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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN ISO 1580, BSI BS EN ISO 7045
Specification for machine screws and machine screw nuts. Metric series
1.1 The provisions of this British Standard are applicable to machine screws and machine screw nuts having ISO metric threads.
1.2 Dimensions and tolerances are given for machine screws in the following ranges:
Table 1 — Machine screws. Metric series
| Machine screw type | Head style | Diameter range |
|---|---|---|
| Slotted head screws | Countersunk head, Raised countersunk head, Cheese head | M1 (1 mm) to M20 (20 mm) |
| Pan head | M2.5 (2.5 mm) to M10 (10 mm) | |
| Recessed head screws | Countersunk head, Raised countersunk head | M2.5 (2.5 mm) to M12 (12 mm) |
| Pan head | M2.5 (2.5 mm) to M10 (10 mm) |
1.3 Dimensions and tolerances are also given for square and hexagon machine screw nuts, pressed type, within the diameter range M1.6 (1.6 mm) to M10 (10 mm).
NOTE Details of precision hexagon nuts are given in BS 3692, “ISO metric precision hexagon bolts, screws and nuts”.
1.4 Mechanical properties are specified for steel, brass and aluminium alloy machine screws and machine screw nuts.
1.5 Appendices are included relating to:
With ISO metric screw threads to BS 3643, 1 mm to 20 mm diameter.
Dimensions, tolerances, mechanical requirements for countersunk, raised countersunk, pan and cheese head screws with slotted heads, and countersunk, raised countersunk and pan head screws with recessed heads.
Dimensions, tolerances, general requirements for square and hexagon machine screw nuts (pressed type).
Checking recess penetration, dimensioning of 90° countersunk heads, standard sizes.
See BS 1981, BS 3692.
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