Spaenaur

®
Mechanical Properties,
Socket Head Cap Screws – 1960 Series
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.
B
TENSILE YIELD ELONGATION* REDUCTION MINIMUM
NOMINAL STRENGTH STRENGTH IN 2 INCHES OF AREA* HARDNESS
SIZES psi MIN. psi MIN. PERCENT MIN. PERCENT MIN. ROCKWELL C
0 to 1/2 180,000 162,000 8 35 39
Over 1/2 170,000 153,000 10 40 37
* 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 – 290 305 – 205
1 0.0730 0.00263 0.00278 475 500 425 450 450 290 315
2 0.0860 0.00370 0.00394 665 710 600 635 625 405 445
3 0.0990 0.00487 0.00523 875 940 790 845 830 535 595
4 0.1120 0.00604 0.00661 1,090 1,190 975 1,070 1,060 665 750
5 0.1250 0.00796 0.00830 1,430 1,490 1,290 1,345 1,325 875 940
6 0.1380 0.00909 0.01015 1,640 1,825 1,470 1,645 1,615 1,000 1,150
8 0.1640 0.0140 0.01474 2,520 2,650 2,270 2,385 2,280 1,535 1,670
10 0.1900 0.0175 0.0200 3,150 3,600 2,835 3,240 3,060 1,920 2,270
1/4 0.2500 0.0318 0.0364 5,725 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
CATALOG 13
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.
Tel: 1-800-265-8772 Fax: 519-744-0818
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