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Brass 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 brass.

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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.

Brass Slotted Round Head Machine Screw

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Diameter Length Item # Availability Price Quantity UOM

1/4

MRSB0250025

In Stock

$0.29135/EA

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1/4-20 X 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.29135/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.29135/ EA
1050	$0.27166/ EA
4170	$0.25652/ EA
16670	$0.1745/ EA

1/4

3/8

MRSB0250037

In Stock

$0.18022/EA

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

$0.18022/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$0.18022/ EA
920	$0.16804/ EA
3670	$0.15867/ EA
16520	$0.10794/ EA

1/4

1/2

MRSB0250050

In Stock

$0.24121/EA

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

$0.24121/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.24121/ EA
800	$0.22491/ EA
3180	$0.21238/ EA
14290	$0.14447/ EA

1/4

3/4

MRSB0250075

In Stock

$0.4855/EA

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

$0.4855/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.4855/ EA
680	$0.45269/ EA
2710	$0.42747/ EA
12170	$0.29079/ EA

1/4

MRSB0250100

In Stock

$0.66736/EA

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1/4-20 X 1 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.66736/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.66736/ EA
580	$0.62226/ EA
2290	$0.58759/ EA
10290	$0.39971/ EA

1/4

1 1/4

MRSB0250125

In Stock

$0.16019/EA

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1/4-20 X 1 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.16019/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16019/ EA
500	$0.14937/ EA
1980	$0.14104/ EA
8870	$0.09595/ EA

1/4

1 1/2

MRSB0250150

In Stock

$0.31886/EA

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

$0.31886/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.31886/ EA
440	$0.29731/ EA
1740	$0.28075/ EA
7800	$0.19098/ EA

1/4

MRSB0250200

In Stock

$1.29888/EA

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

$1.29888/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.29888/ EA
360	$1.21109/ EA
1410	$1.14362/ EA
6320	$0.77796/ EA

1/4

2 1/2

MRSB0250250

In Stock

$0.85743/EA

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

$0.85743/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.85743/ EA
300	$0.79948/ EA
1170	$0.75494/ EA
5250	$0.51355/ EA

1/4

MRSB0250300

In Stock

$1.26552/EA

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

$1.26552/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.26552/ EA
250	$1.17999/ EA
1000	$1.11425/ EA
4500	$0.75798/ EA

Brass Slotted Round Head Machine Screw

Technical Data

Dimensional Specifications

Dimensional SpecificationsType 2A Threads for Machine Screws

Dimensional SpecificationsSlotted Round Head for Machine Screws

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1/4-20 X 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

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

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1/4-20 X 1 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

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

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