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Plain (Unslotted) and Slotted Regular and Large Hex Head Screws [Table 29] (ASTM F837, F468)

Choose plain and slotted regular and large hex head screws for versatile fastening solutions that offer strength, reliability, and compatibility with a wide range of applications. Trust in their quality and performance for your next project.

Model:ASME B 18.6.3

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Product Description

[276]

Versatile Design Options: Plain (unslotted) and slotted regular and large hex head screws offer versatile design options suitable for various applications. Whether you need a standard hex head or a larger head for increased torque or bearing surface, these screws provide flexibility to meet your specific requirements.

Material Compatibility: Manufactured to ASTM F837 and F468 standards, these screws are available in a range of materials, ensuring compatibility with different environments and applications. Choose from various grades and finishes to achieve the desired level of corrosion resistance and durability.

Enhanced Fastening Strength: The hex head design provides enhanced fastening strength, allowing for secure and reliable connections. Slotted options offer additional convenience for manual tightening or loosening, making them suitable for a wide range of assembly and repair tasks.

Wide Range of Sizes: With options for regular and large hex heads, as well as different thread sizes and lengths, these screws can accommodate diverse project requirements. Whether you need small screws for precision applications or larger ones for heavy-duty tasks, there's a size available to suit your needs.

Applications Across Industries: From construction and automotive to industrial machinery and electronics, plain and slotted regular and large hex head screws find applications across various industries. Their versatility and reliability make them indispensable for both professional and DIY projects.

Quality Assurance: Manufactured to stringent ASTM standards, these screws undergo rigorous quality control measures to ensure consistency and performance. You can rely on their quality and durability for demanding applications where precision and reliability are paramount.

Thread Size
d

10#

d	Nominal Size
PP	UNC
s	Regular Head	min
		max
	Large Head	min
		max
e	Regular Head	min
	Large Head	min
k	max
	min
n	max
	min
t	max
	min

0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900
64	56	48	40	40	32	-	32	24
0.125	0.125	0.188	0.188	0.188	0.250	0.250	0.250	0.312
0.120	0.120	0.181	0.181	0.181	0.244	0.244	0.244	0.305
-	-	-	0.219	0.250	-	-	0.312	-
-	-	-	0.213	0.244	-	-	0.305	-
0.134	0.134	0.202	0.202	0.202	0.272	0.272	0.272	0.340
-	-	-	0.238	0.272	-	-	0.340	-
0.044	0.050	0.055	0.060	0.070	0.093	0.093	0.110	0.120
0.036	0.040	0.044	0.049	0.058	0.080	0.080	0.096	0.105
-	-	-	0.039	0.044	0.048	0.048	0.054	0.060
-	-	-	0.031	0.035	0.039	0.039	0.045	0.050
-	-	-	0.036	0.042	0.046	0.054	0.066	0.072
-	-	-	0.025	0.030	0.033	0.040	0.052	0.057

Thread Size
d

12#

14#

1/4

5/16

20#

24#

3/8

7/16

1/2

d	Nominal Size
PP	UNC
s	Regular Head	min
		max
	Large Head	min
		max
e	Regular Head	min
	Large Head	min
k	max
	min
n	max
	min
t	max
	min

0.2160	0.2420	0.2500	0.3125	0.3200	0.3720	0.3750	0.4375	0.5000
24	-	20	18	-	-	16	14	13
0.312	0.375	0.375	0.500	0.500	0.562	0.562	0.625	0.750
0.305	0.367	0.367	0.489	0.489	0.551	0.551	0.610	0.735
0.375	0.438	0.438	-	-	-	-	-	-
0.367	0.428	0.428	-	-	-	-	-	-
0.340	0.409	0.409	0.545	0.545	0.614	0.614	0.682	0.820
0.409	0.477	0.477	-	-	-	-	-	-
0.155	0.190	0.190	0.230	0.230	0.295	0.295	0.348	0.400
0.139	0.172	0.172	0.208	0.208	0.270	0.270	0.321	0.367
0.067	0.075	0.075	0.084	0.084	0.094	0.094	-	-
0.056	0.064	0.064	0.072	0.072	0.081	0.081	-	-
0.093	0.101	0.101	0.122	0.122	0.156	0.156	-	-
0.077	0.083	0.083	0.100	0.100	0.131	0.131	-	-

②,A slight rounding of all edges and corners of the heax surface of indented hex heads shall be permissible, provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flat dimension.
③,Unless otherwise specified by purchaser, hex head machine screws are not slotted.
④,7#,14#, 20#, 24# are for tapping screws only.
⑤,Unless otherwise specified by the purchaser, rgular hex heads shall be funished, and both regular and large head styles may be intented head, trimmed head, or fully upset head construction, at the option of the manufacture.
⑥,Machine Screw Length of Thread
1) Sizes No.5 and smaller.
Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the
bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have
full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer
nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in.
2) Sizes No.6 and smaller.
Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the
bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have
full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer
nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.
⑦,The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread.

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