is less uncertainty with the torque-tension relationship 3. The torque coefficients for dry silver-plated CRES inserts were higher than for phosphor bronze  inserts. In addition, the dispersion was also higher for the dry silver-plated CRES inserts. This  was more pronounced for larger size fasteners and goes counter to the assumption that silver plating will act as an effective lubricant. For lubricated samples there was little difference. 4. The torque coefficients for smaller fasteners were found to be higher than those specified by the  Goddard Torque Guideline. In this document the lubricated torque coefficient is specified at 0.15  and dry coefficient at 0.2. Based on the small fastener test results, these values were revised to a wet coefficient of 0.18 and dry coefficient of 0.37. Also, based on un-cleaned test results, a  coefficient of 0.25 was specified for dry un-cleaned samples. Arathane Testing The purpose of this testing was to determine the differences in torque coefficient when applying Arathane  5753 thread locking compound versus Braycote 601EF lubricant to the fasteners at installation. The use  of Arathane as a secondary locking feature was proposed when locking inserts were worn due to repeated torque application cycles. The test sequence was as follows: /g120First, the locking phosphor bronze inserts were worn by (10) torque application cycles to 65%  yield. This was performed for three different size inserts, #8 (4.2 mm), #10 (4.8 mm) and ¼ inch (6.3 mm) with Braycote lubrication applied to the fastener threads and washer to bolt head  bearing surface for first cycles only. /g120During each of the (10) torque application cycles, torque-tension measurements were recorded.  /g120After ten cycles, the worn insert was thoroughly cleaned and a new fastener and washer were installed with Arathane applied to threads and washer to bolt head bearing surface.   Also investigated was the case where a new fastener is installed into a new locking phosphor bronze  insert with both Arathane and Braycote. Two different cleaning agents, (IPA and HFE7100) for removal of the Braycote lubricant from worn inserts, were also investigated. Arathane Test Results and Conclusions The average torque coefficients (Kmean) were determined by two methods as follows: 1. First method was to use the average total torque at the target preload of 65% fastener yield. 2. The second more involved method was to perform a linear regression curve fit of actual test data and determine the torque coefficient from the slope of the linear regression curve. As shown in the Table 2, there was little difference between the two methods for the various data sets.    Table 2. Torque Coefficient Comparison: Average vs Linear Regression Method Configuration Ave Torque Coeff  @ 65%Ave Torque Coeff Linear Regression  (LR)% Difference of Methods Worn #8 Braycote 0.145 0.137 5.4 Worn #8 Arathane 0.284 0.277 2.6 Worn #10 Braycote 0.175 0.168 4.2 Worn #10 Arathane 0.314 0.312 0.6 Worn 1/4” Braycote 0.227 0.219 3.5 Worn 1/4” Arathane 0.316 0.321 1.8 A comparison of torque coefficients for use of Arathane and Braycote is shown in Figure 6. The cyclic  data was combined into one data set for each fastener/insert size to generate this comparison data plot. 236