Section B

Mechanical Properties / Socket Head Cap Screws Propriétés mécaniques / Vis d'assemblage à tête creuse

Inch Pouce

®

Standard Holo-Krome Alloy Steel Socket Head Cap Screws are manufactured from Holo-Krome analysis high grade alloy steel hardened and tempered to provide the following mechanical properties.

TENSILE

YIELD ELONGATION* REDUCTION MINIMUM

B

B

NOMINAL STRENGTH STRENGTH IN 2 INCHES OF AREA*

HARDNESS

SIZES psi MIN.

psi MIN. 162,000 153,000

PERCENT MIN. PERCENT MIN. ROCKWELL C

0 to 1/2 Over 1/2

180,000 170,000

8

35 40

39 37

10

* The values for elongation and reduction of area apply only to cylindrical test specimens. Values are based on ASTM A-574

CAUTION: IMPROPER LOADING OF THESE FASTENERS WILL CAUSE FAILURES

TENSILE,YIELD AND SHEAR STRENGTH

STRAIGHT

STRAIGHT YIELD

SINGLE SHEAR STRENGTH

BASIC

THREAD STRESS

TENSILE STRENGTH

STRENGTH

(POUNDS MIN.)

NOMINAL SCREW

AREA

(POUNDS MIN.)

(POUNDS MIN.)

BODY

THREAD SECTION

SIZE DIAMETER UNRC

UNRF

UNRC

UNRF

UNRC

UNRF

SECTION UNRC

UNRF

0 0.0600 –

0.00180

–

320 500 710 940

–

290 450 635 845

305 450 625 830

–

205 315 445 595 750 940

1 0.0730 0.00263 0.00278 475 2 0.0860 0.00370 0.00394 665 3 0.0990 0.00487 0.00523 875 4 0.1120 0.00604 0.00661 1,090 5 0.1250 0.00796 0.00830 1,430 6 0.1380 0.00909 0.01015 1,640 8 0.1640 0.0140 0.01474 2,520 10 0.1900 0.0175 0.0200 3,150 1/4 0.2500 0.0318 0.0364 5,725

425 600 790

290 405 535 665 875

1,190

975 1,070 1,060

1,490 1,290 1,345 1,325

1,825 1,470 1,645 1,615 1,000 1,150 2,650 2,270 2,385 2,280 1,535 1,670 3,600 2,835 3,240 3,060 1,920 2,270

6,550 5,150 5,900 5,295 3,495 4,130 5/16 0.3125 0.0524 0.0580 9,430 10,440 8,490 9,395 8,285 5,750 6,575 3/8 0.3750 0.0775 0.0878 13,950 15,805 12,555 14,225 11,910 8,510 9,950 7/16 0.4375 0.1063 0.1187 19,135 21,365 17,220 19,230 16,200 11,650 13,445 1/2 0.5000 0.1419 0.1599 25,540 28,780 22,990 25,905 21,175 15,656 18,105 5/8 0.6250 0.226 0.256 38,400 43,500 34,550 39,150 31,300 23,450 27,400 3/4 0.7500 0.334 0.373 56,750 63,400 51,100 57,050 45,050 34,650 39,650 7/8 0.8750 0.462 0.509 78,500 86,500 70,700 77,850 61,350 47,900 54,500 1 1.0000 0.606 0.663 103,000 112,700 92,700 101,450 80,100 62,850 71,000 1-1/4 1.2500 0.969 1.073 164,700 182,400 148,250 164,150 125,100 100,500 114,900 1-1/2 1.5000 1.405 1.581 238,800 268,800 214,950 241,900 180,200 145,700 169,300

NOTES FOR CHART The mechanical properties listed are for standard screws tested at normal room temperatures. In applications where the temperatures are considerably above or below room temperature the effect of the temperature on the screw strength must be considered. Short time tensile, creep and stress relaxation should be considered for applications where the temperature exceeds 400 ° F (204 ° C) . Lower ductility, impact strength and fatigue life must be considered for screws subject to temperatures below -20 ° F (-29 ° C) .

The materials and heat treatment used for standard Holo-Krome Alloy Socket Head Cap Screws were selected to provide products that would have optimum tensile strength, impact strength and fatigue life. For specific applications, screws can be supplied to higher hardness levels so that their tensile strength will exceed values listed. However, such screws will have lower ductility, impact strength and fatigue life at higher stress levels than will standard screws.

CATALOG 14

B181

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