating device to equate actual Torque to desired tension.

3 Nearly all of the Torque /tension tables which have been developed, including the one shown in Table 3, are based on the following formula:T=(k*d*P)/12 where T = Torque (ft-lbs), d = nominal diameter (inches), P = Tension (lbs), and k is the Torque coefficient or nut factor (dimensionless)The value of k is a dimensionless fudge factor which includes variables such as friction, thread conditions, etc. The value of k can range from for a well lubricated connection to greater than for a rusted assembly. Normally, k is approximately for plain steel (increase by about 10% for zinc plated and decrease by about 25% for parts which have been well lubricated). The torques shown below represent starting Values for plain capscrews (k = ) at 60% - 90% of the proof load tension: Table 3 Suggested Torque Values and Clamp Loads for SAE Grades 2, 5, & 8 Cap ScrewsNOMINAL DIAMETER AND TPI (INCHES)THREAD STRESS AREA (SQ-IN)SAE GRADE 2 SAE GRADE 5 SAE GRADE 8 CLAMP LOAD 60-90% PROOF (POUNDS)TIGHTENING Torque (FT-LBS)CLAMP LOAD 60-90% PROOF (POUNDS)TIGHTENING Torque (FT-LBS)CLAMP LOAD 60-90% PROOF (POUNDS)TIGHTENING Torque (FT-LBS)

4 1/4 - ,049 1,5744 71,622 2,4337 - 102,290 3,43410 141/4 - ,201 1,8025 - 81,856 2,7858 - 122,2621 3,93111 165/16 ,729 2,5949 142,672 4,00914 213,773 5,65920 295/16 ,914 2,87110 152,958 4,43715 234,176 6,26422 333/8 ,558 3,86816 243,953 5,92925 375,580 8,37035 523/8 ,897 4,34618 274,478 6,71728 426,322 9,48240 597/16 ,508 5,26226 385,421 8,13240 597,654 11,48056 847/16 ,917 5,87629 436,054 9,08144 668,546 12,82062 931/2 - ,683 7,02439 597,237 10,85560 9010,217 15,32585 1281/2 - ,277 7,91544 66 8,155 12,23268 10211,513 17,26996 1449/16 ,006 9,00956 849,282 13,92387 13113,104 19,656123 1849/16 ,699 10,04963 9410,353 15,53097 14614,616 21,924137 2065/8 ,458 11,18778 11711,526 17,289120 18016,272 24,408170 2545/8 ,448 12,67288 13213,056 19,584136 20418,432 - 27,648192 2883/4 - ,022 16,533138 20717,034 25,551213 31924,048 36,072301 4513/4 - ,309 18,464154 23119,023 28,535238 35726,856 40,284336 5047/8 ,246 22,869222 33423,562 35,343344 51533,264 49,896485 7287/8 ,797 25,196245 36725,959 38,939379 56836,648 54,972534 8021 ,998 29,997333 50030,906 46,359515 77343,632 65,448727 1,0911 ,407 33,611373 56034,629 51,944577 86648,888 73,332815 1,2221-1/8 ,179 37,769472 70833,877 50,816635 95354,936 82,4041,030 1,5451-1/8 ,248 42,372530 79438,006 57,010713 1,06961,632 92,4481,156 1,7331-1/4 ,977 47,966666 99943,024 64,535896 1,34469,768 104,6521,454 2,1801-1/4 - ,409 53,114738 1,10747,641 71,462993 1,48977,256 115,8841,610 2,414 TODAY, THAT LITTLE n MEANS BIG THINGS!

5 Nucor Fastener has the equipment, quality, systems, expertise, sources & people to meet your Hex Head Cap Screw Thread Series UNFT able 4 Dimensions of Hex Cap ScrewsFGHJEY (Ref)LTLBLGL(Ref)30 +0- 15 SAE vs. ASTM SpecificationsWith minor differences, SAE Grade Cap Screws have equivalent versions in ASTM standards. The Grade 2 Cap Screw is comparable to an ASTM A307 Grade A, the Grade 5 Cap Screw is the comparable to an ASTM A449 and the Grade 8 Cap Screw has the same strength as the ASTM A354 Grade BD. Our SAE Grade 8 and ASTM Grade BD Cap Screws are nearly identical, with the only exception being the ASTM required BD stamp on the head of the cap screw. Allowed steel chemistry is another difference, for example, SAE permits plain carbon 1541 grade steel for small diameter Grade 8 products, while ASTM A354 Grade BD requires alloy steel. Nucor Fastener only uses alloy steel for our Grade 8 Cap Screws. Required head mark differences are the primary reason that most grades can no longer be dual certified.

6 Recently, the ASTM A449 standard changed to a required A449 head mark from the SAE three radial lines head mark. Dimensions, mechanical properties and steel chemistry are still nearly identical, but, head marks aren t, ending the allowance for dual certification. Mechanical PropertiesThe mechanical properties of finished Cap Screws are covered in the Society of Automotive Engineers (SAE) J429, Mechanical and Material Requirements for Externally Threaded Fasteners Specification . This specification covers the materials, manufacturing methods, mechanical properties, and testing requirements for cap screws. Grade 2 (A307A) Cap Screws are low strength fasteners made from carbon steel, achieving their strength primarily from cold forming. Grade 5 (A449) Cap Screws are medium strength fasteners that achieve their strength from the medium carbon steel and a quench and temper heat treatment. Grade 8 Cap Screws (A354 GR BD) are high strength fasteners made from alloy steels that also achieve their strength from the alloy steel and a quench and temper heat treatment.

7 Standard mechanical tests are performed in our A2LA (American Association for Laboratory Accreditation) Accredited Screws can be used in tapped holes or with a nut (like a bolt). Most designs using Cap Screws, where a clamp load is specified, require the Cap Screw to be tightened to about 75% of the proof load to ensure a safe working range. The single shear strength of a Cap Screw is about 60% of the ultimate tensile strength times the shear area, so, working loads should be lower than this breaking strength. The fatigue strength of Cap Screws as measured by the endurance limit will vary widely depending upon the amplitude, frequency, and type of applied load. Endurance limits of 10-20% of the tensile strength have been reported for high strength Cap Screws.(ANSI ) E F G H I L Y THREAD LENGTH FOR RUNOUT OF NOMINAL SIZE OR WIDTH ACROSS WRENCHING SCREW LIGHTS TRANSITION BEARING BASIC PRODUCT BODY DIAMETER WIDTH ACROSS FLATS CORNERS HEIGHT HEIGHT THREAD SURFACE DIAMETER 6 IN.

8 AND OVER 6 IN. LENGTH FIM SHORTER MAX. MIN. BASIC MAX. MIN. MAX. MIN. BASIC MAX. MIN. MIN. BASIC BASIC MAX. MAX. 1/4 7 / 16 5/32 5/16 1 / 2 13/64 3/8 9 / 16 15/64 7/16 5 / 8 9/32 1/2 3 / 4 5/16 9/16 13/16 23/64 5/8 15/16 25/64 3/4 1-1/8 15/32 7/8 1-5/16 35/64 1 1-1/2 39/64 1-1/8 1-11/16 11/16 1-1/4 1-7/8 25/32 1-3/8 2-1/16 27/32 1-1/2 2-1/4 1-5/16 DIA OF PRODUCTS AND THREADS PER INCHSAE GRADE 2 SAE GRADE 5 SAE GRADE 8 PROOF LOAD, STRENGTH MIN, LOAD, STRENGTH MIN, LOAD, STRENGTH MIN, - 282,0002,7003,1004,3504,3505,4505/16 - 243,2004,3004,9006,9506,9508,7003/8 - 244,8006,5007,45010,50010,50013,2007/16 - 206,5508,80010,10014,20014.

9 20017,8001/ - 208,80011,80013,60019,20019,20024,0009/1 6 - 1811,20015,00017,30024,40024,40030,4005/ 8 - 1814,10018,90021,80030,70030,70038,4003/ 4 - 1620,50027,60031,70044,80044,80056,0007/ 8 - 1416,80030,50043,30061,10061,10076,4001 - 1221,90039,80056,40079,60079,60099,4001 - 14 uns22,40040,70057,70081,50081,500101,900 1-1/8 - 1228,20051,40063,30089,900102,700128,400 1-1/4 - 1235,40064,40079,400112,700128,800161,00 01-3/8 - 1243,40078,90097,300138,100157,800197,20 01-1/2 - 1252,20094,900117,000166,000189,700237,2 00 Table 2 SAE J429 Proof Load and Tensile Strength Requirements Coarse Thread Series UNCNOMINAL DIA OF PRODUCTS AND THREADS PERINCHSAE GRADE 2 SAE GRADE 5 SAE GRADE 8 PROOF LOAD, STRENGTH MIN, LOAD, STRENGTH MIN, LOAD, STRENGTH MIN, - 201,7502,3502,7003,8003,8004,7505/16 - 182,9003,9004,4506,3006,3007,8503/8 - 164,2505,7506,6009,3009,30011,6007/16 - 145,8507,8509,05012,80012,80015,9001/2 - 137,80010,50012,10017,00017,00021,3009/1 6 - 1210,00013,50015,50021,80021,80027,3005/ 8 - 1112,40016,70019,20027,10027,10033,9003/ 4 - 1018,40024,70028,40040,10040,10050,1007/ 8 - 915,20027,70039,30055,40055,40069,3001 - 820,00036,40051,50072,70072,70090,9001-1 /8 - 725,20045,80056,50080,10091,600114,4001- 1/4 - 732,00058,10071,700101,700116,300145,400 1-3/8 - 638,10069,30085,500121,300138,600173,200 1-1/2 - 646,40084,300104,000147,500168,600210,80 0* Proof Load Testing applies only to stress relieved products of this grade.

10 Consult SAE J429 or Nucor Technical Personnel for more information.** For bolts & screws 6 or shorter in length. Grade 1 requirements apply to parts longer than 6 . Table 1 Mechanical Properties of SAE J429 Cap ScrewsSAE GRADESIZEPROOF STRESS (PSI)TENSILE STRESS MIN. (PSI)SURFACE HARDNESS HR3ON HARDNESS ROCKWELL21/4 - 3/4"*74,000N/A80 - 100**HRbOver 3/4"*60,000N/A70 - 100 HRb51/4 - 185,000120,0005425 - 34 HRCOver 1 - 1-1/2"74,000105,0005019 - 30 HRC81/4 - 1-1/2"120,000150, - 39 HRCCAP SCREWSTECHNICAL DATA SHEETPO Box 6100 | St. Joe, Indiana 46785 | ph: (800) 955-6826 or (260) 337-1726 | fax: (260) 337-1726 | FASTENERN ucor Fastener is one of the largest manufacturers of Hex Head Cap Screws in the Cap Screws have been a serious business to us since we made our first cap screw back in 1986. Some manufacturers make cap screws when it s convenient, but, Nucor Fastener remains committed to the hex cap screw busi-ness. Nucor Fastener products are in assemblies across the , from tricycles to tractor trailers.