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| Mechanical Properties of Alloy Steel Socket Head Cap Screws - Blue Devil® | |||||||
| Nominal Size | Tensile Strength (lbs., min.) | Yield Strength (lbs., min.) | Body Section | Tightening Torque (In-Lbs) | |||
| UNRC | UNRF | UNRC | UNRF | Single Shear Strength (lbs.-min) |
UNRC | UNRF | |
| 0 | - | 320 | - | 290 | 305 | - | 2.6 |
| 1 | 475 | 500 | 425 | 450 | 450 | 4.5 | 4.8 |
| 2 | 665 | 710 | 600 | 635 | 625 | 7.5 | 8.0 |
| 3 | 875 | 940 | 790 | 845 | 830 | 11.0 | 12.0 |
| 4 | 1,090 | 1,190 | 975 | 1,070 | 1,060 | 16.0 | 18.0 |
| 5 | 1,430 | 1,490 | 1,290 | 1,345 | 1,325 | 24.0 | 24.0 |
| 6 | 1,640 | 1,825 | 1,470 | 1,645 | 1,615 | 30.0 | 34.0 |
| 8 | 2,250 | 2,650 | 2,270 | 2,385 | 2,280 | 55.0 | 58.0 |
| 10 | 3,150 | 3,600 | 2,835 | 3,240 | 3,060 | 79.0 | 90.0 |
| 1/4 | 5,725 | 6,550 | 5,150 | 5,900 | 5,295 | 200.0 | 230.0 |
| 5/16 | 9,430 | 10,440 | 8,490 | 9,395 | 8,285 | 415.0 | 460.0 |
| 3/8 | 13,950 | 15,805 | 12,555 | 14,225 | 11,910 | 740.0 | 845.0 |
| 7/16 | 19,135 | 21,365 | 17,220 | 19,230 | 16,200 | 1190.0 | 1305.0 |
| 1/2 | 25,540 | 28,780 | 22,990 | 25,905 | 21,175 | 1800.0 | 2065.0 |
| 5/8 | 38,400 | 43,500 | 34,550 | 39,150 | 31,300 | 3400.0 | 3800.0 |
| 3/4 | 56,750 | 63,400 | 51,100 | 57,050 | 45,050 | 6000.0 | 6750.0 |
| 7/8 | 78,500 | 86,500 | 70,700 | 77,850 | 61,350 | 8250.0 | 9200.0 |
| 1 | 103,000 | 112,700 | 92,700 | 101,450 | 80,100 | 12500.0 | 13000.0 |
| 1-1/4 | 164,700 | 182,400 | 148,250 | 164,150 | 125,100 | 25000.0 | 27750.0 |
| 1-1/2 | 238,800 | 268,800 | 215,950 | 241,900 | 180,200 | 43500.0 | 49000.0 |
| Description | An externally threaded fastener with unified threads, a cylindrical head with flat chamfered top surface, knurled cylindrical sides and hexagonal recess, made from alloy steel. |
| Applications/ Advantages |
Ideal for precision assembly work with close tolerances and applications needing a well tooled appearance. Supplies greater tensile strength than equivalent sizes of Grade-5 or Grade-8 hex head cap screws while requiring less surface area or counterbore since the fastener is internally wrenched. |
| Material | Cap Screws shall be made from an alloy steel which conforms to the following chemical composition requirements (per product analysis) - Carbon: 0.31% minimum, Phosphorus: 0.04% maximum, Sulfur: 0.045% maximum, Also one or more of the following elements shall be presentin sufficient quantity to meet the strength requirements listerd below: chromuim, nickel, molybdenum or vanadium. |
| Heat Treatment | Cap Screws shall be heat treated by oil quenching from above the transformation temperature and then tempered at a temperature not lower than 650° F |
| Hardness | 0 thru 1/2 diameters: Rockwell C39 minimum, 5/8 diametyer and larger: Rockwell C37 minimum. |
| Tensile Strength | 0 thru 1/2 diameters: 180,000 psi minimum, 5/8 diameter and larger: 170,000 psi minimum |
| Yield Strength | 0 thru 1/2 diameters: 162,000 psi minimum, 5/8 diameter and larger: 153,000 psi minimum |
| Elongation | 10% minimum (applies to machined specimens of length at least 4D where D equals the normal screw diameter) |
| Reduction of Area | 33% minimum (applies to machined specimens) |
| Plating | See the plating chart |
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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com Copyright © 2000 by Smith Fastener Company - Last updated: December 17, 2004th - http://www.smithfast.com/alloyshcsinfo.htm |