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SS Slotted Flat Head Machine Screw

Machine screws are uniformly threaded fasteners with a blunt end that are used with a threaded nut or threaded into a tapped hole. The slotted flat head offers a countersunk design to allow for flush installation. These fasteners are available in 18-8 stainless steel.

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Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsType 2A Threads for Machine Screws

Type 2A Threads for Machine Screws dimensions

ASME B1.1 (2008)
Nominal Size	Threads per Inch	Allowance	Major Diameter		Pitch Diameter			Stress Area in²
			Major Diameter		Pitch Diameter
			Max	Min	Max	Min	Tolerance
#0	80	0.0005	0.0595	0.0563	0.0514	0.0496	0.001762	0.00180
#1	64	0.0006	0.0724	0.0686	0.0623	0.0603	0.001970	0.00263
#1	72	0.0006	0.0724	0.0689	0.0634	0.0615	0.001899	0.00278
#2	56	0.0006	0.0854	0.0813	0.0738	0.0717	0.002127	0.00370
#2	64	0.0006	0.0854	0.0816	0.0753	0.0733	0.002040	0.00394
#3	48	0.0007	0.0983	0.0938	0.0848	0.0825	0.002302	0.00487
#3	56	0.0007	0.0983	0.0942	0.0867	0.0845	0.002191	0.00523
#4	40	0.0008	0.1112	0.1061	0.0950	0.0925	0.002507	0.00604
#4	48	0.0007	0.1113	0.1068	0.0978	0.0954	0.002361	0.00661
#5	40	0.0008	0.1242	0.1191	0.1080	0.1054	0.002562	0.00796
#5	44	0.0007	0.1243	0.1195	0.1095	0.1070	0.002484	0.00830
#6	32	0.0008	0.1372	0.1312	0.1169	0.1141	0.002820	0.00909
#6	40	0.0008	0.1372	0.1321	0.1210	0.1184	0.002614	0.01015
#8	32	0.0009	0.1631	0.1571	0.1428	0.1399	0.002916	0.01400
#8	36	0.0008	0.1632	0.1577	0.1452	0.1424	0.002804	0.01474
#10	24	0.0010	0.1890	0.1818	0.1619	0.1586	0.003319	0.01750
#10	32	0.0009	0.1891	0.1831	0.1688	0.1658	0.003004	0.02000
#12	24	0.0010	0.2150	0.2078	0.1879	0.1845	0.003400	0.02420
#12	28	0.0010	0.2150	0.2085	0.1918	0.1886	0.003224	0.02580
1/4	20	0.0011	0.2489	0.2408	0.2164	0.2127	0.003731	0.03180
1/4	28	0.0010	0.2490	0.2425	0.2258	0.2225	0.003322	0.03640
5/16	18	0.0012	0.3113	0.3026	0.2752	0.2712	0.004041	0.05240
5/16	24	0.0011	0.3114	0.3042	0.2843	0.2806	0.003660	0.05800
3/8	16	0.0013	0.3737	0.3643	0.3331	0.3287	0.004363	0.07750
3/8	24	0.0011	0.3739	0.3667	0.3468	0.3430	0.003804	0.08780
1/2	13	0.0015	0.4985	0.4876	0.4485	0.4435	0.004965	0.14190
1/2	20	0.0013	0.4987	0.4906	0.4662	0.4619	0.004288	0.15990

Nominal Screw Size	Nominal Screw Length (L) Tolerance
	Up to 1/2 in., incl.	Over 1/2 to 1 in., incl.	Over 1 to 2 in., incl.	Over 2 in.
0 thru 12	-0.02	-0.03	-0.06	-0.09
1/4 thru 3/4	-0.03	-0.03	-0.06	-0.09

All dimensions are in inches.

Dimensional SpecificationsSlotted Flat Head for Machine Screws

Slotted Flat Head for Machine Screws dimensions

ASME B18.6.3-2013
Nominal Size	A		H		J		T		M	R	N	F		G	Phillips Drive Size
	Head Dimensions				Slot Dimensions				Phillips Dimensions			Protrusion Above Gaging Diameter		Gaging Diameter
	Head Dimensions				Slot Dimensions				Phillips Dimensions
	Diameter		Height		Width		Depth		Diam.	Depth	Width
	Max	Min	Max	Min	Max	Min	Max	Min	Diam.	Depth	Width	Max	Min
#0	0.112	0.096	0.035	0.026	0.023	0.016	0.015	0.010	0.062	0.035	0.014	0.026	0.016	0.078	0
#1	0.137	0.120	0.043	0.033	0.026	0.019	0.019	0.012	0.070	0.043	0.015	0.028	0.016	0.101	0
#2	0.162	0.144	0.051	0.040	0.031	0.023	0.023	0.015	0.096	0.055	0.017	0.029	0.017	0.124	1
#3	0.187	0.167	0.059	0.047	0.035	0.027	0.027	0.017	0.100	0.060	0.018	0.031	0.018	0.148	1
#4	0.212	0.191	0.067	0.055	0.039	0.031	0.030	0.020	0.122	0.081	0.018	0.032	0.019	0.172	1
#5	0.237	0.215	0.075	0.062	0.043	0.035	0.034	0.022	0.148	0.074	0.027	0.034	0.020	0.196	2
#6	0.262	0.238	0.083	0.069	0.048	0.039	0.038	0.024	0.168	0.094	0.029	0.036	0.021	0.220	2
#8	0.312	0.285	0.100	0.084	0.054	0.045	0.045	0.029	0.182	0.110	0.030	0.039	0.023	0.267	2
#10	0.362	0.333	0.116	0.098	0.060	0.050	0.053	0.034	0.198	0.124	0.032	0.042	0.025	0.313	2
#12	0.412	0.380	0.132	0.112	0.067	0.056	0.060	0.039	0.262	0.144	0.035	0.045	0.027	0.362	3
1/4	0.477	0.442	0.153	0.131	0.075	0.064	0.070	0.046	0.276	0.160	0.036	0.050	0.029	0.424	3
5/16	0.597	0.556	0.191	0.165	0.084	0.072	0.088	0.058	0.358	0.205	0.061	0.057	0.034	0.539	4
3/8	0.717	0.670	0.230	0.200	0.094	0.081	0.106	0.070	0.386	0.234	0.065	0.065	0.039	0.653	4
1/2	0.815	0.765	0.223	0.186	0.106	0.091	0.103	0.065	0.418	0.265	0.069	0.081	0.049	0.739	4

All dimensions are in inches.

SS Slotted Flat Head Machine Screw

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Diameter Length Item # Availability Price Quantity UOM

1/4

MFSS 40025

In Stock

$0.04005/EA

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#4-40 X 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.04005/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04005/ EA
6670	$0.03734/ EA
26670	$0.03526/ EA
106670	$0.02399/ EA

5/16

MFSS 40031

In Stock

$0.04005/EA

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#4-40 X 5/16 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.04005/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04005/ EA
6440	$0.03734/ EA
25750	$0.03526/ EA
102970	$0.02399/ EA

3/8

MFSS 40037

In Stock

$0.04005/EA

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#4-40 X 3/8 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.04005/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04005/ EA
5060	$0.03734/ EA
20210	$0.03526/ EA
80810	$0.02399/ EA

7/16

MFSS 40043

In Stock

$0.12014/EA

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#4-40 X 7/16 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.12014/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12014/ EA
4920	$0.11202/ EA
19670	$0.10578/ EA
78670	$0.07196/ EA

1/2

MFSS 40050

In Stock

$0.0801/EA

See Quantity Discounts

#4-40 X 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
4070	$0.07468/ EA
16270	$0.07052/ EA
65050	$0.04797/ EA

5/8

MFSS 40062

In Stock

$0.0801/EA

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#4-40 X 5/8 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
3340	$0.07468/ EA
13340	$0.07052/ EA
53340	$0.04797/ EA

3/4

MFSS 40075

In Stock

$0.0801/EA

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#4-40 X 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
2880	$0.07468/ EA
11500	$0.07052/ EA
45980	$0.04797/ EA

7/8

MFSS 40087

In Stock

$0.32038/EA

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#4-40 X 7/8 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.32038/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.32038/ EA
2530	$0.29873/ EA
10110	$0.28209/ EA
40410	$0.19189/ EA

MFSS 40100

In Stock

$0.07369/EA

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#4-40 X 1 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.07369/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.07369/ EA
2250	$0.06871/ EA
8970	$0.06488/ EA
35880	$0.04414/ EA

1 1/4

MFSS 40125

In Stock

$0.0801/EA

See Quantity Discounts

#4-40 X 1 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0801/ EA
1850	$0.07468/ EA
7390	$0.07052/ EA
29530	$0.04797/ EA

1 1/2

MFSS 40150

In Stock

$0.12014/EA

See Quantity Discounts

#4-40 X 1 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.12014/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12014/ EA
1570	$0.11202/ EA
6250	$0.10578/ EA
25000	$0.07196/ EA

5/16

3/4

MFSS0310075

In Stock

$0.33528/EA

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5/16-18 X 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.33528/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.33528/ EA
540	$0.31262/ EA
2160	$0.2952/ EA
9700	$0.20082/ EA

5/16

MFSS0310100

In Stock

$0.54193/EA

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5/16-18 X 1 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.54193/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.54193/ EA
450	$0.5053/ EA
1770	$0.47715/ EA
7930	$0.32459/ EA

5/16

1 1/4

MFSS0310125

In Stock

$0.4704/EA

See Quantity Discounts

5/16-18 X 1 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.4704/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.4704/ EA
380	$0.43861/ EA
1490	$0.41417/ EA
6700	$0.28175/ EA

5/16

1 1/2

MFSS0310150

In Stock

$0.28514/EA

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5/16-18 X 1 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.28514/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28514/ EA
330	$0.26587/ EA
1290	$0.25106/ EA
5810	$0.17078/ EA

5/16

1 3/4

MFSS0310175

In Stock

$0.83861/EA

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5/16-18 X 1 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.83861/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.83861/ EA
290	$0.78193/ EA
1140	$0.73836/ EA
5120	$0.50228/ EA

5/16

MFSS0310200

In Stock

$0.75691/EA

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5/16-18 X 2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.75691/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.75691/ EA
260	$0.70575/ EA
1020	$0.66643/ EA
4580	$0.45335/ EA

5/16

MFSS0310300

In Stock

$1.09131/EA

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5/16-18 X 3 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.09131/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.09131/ EA
180	$1.01755/ EA
720	$0.96086/ EA
3220	$0.65363/ EA

5/16

MFSS0310500

Out Of Stock

$8.81057/EA

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5/16-18 X 5 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$8.81057/EA

Qty

Out Of Stock

Product Detail

Quantity	Price
Quantity	Price
1	$8.81057/ EA
120	$8.21509/ EA
450	$7.7574/ EA
2020	$5.27704/ EA

3/8

3/4

MFSS0370075

In Stock

$0.81566/EA

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3/8-16 X 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.81566/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.81566/ EA
350	$0.76053/ EA
1390	$0.71816/ EA
6250	$0.48853/ EA

3/8

MFSS0370100

In Stock

$0.57281/EA

See Quantity Discounts

3/8-16 X 1 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.57281/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.57281/ EA
290	$0.53409/ EA
1150	$0.50434/ EA
5160	$0.34308/ EA

3/8

1 1/4

MFSS0370125

In Stock

$1.26904/EA

See Quantity Discounts

3/8-16 X 1 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.26904/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.26904/ EA
250	$1.18327/ EA
980	$1.11735/ EA
4390	$0.76009/ EA

3/8

1 1/2

MFSS0370150

In Stock

$0.88106/EA

See Quantity Discounts

3/8-16 X 1 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.88106/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.88106/ EA
220	$0.82151/ EA
850	$0.77574/ EA
3830	$0.5277/ EA

3/8

1 3/4

MFSS0370175

In Stock

$0.76091/EA

See Quantity Discounts

3/8-16 X 1 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.76091/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.76091/ EA
190	$0.70948/ EA
760	$0.66996/ EA
3390	$0.45574/ EA

3/8

MFSS0370200

In Stock

$0.98286/EA

See Quantity Discounts

3/8-16 X 2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.98286/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.98286/ EA
170	$0.91643/ EA
680	$0.86537/ EA
3040	$0.58868/ EA

3/8

MFSS0370300

Out Of Stock

$0.80096/EA

See Quantity Discounts

3/8-16 X 3 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.80096/EA

Qty

Out Of Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.80096/ EA
120	$0.74683/ EA
480	$0.70522/ EA
2150	$0.47973/ EA

3/8

MFSS0370400

Out Of Stock

$0.80096/EA

See Quantity Discounts

3/8-16 X 4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.80096/EA

Qty

Out Of Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.80096/ EA
100	$0.74683/ EA
370	$0.70522/ EA
1670	$0.47973/ EA

1/2

3/4

MFSS0500075

In Stock

$1.60192/EA

See Quantity Discounts

1/2-13 X 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.60192/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.60192/ EA
270	$1.49365/ EA
1050	$1.41044/ EA
4710	$0.95946/ EA

1/2

MFSS0500100

Out Of Stock

$1.33761/EA

See Quantity Discounts

1/2-13 X 1 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.33761/EA

Qty

Out Of Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.33761/ EA
200	$1.2472/ EA
780	$1.17772/ EA
3480	$0.80115/ EA

1/2

1 1/2

MFSS0500150

In Stock

$1.47909/EA

See Quantity Discounts

1/2-13 X 1 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.47909/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.47909/ EA
130	$1.37913/ EA
510	$1.30229/ EA
2290	$0.8859/ EA

1/2

MFSS0500200

In Stock

$2.20264/EA

See Quantity Discounts

1/2-13 X 2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$2.20264/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.20264/ EA
110	$2.05377/ EA
410	$1.93935/ EA
1810	$1.31926/ EA

1/2

2 1/2

MFSS0500250

In Stock

$1.57497/EA

See Quantity Discounts

1/2-13 X 2 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.57497/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.57497/ EA
80	$1.46852/ EA
320	$1.38671/ EA
1430	$0.94332/ EA

1/2

MFSS0500300

In Stock

$1.92231/EA

See Quantity Discounts

1/2-13 X 3 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$1.92231/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.92231/ EA
70	$1.79238/ EA
270	$1.69252/ EA
1210	$1.15136/ EA

1/2

MFSS0500400

In Stock

$4.70897/EA

See Quantity Discounts

1/2-13 X 4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$4.70897/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.70897/ EA
50	$4.3907/ EA
200	$4.14609/ EA
890	$2.82041/ EA