Equipment 120 mm Mortar
A very effective light artillery weapon which fires HE, smoke and illuminating ammunition. Capable of being carried manually over short distances and transported by animal pack, towed behind a jeep and para-dropped. Provided with a base plate consisting of upper plate having a rotating socket and two housings for the clamping collar pivot axis. The lower part has three sets of ribs and spades which provide stability to the plate.
PERFORMANCE :
(a) Maximum Muzzle Velocity :
i) With HE M-44 Bomb 331 M/S
ii) With PEPA LP Bomb 305 M/S
(b) Rate of fire :
i) By gravity firing
(a) With relaying the Mortar for every round 5 to 6 rds/minute
(b) Without relaying the Mortar for every round 8 to 10 rds/minute
ii) By lanyard firing
(a) With relaying the Mortar for every round 3 to 4 rds/minute
(b) Without relaying the Mortar for every round 5 to 6 rds/minute
(c) Range
  PEPA LP
Charge HE M-44 Assistance Without Rocket Assistance With Rocket
0 1360 m - -
1 2200 m - -
2 3050 m 2530 m -
3 3850 m 3425 m 6150 m
4 4750 m 4175 m 7180 m
5 5550 m 4800 m 7800 m
6 6150 m 5370 m 8450 m
7 6650 m 5900m * 8950 m
*10000 with improved version
(d) Life 5000 rds (Provisional)
(e) Maximum Service Pressure HE-M 44 Bomb 820 Kg / Sq.cm
PEPA LP Bomb 850 kg / Sq.cm
(f) Maximum Towing Speed 50 Km/hr
PHYSICAL :
 
(a) Weights :
i) Total Wt. of the Equipment with sight and accessories 421 Kgs
ii) Total Wt. of the Equipment without Sight and accessories 402 Kgs
iii) Total Wt. of the Barrel (With Breech Piece) 68 Kgs
iv) Total Wt. of the Mount 86 Kgs
v) Total Wt. of the Base Plate 80 Kgs
(vi) Total Wt. of the Carriage with Wheels 137 Kgs
vii) Total Wt. of the Carriage Without Wheels 93 Kgs
viii) Total Wt. of the Wheels 44 Kgs
ix) Total Wt. of the Towing Ring 8 Kgs
x) Total Wt. of the Base Plate Clamping collar 6 Kgs
xi) Total Wt. of the Travelling Shield 17 Kgs
xii) Total Wt. of the Army sight (APX-L-811) with Case 3 Kgs
xiii) Total Wt. of the Army sight (APX-L-811) Without Case 1.7 Kgs
xiv) Total Wt. of the IA Heavy Mortar Sight Cased (IMR3OGA) 4.7 Kgs
xv) Total Wt. of the IA Heavy Mortar Sight without Case 2.5 Kgs
xvi) Total Wt. of the Accessories 16 Kgs
b) Length :
i) Length of Barrel with Breech Piece 1750 mm
ii) Total Length of Equipment in TOW 2565 mm
c) Calibre of Barrel 120.15 mm
d) Elevation:
i) Elevation Limits 45 o to 85 o
ii) Elevation per turn of Hand Wheel 18 min.20 sec.
e) Maximum width of Equipment 1585 mm
f) Ground Clearance in Tow 260 mm
g) Height :
i) In Tow 1195 mm
ii) For loading in unprepared position of base Plate  
  At 45 degree Elevation 1460 mm
  At 80 degree Elevation 1945 mm
iii) For loading in prepared position of Base Plate  
  At 45 degree Elevation 1145 mm
  At 80 degree Elevation 1675 mm
h) Striker Protrusion 1.9 mm Min.
Max. 2.5 mm
i) Recoil Absorbing arrangement Shock Absorber
j) Traverse:
1) Distance between top face of Breech And Upper Collar Shock absorber. Elevation (approx) Top traverse (approx) Traverse per Turn of Hand Wheel (approx)
200 mm 55 d 10'(min) 22 d 55' 22'
  85 d (max) 31 d 40' 30'
400 mm 46 d 35'(min) 18 d 30 ' 18'
  74 d 10'(max) 24 d 20' 25'
500 mm 42 d 05'(min) 16 d 45' 17'
  68 d 10'(max) 22 d 12 ' 22'
2) With moving bipod 360 degree
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