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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.

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Governing Standards
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Dimensional Specifications

Dimensional Specifications

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	Head Side Height	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

All dimensions are in inches.

Button Head Machine Screw

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Diameter Thread Pitch Length Item # Availability Price Quantity UOM

1/4

SBAC 80025

3-5 Working Days

$0.10052/EA

See Quantity Discounts

#8-32 X 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.10052/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.10052/ EA
2280	$0.09422/ EA
9100	$0.08378/ EA
36370	$0.05583/ EA

3/8

SBAC 80037

In Stock

$0.02807/EA

See Quantity Discounts

#8-32 X 3/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.02807/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.02807/ EA
1840	$0.02631/ EA
7330	$0.0234/ EA
29310	$0.01559/ EA

5/8

SBAC 80062

In Stock

$0.0801/EA

See Quantity Discounts

#8-32 X 5/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
1300	$0.07508/ EA
5190	$0.06676/ EA
20730	$0.04448/ EA

3/4

SBAC 80075

In Stock

$0.12014/EA

See Quantity Discounts

#8-32 X 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.12014/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12014/ EA
1150	$0.11261/ EA
4580	$0.10013/ EA
18310	$0.06673/ EA

SBAC 80100

In Stock

$0.0801/EA

See Quantity Discounts

#8-32 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
1800	$0.07508/ EA
7200	$0.06676/ EA
32380	$0.04448/ EA

#10

1/4

SBAC1020025

In Stock

$0.08975/EA

See Quantity Discounts

#10-24 X 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.08975/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.08975/ EA
1650	$0.08412/ EA
6580	$0.0748/ EA
26320	$0.04984/ EA

#10

3/8

SBAC1020037

In Stock

$0.12014/EA

See Quantity Discounts

#10-24 X 3/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.12014/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12014/ EA
1360	$0.11261/ EA
5440	$0.10013/ EA
21740	$0.06673/ EA

#10

1/2

SBAC1020050

In Stock

$0.16928/EA

See Quantity Discounts

#10-24 X 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.16928/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16928/ EA
1110	$0.15867/ EA
4410	$0.14109/ EA
17630	$0.09402/ EA

#10

5/8

SBAC1020062

In Stock

$0.24029/EA

See Quantity Discounts

#10-24 X 5/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.24029/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.24029/ EA
1990	$0.22523/ EA
7960	$0.20027/ EA
35790	$0.13345/ EA

#10

3/4

SBAC1020075

In Stock

$0.09411/EA

See Quantity Discounts

#10-24 X 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.09411/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.09411/ EA
1660	$0.08821/ EA
6630	$0.07844/ EA
29810	$0.05227/ EA

#10

7/8

SBAC1020087

In Stock

$0.40048/EA

See Quantity Discounts

#10-24 X 7/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.40048/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.40048/ EA
1500	$0.37538/ EA
6000	$0.33378/ EA
26990	$0.22242/ EA

#10

SBAC1020100

In Stock

$0.24029/EA

See Quantity Discounts

#10-24 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.24029/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.24029/ EA
1350	$0.22523/ EA
5390	$0.20027/ EA
24230	$0.13345/ EA

#10

1 3/4

SBAC1020175

In Stock

$0.40048/EA

See Quantity Discounts

#10-24 X 1 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.40048/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.40048/ EA
860	$0.37538/ EA
3430	$0.33378/ EA
15420	$0.22242/ EA

#10

1/4

SBAC1030025

In Stock

$0.06968/EA

See Quantity Discounts

#10-32 X 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.06968/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.06968/ EA
1650	$0.06532/ EA
6580	$0.05808/ EA
26320	$0.0387/ EA

#10

7/8

SBAC1030087

In Stock

$0.72087/EA

See Quantity Discounts

#10-32 X 7/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.72087/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.72087/ EA
1500	$0.67568/ EA
6000	$0.6008/ EA
26990	$0.40036/ EA

#10

SBAC1030100

In Stock

$0.48058/EA

See Quantity Discounts

#10-32 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.48058/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.48058/ EA
1350	$0.45045/ EA
5390	$0.40053/ EA
24230	$0.2669/ EA

1/4

3/8

SBAC0250037

In Stock

$0.20024/EA

See Quantity Discounts

1/4-20 X 3/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.20024/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.20024/ EA
1450	$0.18769/ EA
5770	$0.16689/ EA
25940	$0.11121/ EA

1/4

1/2

SBAC0250050

In Stock

$0.09467/EA

See Quantity Discounts

1/4-20 X 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.09467/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.09467/ EA
1200	$0.08874/ EA
4790	$0.07891/ EA
21540	$0.05258/ EA

1/4

5/8

SBAC0250062

In Stock

$0.28034/EA

See Quantity Discounts

1/4-20 X 5/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.28034/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28034/ EA
1060	$0.26276/ EA
4210	$0.23364/ EA
18910	$0.15569/ EA

1/4

3/4

SBAC0250075

In Stock

$0.15503/EA

See Quantity Discounts

1/4-20 X 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.15503/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.15503/ EA
930	$0.14531/ EA
3700	$0.12921/ EA
16640	$0.0861/ EA

1/4

7/8

SBAC0250087

3-5 Working Days

$0.1706/EA

See Quantity Discounts

1/4-20 X 7/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.1706/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.1706/ EA
840	$0.15991/ EA
3330	$0.14219/ EA
14980	$0.09475/ EA

1/4

SBAC0250100

In Stock

$0.2026/EA

See Quantity Discounts

1/4-20 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.2026/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.2026/ EA
760	$0.1899/ EA
3030	$0.16886/ EA
13610	$0.11252/ EA

1/4

1 1/4

SBAC0250125

3-5 Working Days

$0.0801/EA

See Quantity Discounts

1/4-20 X 1 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.0801/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
640	$0.07508/ EA
2540	$0.06676/ EA
11420	$0.04448/ EA

1/4

1 3/4

SBAC0250175

In Stock

$0.68082/EA

See Quantity Discounts

1/4-20 X 1 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.68082/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.68082/ EA
470	$0.63814/ EA
1850	$0.56742/ EA
8330	$0.37811/ EA

1/4

SBAC0250200

In Stock

$0.4515/EA

See Quantity Discounts

1/4-20 X 2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.4515/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.4515/ EA
430	$0.4232/ EA
1700	$0.3763/ EA
7610	$0.25076/ EA

1/4

2 1/2

SBAC0250250

3-5 Working Days

$0.5851/EA

See Quantity Discounts

1/4-20 X 2 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.5851/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.5851/ EA
350	$0.54842/ EA
1380	$0.48765/ EA
6210	$0.32496/ EA

5/16

3/8

SBAC0310037

3-5 Working Days

$0.16019/EA

See Quantity Discounts

5/16-18 X 3/8 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.16019/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.16019/ EA
820	$0.15015/ EA
3280	$0.13351/ EA
14750	$0.08897/ EA

5/16

1/2

SBAC0310050

In Stock

$0.17028/EA

See Quantity Discounts

5/16-18 X 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.17028/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.17028/ EA
670	$0.15961/ EA
2670	$0.14192/ EA
12010	$0.09457/ EA

5/16

3/4

SBAC0310075

In Stock

$0.22026/EA

See Quantity Discounts

5/16-18 X 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.22026/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.22026/ EA
540	$0.20646/ EA
2150	$0.18358/ EA
9670	$0.12233/ EA

5/16

SBAC0310100

In Stock

$0.25154/EA

See Quantity Discounts

5/16-18 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.25154/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.25154/ EA
440	$0.23577/ EA
1740	$0.20965/ EA
7810	$0.1397/ EA

5/16

1 1/4

SBAC0310125

In Stock

$0.49099/EA

See Quantity Discounts

5/16-18 X 1 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.49099/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.49099/ EA
370	$0.46021/ EA
1480	$0.40921/ EA
6650	$0.27269/ EA

3/8

1/2

SBAC0370050

In Stock

$0.37393/EA

See Quantity Discounts

3/8-16 X 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.37393/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.37393/ EA
420	$0.35049/ EA
1680	$0.31165/ EA
7560	$0.20767/ EA

3/8

3/4

SBAC0370075

In Stock

$0.88402/EA

See Quantity Discounts

3/8-16 X 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.88402/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.88402/ EA
350	$0.8286/ EA
1380	$0.73678/ EA
6210	$0.49097/ EA

3/8

SBAC0370100

In Stock

$0.47998/EA

See Quantity Discounts

3/8-16 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.47998/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.47998/ EA
290	$0.44989/ EA
1130	$0.40003/ EA
5080	$0.26657/ EA

3/8

1 1/4

SBAC0370125

In Stock

$0.52062/EA

See Quantity Discounts

3/8-16 X 1 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.52062/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.52062/ EA
240	$0.48799/ EA
960	$0.43391/ EA
4290	$0.28915/ EA

3/8

1 1/2

SBAC0370150

In Stock

$0.60072/EA

See Quantity Discounts

3/8-16 X 1 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.60072/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.60072/ EA
210	$0.56306/ EA
840	$0.50067/ EA
3770	$0.33363/ EA

1/2

3/4

SBAC0500075

In Stock

$0.83292/EA

See Quantity Discounts

1/2-13 X 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.83292/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.83292/ EA
180	$0.78071/ EA
700	$0.69419/ EA
3130	$0.46259/ EA

1/2

SBAC0500100

3-5 Working Days

$0.82659/EA

See Quantity Discounts

1/2-13 X 1 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.82659/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.82659/ EA
150	$0.77477/ EA
600	$0.68892/ EA
2680	$0.45907/ EA

1/2

1 1/4

SBAC0500125

In Stock

$1.0809/EA

See Quantity Discounts

1/2-13 X 1 1/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$1.0809/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.0809/ EA
130	$1.01314/ EA
520	$0.90087/ EA
2310	$0.60031/ EA

1/2

1 1/2

SBAC0500150

In Stock

$0.98746/EA

See Quantity Discounts

1/2-13 X 1 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$0.98746/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.98746/ EA
120	$0.92556/ EA
450	$0.823/ EA
1990	$0.54842/ EA

1/2

2 1/2

SBAC0500250

In Stock

$2.39111/EA

See Quantity Discounts

1/2-13 X 2 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$2.39111/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.39111/ EA
80	$2.24122/ EA
300	$1.99286/ EA
1330	$1.32798/ EA

5/8

1 1/2

SBAC0620150

In Stock

$2.02483/EA

See Quantity Discounts

5/8-11 X 1 1/2 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$2.02483/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.02483/ EA
70	$1.8979/ EA
280	$1.68758/ EA
1230	$1.12456/ EA

5/8

1 3/4

SBAC0620175

3-5 Working Days

$2.48418/EA

See Quantity Discounts

5/8-11 X 1 3/4 F835 ALLOY STEEL BUTTON HEAD MACHINE SCREW

$2.48418/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.48418/ EA
70	$2.32845/ EA
250	$2.07043/ EA
1110	$1.37967/ EA

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.

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	%	%	Rockwell C	Vickers DPH
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

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	Alloying Elements	% by weight	% by weight	% by weight	Alloying Elements
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)