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OEM / ODM welcome.**Send enquiry [* SKU ZAW-421LB3·3/8" Drive Air Impact Wrench# ZAW-421LB3 3/8 inch Air WrenchThe ZAW-421LB3 Air Wrench combines power, durability, and precision to deliver exceptional performance for demanding fastening tasks. Engineered with a two-hammer mechanism, this air wrench ensures balanced and efficient torque delivery. The side exhaust design directs air discharge safely away from the operator and workspace, making it a reliable tool for professional environments.Send enquiry for ZAW-421LB3Tools catalog (PDF)Key specificationsFull series table ↓Bolt Size CapacityM12Working Torque ft-lb (Nm)81(110)MAX. Torque ft-lb (Nm)177(240)Free Speed rpm8000Air Consumption l/min (cfm)283(10)Overall Length inch (mm)7.28(185)Air Inlet P.T1/4Net Weight lbs (kgs)2.89(1.34)*](https://www.airtools.com.tw/wp-content/uploads/ZAW-421LB3.jpg)[**](https://www.facebook.com/sharer.php?u=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/)[**](https://x.com/share?url=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/)[**](https://twitter.com/share?url=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/)[**](https://threads.net/intent/post?text=ZAW-421LB3%203%2F8%20inch%20Air%20Wrench%0A%0Ahttps%3A%2F%2Fwww.airtools.com.tw%2Fzaw-421lb3-3-8-inch-air-wrench%2F)[**](mailto:?subject=ZAW-421LB3%203%2F8%20inch%20Air%20Wrench&body=Check%20this%20out%3A%20https%3A%2F%2Fwww.airtools.com.tw%2Fzaw-421lb3-3-8-inch-air-wrench%2F)[**](https://pinterest.com/pin/create/button?url=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/&media=https://www.airtools.com.tw/wp-content/uploads/ZAW-421LB3.jpg&description=ZAW-421LB3%203%2F8%20inch%20Air%20Wrench)[**](https://vkontakte.ru/share.php?url=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/&titleZAW-421LB3%203%2F8%20inch%20Air%20Wrench)[**](https://www.linkedin.com/shareArticle?mini=true&url=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/&title=ZAW-421LB3%203%2F8%20inch%20Air%20Wrench)[**](https://tumblr.com/widgets/share/tool?canonicalUrl=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/)[**](https://telegram.me/share/url?url=https://www.airtools.com.tw/zaw-421lb3-3-8-inch-air-wrench/)- [ Description ](#tab-description)[ZAW-421LB3 3/8 inch Air Wrench – Two Hammer Type, Side Exhaust](#act-sec-1)[Key Features:](#act-sec-2)[Specifications:](#act-sec-3)[Applications:](#act-sec-4)[Advantages of the ZAW-421LB3 Air Wrench:](#act-sec-5)[Why Choose the ZAW-421LB3 Air Wrench?](#act-sec-6)[Specifications](#act-specs-table)## ZAW-421LB3 3/8 inch Air Wrench – Two Hammer Type, Side Exhaust      The **ZAW-421LB3 Air Wrench** combines power, durability, and precision to deliver exceptional performance for demanding fastening tasks. Engineered with a **two-hammer mechanism**, this air wrench ensures balanced and efficient torque delivery. The **side exhaust design** directs air discharge safely away from the operator and workspace, making it a reliable tool for professional environments.      ### **Key Features:**     1. **Two-Hammer Mechanism**Delivers powerful and consistent torque for high-performance fastening. 2. Reduces vibration, enhancing operator comfort and control. 3. **Side Exhaust System**Safely directs exhaust air away from the user. 4. Maintains a clean and safe working environment. 5. **Compact and Ergonomic Design**Lightweight construction minimizes fatigue during prolonged use. 6. Designed for superior grip and easy maneuverability in tight spaces. 7. **Durable Build**Made from high-quality materials for longevity and reliability. 8. Designed to withstand heavy-duty industrial applications. 9. **Adjustable Torque Settings**Provides precise control for various fastening needs.     ### **Specifications:**     - **Drive Size:** 3/8 inch - **Torque Mechanism:** Two-hammer impact system for balanced performance. - **Exhaust Type:** Side exhaust for improved safety and cleanliness. - **Air Inlet Size:** Compatible with standard pneumatic fittings. - **Weight:** Lightweight for optimal handling and portability. - **Noise Level:** Engineered for quieter operation in busy environments.     ### **Applications:**     1. **Automotive Repair and Assembly**It is ideal for wheel nuts, engine components, and suspension work. 2. **Industrial Manufacturing**Ensures consistent performance for high-volume assembly lines. 3. **Construction and Maintenance**Reliable for heavy-duty fastening in construction equipment repair. 4. **General Workshop Use**Suitable for a wide range of fastening and disassembly tasks.     ### **Advantages of the ZAW-421LB3 Air Wrench:**     - **High Torque Output:** The two-hammer system delivers quick and reliable fastening. - **Safety and Cleanliness:** Side exhaust directs air and debris away from the operator. - **Ergonomic Design:** Lightweight and easy to handle, reducing operator fatigue. - **Versatile Applications:** Compact design allows use in tight and confined spaces. - **Durability:** Built to endure challenging work environments.     ### **Why Choose the ZAW-421LB3 Air Wrench?**      The **ZAW-421LB3** is a professional-grade air wrench that delivers unmatched performance for heavy-duty and precision tasks. Its **two-hammer mechanism** ensures efficiency, while the **side exhaust system** adds an extra layer of safety. Whether you’re working in automotive repair, industrial assembly, or general maintenance, the ZAW-421LB3 is the perfect tool.      #### **Specification:**     - Bolt Size Capacity: M12 - Working Torque: 81(110)ft-lb(Nm) - MAX. Torque: 177(240)ft-lb(Nm) - Free Speed: 8000rpm - Air Consumption: 283(10)l/min(cfm) - Overall Length: 7.28(185)inch(mm) - Air Inlet: 1/4P.T - Net Weight: 2.89(1.34)lb(kg) - Sound Level: 93dB(A)  Specifications · full series| **Model** | **Bolt Size** **Capacity** | **Working** **Torque** **ft-lb(Nm)** | **MAX.** **Torque** **ft-lb(Nm)** | **Free** **Speed** **rpm** | **Air** **Consumption** **l/min(cfm)** | **Overall** **Length** **inch(mm)** | **Air Inlet** **P.T** | **Net** **Weight** **lbs(kgs)** | **Sound** **Level** **dB(A)** | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | ZAW-412LB2 | M8 | 20(27) | 26(35) | 13000 | 198(7) | 5.71(145) | 1/4 | 1.98(0.9) | 88 | | ZAW-412LB3 | M8 | 20(27) | 26(35) | 13000 | 198(7) | 5.71(145) | 1/4 | 1.98(0.9) | 88 | | ZAW-514LB2 | M8 | 20(27) | 22(30) | 11500 | 170(6) | 6.1(155) | 1/4 | 1.98(0.9) | 87 | | ZAW-514LB3 | M8 | 20(27) | 22(30) | 11500 | 170(6) | 6.1(155) | 1/4 | 1.98(0.9) | 87 | | ZAW-417SL1 | M10 | 59(80) | 148(200) | 8000 | 226(8) | 7.2(183) | 1/4 | 2.65(1.2) | 94 | | ZAW-410LB | M10 | 59(80) | 148(200) | 7700 | 198(7) | 7.28(185) | 1/4 | 2.87(1.3) | 89 | | ZAW-517LB | M12 | 74(100) | 140(190) | 8000 | 283(10) | 6.3(160) | 1/4 | 2.65(1.2) | 87 | | ZAW-421LB3 | M12 | 81(110) | 177(240) | 8000 | 283(10) | 7.28(185) | 1/4 | 2.89(1.34) | 93 |**Recommended Gauge Air Pressure: 60~90psi**Need pricing or an OEM version of the ZAW-421LB3?**Tell us quantities and requirements. 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Featuring a two-hammer…View details → Latest News- [How Shock Reduced Air Hammers Changed the Industry](https://www.airtools.com.tw/how-shock-reduced-air-hammers-changed-the-industry/) - [From Assembly Line to Quality Record: A Practical Guide to Torque Measurement](https://www.airtools.com.tw/from-assembly-line-to-quality-record-a-practical-guide-to-torque-measurement/) - [New tutorial video available for Torque Monitoring System](https://www.airtools.com.tw/new-tutorial-video-available-for-torque-monitoring-system/) - [Professional Fastening Solutions with New Dual-Flex Angle Air Impact Wrenches: ZIW340FA and ZIW410FA](https://www.airtools.com.tw/professional-fastening-solutions-with-new-dual-flex-angle-air-impact-wrenches-ziw340fa-and-ziw410fa/) - [Next-Generation Composite Air Impact Wrenches: ZIW1020C and ZIW1010C MINI](https://www.airtools.com.tw/next-generation-composite-air-impact-wrenches-ziw1020c-and-ziw1010c-mini/) ISO 9001:2015 certified professional OEM/ODM air pneumatic tool, gear reducer, wireless transducer, torque controller, torque monitoring system, torque measuring & torque calibration equipment and precision machining parts manufacturer from Taiwan (R.O.C) with over 40 years of experiences in the industry.Passion For Innovation- [Home](https://www.airtools.com.tw/) - [News](https://www.airtools.com.tw/news/) - [About us](https://www.airtools.com.tw/about-china-pneumatic-corporation/) - [Products](/products) - [Product catalog](https://www.airtools.com.tw/product-catalog/) - [Torque Control](https://www.airtools.com.tw/torque-control-system/) - [Resources](https://www.airtools.com.tw/resources/) - [Videos](https://www.youtube.com/@AirtoolsTw) - [Unit Converter](https://www.airtools.com.tw/unit-converter/) - [Contact us](https://www.airtools.com.tw/contact-us/) Copyright 1984 - 2026 © **China Pneumatic Corporation (CPC). 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