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SS Slotted Round 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 round head offers a smooth, rounded head design with a slotted drive. 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 Round Head for Machine Screws

Slotted Round Head for Machine Screws dimensions

ASME B18.6.3-2013
Nominal Size	A		H		J		T		M		G	N	Phillips Drive Size
	Head Dimensions				Slot Dimensions				Phillips Dimensions
	Head Dimensions				Slot Dimensions				Phillips Dimensions
	Diameter		Height		Width		Depth		Diameter		Depth	Width
	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
#2	0.162	0.146	0.069	0.059	0.031	0.023	0.048	0.037	0.100	0.087	0.053	0.017	1
#3	0.187	0.169	0.078	0.067	0.035	0.027	0.053	0.040	0.109	0.096	0.062	0.018	1
#4	0.211	0.193	0.086	0.075	0.039	0.031	0.058	0.044	0.118	0.105	0.072	0.019	1
#5	0.236	0.217	0.095	0.083	0.043	0.035	0.063	0.047	0.154	0.141	0.074	0.027	2
#6	0.260	0.240	0.103	0.091	0.048	0.039	0.068	0.051	0.162	0.149	0.084	0.027	2
#8	0.309	0.287	0.120	0.107	0.054	0.045	0.077	0.058	0.178	0.165	0.101	0.030	2
#10	0.359	0.334	0.137	0.123	0.060	0.050	0.087	0.065	0.195	0.182	0.119	0.031	2
#12	0.408	0.382	0.153	0.139	0.067	0.056	0.096	0.073	0.249	0.236	0.125	0.032	3
1/4	0.472	0.443	0.175	0.160	0.075	0.064	0.109	0.082	0.268	0.255	0.147	0.034	3
5/16	0.590	0.557	0.216	0.198	0.084	0.072	0.132	0.099	0.308	0.295	0.187	0.040	3
3/8	0.708	0.670	0.256	0.237	0.094	0.081	0.155	0.117	0.387	0.374	0.228	0.064	4
1/2	0.813	0.766	0.355	0.332	0.106	0.091	0.211	0.159	0.416	0.403	0.256	0.068	4

All dimensions are in inches.

SS Slotted Round Head Machine Screw

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Diameter Length Item # Availability Price Quantity UOM

#12

1/2

MRSS1220050

In Stock

$0.61594/EA

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#12-24 X 1/2 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.61594/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.61594/ EA
1240	$0.57431/ EA
4940	$0.54231/ EA
22230	$0.36891/ EA

#12

3/4

MRSS1220075

In Stock

$0.16808/EA

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#12-24 X 3/4 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.16808/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16808/ EA
970	$0.15672/ EA
3850	$0.14799/ EA
17310	$0.10067/ EA

#12

MRSS1220100

In Stock

$0.92903/EA

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#12-24 X 1 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.92903/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.92903/ EA
820	$0.86624/ EA
3280	$0.81798/ EA
14760	$0.55644/ EA

#12

1 1/4

MRSS1220125

In Stock

$0.37713/EA

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#12-24 X 1 1/4 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.37713/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.37713/ EA
720	$0.35164/ EA
2880	$0.33205/ EA
12950	$0.22588/ EA

#12

1 1/2

MRSS1220150

In Stock

$0.35667/EA

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#12-24 X 1 1/2 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.35667/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.35667/ EA
650	$0.33256/ EA
2570	$0.31403/ EA
11540	$0.21362/ EA

#12

MRSS1220200

In Stock

$0.63765/EA

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#12-24 X 2 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.63765/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.63765/ EA
530	$0.59455/ EA
2100	$0.56142/ EA
9430	$0.38191/ EA

#12

2 1/2

MRSS1220250

In Stock

$0.71698/EA

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#12-24 X 2 1/2 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.71698/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.71698/ EA
450	$0.66852/ EA
1780	$0.63128/ EA
8000	$0.42943/ EA

1/4

MRSS0250025

In Stock

$0.16019/EA

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

$0.16019/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16019/ EA
1050	$0.14937/ EA
4170	$0.14104/ EA
16670	$0.09595/ EA

1/4

3/8

MRSS0250037

In Stock

$0.27689/EA

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

$0.27689/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.27689/ EA
920	$0.25818/ EA
3670	$0.24379/ EA
16520	$0.16584/ EA

1/4

1/2

MRSS0250050

In Stock

$0.17072/EA

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

$0.17072/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.17072/ EA
800	$0.15919/ EA
3180	$0.15032/ EA
14290	$0.10225/ EA

1/4

5/8

MRSS0250062

In Stock

$0.20024/EA

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1/4-20 X 5/8 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$0.20024/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.20024/ EA
750	$0.18671/ EA
2970	$0.1763/ EA
13340	$0.11993/ EA

1/4

3/4

MRSS0250075

In Stock

$0.12907/EA

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

$0.12907/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.12907/ EA
680	$0.12035/ EA
2710	$0.11365/ EA
12170	$0.07731/ EA

1/4

MRSS0250100

In Stock

$0.29079/EA

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

$0.29079/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.29079/ EA
580	$0.27114/ EA
2290	$0.25603/ EA
10290	$0.17417/ EA

1/4

1 1/4

MRSS0250125

In Stock

$0.21542/EA

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

$0.21542/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.21542/ EA
500	$0.20086/ EA
1980	$0.18967/ EA
8870	$0.12902/ EA

1/4

1 1/2

MRSS0250150

In Stock

$0.22379/EA

See Quantity Discounts

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

$0.22379/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.22379/ EA
440	$0.20866/ EA
1740	$0.19704/ EA
7800	$0.13404/ EA

1/4

1 3/4

MRSS0250175

In Stock

$0.35034/EA

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

$0.35034/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.35034/ EA
390	$0.32666/ EA
1560	$0.30846/ EA
6980	$0.20983/ EA

1/4

MRSS0250200

In Stock

$0.28911/EA

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

$0.28911/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28911/ EA
360	$0.26957/ EA
1410	$0.25455/ EA
6320	$0.17316/ EA

1/4

2 1/4

MRSS0250225

In Stock

$0.28034/EA

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

$0.28034/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28034/ EA
320	$0.26139/ EA
1280	$0.24683/ EA
5760	$0.16791/ EA

1/4

2 1/2

MRSS0250250

In Stock

$0.37365/EA

See Quantity Discounts

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

$0.37365/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.37365/ EA
300	$0.34839/ EA
1170	$0.32898/ EA
5250	$0.22379/ EA

1/4

MRSS0250300

In Stock

$0.54553/EA

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

$0.54553/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.54553/ EA
250	$0.50866/ EA
1000	$0.48032/ EA
4500	$0.32675/ EA

1/4

MRSS0250400

In Stock

$1.7316/EA

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

$1.7316/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.7316/ EA
200	$1.61456/ EA
780	$1.52461/ EA
3490	$1.03713/ EA

1/4

MRSS0250600

In Stock

$2.15102/EA

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1/4-20 X 6 STAINLESS STEEL SLOTTED ROUND HEAD MACHINE SCREW

$2.15102/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.15102/ EA
150	$2.00564/ EA
590	$1.8939/ EA
2640	$1.28834/ EA

5/16

1/2

MRSS0310050

In Stock

$0.40048/EA

See Quantity Discounts

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

$0.40048/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.40048/ EA
460	$0.37341/ EA
1820	$0.35261/ EA
8190	$0.23987/ EA

5/16

3/4

MRSS0310075

In Stock

$0.35699/EA

See Quantity Discounts

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

$0.35699/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.35699/ EA
390	$0.33286/ EA
1550	$0.31432/ EA
6950	$0.21382/ EA

5/16

MRSS0310100

In Stock

$0.32038/EA

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

$0.32038/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.32038/ EA
330	$0.29873/ EA
1310	$0.28209/ EA
5870	$0.19189/ EA

5/16

1 1/4

MRSS0310125

In Stock

$0.36043/EA

See Quantity Discounts

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

$0.36043/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.36043/ EA
290	$0.33607/ EA
1140	$0.31735/ EA
5130	$0.21588/ EA

5/16

1 1/2

MRSS0310150

In Stock

$0.40024/EA

See Quantity Discounts

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

$0.40024/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.40024/ EA
260	$0.37319/ EA
1010	$0.3524/ EA
4540	$0.23972/ EA

5/16

MRSS0310200

In Stock

$0.61169/EA

See Quantity Discounts

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

$0.61169/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.61169/ EA
210	$0.57035/ EA
830	$0.53858/ EA
3700	$0.36637/ EA

5/16

2 1/2

MRSS0310250

In Stock

$0.92111/EA

See Quantity Discounts

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

$0.92111/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.92111/ EA
180	$0.85885/ EA
700	$0.811/ EA
3110	$0.55169/ EA

5/16

MRSS0310300

In Stock

$1.15899/EA

See Quantity Discounts

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

$1.15899/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.15899/ EA
150	$1.08066/ EA
600	$1.02045/ EA
2700	$0.69417/ EA