|Total acceptances||~1,410 M113A1 and M113A2||Crew||4 men|
|Combat weight with TOW CAP||25,023lbs
|Height with TOW CAP raised||128"
|Gun overhang forward||0"|
|Width over track shrouds||105.75"
|Ground pressure, zero penetration||7.9psi
|TOW missile launcher||M233||10 TOW missiles||Manual||Manual|
|.50cal M2HB MG||Flexible on cupola mount||2000 rounds||360°
|Infrared periscope M19 for driver, TOW sight assembly|
|Rolled 5083/5086 H32 aluminum armor|
|Location||Thickness||Angle from vertical|
|Engine||General Motors 6V53; 6 cylinder, 2 cycle, vee diesel|
|Horsepower||Gross: 212@2800rpm||Torque||Gross: 492 ft-lb@1300rpm||Fuel capacity||95gal
|Transmission||Allison TX-100, 3 ranges forward, 1 reverse|
|Steering||DS200 controlled differential, steering levers|
|Type||Road wheels||Track return rollers|
|Torsion bar||5 individually sprung dual/track||Flat track|
|Drive sprockets||Idlers||Shock absorbers||10-tooth front drive||Dual adjustable at rear of track||On first and last road wheels/track|
|Center guide, single pin, steel with detachable rubber pad|
|Shoes/track||Left side: 63
Right side: 64
|Ground contact length||105"
|Max level road speed||42mph
|Max grade||60%||Max vertical obstacle||24"
|Min turning diameter||26'
|Max fording depth||Floats|
|Cruising range||~300mi, roads
During development of the TOW missile, the ability to mount the system in the M113 was a requirement. The M233 kit, standardized on 20 August 1971, provided a retractable pedestal for mounting the launcher for the TOW in the M113A1 and M113A2. The pedestal raised both the launcher and gunner up through the cargo hatch in the vehicle roof within ten seconds, and the launcher could also be displaced from the vehicle and used on the ground; the launcher's tripod was stowed on the vehicle. Between fiscal years 1969 and 1976, 2,148 M233 kits were procured.
Due to the exposed nature of the firing position, a rainbow-shaped tent was developed to provide some protection to the gunner from artillery fire. Called TOW CAP (TOW Cover, Artillery Protection), the cover was open to the front and rear and affected the traverse of the launcher. The TOW CAP was structured with a tubular steel frame, and for the protection used the 48-ply ballistic nylon fabric found in the infantry's body armor. Four sections were attached together and raised over the frame to form the roof, while a front panel was installed below the TOW launcher. The TOW CAP was 56" (140cm) tall, 67.25" (170.8cm) wide, 60" (150cm) long, and weighed 573lb (260kg). The TOW CAP could be erected by two crewmen in under two minutes, and when not in use was stowed in two sections on the vehicle roof. The TOW CAP's initial production contract specified first deliveries in December 1976.