Unistrut channel nuts and bolts play a crucial role in various construction and industrial applications. Understanding their specifications, particularly the threading, ensures a secure and stable assembly. This article focuses on the importance of “1 1 4 All Thread” understanding, encompassing materials, finishes, thread standards, and recommended torque values.
Material and Finish Options for Unistrut Channel Nuts
Unistrut channel nuts are typically manufactured from mild cold-rolled steel coil. After stamping and machining, they undergo case hardening to enhance their bite into the Unistrut channel. Screws generally adhere to SAE J429 GR 2 standards, exceeding ASTM A307 specifications with a Proof Load of 55KSI and Tensile Load of 74 KSI. Material selection varies based on bolt size:
- 1/4″ & 5/16″ bolts: A1011 SS GR33
- 3/8″, 7/16″ & 1/2″ bolts: A576 GR1015 Modified
- 5/8″ & 3/4″ bolts: A36 or A675 GR60
- 7/8″ bolts: A36
Several finishes are available to enhance durability and corrosion resistance:
- Electro-galvanized (EG): Conforms to ASTM B633 type III SC1
- Hot-dipped galvanized (HG): Conforms to ASTM A153
- Plain (PL)
- Unistrut Defender™ (DF): Conforms to ASTM A1059
It’s important to note that Perma Green finish, while commercially viable, may exhibit scuffs and scratches. For a flawless appearance, touch-up paint is recommended. Standard hardware, like hex nuts, bolts, and washers, usually receive an Electro-Galvanized (EG) finish compliant with ASTM B633 Type III SC1. Stainless steel options are often available upon request.
Thread Standards and Torque Specifications for 1 1 4 All Thread
Unistrut products adhere to the Unified Screw Thread standard (ANSI B1.1), utilizing coarse series (UNC) class 2 threads. This standardization ensures compatibility and consistent performance.
Applying the correct torque is crucial for achieving optimal clamping force and preventing damage. The following table provides recommended and maximum torque values for various bolt sizes:
| Bolt Size | 1/4″-20 | 5/16″-18 | 3/8″-16 | 1/2″-13 | 5/8″-11 | 3/4″-10 |
|---|---|---|---|---|---|---|
| Recommended Torque (Ft/Lbs (N•m)) | 6 (8) | 11 (15) | 19 (26) | 50 (68) | 100 (136) | 125 (170) |
| Maximum Torque (Ft/Lbs (N•m)) | 7 (9) | 15 (20) | 25 (34) | 70 (95) | 125 (170) | 135 (183) |
Dimensional Considerations
Unistrut products are primarily measured in imperial units (inches), with metric equivalents often provided in parentheses (millimeters). Metric dimensions are typically rounded to one decimal place. Standard metric dimensioned hardware is often available upon request.
Conclusion
Understanding the specifications of Unistrut channel nuts and bolts, especially regarding “1 1 4 all thread,” is essential for successful project implementation. By adhering to recommended torque values and utilizing the appropriate materials and finishes, you can ensure structural integrity and long-lasting performance in your applications. Always consult the manufacturer’s documentation for the most accurate and up-to-date information.
