English 
ASME/ANSI B18.6.3:2010 Oval Countersunk Head Slotted Screw
ASME/ANSI B18.6.3:2010 Oval Countersunk Head Slotted Screw combines a slotted drive with a oval countersunk head, making it suitable for fastening points that require reliable clamping, removable maintenance, and standardized assembly. The ASME/ANSI framework suits U.S.-standard projects, export equipment, and cross-regional supply chains, supporting smooth alignment between engineering drawings, purchasing lists, and quality inspection.
From an assembly perspective, the slot is easy to identify and works with simple tools, which supports routine maintenance and manual assembly. At the same time, combines a countersunk bearing surface with a rounded top, reducing projection while maintaining a finished appearance, so the screw can provide stable fastening performance across different sheet thicknesses, appearance requirements, and space limitations.
It suits panels, housings, decorative joints, and visible assemblies requiring both a smooth transition and a refined appearance. For batch assembly, the product can be tailored around workstation tools, tightening torque, visual grade, and packaging method to reduce sorting cost and improve assembly consistency.
Unit: inch
|
Thread size d |
L |
dk |
k Nominal |
n |
t |
||||
|
max |
min |
max |
min |
max |
min |
||||
|
#0 |
1/8 |
0.112 |
0.096 |
0.035 |
0.023 |
0.016 |
0.028 |
0.022 |
|
|
#1 |
1/8 |
0.137 |
0.12 |
0.043 |
0.026 |
0.019 |
0.034 |
0.027 |
|
|
#2 |
1/8 |
0.162 |
0.144 |
0.051 |
0.031 |
0.023 |
0.04 |
0.033 |
|
|
#3 |
1/8 |
0.187 |
0.167 |
0.059 |
0.035 |
0.027 |
0.047 |
0.038 |
|
|
#4 |
3/16 |
0.212 |
0.191 |
0.067 |
0.039 |
0.031 |
0.053 |
0.043 |
|
|
#5 |
3/16 |
0.237 |
0.215 |
0.075 |
0.043 |
0.035 |
0.059 |
0.048 |
|
|
#6 |
3/16 |
0.262 |
0.238 |
0.083 |
0.048 |
0.039 |
0.065 |
0.053 |
|
|
#8 |
1/4 |
0.312 |
0.285 |
0.1 |
0.054 |
0.045 |
0.078 |
0.064 |
|
|
#10 |
5/16 |
0.362 |
0.333 |
0.116 |
0.06 |
0.05 |
0.09 |
0.074 |
|
|
#12 |
3/8 |
0.412 |
0.38 |
0.132 |
0.067 |
0.056 |
0.103 |
0.085 |
|
|
1/4 |
7/16 |
0.477 |
0.442 |
0.153 |
0.075 |
0.064 |
0.119 |
0.098 |
|
|
5/16 |
1/2 |
0.597 |
0.556 |
0.191 |
0.084 |
0.072 |
0.149 |
0.124 |
|
|
3/8 |
9/16 |
0.717 |
0.67 |
0.23 |
0.094 |
0.081 |
0.179 |
0.149 |
|
|
7/16 |
5/8 |
0.76 |
0.715 |
0.223 |
0.094 |
0.081 |
0.184 |
0.154 |
|
|
1/2 |
3/4 |
0.815 |
0.765 |
0.223 |
0.106 |
0.091 |
0.204 |
0.169 |
|
OUR PRODUCTS
Related Products
ABOUT US
Hangzhou Better Fastener Technology Limited
Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010.
The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.
With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.
Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time delivery
OUR CERTIFICATE
Certificate Of Honour
NEWS
Latest News
CONTACT DETAILS
-
Address：Room 1901-4, Building 1, Eastern Chuangzhi Mansion, Baiyang Street, Qiantang District, Hangzhou City, Zhejiang Province, China
-
phone：+86-0571 85382212
-
E-Mail：betterfastener@gmail.com
-
Whatsapp：+86 15372362589
QUICK LINK
PRODUCTS
QR CODE
Copyright © 2026 Better Fastener Industry Co., Ltd. All Rights Reserved.
