MODUK DEF STAN 02-862: PART 4 PDF

This Defence Standard specifies the requirements for the manufacture, testing, identification and packaging, and quality assurance documentation for metric and unified threaded steel bolts, screws, studs, studbolts and nuts (including prevailing-torque type nuts for SM1-M and SM1-U grades only) for Submarine First Level Quality Assured applications as defined in SSP 25.

The following three grades of metric fastener and three grades of unified fastener are specified:

a) Submarine Grade 1 – Metric (abbreviated to SM1-M) for zinc-plated fasteners from 6 mm to 48 mm thread diameter for use where the temperature will be less than 60°C.

b) Submarine Grade 2 – Metric (abbreviated to SM2-M) for unplated fasteners from 6 mm to 48 mm thread diameter for use where the temperature will be less than 300°C.

c) Submarine Grade 3 – Metric (abbreviated to SM3-M) for unplated fasteners from 6 mm to 48 mm thread diameter for use where the temperature will range between 0°-520°C.

d) Submarine Grade 1 – Unified (abbreviated to SM1-U) for zinc-plated fasteners from 1/4 inch to 2 inch thread diameter for use where the temperature will be less than 60°C.

e) Submarine Grade 2 – Unified (abbreviated to SM2-U) for unplated fasteners from 1/4 inch to 2 inch thread diameter for use where the temperature will be less than 300°C.

f) Submarine Grade 3 – Unified (abbreviated to SM3-U) for unplated fasteners from 1/4 inch to 2 inch thread diameter for use where the temperature will range between 0°-520°C.

The requirements of this Defence Standard may also be applied to other ferrous threaded components intended for use in Submarine First Level Quality Assured applications.