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At a glance
Measured figures
Length
Single source70.8 in (1.80 m)[source]
GBU-31 · Specifications table · Length
Single sourceConfiguration
| Specification | GBU-39 Small Diameter Bomb | Joint Direct Attack Munition |
|---|---|---|
| Type | Glide bomb[source] | guidance kit that converts unguided bombs[source]JDAM · guidance kit; individual equipped bomb specifications are variant scoped |
| Place of origin | United States[source] | United States[source] |
| In service | 2006–present[source] | Since 1999[source] |
| Used by | United States Israel Italy Netherlands Ukraine Saudi Arabia Australia |
GBU-32 · Specifications table · Length
Single sourceGBU-38 · Specifications table · Length
Single sourceGBU-54 LJDAM · Specifications table · Length
Single sourceGBU-55 LJDAM · Specifications table · Length · est
Single sourceGBU-56 LJDAM · Specifications table · Length
Single source7 ft 8.6 in (2.352 m)[source]GBU-38 · Specifications table · Length
7 ft 10 in (2.38 m)[source]GBU-54 LJDAM · Specifications table · Length
9 ft 11.5 in (3.035 m)[source]GBU-32 · Specifications table · Length
10 ft (3.05 m) est.[source]GBU-55 LJDAM · Specifications table · Length
12 ft 9 in – 12 ft 5 in (3.879–3.774 m)[source]GBU-31 · Specifications table · Length
12 ft 8 in (3.85 m)[source]GBU-56 LJDAM · Specifications table · Length
packed
Single sourcewings extended
Single source5 ft 3.3 in (1.61 m) (wings extended) 7.5 in (190 mm) packed[source]
GBU-31 · Specifications table · Span
Single sourceGBU-32 · Specifications table · Span
Single sourceGBU-38 · Specifications table · Span
Single sourceGBU-54 LJDAM · Specifications table · Span
Single sourceGBU-55 LJDAM · Specifications table · Span
Single sourceGBU-56 LJDAM · Specifications table · Span
Single source14 in (356 mm)[source]GBU-38 · Specifications table · Span
17 in (431.8 mm)[source]GBU-54 LJDAM · Specifications table · Span
19.6 in (498 mm)[source]GBU-32 · Specifications table · Span
19.6 in (498 mm)[source]GBU-55 LJDAM · Specifications table · Span
25 in (635 mm)[source]GBU-31 · Specifications table · Span
25.3 in (642.6 mm)[source]GBU-56 LJDAM · Specifications table · Span
Mass
Single source285 lb (129 kg)[source]
GBU-31 · Specifications table · Launch weight · Mass · source measurement 1
Single sourceGBU-31 · Specifications table · Launch weight · Mass · source measurement 2
Single sourceGBU-32 · Specifications table · Launch weight
Single sourceGBU-38 · Specifications table · Launch weight
Single sourceGBU-54 LJDAM · Specifications table · Launch weight · Mass · source measurement 1
Single sourceGBU-54 LJDAM · Specifications table · Launch weight · Mass · source measurement 2
Single sourceGBU-55 LJDAM · Specifications table · Launch weight · est
Single sourceGBU-56 LJDAM · Specifications table · Launch weight · Mass · source measurement 1
Single sourceGBU-56 LJDAM · Specifications table · Launch weight · Mass · source measurement 2
Single sourceGBU-62 JDAM-ER · Specifications table · Launch weight
Single sourceGBU-63 JDAM-ER · Specifications table · Launch weight
Single sourceGBU-64 JDAM-ER · Specifications table · Launch weight
Single source559 lb (253.6 kg)[source]GBU-38 · Specifications table · Launch weight
575 / 591 lb (260.8 / 268 kg)[source]GBU-54 LJDAM · Specifications table · Launch weight
620 lb (280 kg)[source]GBU-62 JDAM-ER · Specifications table · Launch weight
1,015 lb (460.5 kg)[source]GBU-32 · Specifications table · Launch weight
1,047 lb (475 kg) est.[source]GBU-55 LJDAM · Specifications table · Launch weight
1,080 lb (490 kg)[source]GBU-63 JDAM-ER · Specifications table · Launch weight
2,040 / 2,120 lb (925.4 / 961.4 kg)[source]GBU-31 · Specifications table · Launch weight
2,120 / 2,135 lb (961.6 / 968.4 kg)
Operational; All SDB I variants over when air-dropped
Single sourceOperational; when launched as a part of the GLSDB
Single sourceAll SDB I variants over 60 nmi (69 mi; 111 km) when air-dropped, 150 km (93 mi; 81 nmi) when launched as a part of the GLSDB ,[source]
GBU-31 · Specifications table · Max range
Single sourceGBU-32 · Specifications table · Max range
Single sourceAFX 1209 MBX ("multiphase blast explosive"), composite case Laser SDB (GBU-39B/B)
Single sourceAFX 757 enhanced blast insensitive explosive, penetrating steel case
Single sourceAll SDB I variants total SDB I (GBU-39/B)
Single sourceExplosive fill AFX 757 Insensitive munition certified PBX Penetration: greater than 3 ft (0.91 m) of steel reinforced concrete SDB FLM (GBU-39A/B)
Single sourceAll SDB I variants 206 lb (93 kg) total SDB I (GBU-39/B) Explosive fill: 36 lb (16 kg) AFX 757 Insensitive munition certified PBX Penetration: greater than 3 ft (0.91 m) of steel reinforced concrete SDB FLM (GBU-39A/B) 137 lb (62 kg) AFX 1209 MBX ("multiphase blast explosive"), composite case Laser SDB (GBU-39B/B) 36 lb (16 kg) AFX 757 enhanced blast insensitive explosive, penetrating steel case[source]
Bars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
See operators[source] |
| Wars | War in Afghanistan , Iraq War , Military intervention against ISIL , Syrian Civil War , Russian invasion of Ukraine , Gaza war[source] | NATO bombing of Yugoslavia Kurdish–Turkish conflict War on terror War in Afghanistan Iraq War War in North-West Pakistan Al-Qaeda insurgency in Yemen Somalia War (2006–2009) Somali Civil War First Libyan Civil War Syrian Civil War American-led intervention in the Syrian Civil War American-led intervention in Iraq Turkish military intervention in Syria Operation Olive Branch War in Iraq (2013–2017) Yemeni Civil War Saudi Arabian-led intervention in Yemen Houthi–Saudi Arabian conflict Siege of Marawi Russian invasion of Ukraine Gaza war Israel–Hezbollah conflict (2023–present) 2024 Israeli invasion of Lebanon Operation Prosperity Guardian Operation Poseidon Archer Twelve-Day War 2026 Iran war[source] |
|---|
| Manufacturer | Boeing Integrated Defense Systems[source] | Boeing Defense, Space & Security[source] |
|---|
| Unit cost | US$40,000 (SDB I, FY 2021)[source] | US $21,000–$36,000[source] |
|---|
| Produced | 2005–present[source] | — |
|---|
| No. built | 17,000+[source] | — |
|---|
| Variants | GBU-39/B GBU-39A/B GBU-39B/B[source] | See variants[source] |
|---|
| Warhead | SDB I (GBU-39/B) penetrating blast fragmentation, penetrating steel nosecone SDB FLM (GBU-39A/B) blast ultra-low fragmentation Laser SDB (GBU-39B/B) penetrating blast fragmentation, w/o steel nosecone[source] | Mark 82[source]GBU-38 · Specifications table · Warhead Mark 82[source]GBU-54 LJDAM · Specifications table · Warhead Mark 82[source]GBU-62 JDAM-ER · Specifications table · Warhead Mark 82[source]GBU-75 JDAM-LR · Specifications table · Warhead Mark 83[source]GBU-32 · Specifications table · Warhead Mark 83[source]GBU-55 LJDAM · Specifications table · Warhead Mark 83[source]GBU-63 JDAM-ER · Specifications table · Warhead Mark 84 & BLU-109[source]GBU-31 · Specifications table · Warhead Mark 84 & BLU-109[source]GBU-56 LJDAM · Specifications table · Warhead Mark 84 & BLU-109[source]GBU-64 JDAM-ER · Specifications table · Warhead |
|---|
| Guidance system | SDB I (GBU-39/B) SDB FLM (GBU-39A/B) GPS / INS Laser SDB (GBU-39B/B) GPS / INS with terminal semi-active laser guidance[source] | — |
|---|
| Accuracy | SDB I (GBU-39) 3 ft (1 m) CEP[source] | GPS: 16 ft 5 in (5 m) INS: 98 ft 5 in (30 m)[source]GBU-38 · Specifications table · Accuracy ( CEP ) GPS: 16 ft 5 in (5 m) INS: 98 ft 5 in (30 m)[source]GBU-54 LJDAM · Specifications table · Accuracy ( CEP ) GPS: 16 ft 5 in (5 m) INS: 98 ft 5 in (30 m)[source]GBU-32 · Specifications table · Accuracy ( CEP ) GPS: 16 ft 5 in (5 m) INS: 98 ft 5 in (30 m)[source]GBU-55 LJDAM · Specifications table · Accuracy ( CEP ) GPS: 16 ft 5 in (5 m) INS: 98 ft 5 in (30 m)[source]GBU-31 · Specifications table · Accuracy ( CEP ) GPS: 16 ft 5 in (5 m) INS: 98 ft 5 in (30 m)[source]GBU-56 LJDAM · Specifications table · Accuracy ( CEP ) |
|---|
| Role | 250-pound (110 kg) precision-guided glide bomb[source] | — |
|---|
| Source measurement | The GBU-39/B Small Diameter Bomb ( SDB ) is a 250-pound (110 kg) precision-guided glide bomb that is intended to allow aircraft to carry a greater number of smaller, more accurate bombs. Most US Air Force aircraft will be able to carry (using the BRU-61/A rack ) a pack of four SDBs in place of a single 2,000-pound (910 kg) Mark 84 bomb . It first entered service in 2006. The Ground Launched Small Diameter Bomb (GLSDB) was later developed to enable the SDB to be launched from a variety of ground launchers and configurations.[source]GBU-39 Small Diameter Bomb · Lead; only the objects and conditions stated in this passage The small size of the bomb allows a strike aircraft to carry more of them than previously available bombs, and thus strike more targets. The SDB carries approximately 36 lb (16 kg) of AFX-757 high explosive . AFX-757 is an insensitive enhanced blast polymer-bonded explosive , containing 25% RDX high explosive, 30% ammonium perchlorate oxidizer, 33% aluminium powder , 4.44% HTPB binder and 6.56% dioctyl adipate plasticizer. AFX-757 has improved air blast equivalent, 1.39 times more than Composition B , but low brisance due to low RDX content. It has integrated "DiamondBack" type wings which deploy after release, increasing the glide time and therefore the maximum range. Its size and accuracy allow for an effective munition with less collateral damage . Warhead penetration is 3 ft (1 m) of steel reinforced concrete under 3 ft (1 m) of earth and the fuze has electronic safe and fire (ESAF) cockpit selectable functions, including air burst and delayed options.[source]GBU-39 Small Diameter Bomb · Description; only the objects and conditions stated in this passage The SDB I has a circular error probable (CEP) precision of 3 ft (1 m). CEP is reduced by updating differential GPS offsets prior to weapon release. These offsets are calculated using an SDB Accuracy Support Infrastructure, consisting of three or more GPS receivers at fixed locations transmitting calculated location to a correlation station at the theatre Air Operations Center . The corrections are then transmitted by Link 16 to SDB-equipped aircraft.[source]GBU-39 Small Diameter Bomb · Description; only the objects and conditions stated in this passage In January 2016, the Air Force awarded a contract to Scientific Systems Co. Inc. to demonstrate the company's ImageNav technology, a vision-based navigation and precision targeting system that compares a terrain database with the host platform's sensor to make course corrections. ImageNav technology has demonstrated target geo-location and navigation precision within three meters.[source]GBU-39 Small Diameter Bomb · Description / Alternative guidance and warheads; only the objects and conditions stated in this passage Under a contract awarded in September 2006, Boeing developed a version of the SDB I that replaces the steel casing with a lightweight composite casing and the warhead with a focused-blast explosive such as dense inert metal explosive (DIME). This should further reduce collateral damage when using the weapon for pinpoint strikes in urban areas. The USAF intends to use the same FLM casing on a weapon of 500 pounds (227 kg). Boeing celebrated the delivery of the first 50 FLM weapons on 28 February 2008 and delivered the last of the 500 FLMs under contract in December 2013.[source]GBU-39 Small Diameter Bomb · Variants / GBU-39A/B – SDB Focused Lethality Munition (FLM); only the objects and conditions stated in this passage In 2011 Boeing began testing on a laser-guided version of the baseline SDB, integrating the same Semi Active Laser (SAL) from the GBU-54 Laser JDAM. Boeing claimed to have successfully hit targets moving at 30 mph (48.3 km/h) and 50 mph (80.5 km/h).[source]GBU-39 Small Diameter Bomb · Variants / GBU-39B/B – Laser SDB; only the objects and conditions stated in this passage In August 2024, CNN reported that Israel used the GBU/39 again in the Al-Tabaeen school attack , killing over 90 people according to the Gaza Civil Defense. The IDF stated that it was a precision strike against a Hamas command and control center that killed at least 19 Hamas and PIJ militants.[source]GBU-39 Small Diameter Bomb · Operational history; only the objects and conditions stated in this passage | — |
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| Designer | — | McDonnell Douglas[source] |
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| Designed | — | Late 1980s–1996[source] |
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| Launch platform | — | F-15E , F-16 , F/A-18 , F/A-18E/F , AV-8B , A-10 , B-1B , B-52H , F-22 , B-2A , F-35 , MQ-9 , MiG-29 , Su-27 , Tornado , Gripen[source] |
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| References | — | Janes & The War Zone[source] |
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| Guidance | — | integrated inertial guidance system coupled to a Global Positioning System (GPS) receiver[source]JDAM · base guidance GPS , INS[source]GBU-38 · Specifications table · Guidance type GPS, INS, SAL[source]GBU-54 LJDAM · Specifications table · Guidance type GPS, INS[source]GBU-62 JDAM-ER · Specifications table · Guidance type GPS, INS[source]GBU-75 JDAM-LR · Specifications table · Guidance type GPS, INS[source]GBU-32 · Specifications table · Guidance type GPS, INS, SAL[source]GBU-55 LJDAM · Specifications table · Guidance type GPS, INS[source]GBU-63 JDAM-ER · Specifications table · Guidance type GPS, INS[source]GBU-31 · Specifications table · Guidance type GPS, INS, SAL[source]GBU-56 LJDAM · Specifications table · Guidance type GPS, INS[source]GBU-64 JDAM-ER · Specifications table · Guidance type |
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| Lug spacing | — | 14 in (356 mm)[source]GBU-38 · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-54 LJDAM · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-62 JDAM-ER · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-75 JDAM-LR · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-32 · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-55 LJDAM · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-63 JDAM-ER · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-31 · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-56 LJDAM · Specifications table · Lug spacing 14 in (356 mm)[source]GBU-64 JDAM-ER · Specifications table · Lug spacing |
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2,180 lb (990 kg)[source]GBU-64 JDAM-ER · Specifications table · Launch weight
GBU-38 · Specifications table · Max range
Single sourceGBU-54 LJDAM · Specifications table · Max range
Single sourceGBU-55 LJDAM · Specifications table · Max range
Single sourceGBU-56 LJDAM · Specifications table · Max range
Single sourceGBU-62 JDAM-ER · Specifications table · Max range · >
Single sourceGBU-63 JDAM-ER · Specifications table · Max range
Single sourceGBU-64 JDAM-ER · Specifications table · Max range
Single sourceGBU-75 JDAM-LR · Specifications table · Max range · > est
Single source13 nmi (24 km)[source]GBU-38 · Specifications table · Max range
13 nmi (24 km)[source]GBU-54 LJDAM · Specifications table · Max range
> 39.1 nmi (72.5 km)[source]GBU-62 JDAM-ER · Specifications table · Max range
> 330 nmi (611 km) est.[source]GBU-75 JDAM-LR · Specifications table · Max range
13 nmi (24 km)[source]GBU-32 · Specifications table · Max range
13 nmi (24 km)[source]GBU-55 LJDAM · Specifications table · Max range
39.1 nmi (72.5 km)[source]GBU-63 JDAM-ER · Specifications table · Max range
13 nmi (24 km)[source]GBU-31 · Specifications table · Max range
13 nmi (24 km)[source]GBU-56 LJDAM · Specifications table · Max range
39.1 nmi (72.5 km)[source]GBU-64 JDAM-ER · Specifications table · Max range