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Mont Blanc T Slot Screws
T Slot Screws

Screw slot fixture. Brownells (in stock) 4.3 (4) 60° dovetail standard slot sight base files. Brownells (in stock) - 4.5 (2) 65° 1911 dovetail type slot sight base files. Brownells (in stock) - 4.6 (8) screw head files. Dick gmbh (in stock) - 0.0. Slotted head triggerguard screws. These are also commonly referred to as Micro Screws, Camera Screws, and Eyeglass Screws NBK offers a broad line of miniature, precision screws designed by years of extensive R&D. The size range for these screws are S0.6 to M2.6; with options to choose for steel, stainless steel and plastic.

msflathead

Mont Blanc T Slot Screws

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.

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

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.

T Slot Screws

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

Mont Blanc T Slot Screws

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

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

Head Dimensions for Undercut Flat Head Machine ScrewsANSI B18.6.3