The MSME registration asks for the business activity by NIC code. For manufacture of nuclear reactors, except isotope separators, that activity is 25132.
NIC code · National Industrial Classification 2008
25132 is the 5-digit NIC 2008 code for manufacture of nuclear reactors, except isotope separators: a sub-class of class 2513, manufacture of steam generators, except central heating hot water boilers, within division 25, manufacture of fabricated metal products, except machinery and equipment. Search a code or activity below, or copy the code for your Udyam or SPICe+ form.
This code
Division 25Group 251Class 2513Sub-class 25132
Manufacture of nuclear reactors, except isotope separators
Sub-class 25132 · Class 2513 · Group 251 · Division 25 · Section C, NIC 2008
The code
Where the code sits in the National Industrial Classification 2008, from section to sub-class, in the official wording.
251325 digits: 25 + 1 + 3 + 2NIC 2025 · Notice dated 16 October 2026
On 18 November 2025 the Ministry of Statistics and Programme Implementation released NIC 2025, which uses 6-digit codes aligned with the UN's ISIC Revision 5. This page shows the NIC 2008 code 25132. The matching NIC 2025 code will be added here once it is mapped from MoSPI's official concordance.
How to read it
An NIC code is built in layers. Each digit narrows the one before it: the division, the group, the class, and finally the 5-digit sub-class. Divisions themselves are grouped under lettered sections.
The broadest numbered layer. Division 25 covers manufacture of fabricated metal products, except machinery and equipment. It sits in section C, manufacturing.
Manufacture of structural metal products, tanks, reservoirs and steam generators.
Manufacture of steam generators, except central heating hot water boilers. The official note for this class is quoted below.
Manufacture of nuclear reactors, except isotope separators. The full 5-digit code you enter where a form asks for the business activity by NIC code.
What it covers
25132 is a sub-class of class 2513, manufacture of steam generators, except central heating hot water boilers. The NIC 2008 document explains the class in the note below, quoted exactly.
This class excludes:
- - manufacture of central heating hot-water boilers and radiators, see 2512
- - manufacture of boiler-turbine sets, see 2811
- - manufacture of isotope separators, see 2829
Where you use it
Two registration forms ask for the business activity by NIC code. This is where 25132 is entered.
The MSME registration asks for the business activity by NIC code. For manufacture of nuclear reactors, except isotope separators, that activity is 25132.
The company incorporation form asks for the main industrial activity of the proposed company by NIC code.
Not GST. GST registration does not use NIC codes; goods and services there are classified by HSN and SAC codes.
Choosing the right code
25132 is for manufacture of nuclear reactors, except isotope separators. The codes below sit closest to it in NIC 2008: the other sub-classes of class 2513 and other classes in group 251. Each has its own page with the official wording.
Class 2513 has 4 sub-classes in NIC 2008, including 25132. 1 of the others are shown here.
These belong to other classes in group 251, manufacture of structural metal products, tanks, reservoirs and steam generators. 25132 itself is in class 2513. Use the search above for any other code on this page.
Questions
Manufacture of nuclear reactors, except isotope separators, in the National Industrial Classification 2008. It is a sub-class of class 2513, manufacture of steam generators, except central heating hot water boilers.
Class 2513, manufacture of steam generators, except central heating hot water boilers, has 4 sub-classes in NIC 2008. Besides 25132, those with a page here are: 25131 (Manufacture of steam or other vapour generating boilers and hot water boilers other than central heating boilers).
In Udyam Registration, which asks for the business activity by NIC code, and in the SPICe+ company incorporation form, which asks for the main industrial activity by NIC code. GST registration does not use NIC codes.
About this page
The section, division, group, class and sub-class on this page, and the explanatory note for class 2513, are taken word for word from the official document “National Industrial Classification (All Economic Activities) 2008”, Central Statistical Organisation, Ministry of Statistics and Programme Implementation, Government of India.
This is reference information on the classification of a business activity. It is not advice on which code your own business should declare, and the official NIC document prevails if the two ever differ. A change in the classification, including the MoSPI concordance to NIC 2025, re-opens this page for checking.
Not sure which code fits your activity, or spotted a mismatch? Use the WhatsApp button on this page and tell us what the business sells and how.