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M110
M110A2

8" Self-propelled Howitzer M1101-9

M110: General
Date of first acceptance 1962
Manufacturers
  • Pacific Car and Foundry Co.
  • FMC Corp.
  • Bowen-McLaughlin-York
Crew
13 men:
  • Gunner on gun mount left
  • Gunner on gun mount right
  • Two loaders on gun mount right
  • Driver in hull left front
  • 8 in support vehicle
M110: Dimensions
Combat weight 58,500lbs
26,500kg		 Height with howitzer in travel position 115.6"
293.6cm
Length without howitzer 254.3"
645.9cm		 Howitzer overhang forward 40.1"
102cm
Width 124.0"
315.0cm		 Tread 106.0"
269.2cm
Ground clearance 17.4"
44.2cm		 Fire height ~80"
~200cm
Ground pressure, zero penetration 11.0psi
.772kg/cm²
M110: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation Max elevation rate
8" Howitzer M2A2 M158 at rear of vehicle 2 rounds 60°
(30° left and right;
manual and hydraulic)		 8°/sec +65° to -2°
(manual and hydraulic)		 6°/sec
Aiming equipment
Panoramic telescope M115 for left gunner and elbow telescope M116 for right gunner
M110: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Front .5"
1.3cm		 0°
Driver's compartment sides and rear .5"
1.3cm		 0°
Driver's compartment top .5"
1.3cm		 90°
M110: Automotive
Engine General Motors 8V71T Model 7083-7398; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2,300rpm
Gross: 405@2,300rpm		 Torque Net: 895 ft-lb@1,600rpm
Gross: 980 ft-lb@1,700rpm		 Fuel capacity 300gal
1,100L
Transmission Allison XTG-411-2A, 4 ranges forward, 2 reverse
Steering Mechanical, steering bar (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M110: Suspension
Type Road wheels Track return rollers
Torsion bar 5 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
11-tooth front drive Rear road wheels serve as adjustable trailing idlers All road wheels fitted with hydraulic lock-out cylinders which serve as shock absorbers when vehicle is moving
M110: Track
T132
Center guide, single pin, steel with detachable rubber pad
Width 18"
46cm		 Pitch 6"
15cm		 Shoes/track Left side: 75
Right side: 76		 Ground contact length 148"
376cm
M110: Performance
Max level road speed 34mph
55kph		 Max trench 84"
210cm
Max grade 60% Angle of approach 58°
Angle of departure 42° Max vertical obstacle 40"
100cm
Min turning diameter 24'
7.3m		 Max fording depth 42"
110cm
Cruising range ~450mi, roads
~720km, roads

The M110 used the same hull, loading and ramming mechanisms, and weapon mount as the 175mm self-propelled gun M107. In 1977, the first M110A1s entered service; these were armed with the longer 8" howitzer M201. The M201 allowed greater range over the shorter M2A2 howitzer.

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8" Self-propelled Howitzer M110A21,6-10

M110A2: General
Date of first acceptance 1978
Manufacturers
  • Pacific Car and Foundry Co.
  • FMC Corp.
  • Bowen-McLaughlin-York
Crew
13 men:
  • Gunner on gun mount left
  • Gunner on gun mount right
  • Two loaders on gun mount right
  • Driver in hull left front
  • 8 in support vehicle
M110A2: Dimensions
Combat weight 62,500lbs
28,400kg		 Height with howitzer in travel position 123.8"
314.5cm
Length without howitzer 254.3"
645.9cm		 Howitzer overhang forward 168.2"
427.2cm
Width 124.0"
315.0cm		 Tread 106.0"
269.2cm
Ground clearance 17.4"
44.2cm		 Fire height ~80"
~200cm
Ground pressure, zero penetration 11.7psi
.821kg/cm²
M110A2: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation Max elevation rate
8" Howitzer M201A1 M158 at rear of vehicle 2 rounds 60°
(30° left and right;
manual and hydraulic)		 8°/sec +65° to -2°
(manual and hydraulic)		 6°/sec
Aiming equipment
Panoramic telescope M115 for left gunner and elbow telescope M116 for right gunner
M110A2: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Front .5"
1.3cm		 0°
Driver's compartment sides and rear .5"
1.3cm		 0°
Driver's compartment top .5"
1.3cm		 90°
M110A2: Automotive
Engine General Motors 8V71T Model 7083-7398; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2,300rpm
Gross: 405@2,300rpm		 Torque Net: 895 ft-lb@1,600rpm
Gross: 980 ft-lb@1,700rpm		 Fuel capacity 260gal
980L
Transmission Allison XTG-411-2A, 4 ranges forward, 2 reverse
Steering Mechanical, steering bar (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M110A2: Suspension
Type Road wheels Track return rollers
Torsion bar 5 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
11-tooth front drive Rear road wheels serve as adjustable trailing idlers All road wheels fitted with hydraulic lock-out cylinders which serve as shock absorbers when vehicle is moving
M110A2: Track
T132
Center guide, single pin, steel with detachable rubber pad
Width 18"
46cm		 Pitch 6"
15cm		 Shoes/track Left side: 75
Right side: 76		 Ground contact length 148"
376cm
M110A2: Performance
Max level road speed 34mph
55kph		 Max trench 72"
180cm
Max grade 60% Max vertical obstacle 40"
100cm
Min turning diameter 24'
7.3m		 Max fording depth 42"
110cm
Cruising range ~325mi, roads
~523km, roads

The M110A2 was an M110A1 equipped with a double-baffle muzzle brake. The M110A1s had been limited to zone 8 of the M188A1 propelling charge, but the muzzle brake alleviated excessive recoil forces and allowed the howitzer to fire zone 9, which permitted greater range. When fitted with the muzzle brake, the howitzer M201 was redesignated M201A1.

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References

  1. Hunnicutt, R.P. Sheridan: A History of the American Light Tank, volume 2. Navato, CA: Presidio Press, 1995. Reprinted with permission from Sheridan, R.P. Hunnicutt ©1995, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  2. TM 9-2300-216-10 Operator's Manual for Gun, Field Artillery, Self-propelled: Full Tracked, 175-mm, M107 (T235E1) (2350-436-6635) and Howitzer, Heavy, Self-propelled: Full Tracked, 8-inch, M110 (T236E1) (2350-439-6243). Washington, DC: Headquarters, Department of the Army, 28 June 1962.
  3. TM 9-2300-216-10 C5 Operator's Manual for Gun, Field Artillery, Self-propelled: 175-mm, M107 (2350-436-6635) and Howitzer, Heavy, Self-propelled: 8-inch, M110 (2350-439-6243). Washington, DC: Headquarters, Department of the Army, 16 October 1968.
  4. TM 9-2300-216-20P C2 Organizational Maintenance Repair Parts and Special Tools list for Gun, Field Artillery, Self-propelled: 175-mm, M107 (2350-436-6635) and Howitzer, Heavy, Self-propelled: 8-inch, M110 (2350-439-6243). Washington, DC: Headquarters, Department of the Army, 17 March 1970.
  5. TM 9-1240-288-35P Direct Support, General Support, and Depot Maintenance Repair Parts and Special Tools List Telescope, Elbow M116A1D (1240-759-7781), M116 (1240-898-6787), M116C (1240-898-6789), and M116F (1240-974-3462). Washington, DC: Headquarters, Department of the Army, 24 September 1970.
  6. TM 9-2815-202-34 C1 Direct and General Support Maintenance Manual Engine, Diesel W/Container: Model 7083-7391 (2815-01-335-4579) Engine, Diesel W/Container: Model 7083-7395 (2815-01-043-7092 (2815-01-260-0211) Engine, Diesel W/Container: Model 7083-7396 (2815-01-040-3120) (2815-01-260-0212) Engine, Diesel W/Container: Model 7083-7398 (2815-00-936-7659) Engine, Diesel W/Container: Model 7083-7399 (2815-00-134-4845). Washington, DC: Headquarters, Department of the Army, 9 October 1992.
  7. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  8. Hogg, Ian V. The Greenhill Armoured Fighting Vehicles Data Book. London: Greenhill Books, 2000.
  9. Strobridge, Truman R., and Bernard C. Nalty. "The Roar of the 8-Incher." Field Artillery Journal Mar-Apr 1980: 30-6.
  10. Federation of American Scientists. "M110A2 Self-Propelled Howitzer." DOD 101. 12 Sep 1998. 17 Apr 2001 <http://www.fas.org/man/dod-101/sys/land/m110a2.htm>. DOD 101
Last updated 8 Feb 2024.
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© Copyright 2001-24 Chris Conners