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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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1/4

MRSB 40025

In Stock

$0.05042/EA

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#4-40 X 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.05042/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.05042/EA
4550	$0.04701/EA
18190	$0.04439/EA
72730	$0.0302/EA

3/8

MRSB 40037

In Stock

$0.0801/EA

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#4-40 X 3/8 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.0801/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.0801/EA
3580	$0.07468/EA
14290	$0.07052/EA
57150	$0.04797/EA

1/2

MRSB 40050

In Stock

$0.09067/EA

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#4-40 X 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.09067/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.09067/EA
2780	$0.08454/EA
11120	$0.07983/EA
44450	$0.05431/EA

3/4

MRSB 40075

In Stock

$0.08847/EA

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#4-40 X 3/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.08847/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.08847/EA
2180	$0.08249/EA
8700	$0.07789/EA
34790	$0.05299/EA

MRSB 40100

In Stock

$0.05006/EA

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#4-40 X 1 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.05006/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05006/EA
1860	$0.04668/EA
7410	$0.04408/EA
29630	$0.02998/EA

1 1/2

MRSB 40150

In Stock

$0.57789/EA

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#4-40 X 1 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.57789/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.57789/EA
1390	$0.53883/EA
5560	$0.50882/EA
22230	$0.34613/EA

#10

1/4

MRSB1020025

In Stock

$0.16019/EA

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#10-24 X 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.16019/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.16019/EA
1120	$0.14937/EA
4450	$0.14104/EA
17780	$0.09595/EA

#10

3/8

MRSB1020037

In Stock

$0.16019/EA

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#10-24 X 3/8 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.16019/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16019/EA
1930	$0.14937/EA
7700	$0.14104/EA
34620	$0.09595/EA

#10

1/2

MRSB1020050

In Stock

$0.24902/EA

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#10-24 X 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.24902/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.24902/EA
1670	$0.23219/EA
6670	$0.21925/EA
30000	$0.14915/EA

#10

3/4

MRSB1020075

In Stock

$0.25967/EA

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#10-24 X 3/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.25967/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.25967/EA
1340	$0.24212/EA
5340	$0.22863/EA
24000	$0.15553/EA

#10

MRSB1020100

In Stock

$0.45935/EA

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#10-24 X 1 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.45935/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.45935/EA
1120	$0.4283/EA
4450	$0.40444/EA
20000	$0.27513/EA

#10

1 1/4

MRSB1020125

In Stock

$0.6966/EA

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#10-24 X 1 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.6966/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.6966/EA
920	$0.64951/EA
3670	$0.61333/EA
16520	$0.41722/EA

#10

1 1/2

MRSB1020150

In Stock

$1.18018/EA

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#10-24 X 1 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$1.18018/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.18018/EA
830	$1.10041/EA
3310	$1.0391/EA
14880	$0.70686/EA

#10

1 3/4

MRSB1020175

In Stock

$0.40048/EA

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#10-24 X 1 3/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.40048/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.40048/EA
740	$0.37341/EA
2950	$0.35261/EA
13240	$0.23987/EA

#10

MRSB1020200

In Stock

$0.24029/EA

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#10-24 X 2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.24029/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$0.24029/EA
670	$0.22405/EA
2670	$0.21157/EA
12000	$0.14392/EA

#10

2 1/2

MRSB1020250

In Stock

$0.48058/EA

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#10-24 X 2 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.48058/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.48058/EA
550	$0.4481/EA
2180	$0.42313/EA
9790	$0.28784/EA

#10

1/4

MRSB1030025

In Stock

$0.0853/EA

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#10-32 X 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.0853/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0853/EA
1070	$0.07954/EA
4260	$0.07511/EA
17030	$0.05109/EA

#10

3/8

MRSB1030037

In Stock

$0.04005/EA

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#10-32 X 3/8 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.04005/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04005/EA
1860	$0.03734/EA
7410	$0.03526/EA
33340	$0.02399/EA

#10

1/2

MRSB1030050

In Stock

$0.24285/EA

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#10-32 X 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.24285/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.24285/EA
1590	$0.22644/EA
6350	$0.21382/EA
28580	$0.14545/EA

#10

3/4

MRSB1030075

In Stock

$0.30865/EA

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#10-32 X 3/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.30865/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.30865/EA
1250	$0.28779/EA
5000	$0.27176/EA
22500	$0.18486/EA

#10

MRSB1030100

In Stock

$0.44289/EA

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#10-32 X 1 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.44289/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.44289/EA
1040	$0.41296/EA
4130	$0.38995/EA
18560	$0.26527/EA

#10

1 1/4

MRSB1030125

In Stock

$0.2982/EA

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#10-32 X 1 1/4 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.2982/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.2982/EA
880	$0.27804/EA
3510	$0.26255/EA
15790	$0.1786/EA

#10

1 1/2

MRSB1030150

In Stock

$0.48058/EA

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#10-32 X 1 1/2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.48058/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.48058/EA
780	$0.4481/EA
3110	$0.42313/EA
13960	$0.28784/EA

#10

MRSB1030200

In Stock

$0.58254/EA

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#10-32 X 2 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.58254/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.58254/EA
620	$0.54317/EA
2460	$0.51291/EA
11050	$0.34891/EA

#10

MRSB1030300

In Stock

$0.80096/EA

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#10-32 X 3 BRASS SLOTTED ROUND HEAD MACHINE SCREW

$0.80096/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.80096/EA
440	$0.74683/EA
1740	$0.70522/EA
7800	$0.47973/EA

5/16

1/2

MRSB0310050

In Stock

$0.64077/EA

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

$0.64077/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.64077/EA
460	$0.59746/EA
1820	$0.56417/EA
8190	$0.38379/EA

5/16

3/4

MRSB0310075

In Stock

$0.72087/EA

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

$0.72087/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.72087/EA
390	$0.67214/EA
1550	$0.6347/EA
6950	$0.43176/EA

5/16

MRSB0310100

In Stock

$0.76091/EA

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

$0.76091/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.76091/EA
330	$0.70948/EA
1310	$0.66996/EA
5870	$0.45574/EA

5/16

1 1/4

MRSB0310125

In Stock

$0.92111/EA

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

$0.92111/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.92111/EA
290	$0.85885/EA
1140	$0.811/EA
5130	$0.55169/EA

5/16

1 1/2

MRSB0310150

In Stock

$1.04125/EA

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

$1.04125/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.04125/EA
260	$0.97087/EA
1010	$0.91678/EA
4540	$0.62365/EA

5/16

MRSB0310200

In Stock

$1.86848/EA

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

$1.86848/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.86848/EA
210	$1.7422/EA
830	$1.64513/EA
3700	$1.11912/EA

5/16

MRSB0310300

In Stock

$1.60192/EA

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

$1.60192/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.60192/EA
150	$1.49365/EA
600	$1.41044/EA
2700	$0.95946/EA