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Summary of Contents for Skidmore-Wilhelm MZ-100
- Page 1 USER MANUAL MODEL MZ-100 BOLT TENSION CALIBRATOR 442 SOUTH GREEN ROAD SOUTH EUCLID, OHIO 44121 USA VOICE: 216-481-4774 FAX: 216-481-2427 www.skidmore-wilhelm.com...
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Page 3: Table Of Contents
TABLE OF CONTENTS Introduction ..................2 Typical Testing Applications ............2 Safety ..................2 Principle of Operation ..............3 Calibrator Setup & Operation ............4 Mounting the Calibrator ............. 4 Installing Optional Torque Reaction Kit ........5 Installing Adaptors ..............6 Installing the Fastener Assembly to be Tested ...... -
Page 4: Introduction
Introduction Thank you for purchasing the Skidmore-Wilhelm MZ-100 Bolt Tension Calibrator. Our improved lightweight design builds on over 50 years of industry leading experience in bolt tension measurement and calibration while maintaining the accuracy, reliability, ease of use and technical support that you have come to expect from Skidmore-Wilhelm. -
Page 5: Principle Of Operation
A specially calibrated gage measures the pressure and provides a reading of equivalent tensile force developed in the bolt. Figure 1, Typical Calibrator Cross-Section USER MANUAL, MODEL MZ-100... -
Page 6: Calibrator Setup & Operation
Figure 2. Caution: Do not over tighten wing screws. Figure 2, Typical Column Mounting © Copyright 2009 Skidmore-Wilhelm, Tungsten Capital Partners LLC All rights reserved including illustrations. Revision: 2/2010 Printed in USA... -
Page 7: Installing Optional Torque Reaction Kit
A torque reaction kit that mounts to the calibrator is required for all tightening tools with reaction arms. See Figure 3. Torque reaction kits can be purchased from Skidmore-Wilhelm. Please contact us to determine the proper kit for your application. -
Page 8: Installing Adaptors
See Figure 6. Make sure that the bushing is fully seated in the pocket. Figure 6, Installation of Adaptor Plate and Bushing © Copyright 2009 Skidmore-Wilhelm, Tungsten Capital Partners LLC All rights reserved including illustrations. Revision: 2/2010 Printed in USA... -
Page 9: Installing The Fastener Assembly To Be Tested
Install the washer and nut on plate side. See Figure 7. Snug tighten and you are ready for testing. Figure 7, Installation of Fastener Assembly to be Tested USER MANUAL, MODEL MZ-100... -
Page 10: How To Read The Gage
Please refer to the Structural Bolting Handbook or your project specifications to determine the proper bolt tension requirements. Figure 8, Example of How to Read Gage Dial © Copyright 2009 Skidmore-Wilhelm, Tungsten Capital Partners LLC All rights reserved including illustrations. Revision: 2/2010 Printed in USA... -
Page 11: Testing Procedures
This can cause pre-mature failure of the sealing system. Keep the calibrator clean and free of excess oil, grease and dirt, such as zinc dust from galvanized bolts. Only use cleaning solutions that are compatible with Nitrile rubber. USER MANUAL, MODEL MZ-100... -
Page 12: Special Testing Applications
In some cases standard sockets may not fit. Skidmore-Wilhelm can supply specially machined sockets. Please contact us with your application. Note: The above chart provides the minimum length bolt when using one F436 washer and a heavy hex structural nut. -
Page 13: Testing Longer Bolts
Testing Longer Bolts Bolts that are too long to be tested with standard adaptors can be tested using Spacers and/or Spacer Bushings. Skidmore-Wilhelm can supply standard and custom made Spacer Kits and Spacer Bushings. Please contact us with your application. -
Page 14: Testing Tension Control (Tc), "Twist-Off" Bolts
Contact Skidmore-Wilhelm, if the bolt head is rotating and you are not obtaining required tension. © Copyright 2009 Skidmore-Wilhelm, Tungsten Capital Partners LLC All rights reserved including illustrations. -
Page 15: Testing F959 Direct Tension Indicating (Dti) Washers
The four typical setup scenarios are shown in the following figures: Figure 15, Calibrator Cross-section Figure 16, Calibrator Cross-section DTI WASHER PLACED UNDER BOLT DTI WASHER PLACED UNDER THE NUT, HEAD, NUT IS TURNED TO TIGHTEN NUT IS TURNED TO TIGHTEN USER MANUAL, MODEL MZ-100... - Page 16 Spacer Bushings are recommended for long bolt/DTI assemblies. Turned down sockets may be required for Scenarios “A” and “D”. Please contact us with your application. © Copyright 2009 Skidmore-Wilhelm, Tungsten Capital Partners LLC All rights reserved including illustrations. Revision: 2/2010 Printed in USA...
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Page 17: Rotational Capacity (Rocap) Testing
Safety should always be your highest priority. The extra rotation and higher loads unique to ROCAP testing can result in broken bolts. Make sure to always follow your standard safety practices. USER MANUAL, MODEL MZ-100... -
Page 18: Calibration
Calibration All calibrators sold by Skidmore-Wilhelm are factory calibrated using precision compression presses, dead weights and/or proving rings that are traceable to NIST standards. A written Calibration Certificate is included with each unit. The calibrator should only be re-calibrated by a qualified technician using NIST traceable equipment. -
Page 19: Product Specifications
Measurement Accuracy: Within 1% of reading above 20,000 lbf Calibration: Traceable to NIST Bolt Diameter Range: ½” thru 1-1/4” Weight (Calibrator Only): 21 lbs (9.5 kg) Due to continual product improvements, specifications are subject to change. USER MANUAL, MODEL MZ-100... -
Page 20: Reference Information
National Institute of Standards & Technology (NIST) www.nist.gov Research Council on Structural Connections (RCSC) www.boltcouncil.org Steel Structures Technology Center, Inc. (SSTC) www.steelstructures.com © Copyright 2009 Skidmore-Wilhelm, Tungsten Capital Partners LLC All rights reserved including illustrations. Revision: 2/2010 Printed in USA...
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