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Dimensions of Undercut 82-deg Flat Countersunk Head machine Screws (ASTM F837 F468)

Achieve precision and reliability with Undercut 82-degree Flat Countersunk Head Machine Screws, meeting ASME B 18.6.3 - 2013 standards. Whether in automotive, aerospace, or machinery, these screws deliver consistent performance and secure fastening.

Model:ASME B 18.6.3

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Product Description

Precision Engineering: Undercut 82-degree Flat Countersunk Head Machine Screws adhere to the exacting specifications outlined in ASME B 18.6.3 - 2013, ensuring precise dimensions and consistent performance. Compliant with ASTM F837 and F468 standards, these screws guarantee reliability in demanding applications.

Undercut Design: The undercut feature of these screws provides a flush fit when installed, minimizing protrusion for a sleek and streamlined appearance. This design also enhances the screw's ability to distribute load forces evenly, contributing to improved stability and reliability.

Flat Countersunk Head: Engineered with a flat countersunk head, these screws create a flush surface when installed, reducing the risk of snagging and providing a clean finish. The flat head design offers ample surface area for bearing loads, enhancing the overall strength of the fastened joint.

Versatile Application: Undercut 82-degree Flat Countersunk Head Machine Screws are suitable for a wide range of applications, including automotive, aerospace, and machinery. Their precise dimensions and robust construction make them ideal for critical fastening tasks where reliability is paramount.

Thread Size
d

10#

12#

1/4

5/16

3/8

7/16

1/2

d	Nominal Size
PP	UNC
L ^②
d_k	max
d_k	min
k	max
k	min
n	max
n	min
t	max
t	min

0.0600	0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1640	0.1900	0.2160	0.2500	0.3125	0.3750	0.4375	0.5000
-	64	56	48	40	40	32	32	24	24	20	18	16	14	13
1/8	1/8	1/8	1/8	3/16	3/16	3/16	1/4	5/16	3/8	7/16	1/2	9/16	5/8	3/4
0.112	0.137	0.162	0.187	0.212	0.237	0.262	0.312	0.362	0.412	0.477	0.597	0.717	0.760	0.815
0.096	0.120	0.144	0.167	0.191	0.215	0.238	0.285	0.333	0.380	0.442	0.556	0.670	0.715	0.765
0.025	0.031	0.036	0.042	0.047	0.053	0.059	0.070	0.081	0.092	0.107	0.134	0.161	0.156	0.156
0.018	0.023	0.028	0.033	0.038	0.043	0.048	0.058	0.068	0.078	0.092	0.116	0.140	0.133	0.130
0.023	0.026	0.031	0.035	0.039	0.043	0.048	0.054	0.060	0.067	0.075	0.084	0.094	0.094	0.106
0.016	0.019	0.023	0.027	0.031	0.035	0.039	0.045	0.050	0.056	0.064	0.072	0.081	0.081	0.091
0.011	0.014	0.016	0.019	0.022	0.024	0.027	0.032	0.037	0.043	0.050	0.062	0.075	0.072	0.072
0.007	0.009	0.011	0.012	0.014	0.016	0.017	0.021	0.024	0.028	0.032	0.041	0.049	0.045	0.046

①,Edge of head may be rounded or flat.
②,Screws of these lengths and shorter shall have undercut heads.
④,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.
⑤,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.

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