---
product_id: 57944585
title: "Boston Gear BF133/4X7/8 Shaft Coupling, Spider Ring (3-Jaw), Coupling Size BF13, 1.625\" Hub Diameter, 0.875\" Driven Hub Bore, 0.750\" Driver Hub Bore, 1.969\" Max Outer Diameter, 4 horsepower Max HP, 160 pounds per inch Max Torque"
brand: "boston gear"
price: "$7.63"
currency: USD
in_stock: false
url: https://www.desertcart.ec/products/57944585-boston-gear-bf133-4x7-8-shaft-coupling-spider-ring-3
store_origin: EC
region: Ecuador
---

# 4 HP max power 1.625" hub diameter 3-jaw design Boston Gear BF133/4X7/8 Shaft Coupling, Spider Ring (3-Jaw), Coupling Size BF13, 1.625" Hub Diameter, 0.875" Driven Hub Bore, 0.750" Driver Hub Bore, 1.969" Max Outer Diameter, 4 horsepower Max HP, 160 pounds per inch Max Torque

**Brand:** boston gear
**Price:** $7.63
**Availability:** ❌ Out of Stock

## Summary

> 🔗 Connect with Confidence!

## Quick Answers

- **What is this?** Boston Gear BF133/4X7/8 Shaft Coupling, Spider Ring (3-Jaw), Coupling Size BF13, 1.625" Hub Diameter, 0.875" Driven Hub Bore, 0.750" Driver Hub Bore, 1.969" Max Outer Diameter, 4 horsepower Max HP, 160 pounds per inch Max Torque by boston gear
- **How much does it cost?** $7.63 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/57944585-boston-gear-bf133-4x7-8-shaft-coupling-spider-ring-3)

## Best For

- boston gear enthusiasts

## Why This Product

- Trusted boston gear brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Shock Absorption:** Urethane spider ring minimizes vibration and shock.
- • **Secure Attachment:** Keyway and set screw locking ensure a firm grip.
- • **High Torque Capacity:** Handles up to 160 lbs/in of torque effortlessly.
- • **Unmatched Durability:** Crafted from powdered metal for long-lasting performance.
- • **Versatile Compatibility:** Connects shafts of varying sizes with 3/4" x 7/8" bores.

## Overview

The Boston Gear BF133/4X7/8 Shaft Coupling is engineered for robust performance, featuring a 3-jaw design with a 1.625" hub diameter and a maximum torque capacity of 160 lbs/in. Its urethane insert effectively absorbs shock and vibration, ensuring a smooth operation while connecting shafts of different sizes. Built from durable powdered metal, this coupling promises longevity and reliability in demanding applications.

## Description

Flexible couplings are used to link two rotating shafts that are not aligned in order to transmit the rotational power, known as torque, from one shaft to the other. Most flexible couplings consist of two hubs and a middle assembly; each hub attaches to a shaft while the middle assembly flexes between the hubs to accommodate the misalignment of the two shafts. Shaft misalignments are generally either parallel or angular and cause complications to transmitting rotational power from one shaft to another in the form of stresses, loads, vibrations, and other forces, which vary from one type of misalignment to another. Flexible couplings are used in a broad range of applications, such as in motor vehicles, conveyors, escalators, agricultural, forestry and mining equipment, aeronautics, robotics and space exploration, among others.Boston Gear manufactures gears, gear drives, bearings, valves, shaft collars, couplings, and other power and fluid transmission components. The company, founded in 1877, is headquartered in Charlotte, NC, and meets International Organization for Standardization (ISO) standard 9001:2008 standard.

## Features

- Two 3-jaw coupling halves and one coupling insert for connecting two shafts together
- Spider ring urethane insert absorbs shock and vibration
- Powdered metal for resistance to wear and long service life
- 3/4" x 7/8" bores for connecting shafts of different sizes
- Keyway and set screw locking for secure attachment

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Boston Gear |
| Part number | BF133/4X7/8 |
| Item Weight | 136 g |
| Package Dimensions | 17.53 x 10.41 x 1.02 cm; 136.08 Grams |
| Item model number | 3312 |
| Item Package Quantity | 1 |

## Images

![Boston Gear BF133/4X7/8 Shaft Coupling, Spider Ring (3-Jaw), Coupling Size BF13, 1.625" Hub Diameter, 0.875" Driven Hub Bore, 0.750" Driver Hub Bore, 1.969" Max Outer Diameter, 4 horsepower Max HP, 160 pounds per inch Max Torque - Image 1](https://m.media-amazon.com/images/I/41WB-jcrUoL.jpg)
![Boston Gear BF133/4X7/8 Shaft Coupling, Spider Ring (3-Jaw), Coupling Size BF13, 1.625" Hub Diameter, 0.875" Driven Hub Bore, 0.750" Driver Hub Bore, 1.969" Max Outer Diameter, 4 horsepower Max HP, 160 pounds per inch Max Torque - Image 2](https://m.media-amazon.com/images/I/71Ikfjky7qL.jpg)

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**Shop now:** [https://www.desertcart.ec/products/57944585-boston-gear-bf133-4x7-8-shaft-coupling-spider-ring-3](https://www.desertcart.ec/products/57944585-boston-gear-bf133-4x7-8-shaft-coupling-spider-ring-3)

---

*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-01-24*