Button Head Machine Screw
Choose Favorites List

Button Head Machine Screw

ASTM F835 button head machine screws have machine threads, a button-type head and hexagon recess. The ASTM F835 specification covers the requirements for quenched and tempered alloy steel hexagon socket button head cap screws having material properties for high-strength requirements. Dimensional specifications are governed by ASME B18.3. Hex Button socket head cap screws are designed for light duty applications such as securing guards, covers, and ornamental fixtures. Button Heads present a pleasing appearance to an assembly.

Governing StandardsAlloy Steel Button Head Machine Screw

ASTM F835 This specification covers the requirements for quenched and tempered alloy steel hexagon socket button (SBHCS) 0.060 through 0.625 thread sizes and flat countersunk (SFHCS) 0.060 through 1.5 thread sizes head cap screws having material properties for high-strength requirements.
ASME B18.3 Covers the complete general and dimensional data for various types of hexagon socket cap screws, shoulder screws, set screws, and hexagon keys recognized as an American National Standard.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Alloy Steel Button Head Machine Screw Head Marking
Alloy Steel Button Head Machine Screw requires no material marking

Mechanical PropertiesAlloy Steel Button Head Machine Screw

Quenched & Tempered Alloy Steel Per ASTM F835-16
Nominal
Diameter
Full-Size Screws Machined Test Specimen Product Hardness
Tensile
Strength
Yield Strength
at 0.2% offset
Tensile
Strength
Elongation
in 4D
Reduction
of Area
Rockwell C Vickers DPH
ksi ksi ksi % %
1/2" & under 145 min (1) (1) (1) (1) 39-44 382-434
over 1/2" 135 min 153 min 170 min 8 min 35 min 37-44 363-434
  1. 1. Not applicable.

Chemical PropertiesAlloy Steel Button Head Machine Screw

Per ASTM F835-16
Material Heat Analysis Product Analysis
Carbon Phosphorus Sulfur Alloying
Elements
Carbon Phosphorus Sulfur Alloying
Elements
% by weight % by weight % by weight % by weight % by weight % by weight
Quenched and tempered alloy steel 0.30 to 0.48 0.035 max 0.040 max (1) 0.28 to 0.50 0.040 max 0.045 max (1)
  1. 1. One or more of the following alloying elements, chromium, nickel, molybdenum, or vanadium, shall be present in the steel in sufficient quantity to ensure the specific strength properties are met after oil quenching and tempering. The steel shall meet the AISI definition of alloy steel, that is, maximum and minimum element content requirement or minimum element limits specified.

Dimensional SpecificationsGrade 5

Alloy Steel Button Head Machine Screw dimensions
Per ASME B18.3-2012
Size Nominal UNC UNF A H S J T F
Head Diameter Head Height Head
Side
Height
Hex Socket Size Key
Engagement
Fillet Transition
Diameter
Max Min Max Min Fraction
Nominal
Decimal
Nominal
Min Max Min
#0 0.0600   80 0.1140 0.1040 0.0320 0.0260 0.0100 …. 0.0350 0.0200 0.0800 0.0700
#1 0.0730 64 72 0.1390 0.1290 0.0390 0.0330 0.0100 …. 0.0500 0.0280 0.0930 0.0830
#2 0.0860 56 64 0.1640 0.1540 0.0460 0.0380 0.0100 …. 0.0500 0.0280 0.1060 0.0960
#3 0.0990 48 56 0.1880 0.1760 0.0520 0.0440 0.0100 1/16 0.0620 0.0350 0.1190 0.1090
#4 0.1120 40 48 0.2130 0.2010 0.0590 0.0510 0.0150 1/16 0.0620 0.0350 0.1320 0.1220
#5 0.1250 40 44 0.2380 0.2260 0.0660 0.0580 0.0150 5/64 0.0780 0.0440 0.1450 0.1350
#6 0.1380 32 40 0.2620 0.2500 0.0730 0.0630 0.0150 5/64 0.0780 0.0440 0.1580 0.1480
#8 0.1640 32 36 0.3120 0.2980 0.0870 0.0770 0.0150 3/32 0.0940 0.0520 0.1940 0.1840
#10 0.1900 24 32 0.3610 0.3470 0.1010 0.0910 0.0200 1/8 0.1250 0.0700 0.2200 0.2100
1/4 0.2500 20 28 0.4370 0.4190 0.1320 0.1220 0.0310 5/32 0.1560 0.0870 0.2900 0.2800
5/16 0.3125 18 24 0.5470 0.5270 0.1660 0.1520 0.0310 3/16 0.1880 0.1050 0.3530 0.3430
3/8 0.3750 16 24 0.6560 0.6360 0.1990 0.1850 0.0310 7/32 0.2190 0.1220 0.4150 0.4050
1/2 0.5000 13 20 0.8750 0.8510 0.2650 0.2450 0.0460 5/16 0.3120 0.1750 0.5600 0.5400
5/8 0.6250 12 18 1.0000 0.9700 0.3310 0.3110 0.0620 3/8 0.3750 0.2100 0.6850 0.6650
  1. All dimensions are in inches.
Button Head Machine Screw
View
Diameter Thread Pitch Length Item # Availability Price Quantity UOM
#8 32 1/4 SBAC 80025 3-5 Working Days $0.10052/EA EA
#8 32 3/8 SBAC 80037 In Stock $0.02807/EA EA
#8 32 5/8 SBAC 80062 In Stock $0.0801/EA EA
#8 32 3/4 SBAC 80075 In Stock $0.12014/EA EA
#8 32 1 SBAC 80100 In Stock $0.0801/EA EA
#10 24 1/4 SBAC1020025 In Stock $0.0801/EA EA
#10 24 3/8 SBAC1020037 In Stock $0.12014/EA EA
#10 24 1/2 SBAC1020050 In Stock $0.17701/EA EA
#10 24 5/8 SBAC1020062 In Stock $0.24029/EA EA
#10 24 3/4 SBAC1020075 In Stock $0.09411/EA EA
#10 24 7/8 SBAC1020087 In Stock $0.40048/EA EA
#10 24 1 SBAC1020100 In Stock $0.24029/EA EA
#10 24 1 3/4 SBAC1020175 In Stock $0.40048/EA EA
#10 32 1/4 SBAC1030025 In Stock $0.06968/EA EA
#10 32 7/8 SBAC1030087 In Stock $0.72087/EA EA
#10 32 1 SBAC1030100 In Stock $0.48058/EA EA
1/4 20 3/8 SBAC0250037 In Stock $0.20024/EA EA
1/4 20 1/2 SBAC0250050 In Stock $0.09523/EA EA
1/4 20 5/8 SBAC0250062 In Stock $0.28034/EA EA
1/4 20 3/4 SBAC0250075 In Stock $0.15499/EA EA
1/4 20 7/8 SBAC0250087 3-5 Working Days $0.1706/EA EA
1/4 20 1 SBAC0250100 In Stock $0.20264/EA EA
1/4 20 1 1/4 SBAC0250125 3-5 Working Days $0.0801/EA EA
1/4 20 1 3/4 SBAC0250175 In Stock $0.68082/EA EA
1/4 20 2 SBAC0250200 3-5 Working Days $0.47097/EA EA
1/4 20 2 1/2 SBAC0250250 3-5 Working Days $0.5851/EA EA
5/16 18 3/8 SBAC0310037 3-5 Working Days $0.16019/EA EA
5/16 18 1/2 SBAC0310050 In Stock $0.17044/EA EA
5/16 18 3/4 SBAC0310075 In Stock $0.22327/EA EA
5/16 18 1 SBAC0310100 In Stock $0.2495/EA EA
5/16 18 1 1/4 SBAC0310125 In Stock $0.49099/EA EA
3/8 16 1/2 SBAC0370050 In Stock $0.37377/EA EA
3/8 16 3/4 SBAC0370075 In Stock $0.31582/EA EA
3/8 16 1 SBAC0370100 In Stock $0.55791/EA EA
3/8 16 1 1/4 SBAC0370125 In Stock $0.52062/EA EA
3/8 16 1 1/2 SBAC0370150 In Stock $0.60072/EA EA
1/2 13 3/4 SBAC0500075 In Stock $0.83244/EA EA
1/2 13 1 SBAC0500100 3-5 Working Days $0.82659/EA EA
1/2 13 1 1/4 SBAC0500125 In Stock $1.0809/EA EA
1/2 13 1 1/2 SBAC0500150 In Stock $0.98759/EA EA
1/2 13 2 1/2 SBAC0500250 In Stock $2.39111/EA EA
5/8 11 1 1/2 SBAC0620150 In Stock $2.02483/EA EA
5/8 11 1 3/4 SBAC0620175 3-5 Working Days $2.48418/EA EA