ASME B18.6.3 Type 1A Cross Recessed Fillister Head Machine Screws – Adfast Components

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Explore Adfast Components for precision-engineered fasteners, offering hot & cold forged solutions with metric sizes from M3 to M100 for diverse industrial needs.

materials

Carbon Steel

Alloy Steel

Stainless Steel

Super Alloys

Non Ferrous Metal & Alloys

High Performance Nickel Alloys

Copper Alloys

Technical

Specification

Standard

Weight

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Threads
Contact

Home
About
Product
Product

Adfast Components offers precision-engineered hot and cold forged fasteners ranging from M3 to M100, ensuring superior strength and reliability. Designed to meet diverse industrial standards, our components guarantee durability and performance.

Precision Components

Pumps & Valves

Automobile

Customised

Electronic

Medical

Contract Manufacturing

3D Printing & Additive Manufacturing

Fastener

Bolts

Coated Fasteners

Washer

Stud Bolts

Nuts

Screws
Resources
Resources

Explore Adfast Components for precision-engineered fasteners, offering hot & cold forged solutions with metric sizes from M3 to M100 for diverse industrial needs.

materials

Carbon Steel

Alloy Steel

Stainless Steel

Super Alloys

Non Ferrous Metal & Alloys

High Performance Nickel Alloys

Copper Alloys

Technical

Specification

Standard

Weight

Applications

Threads
Contact

ASME B18.6.3 Type 1A Cross Recessed Fillister Head Machine Screws

Dimensions of ASME B18.6.3 Type 1A Cross Recessed Fillister Head Machine Screws

Nominal Size or Basic Screw Diameter	Head Diameter, A		Head Side Height, H		Total Head Height, O		Recess Diameter, M	Recess Depth, T	Recess Width, N	Driver Size	Recess Penetration Gaging Depth
Nominal Size or Basic Screw Diameter	Max	Min	Max	Min	Max	Min	Recess Diameter, M	Recess Depth, T	Recess Width, N	Driver Size	Max	Min
0	0.096	0.083	0.043	0.038	0.055	0.047	0.060	0.032	0.018	0	0.033	0.017
1	0.118	0.104	0.053	0.045	0.066	0.058	0.067	0.039	0.018	0	0.040	0.024
2	0.140	0.124	0.062	0.053	0.083	0.066	0.097	0.056	0.028	1	0.053	0.037
3	0.161	0.145	0.070	0.061	0.095	0.077	0.105	0.065	0.029	1	0.062	0.046
4	0.183	0.166	0.079	0.069	0.107	0.088	0.115	0.075	0.029	1	0.072	0.056
5	0.205	0.187	0.088	0.078	0.120	0.100	0.133	0.061	0.040	2	0.054	0.036
6	0.226	0.208	0.096	0.086	0.132	0.111	0.155	0.083	0.040	2	0.076	0.058
8	0.270	0.250	0.113	0.102	0.156	0.133	0.170	0.099	0.041	2	0.092	0.074
10	0.313	0.292	0.130	0.118	0.180	0.156	0.186	0.115	0.041	2	0.108	0.090
12	0.357	0.334	0.148	0.134	0.205	0.178	0.247	0.130	0.056	3	0.117	0.099
1/4	0.414	0.389	0.170	0.155	0.237	0.207	0.266	0.150	0.057	3	0.137	0.119
5/16	0.518	0.490	0.211	0.194	0.295	0.262	0.308	0.193	0.057	3	0.181	0.163
3/8	0.622	0.590	0.253	0.233	0.355	0.315	0.370	0.219	0.086	4	0.201	0.183
7/16	0.625	0.589	0.265	0.242	0.368	0.321	0.392	0.242	0.086	4	0.224	0.206
1/2	0.750	0.710	0.297	0.273	0.412	0.362	0.413	0.264	0.086	4	0.246	0.228
9/16	0.812	0.768	0.336	0.308	0.466	0.410	0.444	0.295	0.087	4	0.277	0.259
5/8	0.875	0.827	0.375	0.345	0.521	0.461	0.558	0.322	0.098	5	0.295	0.274
3/4	1.000	0.945	0.441	0.406	0.612	0.542	0.602	0.368	0.098	5	0.341	0.320

Notes :

A slight rounding of the edges at the periphery of the head shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum head diameter.
Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.