IS 18508:2024
Machine screws of iron or steel (coach screws, hexagon and cross-recessed types)
BIS QCO · ISI MARK · 7 LINES · STEEL AND STEEL PRODUCTS (QUALITY CONTROL) ORDER — FASTENERS NOTIFICATION, NOTIFIED VIDE S.O. 2771(E) AND S.O. 3927(E)
IS 18508 specifies the requirements for set screws, grub screws and headless threaded fasteners used in shaft-collar, pulley, gear and machine-element retention. The standard governs point type (cone, cup, flat, dog), drive form, hardness, thread tolerance and locking performance.
At a glance
7
Tariff lines covered (8-digit HSN)
Chapter 73
Primary HSN chapter
ISI
Mark scheme
Steel and Steel Products (Quality Control) Order — fasteners notification, notified vide S.O. 2771(E) and S.O. 3927(E)
Governing Quality Control Order
Tariff lines covered
Heading 7318
7318 11 10Machine screws of iron or steel (coach screws, hexagon and cross-recessed types)7318 11 90Coach screws of iron or steel (lag screws, timber screws)7318 12 00Iron or steel wood screws of all head and drive types7318 13 00Screw hooks and screw rings of iron or steel7318 14 00Self-tapping screws of iron or steel7318 15 00Iron or steel screws and bolts with nuts or washers7318 19 00Other threaded fasteners of iron or steel (screws, bolts, nuts, screw hooks)
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Speak to an Expert Last verified against gazette notifications: 2026-05-16. Source: BIS / Indian Customs CUSDATA.
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