Skidmore-Wilhelm Bolt Testers

1/4"" to 2.1/2" Bolt Testing Capacities | Up to 450,000 Lb (450kips) Preload Capacities

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.

  • Interchangeable plates and bushing to accommodate multiple bolt sizes in one unit
  • Compatible with hydraulic, battery, pneumatic, and manual wrenches with the Skidmore reaction kit
  • FPT Carries a large rental fleet of Skidmore units
  • Calibrated to within 1%
  • T-Wing mounting screws
  • Can be used with TC Bolts
  • Compatible with Hydraulic Tensioners
  • Compatible with Standard DTI and DTI Squirt Washers

Skidmore-Wilhelm Unit Models

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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