Machine Screws

Mild Steel Machine Screws are available in CSK, Cheese, Raised CSK, Pan and Mushroom (Truss) heads in both Slotted and Phillips (Cross recessed) types.

These screws generally conform to property class 4.8 and are available in self colour and in zinc coated (blue passivation and yellow passivation) finishes. Screws with other finishes like zinc coating with trivalent finish, Nickle plating, Cadmium plating and Black phosphating are arranged against order.

Screws in property class 8.8 are also arranged against order.

SIZE RANGE and Specification

Slotted CSK head Machine Screws

1/8” x 1/4” to 1” x 6” in BSW threads to BS 450-1958.
M2 x 5mm to M24 x 150mm in metric threads to IS 1365-2005, DIN 963A and ISO 2009.
10BA x 1/4” to 0BA x 3” in BA threads.

Slotted Cheese head Machine Screws

1/8” x 1/4” to 3/8” x 6” in BSW threads to BS 450-1958.
M2 x 5mm to M12 x 150mm in metric threads to IS 1366-2002, DIN 84 and ISO 1207.
10BA x 1/4” to 0BA x 3” in BA threads

Slotted Round Head Machine Screws

1/8” x 1/4” to 3/8” x 2” in BSW threads to BS 450-1958.
M3 x 6mm to M6 x 50mm in metric threads

Slotted Raised CSK head Machine Screws

M3.5 x 12mm to M10 x 50mm to IS 8911- 2005 ISO 2010 : 1994

Slotted Mushroom (Truss) head Machine Screws

1/4” x 1/2” to 6”
M6 x 12mm to 100mm to IS 8822-1978

Pan Phillips (Cross Recessed) head Machine Screws

M2 x 4mm to M6 x 50mm to DIN 7985 and ISO 7045

CSK Phillips (Cross Recessed) head Machine Screws

M2 x 4mm to M6 x 50mm to DIN 965A and ISO 7046

Truss Phillips (Cross Recessed) head Machine Screws

M3 x 6mm to M6 x 50mm

IMPORTANT DIMENSIONS OF DIFFERENT TYPES OF SCREWS AS SPECIFIED IN THE RELEVANT SPECIFICATIONS

SLOTTED CSK HEAD MACHINE SCREWS TO IS 1365-2005 (DIN 963A) (ISO 2009 : 1994) WITH THREADS TO IS 14962 (PART2) 2002 (ISO 965-2 : 1998)

All dimensions are in mm

SIZE	M 2	M 2.5	M 3	M 3.5	M 4	M 5	M 6	M 8	M 10
Dia of head (d2) MIN MAX	3.50	4.40	5.20	6.94	8.04	8.94	10.87	15.37	17.78
Dia of head (d2) MIN MAX	3.80	4.70	5.50	7.30	8.40	9.30	11.30	15.80	18.30
DEPTH OF HEAD (k) MAX	1.20	1.50	1.65	2.35	2.70	2.70	3.30	4.65	5
Slot Depth (t) Min Max	0.40	0.50	0.60	0.90	1.00	1.10	1.20	1.80	2.00
Slot Depth (t) Min Max	0.60	0.75	0.85	1.20	1.30	1.40	1.60	2.30	2.60
Slot Width (n) Min Max	0.56	0.66	0.86	1.06	1.26	1.26	1.66	2.06	2.56
Slot Width (n) Min Max	0.70	0.80	1.00	1.20	1.51	1.51	1.91	2.31	2.81
Dia at thread (d1) Min Max	1.886	2.380	2.874	3.354	3.838	4.826	5.794	7.760	9.732
Dia at thread (d1) Min Max	1.981	2.480	2.980	3.479	3.978	4.976	5.974	7.972	9.968

SLOTTED CSK HEAD MACHINE SCREWS TO BS 450-1958

All dimensions are in Inches

SIZE (BSW)	1/8	5/32	3/16	1/4	5/16	3/8	1/2	5/8	3/4
Dia of head (d2) Min = 1.69D Max = 1.75D	0.201	0.254	0.307	0.412	0.518	0.624	0.835	1.046	1.257
Dia of head (d2) Min = 1.69D Max = 1.75D	0.219	0.273	0.328	0.438	0.547	0.656	0.875	1.094	1.312
DEPTH OF HEAD (k) MAX	0.056	0.070	0.084	0.113	0.141	0.169	0.225	0.281	0.338
Slot Depth (t) Nom	0.027	0.034	0.041	0.055	0.069	0.083	0.111	0.138	0.166
Slot Width (n) Min Max	0.032	0.036	0.042	0.051	0.061	0.072	0.092	0.113	0.134
Slot Width (n) Min Max	0.039	0.044	0.050	0.061	0.071	0.082	0.104	0.126	0.148
Dia at thread (d1)(min) Max	0.1179		0.1791	0.2408	0.3025	0.3643	0.4879	0.6119	0.7360
Dia at thread (d1)(min) Max	0.1238		0.1863	0.2488	0.3112	0.3736	0.4985	0.6233	0.7482

SLOTTED CHEESE HEAD MACHINE SCREWS TO IS 1366/2002 ISO 1207 : 1992 (DIN 84) WITH THREADS TO IS 14962 (PART2) 2002 (ISO 965-2 : 1998)

All dimensions are in mm

SIZE	M 2	M 2.5	M 3	M 4	M 5	M 6	M 8	M 10
Dia of head (d2) Min Max	3.62	4.32	5.32	6.78	8.28	9.78	12.73	15.73
Dia of head (d2) Min Max	3.80	4.50	5.50	7	8.50	10	13	16
Head depth (k) Min Max	1.26	1.66	1.86	2.46	3.12	3.60	4.70	5.70
Head depth (k) Min Max	1.40	1.80	2	2.60	3.30	3.90	5	6
Slot Depth (t)MIN	0.60	0.70	0.85	1.10	1.30	1.60	2	2.40
Slot Width (n) Min Max	0.56	0.66	0.86	1.26	1.26	1.66	2.06	2.56
Slot Width (n) Min Max	0.70	0.80	1	1.51	1.51	1.91	2.31	2.81
Dia at thread (d1) Min Max	1.886	2.380	2.874	3.838	4.826	5.794	7.76	9.732
Dia at thread (d1) Min Max	1.981	2.480	2.980	3.978	4.976	5.974	7.972	9.968

SLOTTED CHEESE HEAD MACHINE SCREWS TO BS 450-1958

All dimensions are in Inches

SIZE (BSW)	1/8	5/32	3/16	1/4	5/16	3/8	1/2	5/8	3/4
Dia of head (d2) Min Max	0.180	0.225	0.281	0.360	0.450	0.540	0.720	0.900	1.080
Dia of head (d2) Min Max	0.188	0.234	0.270	0.375	0.469	0.562	0.750	0.938	1.125
Head depth (k) Min Max	0.082	0.103	0.124	0.165	0.207	0.249	0.333	0.417	0.500
Head depth (k) Min Max	0.087	0.109	0.131	0.175	0.219	0.262	0.350	0.437	0.525
Slot Depth (t) Nom (Inches)	0.039	0.049	0.059	0.079	0.098	0.118	0.157	0.197	0.236
Slot Width (n) Min Max	0.032	0.036	0.042	0.051	0.061	0.072	0.092	0.113	0.134
Slot Width (n) Min Max	0.039	0.044	0.050	0.061	0.071	0.082	0.104	0.126	0.148
Dia at thread (d1) Min Max	0.1179		0.1791	0.2408	0.3025	0.3643	0.4879	0.6119	0.7360
Dia at thread (d1) Min Max	0.1238		0.1863	0.2488	0.3112	0.3736	0.4985	0.6233	0.7482

SLOTTED RAISED CSK HEAD MACHINE SCREWS TO IS 8911 - 2005 ISO 2010 : 1994 WITH THREADS TO IS 14962 (PART2) 2002 (ISO 965-2 : 1998)

All dimensions are in mm

SIZE	M 2	M 2.5	M 3	M 3.5	M 4	M 5	M 6	M 8	M 10
Dia of head (d2) Min Max	3.50	4.40	5.20	6.94	8.40	8.94	10.87	15.37	18.30
Dia of head (d2) Min Max	3.80	4.70	5.50	7.30	8.04	9.30	11.30	15.8	20
DEPTH OF HEAD (k) MAX	1.20	1.50	1.65	2.35	2.70	2.70	3.30	4.65	5
Slot Depth (t) Min Max	0.80	1	1.20	1.40	1.60	2	2.40	3.20	3.80
Slot Depth (t) Min Max	1	1.20	1.45	1.70	1.90	2.40	2.80	3.70	4.40
Slot Width (n) Min Max	0.56	0.66	0.86	1.06	1.26	1.26	1.66	2.06	2.56
Slot Width (n) Min Max	0.70	0.80	1.00	1.20	1.51	1.51	1.91	2.31	2.81
Dia at thread (d1) Min Max	1.886	2.380	2.874	3.354	3.838	4.826	5.794	7.760	9.732
Dia at thread (d1) Min Max	1.981	2.480	2.980	3.479	3.978	4.976	5.974	7.972	9.968

SLOTTED MUSHROOM HEAD MACHINE SCREWS TO IS 8822-1978

All dimensions are in mm

SIZE	M 6	M 8	M 10
Dia of head (d2) Min Max	12.45	15.45	19.35
Dia of head (d2) Min Max	13.55	16.55	20.65
DEPTH OF HEAD (k) Nom	4	5	6
Slot Depth (t) Min Max	1.6	2	2.4
Slot Depth (t) Min Max	2.1	2.6	3
Slot Width (n) Min Max	1.6	1.6	2.5
Slot Width (n) Min Max	1.8	1.8	2.8
Dia at thread (d1) Min Max	5.694	7.637	9.593
Dia at thread (d1) Min Max	5.974	7.972	9.968

CSK PHILLIPS (CROSS RECESSED) HEAD MACHINE SCREWS TO IS7485 (part 1)/2005 ISO 7046-1 : 1994 (DIN 965A)

All dimensions are in mm

Size	M2	M2.5	M3	M3.5	M4	M5	M6	M8	M10
Head Dia d2 nom = max	3.80	4.70	5.50	7.30	8.40	9.30	11.30	15.90	18.30
d2 min	3.50	4.40	5.20	6.94	8.04	8.94	10.87	15.37	17.78
Depth of Head k Max	1.20	1.50	1.65	2.35	2.70	2.70	3.30	4.65	5
Recess No	0	1	1	2	2	2	3	4	4

PAN PHILLIPS (CROSS RECESSED) HEAD MACHINE SCREWS TO IS 7483/2005 ISO 7045 : 1994 (DIN 7985)

All dimensions are in mm

Size	M2	M2.5	M3	M3.5	M4	M5	M6	M8	M10
Head Dia d2 nom = max	4	5	5.60	7	8	9.50	12	16	20
d2 Min	3.70	4.70	5.30	6.64	7.64	9.14	11.57	15.57	19.48
Depth of Head k nom = max	1.60	2.10	2.40	2.60	3.10	3.70	4.60	6	7.50
k min	1.46	1.96	2.26	2.46	2.92	3.52	4.30	5.70	7.14
Recess No	0	1	1	2	2	2	3	4	4

ROUND HEAD SCREWS TO BS 450-1958

All dimensions are in Inches

SIZE (BSW)	1/8	5/32	3/16	1/4	5/16	3/8	1/2	5/8	3/4
Dia of head (d2) Min Max	0.201	0.259	0.312	0.417	0.524	0.629	0.840	1.051	1.262
Dia of head (d2) Min Max	0.219	0.273	0.328	0.438	0.547	0.656	0.875	1.094	1.312
Head depth (k) Min Max	0.082	0.103	0.124	0.165	0.207	0.249	0.333	0.417	0.500
Head depth (k) Min Max	0.087	0.109	0.131	0.175	0.219	0.262	0.350	0.437	0.525
Slot Depth (t) Nom	0.048	0.060	0.072	0.096	0.120	0.144	0.192	0.240	0.288
Slot Width (n) Min Max	0.032	0.036	0.042	0.051	0.061	0.072	0.092	0.113	0.134
Slot Width (n) Min Max	0.039	0.044	0.050	0.061	0.071	0.082	0.104	0.126	0.148
Dia at thread (d1) Min Max	0.1179		0.1791	0.2408	0.3025	0.3643	0.4879	0.6119	0.7360
Dia at thread (d1) Min Max	0.1238		0.1863	0.2488	0.3112	0.3736	0.4985	0.6233	0.7482

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