Turnbuckles are used to provide length and tension 
adjustment of tie rods and hanger assemblies. They are widely used in structural steel bracing and pipe support applications.
Our forged turnbuckle bodies are manufactured to meet ASTM F1145, Type 1, Grade 1 Class B. They also meet the dimensions and load ratings shown in the American Institute of Steel Construction Inc. (AISC) Steel Construction Manual, 13th edition, page 15-16. Heat-treated carbon steel turnbuckle bodies and stainless steel turnbuckle bodies are available by special order.
Finish: Plain Steel (shot blasted after forging,) Hot Dip Galvanized & Zinc Electroplating.
Turnbuckles
| Thread Dia | Takeup Length | Nut Length | Overall Length | Body Width | Safe Working Load (lbs) | Weight Ea (lbs) |
|---|---|---|---|---|---|---|
| 3/8 | 6 | 5/8 | 7 1/4 | 1 1/32 | 1,200 | 0.4 |
| 1/2 | 6 | 3/4 | 7 1/2 | 1 5/16 | 2,200 | 0.8 |
| 1/2 | 12 | 3/4 | 13 1/2 | 1 5/16 | 2,200 | 1.3 |
| 5/8 | 6 | 15/16 | 7 7/8 | 1 17/32 | 3,500 | 1.0 |
| 5/8 | 12 | 15/16 | 13 7/8 | 1 17/32 | 3,500 | 1.7 |
| 3/4 | 6 | 1 1/8 | 8 1/4 | 1 25/32 | 5,200 | 1.5 |
| 3/4 | 12 | 1 1/8 | 14 1/4 | 1 25/32 | 5,200 | 2.5 |
| 7/8 | 6 | 1 5/16 | 8 5/8 | 1 7/8 | 7,200 | 1.6 |
| 7/8 | 12 | 1 5/16 | 14 5/8 | 1 7/8 | 7,200 | 3.4 |
| 1 | 6 | 1 3/8 | 8 3/4 | 2 1/32 | 10,000 | 2.0 |
| 1 | 12 | 1 1/2 | 15 | 2 1/32 | 10,000 | 4.6 |
| 1 1/8 | 6 | 1 3/4 | 9 1/2 | 2 17/32 | 15,200 | 3.8 |
| 1 1/4 | 6 | 1 3/4 | 9 1/2 | 2 17/32 | 15,200 | 3.5 |
| 1 3/8 | 6 | 1 7/8 | 9 3/4 | 2 3/4 | 21,400 | 6.0 |
| 1 1/2 | 6 | 1 7/8 | 9 3/4 | 3 1/32 | 21,400 | 5.8 |
| 1 5/8 | 6 | 2 7/16 | 10 3/4 | 3 9/16 | 27,600 | 9.8 |
| 1 3/4 | 6 | 2 7/16 | 10 3/4 | 3 9/16 | 27,600 | 9.5 |
| 1 7/8 | 6 | 2 9/16 | 11 1/8 | 4 | 34,500 | 13.4 |
| 2 | 6 | 2 9/16 | 11 1/8 | 4 | 34,500 | 13.0 |
| 2 1/4 | 6 | 3 3/8 | 13 1/2 | 4 5/8 | 48,000 | 23.5 |
| 2 1/2 | 6 | 3 3/8 | 13 1/2 | 5 | 60,000 | 23.5 |
Notes Regarding Strength: ASTM F1145 and Federal Specification FF-T-791b tabulate the recommended working loads and minimum breaking strengths for each size of turnbuckle body. Our turnbuckles meet the slightly higher safe working loads listed in the table which are taken from the AISC Manual of Steel Construction. These safe working loads are based on safety factor of 5:1, depending on the application of use the
From a thread strength standpoint, the nut area of carbon steel turnbuckle bodies forged to ASTM A668 Class C is roughly equivalent to an ASTM A563 Grade C heavy hex nut. For applications where high strength rods are specified and ASTM A563 Grade DH or ASTM A194 Grade 2H nuts would normally be used, sleeve nuts should be considered in place of turnbuckles. Sleeve nuts can be manufactured to meet all of the strength requirements of the ASTM nut specifications and will allow the full strength of the rod to be exploited.
