Consolidated Tech Man - Holo-Krome

TABLE 29 HOLO-KROME BUTTON HEAD AND FLAT COUNTERSUNK HEAD SCREWS
CAUTION:
BUTTON HEAD CAP SCREWS ARE DESIGNED FOR LIGHT FASTENING APPLICATIONS ONLY, SUCH AS SHEETMETAL
COVERS, PLASTIC GUARDS, ETC. THEY SHOULD NOT BE USED IN CRITICAL HIGH STRENGTH APPLICATIONS WHERE
SOCKET HEAD CAP SCREWS SHOULD BE USED.
Standard Holo-Krome Alloy Steel Button, Flat and Low Head Cap Screws
are manufactured from Holo-Krome analysis high grade alloy steel,
hardened and tempered to provide the following mechanical properties.
Because of the head configuration, neither button nor flat head socket cap
screws can develop the full strength of the raw material heat treatment,
4
5
6
8
10
1/4
5/16
3/8
7/16
1/2
5/8
3/4
7/8
1
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
TENSILE STRENGTH
(POUNDS MIN.)
BUTTON HEADS
SHEAR STRENGTH
(POUNDS MIN.)
and the values show below for tensile values are minimum strengths
which full size screws will pull in a tensile test.
Applicable Standards and Specifications
ASTM F835
TABLE 29 MECHANICAL PROPERTIES AND TIGHTENING TORQUES FOR BUTTON AND FLAT COUNTER-
SUNK HEAD CAP SCREWS
NOMINAL
SIZE
880
-
1,320
2,030
2,540
4,610
7,600
11,200
-
20,600
30,500
-
-
-
620
-
940
1,450
1,810
3,300
5,430
8,040
-
14,700
23,400
-
-
-
TIGHTENING TORQUE
(INCH - POUNDS)
8
-
15
30
65
125
200
360
-
1000
1750
-
The torque values given are for standard black screws in rigid joints, when torqued with standard keys or bits.
Values based on ASTM F-835
NOTES FOR TABLE 29 AND TABLE 29A
The mechanical properties listed are for screws tested and used at
normal room temperatures. The values for the Low Heads are based on
a tensile strength of 170,000 psi minimum and a minimum hardness
value of HRC38. In applications where the temperatures are considera-
4
5
6
8
10
1/4
5/16
3/8
7/16
1/2
5/8
0.1120
0.1250
0.1380
0.1640
0.1900
0.2500
0.3125
0.3750
0.4375
0.5000
0.6250
840
1,100
1,260
1,940
2,440
4,430
7,300
10,800
14,800
19,800
31,500
620
820
940
1,450
1,810
3,300
5,430
8,040
11,000
14,700
23,400
-
-
TENSILE STRENGTH
(POUNDS MIN.)
880
1,150
1,320
2,030
2,540
4,610
7,600
11,200
15,400
20,600
30,500
45,100
62,400
81,800
FLAT COUNTERSUNK HEADS
SHEAR STRENGTH
(POUNDS MIN.)
BODY THREAD
SECTION SECTION
1,100
1,370
1,670
2,360
3,180
5,500
8,590
12,350
16,800
22,000
34,350
49,500
61,000
80,100
620
820
940
1,450
1,810
3,300
5,430
8,040
11,000
14,700
23,400
34,600
47,900
62,850
TIGHTENING TORQUE
(INCH - POUNDS)
9.5
14
18
32
75
140
245
400
600
1200
2000
4000
6000
8500
bly below or above room temperature, the effect of the temperature must
be considered. Short time tensile, creep and 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).
TABLE 29A MECHANICAL PROPERTIES AND TIGHTENING TORQUES FOR LOW HEAD SOCKET
HEAD CAP SCREWS
NOMINAL
SIZE
BASIC
SCREW
DIAMETER
BASIC
SCREW
DIAMETER
TENSILE STRENGTH
(POUNDS MIN.)
LOW HEAD CAP SCREWS
SHEAR STRENGTH
(POUNDS MIN.)
TIGHTENING TORQUE
(INCH - POUNDS)
5.0
9.5
9.5
19.0
30
75
150
275
425
600
1300
The torque values given are for standard black screws in rigid joints, when torqued with standard keys or bits.
HEX KEY SIZE
0.050
1/16
1/16
5/64
3/32
1/8
5/32
3/16
7/32
1/4
5/16
The torque values are based on the effective
torque strength of a standard Allen
Wrench used within its torque capabilities.
Because of the size of the socket,
these products may not be torqued to the
full preload of which they are capable.
35