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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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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

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#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

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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

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#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

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#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

1/4

MFSS 80025

In Stock

$0.05066/EA

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#8-32 X 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.05066/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05066/EA
1980	$0.04724/EA
7910	$0.04461/EA
31630	$0.03034/EA

5/16

MFSS 80031

In Stock

$0.02803/EA

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#8-32 X 5/16 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.02803/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.02803/EA
1790	$0.02614/EA
7140	$0.02468/EA
28530	$0.01679/EA

3/8

MFSS 80037

In Stock

$0.04005/EA

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#8-32 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
1960	$0.03734/EA
7820	$0.03526/EA
31250	$0.02399/EA

1/2

MFSS 80050

In Stock

$0.07012/EA

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#8-32 X 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.07012/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.07012/EA
1610	$0.06538/EA
6440	$0.06174/EA
25730	$0.042/EA

5/8

MFSS 80062

In Stock

$0.12014/EA

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#8-32 X 5/8 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.12014/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12014/EA
1370	$0.11202/EA
5470	$0.10578/EA
21860	$0.07196/EA

3/4

MFSS 80075

In Stock

$0.10469/EA

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#8-32 X 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.10469/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.10469/EA
1190	$0.09761/EA
4760	$0.09217/EA
19010	$0.0627/EA

MFSS 80100

In Stock

$0.0865/EA

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#8-32 X 1 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0865/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0865/EA
1880	$0.08066/EA
7500	$0.07616/EA
33710	$0.05181/EA

1 1/4

MFSS 80125

In Stock

$0.0817/EA

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#8-32 X 1 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0817/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0817/EA
1560	$0.07618/EA
6220	$0.07193/EA
27960	$0.04893/EA

1 1/2

MFSS 80150

In Stock

$0.18558/EA

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#8-32 X 1 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.18558/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.18558/EA
1330	$0.17304/EA
5300	$0.1634/EA
23810	$0.11115/EA

1 3/4

MFSS 80175

In Stock

$0.23969/EA

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#8-32 X 1 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.23969/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.23969/EA
1160	$0.22349/EA
4620	$0.21104/EA
20790	$0.14356/EA

MFSS 80200

In Stock

$0.26832/EA

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#8-32 X 2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.26832/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.26832/EA
1000	$0.25019/EA
3990	$0.23625/EA
17950	$0.16071/EA

1/4

3/8

MFSS0250037

In Stock

$0.20024/EA

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1/4-20 X 3/8 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.20024/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.20024/EA
1500	$0.18671/EA
5990	$0.1763/EA
26950	$0.11993/EA

1/4

1/2

MFSS0250050

In Stock

$0.0817/EA

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1/4-20 X 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.0817/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0817/EA
1380	$0.07618/EA
5520	$0.07193/EA
24830	$0.04893/EA

1/4

3/4

MFSS0250075

In Stock

$0.12891/EA

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1/4-20 X 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.12891/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12891/EA
930	$0.1202/EA
3700	$0.1135/EA
16640	$0.07721/EA

1/4

7/8

MFSS0250087

In Stock

$0.16019/EA

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1/4-20 X 7/8 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.16019/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16019/EA
880	$0.14937/EA
3520	$0.14104/EA
15810	$0.09595/EA

1/4

MFSS0250100

In Stock

$0.14614/EA

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1/4-20 X 1 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.14614/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.14614/EA
750	$0.13626/EA
2990	$0.12867/EA
13460	$0.08753/EA

1/4

1 1/4

MFSS0250125

In Stock

$0.23825/EA

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1/4-20 X 1 1/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.23825/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.23825/EA
620	$0.22214/EA
2450	$0.20977/EA
11020	$0.1427/EA

1/4

1 1/2

MFSS0250150

In Stock

$0.30877/EA

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1/4-20 X 1 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.30877/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.30877/EA
550	$0.2879/EA
2170	$0.27186/EA
9730	$0.18494/EA

1/4

1 3/4

MFSS0250175

In Stock

$0.34237/EA

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1/4-20 X 1 3/4 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.34237/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.34237/EA
480	$0.31923/EA
1900	$0.30145/EA
8540	$0.20506/EA

1/4

MFSS0250200

In Stock

$0.29804/EA

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1/4-20 X 2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.29804/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.29804/EA
430	$0.27789/EA
1700	$0.26241/EA
7620	$0.17851/EA

1/4

2 1/2

MFSS0250250

3-5 Working Days

$0.48538/EA

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1/4-20 X 2 1/2 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.48538/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.48538/EA
350	$0.45258/EA
1400	$0.42736/EA
6260	$0.29072/EA

1/4

MFSS0250300

In Stock

$0.63468/EA

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1/4-20 X 3 STAINLESS STEEL SLOTTED FLAT HEAD MACHINE SCREW

$0.63468/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.63468/EA
300	$0.59178/EA
1190	$0.55882/EA
5320	$0.38014/EA