Flat Socket Cap Screw
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Flat Socket Cap Screw

ASTM F835 Flat Socket head cap screws have a countersunk head with a flat top surface and hexagonal recess. The ASTM F835 specification covers the requirements for quenched and tempered alloy steel hexagon flat countersunk head cap screws, having material properties for high-strength requirements. Dimensional specifications are governed by ASME B18.3. Flat socket head cap screws are commonly used in applications in which it is necessary to recess the head of the fastener flush with the surface.

Governing StandardsAlloy Steel Flat Socket Cap 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 Flat Socket Cap Screw Head Marking
Alloy Steel Flat Socket Cap Screw requires no material marking

Mechanical PropertiesAlloy Steel Flat Socket Cap 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 Flat Socket Cap 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 SpecificationsAlloy Steel Flat Socket Cap Screw

Alloy Steel Flat Socket cap screw dimensions
Per ASME B18.3-2012
Size Nominal UNC UNF D A G P H J T L
Body Head Diameter Protrusion
Gage Diameter
Protrusion Head
Height
Hex Socket Size Key
Engagement
Thread Length
Max Min Max Min Max Min Max Min   Fraction Decimal Min Min Max
#0 0.0600   80 0.0600 0.0568 0.1380 0.1170 0.0780 0.0770 0.0360 0.0260 0.0440 …. 0.0350 0.0250 0.5000 0.6200
#1 0.0730 64 72 0.0730 0.0695 0.1680 0.1430 0.1010 0.1000 0.0400 0.0280 0.0540 …. 0.0500 0.0310 0.6200 0.7700
#2 0.0860 56 64 0.0860 0.0822 0.1970 0.1630 0.1240 0.1230 0.0430 0.0310 0.0640 …. 0.0500 0.0380 0.6200 0.8000
#3 0.0990 48 56 0.0990 0.0949 0.2260 0.1930 0.1480 0.1470 0.0460 0.0330 0.0730 1/16 0.0620 0.0440 0.6200 0.8300
#4 0.1120 40 48 0.1120 0.1075 0.2550 0.2180 0.1720 0.1710 0.0490 0.0360 0.0890 1/16 0.0620 0.0550 0.7500 0.9900
#5 0.1250 40 44 0.1250 0.1202 0.2810 0.2400 0.1960 0.1950 0.0510 0.0370 0.0900 5/64 0.0780 0.0610 0.7500 1.0000
#6 0.1380 32 40 0.1380 0.1329 0.3070 0.2630 0.2200 0.2190 0.0520 0.0370 0.0970 5/64 0.0780 0.0660 0.7500 1.0500
#8 0.1640 32 36 0.1640 0.1585 0.3590 0.3110 0.2670 0.2660 0.0550 0.0390 0.1120 3/32 0.0940 0.0760 0.8750 1.1900
#10 0.1900 24 32 0.1900 0.1840 0.4110 0.3590 0.3130 0.3120 0.0580 0.0410 0.1270 1/8 0.1250 0.0870 0.8750 1.2700
#12 0.2120 24 28 0.2160 0.2095 0.4500 0.4100 0.3600 0.3590 0.0690 0.0420 0.1350 1/8 0.1250 0.0940 1.0000 1.3300
1/4 0.2500 20 28 0.2500 0.2435 0.5310 0.4800 0.4240 0.4230 0.0640 0.0430 0.1610 5/32 0.1560 0.1110 1.0000 1.5000
5/16 0.3125 18 24 0.3125 0.3053 0.6560 0.6000 0.5390 0.5380 0.0700 0.4700 0.1980 3/16 0.1880 0.1350 1.1250 1.7100
3/8 0.3750 16 24 0.3750 0.3678 0.7810 0.7200 0.6530 0.6520 0.0760 0.0500 0.2340 7/32 0.2190 0.1590 1.2500 1.9400
7/16 0.4375 14 20 0.4375 0.4294 0.8440 0.7810 0.6900 0.6890 0.0920 0.0630 0.2340 1/4 0.2500 0.1590 1.3750 2.1700
1/2 0.5000 13 20 0.5000 0.4919 0.9380 0.8720 0.7390 0.7380 0.1190 0.0870 0.2510 5/16 0.3120 0.1720 1.5000 2.3800
5/8 0.6250 11 18 0.6250 0.6163 1.1880 1.1120 0.9620 0.9610 0.1350 0.0960 0.3240 3/8 0.3750 0.2200 1.7500 2.8200
3/4 0.7500 10 16 0.7500 0.7406 1.4380 1.3550 1.1860 1.1850 0.1500 0.1050 0.9600 1/2 0.5000 0.2200 2.0000 3.2500
7/8 0.8750 9 14 0.8750 0.8647 1.6880 1.6040 1.4110 1.1410 0.1650 0.1180 0.4680 9/16 0.5620 0.2480 2.2500 3.6900
1 1.0000 8 14 1.0000 0.9886 1.9380 1.8410 1.6350 1.6340 0.1810 0.1300 0.5400 5/8 0.6250 0.2970 2.5000 4.1200
1 1/8 1.1250 7 12 1.1250 1.1086 2.1880 2.0790 1.8590 1.8580 0.1960 0.1400 0.6110 3/4 0.7500 0.3250 2.8100 4.6500
1 1/4 1.2500 7 12 1.2500 1.2336 2.4380 2.3160 2.0830 2.0820 0.2120 0.1500 0.6830 7/8 0.8750 0.3580 3.1200 5.0900
1 3/8 1.3750 7 12 1.3750 1.3568 2.6880 2.5530 2.3060 2.3050 0.2280 0.1620 0.7550 7/8 0.8750 0.4020 3.4400 5.6500
1 1/2 1.5000 6 12 1.5000 1.4818 2.9380 2.7910 2.5300 2.5290 0.2430 0.1730 0.8270 1 1.0000 0.4350 3.7500 6.0800
  1. All dimensions are in inches.
Flat Socket Cap Screw
View
Diameter Thread Pitch Length Item # Availability Price Quantity UOM
#4 40 1/4 SFLA 40025 In Stock $0.14798/EA EA
#4 40 1/2 SFLA 40050 In Stock $0.22198/EA EA
#4 40 3/4 SFLA 40075 In Stock $0.29597/EA EA
#6 32 1/4 SFLA 60025 In Stock $0.06167/EA EA
#6 32 1/2 SFLA 60050 In Stock $0.04303/EA EA
#6 32 3/4 SFLA 60075 In Stock $0.09201/EA EA
#8 32 3/8 SFLA 80037 In Stock $0.08491/EA EA
#8 32 1/2 SFLA 80050 In Stock $0.61757/EA EA
#8 32 5/8 SFLA 80062 In Stock $0.07399/EA EA
#8 32 1 SFLA 80100 In Stock $0.07399/EA EA
#10 24 3/8 SFLA1020037 In Stock $0.07769/EA EA
#10 24 1/2 SFLA1020050 In Stock $0.0643/EA EA
#10 24 5/8 SFLA1020062 In Stock $0.037/EA EA
#10 24 3/4 SFLA1020075 In Stock $0.09589/EA EA
#10 24 1 SFLA1020100 3-5 Working Days $0.11628/EA EA
#10 24 1 1/4 SFLA1020125 In Stock $0.11728/EA EA
#10 24 1 1/2 SFLA1020150 In Stock $0.0795/EA EA
#10 32 5/8 SFLA1030062 In Stock $0.18498/EA EA
#10 32 3/4 SFLA1030075 In Stock $0.13566/EA EA
#10 32 1 1/4 SFLA1030125 In Stock $0.1724/EA EA
#10 32 1 1/2 SFLA1030150 In Stock $0.14798/EA EA
#12 24 3/4 SFLA1220075 In Stock $0.24495/EA EA
#12 24 1 SFLA1220100 In Stock $0.73992/EA EA
1/4 20 1/2 SFLA0250050 In Stock $0.13378/EA EA
1/4 20 5/8 SFLA0250062 In Stock $0.12283/EA EA
1/4 20 3/4 SFLA0250075 In Stock $0.14928/EA EA
1/4 20 1 SFLA0250100 In Stock $0.17432/EA EA
1/4 20 1 1/4 SFLA0250125 In Stock $0.22986/EA EA
1/4 20 1 1/2 SFLA0250150 In Stock $0.17222/EA EA
1/4 20 2 SFLA0250200 In Stock $0.33422/EA EA
1/4 20 2 1/2 SFLA0250250 In Stock $0.50562/EA EA
5/16 18 1/2 SFLA0310050 In Stock $0.16511/EA EA
5/16 18 3/4 SFLA0310075 In Stock $0.15845/EA EA
5/16 18 1 SFLA0310100 In Stock $0.19608/EA EA
5/16 18 1 1/4 SFLA0310125 In Stock $0.28938/EA EA
5/16 18 1 1/2 SFLA0310150 In Stock $0.44587/EA EA
5/16 18 1 3/4 SFLA0310175 In Stock $0.40141/EA EA
5/16 18 2 SFLA0310200 In Stock $0.39423/EA EA
3/8 16 5/8 SFLA0370062 In Stock $0.22198/EA EA
3/8 16 3/4 SFLA0370075 In Stock $0.38735/EA EA
3/8 16 7/8 SFLA0370087 In Stock $0.49649/EA EA
3/8 16 1 SFLA0370100 In Stock $0.3852/EA EA
3/8 16 1 1/4 SFLA0370125 In Stock $0.5/EA EA
3/8 16 1 1/2 SFLA0370150 In Stock $0.33015/EA EA
3/8 16 1 3/4 SFLA0370175 In Stock $0.4118/EA EA
3/8 16 2 SFLA0370200 In Stock $0.77814/EA EA
3/8 16 2 1/2 SFLA0370250 In Stock $0.96545/EA EA
3/8 16 3 SFLA0370300 In Stock $0.81791/EA EA
3/8 16 3 1/2 SFLA0370350 In Stock $1.13933/EA EA
7/16 14 3/4 SFLA0430075 In Stock $0.58372/EA EA
7/16 14 1 SFLA0430100 In Stock $0.70925/EA EA
7/16 14 1 1/4 SFLA0430125 In Stock $0.92738/EA EA
7/16 14 1 1/2 SFLA0430150 In Stock $0.83504/EA EA
7/16 14 2 SFLA0430200 In Stock $1.57695/EA EA
7/16 14 3 SFLA0430300 In Stock $0.85091/EA EA
7/16 14 4 SFLA0430400 In Stock $3.68516/EA EA
1/2 13 3/4 SFLA0500075 In Stock $0.4138/EA EA
1/2 13 1 SFLA0500100 In Stock $0.64114/EA EA
1/2 13 1 1/4 SFLA0500125 In Stock $0.91639/EA EA
1/2 13 1 1/2 SFLA0500150 In Stock $0.91517/EA EA
1/2 13 1 3/4 SFLA0500175 In Stock $1.05176/EA EA
1/2 13 2 SFLA0500200 In Stock $1.15586/EA EA
1/2 13 2 1/4 SFLA0500225 In Stock $0.8657/EA EA
1/2 13 2 1/2 SFLA0500250 In Stock $1.36448/EA EA
1/2 13 3 SFLA0500300 In Stock $1.70285/EA EA
5/8 11 1 1/4 SFLA0620125 In Stock $0.96249/EA EA
5/8 11 1 1/2 SFLA0620150 In Stock $1.40259/EA EA
5/8 11 1 3/4 SFLA0620175 In Stock $1.798/EA EA
5/8 11 2 SFLA0620200 In Stock $1.21495/EA EA
5/8 11 2 1/2 SFLA0620250 In Stock $1.42105/EA EA
5/8 11 3 SFLA0620300 In Stock $1.89223/EA EA
5/8 11 3 1/2 SFLA0620350 In Stock $3.11358/EA EA
5/8 11 4 SFLA0620400 In Stock $3.25919/EA EA
5/8 11 4 1/2 SFLA0620450 In Stock $8.60233/EA EA
5/8 11 5 1/2 SFLA0620550 In Stock $6.55035/EA EA
5/8 11 6 SFLA0620600 In Stock $6.73326/EA EA
5/8 11 6 1/2 SFLA0620650 In Stock $23.01546/EA EA
3/4 10 1 SFLA0750100 In Stock $2.17192/EA EA
3/4 10 1 1/4 SFLA0750125 In Stock $3.30906/EA EA
3/4 10 1 1/2 SFLA0750150 In Stock $2.60821/EA EA
3/4 10 1 3/4 SFLA0750175 In Stock $4.89341/EA EA
3/4 10 2 SFLA0750200 In Stock $2.23045/EA EA
3/4 10 2 1/4 SFLA0750225 In Stock $2.8135/EA EA
3/4 10 2 1/2 SFLA0750250 In Stock $2.85834/EA EA
3/4 10 3 SFLA0750300 In Stock $2.75235/EA EA
3/4 10 3 1/2 SFLA0750350 In Stock $5.59027/EA EA
3/4 10 4 SFLA0750400 In Stock $8.71624/EA EA
3/4 10 4 1/2 SFLA0750450 In Stock $11.45024/EA EA
3/4 10 5 1/2 SFLA0750550 In Stock $15.16833/EA EA
3/4 10 6 SFLA0750600 In Stock $12.94488/EA EA
7/8 9 2 SFLA0870200 In Stock $6.83751/EA EA
1 8 2 SFLA1000200 In Stock $23.12986/EA EA
1 8 2 1/2 SFLA1000250 In Stock $13.50466/EA EA
1 8 3 SFLA1000300 In Stock $24.97225/EA EA
1 8 4 SFLA1000400 In Stock $20.79171/EA EA
1 8 6 SFLA1000600 In Stock $43.5559/EA EA