Consolidated Tech Man - Holo-Krome

TABLE 25 HOLO-KROME 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:
NOMINAL
SIZES
0 to 1/2
Over 1/2
TENSILE STRENGTH
psi MIN.
180,000
170,000
YIELD STRENGTH
psi MIN.
162,000
153,000
* The values for elongation and reduction of area apply only to cylindrical test specimens.
Values are based on ASTM A-574
ELONGATION*
IN 2 INCHES
PER CENT MIN.
CAUTION: IMPROPER LOADING OF THESE FASTENERS WILL CAUSE FAILURES
TABLE 25 TENSILE, YIELD AND SHEAR STRENGTH
NOMINAL
SIZE
0
1
2
3
4
5
6
8
10
1/4
5/16
3/8
7/16
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
BASIC
SCREW
DIAMETER
0.0600
0.0730
0.0860
0.0990
0.1120
0.1250
0.1380
0.1640
0.1900
0.2500
0.3125
0.3750
0.4375
0.5000
0.6250
0.7500
0.8750
1.0000
1.2500
1.5000
THREAD STRESS
AREA
UNRC UNRF
—
0.00263
0.00370
0.00487
0.00604
0.00796
0.00909
0.0140
0.0175
0.0318
0.0524
0.0775
0.1063
0.1419
0.226
0.334
0.462
0.606
0.969
1.405
0.00180
0.00278
0.00394
0.00523
0.00661
0.00830
0.01015
0.01474
0.0200
0.0364
0.0580
0.0878
0.1187
0.1599
0.256
0.373
0.509
0.663
1.073
1.581
STRAIGHT
TENSILE STRENGTH
(POUNDS MIN.)
UNRC UNRF
—
475
665
875
1,090
1,430
1,640
2,520
3,150
5,725
9,430
13,950
19,135
25,540
38,400
56,750
78,500
103,000
164,700
238,800
NOTES FOR TABLE 25
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).
320
500
710
940
1,190
1,490
1,825
2,650
3,600
6,550
10,440
15,805
21,365
28,780
43,500
63,400
86,500
112,700
182,400
268,800
8
10
STRAIGHT YIELD
STRENGTH
(POUNDS MIN.)
UNRC UNRF
—
425
600
790
975
1,290
1,470
2,270
2,835
5,150
8,490
12,555
17,220
22,990
34,550
51,100
70,700
92,700
148,250
214,950
290
450
635
845
1,070
1,345
1,645
2,385
3,240
5,900
9,395
14,225
19,230
25,905
39,150
57,050
77,850
101,450
164,150
241,900
REDUCTION OF AREA*
PER CENT MIN.
35
40
BODY
SECTION
305
450
625
830
1,060
1,325
1,615
2,280
3,060
5,295
8,285
11,910
16,200
21,175
31,300
45,050
61,350
80,100
125,100
180,200
MINIMUM HARDNESS
ROCKWELL C
39
37
SINGLE SHEAR STRENGTH
(POUNDS MIN.)
THREAD SECTION
UNRC UNRF
—
290
405
535
665
875
1,000
1,535
1,920
3,495
5,750
8,510
11,650
15,565
23,450
34,650
47,900
62,850
100,500
145,700
205
315
445
595
750
940
1,150
1,670
2,270
4,130
6,575
9,950
13,445
18,105
27,400
39,950
54,500
71,000
114,900
169,300
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.
31