美國(guó)科士巴格FORMSPRAG單向離合器又稱FORMSPRAG單向離合器、FORMSPRAG單向軸承或FORMSPRAG逆止器，也是*能單一方向（順時(shí)針或逆時(shí)針方向）傳動(dòng)的機(jī)械傳動(dòng)基礎(chǔ)件，當(dāng)動(dòng)力源驅(qū)動(dòng)被動(dòng)元件時(shí)只能單一方向傳動(dòng)，若動(dòng)力源轉(zhuǎn)變方向時(shí)，（如順時(shí)針變?yōu)槟鏁r(shí)針方向），被動(dòng)元件則會(huì)自動(dòng)脫離不產(chǎn)生任何動(dòng)力傳送的功能。
型號(hào)列舉：FORMSPRAG離合器#708；MODEL 600；MODEL #708 WITH FSO 700 CLUTCH；036-01-007-6；BB35-2K；FSR-3/.500GRGH；FS-04 R.H；備件CL43152-3……
FORMSPRAG公司旗下品牌產(chǎn)品有：Matrix International、英國(guó)Matrix電磁離合器、Matrix離合器、Matrix制動(dòng)器、Matrix剎車盤；Warner Linear Warner電動(dòng)推桿、Warner滑軌；TB Wood‘s:TB Wood''s聯(lián)軸器， TB Wood‘s皮帶驅(qū)動(dòng)器，TB Wood‘s離合器及制動(dòng)器；　　Wichita Clutch and Industrial Clutch：Wichita Clutch制動(dòng)器、Wichita離合器；Twiflex Limited：英國(guó)Twiflex聯(lián)軸器、英國(guó)Twiflex控制器、Twiflex控制板、Twiflex執(zhí)行器、Twiflex插件板、Twiflex夾鉗；Formsprag Clutch：美國(guó)Formsprag Clutch 離合器、Formsprag剎車、Formsprag軸承、Formsprag分度卡盤、Marland Clutch：美國(guó)Marland Clutch 離合器、Marland制動(dòng)器、Marland軸承；Stieber Clutch：德國(guó)Stieber離合器、STIEBER離合器、Stieber單向離合器、STIEBER逆止器、STIEBER單向軸承；Boston Gear：美國(guó)Boston離合器、Boston Gear 減速機(jī)、Boston軸承、Boston制動(dòng)器、Boston抱閘；Huco Dynatork：Huco Dynatork空氣馬達(dá)、Huco Dynatork聯(lián)軸器；Ameridrives Couplings：美國(guó)Ameridrives齒輪聯(lián)軸器、Ameridrives**聯(lián)軸器、Ameridrives彈性聯(lián)軸器、Ameridrives萬(wàn)向聯(lián)軸器；Industrial Clutch：美國(guó)Industrial Clutch離合器、Industrial Clutch制動(dòng)器、Industrial Clutch液壓控制；Bibby Transmissions：英國(guó)Bibby聯(lián)軸器、Bibby力矩限制器；Nuttall Gear and Delroyd Worm Gear：　　美國(guó)Nutall Gear 減速機(jī)、Nutall齒輪馬達(dá)；

Saftek Friction：Saftek Friction控制器；　　Altra Industrial Motion ：Asia Pacific and Africa。
Formsprag Clutch (South Beloit, IL) has introduced a new high speed backstop designed with inner race centrifugal throw-out sprags to meet the backstopping requirements of inclined conveyors or bucket elevators that use a gear reducer with the backstop mounted externally on the high speed or intermediate shaft.