<\/div>\n
The UT measuring principle<\/h2>
The principle rests on the relationship between the elastic elongation of the bolt under load and the propagation time of the ultrasonic wave in the material: T = T\u2080 \u00b7 (1 + \u0394L\/L), where T is the time of flight after tightening, T\u2080 the time with the bolt unloaded, L the nominal length of the bolt and \u0394L the elastic elongation (related to the force F by Hooke’s law, F = E\u00b7A\u00b7\u0394L\/L). By measuring T before and after tightening, the axial force applied to the bolt is obtained. Measurement precision is typically better than 5% on the force (considerably better than torque control, which can be in error by 25-30% because of the variability of the friction coefficient). <\/p>
Operating procedure<\/h2>
The procedure involves: preliminary characterisation of the bolt material (elastic modulus, ultrasonic velocity \u2014 generally declared by the bolt manufacturer or determined on a master bolt); preparation of the bolt head surface (cleaning, with couplant where needed and with a marked reference point for repeatability); measurement of the initial time of flight T\u2080 (bolt unloaded, before tightening); tightening of the bolt according to the prescribed procedure; measurement of the time of flight T under load; and automatic calculation of the elongation and the force by the instrument. The measurement typically takes 30-60 seconds per bolt, with accuracy far above that of torque control. <\/p>
Instrument characteristics<\/h2>
Ultrasonic bolt tension monitors combine: a contact UT transducer, typical frequency 5-10 MHz; automatic couplant for stable coupling (gel applied to the bolt head); acquisition electronics with a high sampling rate (50-100 MS\/s) for precise time-of-flight measurement; an A-scan display for viewing the echo and diagnosing anomalies (internal defects, choosing the correct return echo); a bolt database with preloaded parameters (length, material, geometry, elastic modulus); automatic force calculation functions; and an archive giving traceability for every tightening operation.<\/p>
Critical applications<\/h2>
Applications include: tightening the stud bolts of wind turbines (tower flange studs, blade-to-hub studs); electrical power generators; high-pressure centrifugal pumps; chemical reactors and pressure exchangers; high-pressure piping in oil & gas; large water-main pipelines; the heads of large combustion engines; safety-system flanges in nuclear power stations; and geotechnical anchorages on major works. In all these cases, preload control by UT guarantees the integrity of the bolted joint throughout its operating life, with periodic checks during preventive maintenance. <\/p>
Reference standards<\/h2>
The reference standards are: ASTM F2168 (UT procedure for measuring bolt preload); ISO 16047 (determination of the friction coefficient of threads, complementary to UT); ASME PCC-1 (Pressure Vessel Component \u2014 guidelines for critical bolting); VDI 2230 (calculation of bolted joints). Bolts used with UT must be specially prepared (marked reference head, characterised material) in order to achieve the declared accuracies. Qualification of personnel as UT operators to ISO 9712 (level 1 minimum for preload measurement) is recommended. <\/p>","protected":false},"excerpt":{"rendered":"
UT instruments for measuring the elastic elongation of bolts and tie rods, as an alternative to torque control.<\/p>\n","protected":false},"author":157040980,"featured_media":35828,"parent":19409,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"bolt tension monitors","_yoast_wpseo_title":"Ultrasonic bolt tension monitors | RODER","_yoast_wpseo_metadesc":"Ultrasonic bolt tension monitors for measuring the preload and elongation of bolts and tie rods, as an alternative to the torque wrench.","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"footnotes":""},"class_list":["post-22854","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\n
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On\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Spessimetro digitale a ultrasuoni Dakota NDT ZX6 con datalogger per misure di spessore e corrosione","src":"https:\/\/i0.wp.com\/roder.it\/wp-content\/uploads\/2026\/07\/dakota_ndt-zx6-strumento_zx6dl_strumento_ad_ultrasuoni_per_misure_di_spessore_e_corrosione-web_image-680x680-1.webp?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/roder.it\/wp-content\/uploads\/2026\/07\/dakota_ndt-zx6-strumento_zx6dl_strumento_ad_ultrasuoni_per_misure_di_spessore_e_corrosione-web_image-680x680-1.webp?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/roder.it\/wp-content\/uploads\/2026\/07\/dakota_ndt-zx6-strumento_zx6dl_strumento_ad_ultrasuoni_per_misure_di_spessore_e_corrosione-web_image-680x680-1.webp?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":18680,"url":"https:\/\/roder.it\/en\/products\/bolt-tension-monitors\/","url_meta":{"origin":22854,"position":2},"title":"Bolt tension monitors","author":"GSM","date":"6 July 2026","format":false,"excerpt":"RODER \u00b7 Dakota NDT bolt tension monitors Dakota NDT bolt tension monitors The Dakota NDT ultrasonic bolt tension monitors measure fastener tension directly through elongation, eliminating the uncertainties of torque tightening. 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