The MSME registration asks for the business activity by NIC code. For repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines, that activity is 33121.
NIC code · National Industrial Classification 2008
33121 is the 5-digit NIC 2008 code for repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines: a sub-class of class 3312, repair of machinery, within division 33, repair and installation of machinery and equipment. Search a code or activity below, or copy the code for your Udyam or SPICe+ form.
This code
Division 33Group 331Class 3312Sub-class 33121
Repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines
Sub-class 33121 · Class 3312 · Group 331 · Division 33 · 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.
331215 digits: 33 + 1 + 2 + 1NIC 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 33121. 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 33 covers repair and installation of machinery and equipment. It sits in section C, manufacturing.
Repair of fabricated metal products, machinery and equipment.
Repair of machinery. The official note for this class is quoted below.
Repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines. The full 5-digit code you enter where a form asks for the business activity by NIC code.
What it covers
33121 is a sub-class of class 3312, repair of machinery. The NIC 2008 document explains the class in the note below, quoted exactly.
This class includes repair and maintenance of industrial machinery and equipment like sharpening or installing commercial and industrial machinery blades and saws or the provision of welding (e.g. automotive, general) repair services; the repair of agricultural and other heavy and industrial machinery and equipment (e.g. forklifts and other materials handling equipment, machine tools, commercial refrigeration equipment, construction equipment, and mining machinery), comprising machinery and equipment of division
This class excludes:
- - installation of furnaces and other heating equipment, see 4322
Where you use it
Two registration forms ask for the business activity by NIC code. This is where 33121 is entered.
The MSME registration asks for the business activity by NIC code. For repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines, that activity is 33121.
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
33121 is for repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines. The codes below sit closest to it in NIC 2008: the other sub-classes of class 3312. Each has its own page with the official wording.
33122Class 3312 · another sub-class of the same class33123Class 3312 · another sub-class of the same class33124Class 3312 · another sub-class of the same class33125Class 3312 · another sub-class of the same class33126Class 3312 · another sub-class of the same classClass 3312 has 8 sub-classes in NIC 2008, including 33121. 5 of the others are shown here.
Questions
Repair and maintenance of engines and turbines excluding aircraft, vehicle and cycle engines, in the National Industrial Classification 2008. It is a sub-class of class 3312, repair of machinery.
Class 3312, repair of machinery, has 8 sub-classes in NIC 2008. Besides 33121, those with a page here are: 33122 (Repair and maintenance of pumps and related equipment, fluid power equipment, valves); 33123 (Repair and maintenance of metal cutting and metal forming machine tools and accessories, power-driven hand-tools and other machine tools); 33124 (Repair and maintenance of agricultural machinery and forestry and logging machinery including agricultural tractors); 33125 (Repair and maintenance of mining, construction, and oil and gas field machinery; metallurgy machinery); 33126 (Repair and maintenance of food, beverage, and tobacco processing machinery).
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 3312, 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.