Y Slot Screws

7/16/2022 admin

Y Slot Screw Head
T Slot Screws

Slotted and Phillips screwdrivers work with metric screws, but you must use metric hex keys with metric hex socket screws. Also, Phillips, square, hex and Torx® drive screws are popular because there's less chance for the driver to slip out and scratch finish work. Hex head, like hex cap screws, require a wrench or socket.

Like nails, screws are (usually) small pieces of hardware used to hold materials together. One of the main differences is that screws are designed to be able to be removed and replaced easily without damage to the screw itself or the material it connects. Most screws are made from some type of metal, and many are covered in a rustproof coating. Aside from material, screws differ in head shape, head type, threading and purpose.

Machine screws are designed to hold pieces of machinery together. Most machine screws require that the hole already be drilled and threaded, although there are a few types of machine screws capable of tapping their own holes. Like other screws, machine screws are available in a variety of shapes and sizes. Pan head machine screws are machine screws with heads that are flat on top and rounded on the sides. They're similar to oval head machine screws, which also have rounded sides; the difference is that oval head screws have a rounded top, too, as opposed to a flat top, and they have tapered bases. Both are commonly used for metal applications. Pan head machine screws can also be differentiated from flat head screws, which have flat tops, as well. However, flat head screws are tapered on the underside of the head so they can lie flush with the material they're driven into. Meanwhile, round head screws have flat bottoms with rounded heads, much like half a sphere. Round head screws can't sit flush with the material they're driven into; instead, their heads poke out like little bumps.

Doing the job right takes both a Joint File that cuts only on the edges and won't widen the slot as it deepens, and an Equalling File to clean up the slot sides and square the bottom. Available in matched, same-size pairs, 1 Joint and 1 Equalling. Plus, there's the Master Screw Slot Set with all twelve files to cover any slotting job.
Slot head screws are driven by a flat-bladed screwdriver. Cross-head or Phillips screws have an X-shaped slot and are driven by a cross-head screwdriver, designed originally in the 1930s for use with mechanical screwing machines, intentionally made so the driver will ride out, or cam out, under strain to prevent over-tightening.
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Pan head machine screws can be designed with a variety of head types, too. A slotted pan head machine screw has a single cut in the head for use with a straight screwdriver. Philips pan head machine screws have a cross cut into the top for use with a Philips screwdriver.

msflathead

82°
Flat Head

82° Undercut
Flat Head

100°
Flat Head

Torx® Drive
Flat Head

Square Drive
Flat Head

Pozidriv°
(Type 1A)
Flat Head

Head Dimensions for 82° Flat Head Machine Screws
ANSI B18.6.3 – 1998

Nominal Size	A		H		J		T		M	R	N	F		G	Phillips Driver Size
	Head Dimensions *				Slot Dimensions				Recess Dimensions			Protusion Above Gaging Diameter		Gaging Diameter
	Diameter		Height		Width		Depth		Dia	Depth	Width	Protusion Above Gaging Diameter
	Max	Min	Max	Min	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min
0	.112	.096	.035	.026	.023	.016	.015	.010	.062	.035	.014	.026	.016	.078	0
1	.137	.120	.043	.033	.026	.019	.019	.012	.070	.043	.015	.028	.016	.101	0
2	.162	.144	.051	.040	.031	.023	.023	.015	.096	.055	.017	.029	.017	.124	1
3	.187	.167	.059	.047	.035	.027	.027	.017	.100	.060	.018	.031	.018	.148	1
4	.212	.191	.067	.055	.039	.031	.030	.020	.122	.081	.018	.032	.019	.172	1
5	.237	.215	.075	.062	.043	.035	.034	.022	.148	.074	.027	.034	.020	.196	2
6	.262	.238	.083	.069	.048	.039	.038	.024	.168	.094	.029	.036	.021	.220	2
8	.312	.285	.100	.084	.054	.045	.045	.029	.182	.110	.030	.039	.023	.267	2
10	.362	.333	.116	.098	.060	.050	.053	.034	.198	.124	.032	.042	.025	.313	2
12	.412	.380	.132	.112	.067	.056	.060	.039	.262	.144	.035	.045	.027	.362	3
1/4	.477	.442	.153	.131	.075	.064	.070	.046	.276	.160	.036	.050	.029	.424	3
5/16	.597	.556	.191	.165	.084	.072	.088	.058	.358	.205	.061	.057	.0345	.539	4
3/8	.717	.670	.230	.200	.094	.081	.106	.070	.386	.234	.065	.065	.039	.653	4
1/2	.815	.765	.223	.186	.106	.091	.103	.065	.418	.265	.069	.081	.049	.739	4
* Edge of head may be rounded or flat.

Head Dimensions for 100° Flat Head Machine Screws
ANSI B18.6.3

Nominal Size	A		H		J		T		M	R	N	F		G	Phillips Driver Size
	Head Dimensions *				Slot Dimensions				Recess Dimensions			Protusion Above Gaging Diameter		Gaging Diameter
	Diameter		Height		Width		Depth		Dia	Depth	Width	Protusion Above Gaging Diameter
	Max	Min	Max	Min	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min
0	.112	.095	.026	.019	.023	.016	.013	.008	.054	.027	.013	.020	.012	.074	0
2	.162	.142	.037	.029	.031	.023	.019	.012	.088	.048	.012	.022	.014	.121	1
4	.212	.188	.049	.039	.039	.031	.024	.017	.110	.070	.018	.025	.016	.167	1
6	.262	.235	.060	.049	.048	.039	.030	.022	.148	.074	.027	.028	.017	.214	2
8	.312	.282	.072	.060	.054	.045	.036	.027	.162	.090	.028	.031	.019	.261	2
10	.362	.329	.083	.070	.060	.050	.042	.031	.178	.104	.030	.034	.021	.307	2
1/4	.477	.437	.110	.094	.075	.064	.055	.042	.240	.124	.033	.040	.025	.415	3
* Edge of head may be rounded or flat.

Y Slot Screw Head

Head Dimensions for Undercut Flat Head Machine Screws
ANSI B18.6.3

T Slot Screws

Nom Size	L	A		H		J		T		M	R	N	F		G	Phillips Driver Size
	These Lengths or Shorter are Undercut	Head Dimensions *				Slot Dimensions				Recess Dimensions			Protusion Above Gaging Diameter		Gaging Diameter
		Diameter		Height		Width		Depth		Dia	Depth	Width	Protusion Above Gaging Diameter
		Max	Min	Max	Min	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min
0	1/8	.112	.096	.025	.018	.023	.016	.011	.007	.062	.035	.014	–	–	–	0
1	1/8	.137	.120	.031	.023	.026	.019	.014	.009	.070	.043	.015	–	–	–	0
2	1/8	.162	.144	.036	.028	.031	.023	.016	.011	.088	.048	.017	.029	.017	.124	1
4	3/16	.212	.191	.047	.038	.039	.031	.022	.014	.110	.070	.018	.032	.019	.172	1
5	3/16	.237	.215	.053	.043	.043	.035	.024	.016	.122	.081	.018	.034	.020	.196	1
6	3/16	.262	.238	.059	.048	.048	.039	.027	.017	.140	.066	.025	.036	.021	.220	2
8	1/4	.312	.285	.070	.058	.054	.045	.032	.021	.168	.094	.029	.039	.023	.267	2
10	5/16	.362	.333	.081	.068	.060	.050	.037	.024	.182	.110	.030	.042	.025	.313	2
12	3/8	.412	.380	.092	.078	.067	.056	.043	.028	.226	.110	.030	.045	.027	.362	3
1/4	7/16	.477	.442	.107	.092	.075	.064	.050	.032	.244	.124	.032	.050	.029	.424	3
5/16	1/2	.597	.556	.134	.116	.084	.072	.062	.041	.310	.157	.053	.057	.034	.539	4
3/8	9/16	.717	.670	.161	.140	.094	.081	.075	.049	.358	.205	.061	.065	.039	.653	4
1/2	3/4	.815	.765	.156	.130	.106	.091	.072	.046	.402	.252	.068	.081	.049	.739	4

Head Dimensions for Torx® Drive Flat Head Machine Screws – Camcar

Nominal Size	G			T	B	F	Max Penetration of “No-Go” Gauge (Fallaway)	Torx® Driver Size
	Head Diameter			Head Height	Recess Diameter	Gauge Penetration
	Max Sharp	Min Sharp	Abs Min	Ref	Ref	Min
4	.225	.209	.195	.067	.094	.028	.019	T8
6	.279	.257	.244	.083	.111	.035	.022	T10
8	.332	.308	.292	.100	.132	.040	.026	T15
10	.385	.359	.340	.116	.155	.050	.031	T20
1/4	.507	.477	.452	.153	.200	.075	.040	T27
Torx° is a trademark of the Camcar Corporation, division of Textron Industries.

Head Dimensions for Square Socket Flat Head
Machine Screws – IFI

Nominal Size or Basic Screw Diameter		A		H		M		T		Driver Size
		Head Diameter		Recess Square		Recess Depth		Recess Penetration Gaging Depth
		Max	Min	Max	Min	Max	Min	Max	Min
4	.1120	.212	.191	.071	.0696	.073	.063	.038	.032	0
6	.1380	.262	.238	.091	.090	.113	.105	.065	.057	1
8	.1640	.312	.285	.1126	.111	.140	.119	.075	.065	2
10	.1900	.362	.333	.1126	.111	.140	.119	.075	.065	2
12	.2130	.412	.380	.133	.1315	.165	.155	.095	.085	3
1/4	.2500	.477	.442	.133	.1315	.165	.155	.095	.085	3
5/16	.3125	.597	.556	.191	.1895	.201	.191	.100	.090	4
This type of recess has a square opening, slightly tapered sides and a conical bottom.

Head Dimensions for Posidriv® Flat Head Machine Screws
ASME B18.6.3 – 1998

Nominal Size	A		H		M	R	N	Recess Penetration Gaging Depth		F		G	Driver Size
	Head Dimensions				Recess Dimensions					Protrusion Above Gaging Diameter		Gaging Diameter
	Diameter		Height		Dia	Depth	Width			Protrusion Above Gaging Diameter
	Max	Min	Max	Min	Ref	Ref	Ref	Max	Min	Max	Min
2	.162	.144	.051	.040	.096	.055	.029	.053	.037	.029	.017	.124	1
4	.212	.191	.067	.055	.122	.081	.030	.079	.063	.032	.019	.172	1
6	.262	.238	.083	.069	.168	.098	.041	.091	.073	.036	.021	.220	2
8	.312	.285	.100	.084	.182	.112	.041	.107	.089	.039	.023	.267	2
10	.362	.333	.116	.098	.198	.127	.041	.122	.104	.042	.025	.313	2
12	.412	.380	.132	.112	.262	.149	.056	.136	.118	.045	.027	.362	3
1/4	.477	.442	.153	.131	.276	.164	.057	.151	.133	.050	.029	.424	3
5/16	.597	.556	.191	.165	.358	.211	.086	.193	.175	.057	.034	.539	4
3/8	.717	.670	.230	.200	.368	.239	.086	.222	.204	.065	.039	.653	4
Posidriv® is a registered trademark of the Phillips Screw Company. Our fasteners with the “1A-drive” are not manufactured by or connected with the producers of Pozidrive® fasteners.

See also:
Slotted Flat Head Cap Screws
Machine Screw Drive Types
Machine Screw Head Styles

Head Dimensions for 82° Flat Head Machine ScrewsANSI B18.6.3 – 1998

Head Dimensions for 100° Flat Head Machine ScrewsANSI B18.6.3