Skidmore-Wilhelm invented the bolt testing unit as a way to measure bolt tension. Use of bolts in steel structures was exploding and engineers were trying to understand the relationship of torque and tension in that bolted joint. Today, the Skidmore is the standard for bolt testing applications. Commonly used in structural and DOT projects – units provide calibrated and consistent measurements to help you apply the correct amount of tension to every bolt that you torque or tension.
Unit Model | Bolt Capacities In. | Load Capacity |
Most Common Skidmore Units | ||
MZ | ½” to 1.1/4” | 126,000 LBF |
HS | ¾” to 1.1/2” | 170,000 LBF |
Other Units | ||
K | 1.1/4” to 2.1/2” | 225,000 or 450,000 LBF |
J | 5/8” and 7/8” | 30,000 LBF |
P | 3/8” | 15,000 LBF |
S | #6 to ¼” | 3MM to 6MM | TBU |
TENSION TESTER MODEL | BOLT ASSEMBLY PART NO. | TEST BOLT SIZE | HEX SOCKET (inch) | MAXIMUM “NORM” (lb-f) | TORQUE “FACTOR” | MAX. TORQUE (Ft*lb-f) | MAX. TORQUE (N-m) | |
S | S-105 | 5/16 | 3/8 | 5000 | 250 | 20 | 27 | |
J | J-110 | 5/8 | 9/16 | 20000 | 150 | 130 | 176 | |
J | J-114 | 7/8 | 7/8 | 30000 | 105 | 300 | 407 | |
RL | R-112 | 3/4 | 1-1/4 | 40000 | 120 | 350 | 475 | |
RL | R-116 | 1 | 1-1/2 | 70000 | 90 | 800 | 1085 | |
RL | R-120 | 1-1/4 | 2 | 110000 | 70 | 1500 | 2034 | |
H | H-112 | 3/4 | 1-1/4 | 40000 | 120 | 350 | 475 | |
H | H-116 | 1 | 1-1/2 | 70000 | 90 | 800 | 1085 | |
H | H-120 | 1-1/4 | 2 | 110000 | 70 | 1500 | 2034 | |
H | H-124 | 1-1/2 | 2-3/8 | 170000 | 60 | 2800 | 3797 | |
K | K-120 | 1-1/4 | 2 | 110000 | 70 | 1500 | 2034 | |
K | K-124 | 1-1/2 | 2-3/8 | 170000 | 60 | 2800 | 3797 | |
K | K-128 | 1-3/4 | 2-3/4 | 225000 | 50 | 4500 | 6102 | |
K | K-132 | 2 | 3-1/8 | 225000 | 45 | 5000 | 6780 | |
K | K-140 | 2-1/2 | 3-7/8 | 225000 | 35 | 6400 | 8678 |
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