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Measured figures
Configuration
| Specification | FMK-1 mine | GBU-39 Small Diameter Bomb |
|---|---|---|
| Type | anti-personnel blast mine[source] | Glide bomb[source] |
| Fuze configuration | when fitted with a stiffened pressure plate, is also used as the fuze for the FMK-3 and FMK-5 anti-tank mines[source]Distinct stiffened-pressure-plate fuze configuration, not live APmine stock | — |
| Material | circular plastic body[source] | — |
| Current Argentine retained configuration | the only stocks of the mine that have been retained have the thick pressure cap welded on[source]Treaty-related retained fuze configuration; no unsourced live anti-personnel stock assumption | — |
packed
Single sourcewings extended
Single source5 ft 3.3 in (1.61 m) (wings extended) 7.5 in (190 mm) packed[source]
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]
of a TNT / RDX mix
Single sourceSourceFMK1 configuration; operatingpressure alternatives remain separately qualified · of a TNT / RDX mix
Single source152 g of a TNT / RDX mix[source]
152 g of a TNT / RDX mix[source]SourceFMK1 configuration; operatingpressure alternatives remain separately qualified
AFX 1209 MBX ("multiphase blast explosive"), composite case Laser SDB (GBU-39B/B)
Single sourceAFX 757 enhanced blast insensitive explosive, penetrating steel case
Single sourceBars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
| Operating pressure | 5 kg (without stud fitted) 15 to 50 kg (with stud fitted) 300 kg (with stud and stiff pressure plate)[source]SourceFMK1 configuration; operatingpressure alternatives remain separately qualified | — |
|---|
| Country of origin | Argentina[source]Inventory Origin column; table 9, row 32, cell 3; revision 1374043591; retrieved 2026-09-30 | — |
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| Place of origin | — | United States[source] |
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| In service | — | 2006–present[source] |
|---|
| Used by | — | United States Israel Italy Netherlands Ukraine Saudi Arabia Australia[source] |
|---|
| Wars | — | War in Afghanistan , Iraq War , Military intervention against ISIL , Syrian Civil War , Russian invasion of Ukraine , Gaza war[source] |
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| Manufacturer | — | Boeing Integrated Defense Systems[source] |
|---|
| Unit cost | — | US$40,000 (SDB I, FY 2021)[source] |
|---|
| Produced | — | 2005–present[source] |
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| No. built | — | 17,000+[source] |
|---|
| Variants | — | GBU-39/B GBU-39A/B GBU-39B/B[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] |
|---|
| 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] |
|---|
| 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 |
|---|
| Reported operators | — |
|
|---|
All 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]