Reply #20: It all depends on several factors how far a grenade can be thrown.

[Stand and Fight]

For one there are several types of grenades, to include the following:

What types of grenades should every soldier be able to identify?
• M67 Fragmentation
• M18 Colored Smoke
• M34 WP Smoke
• AN-M8 HC Smoke
• AN-M14 TH3 Incendiary
• ABC-M25A2 CS Riot Control



About the M67 Fragmentation Grenade:
• Body - steel sphere.
• Filler - 6.5 ounces of Composition B.
• Fuse - M213.
• Weight - 14 ounces.
• Safety clip - yes.
• Capabilities - can be thrown 40 meters by average soldier. The effective casualty-producing radius is 15 meters. Although the killing radius is 5 meters and the casualty-producing radius is 15, the fragments can disperse as far away as 230 meters.
• Color/markings - olive drab body with a single yellow band at the top. Nomenclature and or lot number markings are in yellow.



About the M18 Colored Smoke Grenade:
• Body - sheet steel cylinder with four emission holes at the top and one at the bottom to allow smoke release when the grenade is ignited.
• Filler - 11.5 ounces of colored smoke mixture (red, green, yellow, and violet).
• Fuse - M201A1.
• Weight - 19 ounces.
• Safety clip - no.
• Capabilities - can be thrown 35 meters by average soldier. The grenade produces a cloud of colored smoke for 50 to 90 seconds.
• Color/markings - olive drab body with the top indicating the smoke color.



About the M34 WP Smoke Grenade:
Body - The M34 WP grenade body is compressed fiber or plastic sphere.
• Filler - The filler has 15 ounces of white phosphorous.
• Fuse - The fuse is an M206A2.
• Weight - The grenade weighs 27 ounces.
• Capabilities - The average soldier can throw the grenade 30 meters. The grenade has a bursting radius of 35 meters. All friendly personnel within this 35-meter area should be in a covered position to avoid being struck by burning particles. The WP filler burns for about 60 seconds at a temperature of 5,000 degrees Fahrenheit. This intense heat causes the smoke produced by the grenade to rise rapidly, especially in cool climates, making the M34 grenade less desirable for use as a screening agent.
• Color and Markings - Under the old ammunition color-coding system, the white phosphorous grenade is light gray with a single yellow band and yellow markings. Under the new standard color-coding system, the M34 grenade is light green with a single yellow band and light red markings.



About the AN-M8 HC Smoke Grenade:
• Body - sheet steel cylinder.
• Filler - 19 ounces of Type C, HC smoke mixture.
• Fuse - M201A1.
• Weight - 24 ounces.
• Safety clip - no.
• Capabilities - can be thrown 30 meters by average soldier. The grenade emits a dense cloud of white smoke for 105 to 150 seconds. The AN-M8 Grenade produces harmful hydrochloric fumes that irritate the eyes, throat and lungs. It should not be used in closed-in areas unless soldiers are wearing protective masks.
• Color/markings - light green body with black markings and a white top.



About the AN-M14 TH3 Incendiary:
• Body - sheet metal.
• Filler - 26.5 ounces of thermate (TH3) mixture.
• Fuse - M201A1.
• Weight - 32 ounces.
• Safety clip - no.
• Capabilities - can be thrown 25 meters by average soldier. A portion of the thermate mixture is converted to molten iron, which burns at 4,000 degrees Fahrenheit. It will fuse together the metallic parts of any object that it contacts. Thermate is an improved version of thermite, the incendiary agent used in hand grenades during World War II. The thermate filler of the AN-M14 grenade burns for 40 seconds and can burn through a 1/2-inch homogeneous steel plate. It produces its own oxygen and will burn under water.
• Color/markings - gray with purple markings and a single purple band (current grenades). Under the standard color-coding system, incendiary grenades are light red with black markings.



About the ABC M25A2 CS Riot Control:
• Body - compressed fiber or plastic.
• Filler - CS1 varies in weight and composition according to the type of agent contained in the grenade. All fillers are mixed with silica aerogel for increased dissemination efficiency.
• Fuse - integral.
• Weight - 8 ounces.
• Safety clip - no.
• Capabilities - can be thrown 50 meters by average soldier. The radius of burst (visible cloud agent) is about 5 meters, but grenade fragments may project as far as 25 meters.
• Color/markings - gray body with red band and red markings.

What are the three characteristics of all hand grenades?
1. Employment range is short
2. Small effective casualty radius
3. Delay element permits safe throwing


In what five areas can the hand grenade assist the individual soldier in the accomplishment of the mission?
1. Producing casualties
2. Signaling
3. Screening
4. Producing incendiary effects
5. Riot control



What are the four general types of hand grenades?
1. Fragmentation - time delay and impact M68; grenades to inflect casualties
2. Chemical/Smoke - canister type grenades used for signaling, screening, or CBR
3. Riot Control - bursting type grenades or burning type grenades used for control of unruly crowds
4. Special Purpose - grenades used for specific results to include: Incendiary - Used to destroy by heat, Concussion - Used for destruction by shock wave, Practice - Used for training



What 6 things should you look for when inspecting grenades for defects?
1. Ensure the fuse is not unscrewed from the body of the grenade
2. Ensure the safety clip is in the correct position, if no safety clip, attach one.
3. Check the safety clip for bends and security
4. Check safety lever for breaks
5. Check safety ring for cracks
6. Check for dirt and wipe off the dirt if it is necessary

SOURCE: http://www.armystudyguide.com/grenades/studyguide.htm
When I was in this was a pretty good indicator as to how far a grenade -- the varied types, of course -- can be thrown. Keep in mind that when most people refer to a grenade they are refering to a fragmentation grenade.