Equipment 81 mm Mortar
A lightweight weapon, which can be easily deployed. The base plate is star shaped with rotating socket in the centre and three sets of ribs and spades which provide all round traverse without movement of the plate and ensures equipment stability in all types of ground conditions. The special steel mount is provided with buffer assembly, cross leveling device and elevating and traversing gears.
PERFORMANCE :
a) Maximum Muzzle Velocity 295 M/sec.
b) Rate of Fire :
i) With relaying the Mortar for every round 6 to 8 rds/minute
ii) Without relaying the Mortar for every round 20 rds/minute (max)
c) Range
Charge Max. Range Charge Max. Range
0 0550 M 5 3725 M
1 1275 M 6 4175 M
2 1980 M 7 4625 M
3 2640 M 8 5000 M
4 3200 M    
6000 M with improved version
d) Life :
i) Max No. of EFC's which may be fired between Examination

2000

ii) Condemnation limit Bore Dia 81.91 mm
e) Maximum Service Pressure 600 Kg/Sq.cm.
Copper (3.80 tsi)
PHYSICAL CHARACTERISTICS :
a) Weights :
i) Total Wt. of the Equipment with sight and Accessories including Boxes transit for Barrel and Base Plate 135 Kgs
ii) Total Wt. of the Equipment without sight and accessories 40.6 Kgs (89.55lbs)
iii) Total Wt. of the Barrel (with Breech Block) 14.5 Kgs (32 lbs)
iv) Total Wt. of the Mount 11.7 Kgs (25.8 lbs)
v) Total Wt. of the Base Plate 14.4 Kgs (31.75 lbs)
vi) Total Wt. of the sight heavy Mortar Cased IC 4.7 Kgs
vii) Total Wt. of the sight without the case 2.5 Kgs
b) Length of the Barrel with Breech Block 1550 mm (61 in)
c) Calibre of Barrel H.81.44 mm/ L 81.40 mm
d) Elevation limits 30 d to 85 d (or 533 mils to 1511 mils)
e) Traverse (right or left)  
i) By moving the Bipod 360 degree
ii) Without moving the Bipod 7 ° 30' to 18 ° 30'
Position of Clamping Collar
  Angle of Elevation
  45 ° 60 ° 75 °
Top 7 ° 30' 9 ° 16 °
Middle 10 ° 11 ° 30' 16 ° 30'
Bottom 12 ° 14 ° 15' 18 ° 30'
b) Height :
i) For loading in unprepared position of Base plate at 45° Elevation – 47"
at 85° Elevation – 66"
ii) For loading in prepared position of Base Plate at 45 ° Elevation - 40"
g) Striker Protrusion L 1.5. mm
H 1.8 mm
h) Recoil Absorbing arrangement by Shock absorbers
(i.e. the mechanical spring type with two guide Rods / tubes forms an elastic link between the Barrel and the bipod)
i) Detachment 3 men
Contact :
Marketing & Export Division
Ordnance Factory Board
Ayudh Bhawan
Government of India
Ministry of Defence
10A, S. K. Bose Road, Kolkata – 700 001, India.

Tel: 0091-33-2248 9027 / 2248 2103 / 2248 5077-80
Fax : 0091-33-2248 1748/2210 8235
Mail : ofbtrade@dataone.in
http:// www.ofb.gov.in