# Boston Gear 30267390 872B-3.9K-M1 Helical Speed Reducer 3.9:1 Ratio - MROSupply.com

***Boston Gear 30267390 872B-3.9K-M1 helical speed reducer with a 3.9:1 ratio. This unit features a helical gear design for smooth, quiet operation and high efficiency in industrial power transmission applications. The cast iron housing provides durability and thermal capacity for continuous duty.***



## Product details:

- Catalog number: 872B-3.9K-M1
- SKU: 45637
- Price: ***$2,887.67*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Boston Gear](https://www.mrosupply.com/brands/boston-gear/)
- Category: 
    - [Solid Input Shaft Inline Helical Reducers](htts://www.mrosupply.com/speed-reducers/inlineconcentric-speed-reducers/inline-helical-speed-reducers/solid-input-shaft-inline-helical-reducers/)
    - [Inline Helical Speed Reducers](htts://www.mrosupply.com/speed-reducers/inlineconcentric-speed-reducers/inline-helical-speed-reducers/)
    - [Inline/Concentric Speed Reducers](htts://www.mrosupply.com/speed-reducers/inlineconcentric-speed-reducers/)
    - [Speed Reducers](htts://www.mrosupply.com/speed-reducers/)
- Unit of measure: each
- Weight: 86.100 lb
- Technicall support: contact supplier for technical support on 800-626-2120


## Product images:
- https://static.mrosupply.com/images/noimage.webp


## Product documents / software:

- [Catalog Product Section](https://documents.mrosupply.com/product_documents/D0/D02379/p-1485-bg_800b_in-line_helical.pdf)
- [Engineering Data](https://documents.mrosupply.com/product_documents/D0/D02637/p-1485-bg_engineering-section_HDosJBH.pdf)
- [Full Catalog](https://documents.mrosupply.com/product_documents/D0/D02637/p-1485-bg_fKcoPkR.pdf)
- [Installation & Operation Manual](https://documents.mrosupply.com/product_documents/D0/D02637/p-3010-bg_40ahQ0b.pdf)

## Product's reviews:
- New lead screw gear. - Used this gear on a new lead screw l made for my old 1919 LeBlond belt drive lathe. It worked great for my application.
- Na40 - Fast shipping!!! Great to do business with.
- Good seller - Catalogue item, good price, fast delivery = good seller
- Quality - very high quality. using these gears in a model 9 cylinder radial engine with a 1"
bore. about 8 h.p. , for oil pump a scavenge pump timing gears and distributor . very good quality gears.