ASTM D5648 Torque-Tension Relationship of Adhesives on Threaded Fasteners
The ASTM D5648 test describes the method to measure torque-tension relationships (lubricity) of adhesives used in fastener thread locking and sealing applications. The ASTM D5648 result is expressed as the K value which is the nut factor and is dimensionless.
Average 30% Cost Savings
100% Confidentiality Guarantee
Free, No-obligation Consultation
100% Customer Satisfaction
TRUSTED BY ENGINEERS FROM
ASTM D5648 Torque-Tension Relationship of Adhesives on Threaded Fasteners
The ASTM D5648 test describes the method to measure torque-tension relationships (lubricity) of adhesives used in fastener thread locking and sealing applications. The ASTM D5648 result is expressed as the K value which is the nut factor and is dimensionless.
Scope:
The standard ASTM D5648 describes the test method to determine the torque-tension relationship of adhesives that are applied onto threaded fasteners, for locking and sealing. When a threaded fastener such as a nut and bolt or screw is tightened onto a load, clamping forces on the load increases. The reaction from the clamped load increases the tension acting on the fastener, making it stretch. The torque needed to tighten the threaded fastener onto the load also changes due to increasing tension, as the clamped load is squeezed tight. To ensure the correct tightening of joints held together by threaded fasteners, it is important to understand the relationship between applied torque and the resultant fastener tension. It is then possible to either control the torque needed to develop the desired level of fastener tension or control tension to stay within a torque range. The torque-tension relationship is very sensitive to friction.
The ASTM D5648 test is important in applications where thread locking and sealing adhesives are applied on threads of fasteners, to prevent their loosening in service. The ASTM D5648 test involves load testing bolt, nut, and washer assemblies, after adhesive application on the threaded surfaces. The torque-tension measurements during nut tightening establish their relationship for various sample and adhesive combinations.
Procedure:
The ASTM D5648 procedure is conducted using a test bolt, test washer, and test nut loosely fitted into a test fixture. The hardened test washer is placed over the exposed end of the bolt contacting the fixture. Initially, the nut is hand tightened till it contacts the hardened washer. Accurate tension and torque measuring devices are needed to measure bolt tension and applied torque. The nut is then slowly tightened, at a speed not exceeding 30 r/min, to reach a pre-set tension. Upon tightening and increasing the clamp load, the measured tension and applied torque are measured till the desired tension is reached. It is important to stay below the yield strength of the bolt material.
Specimen size:
The ASTM D5648 prescribes the following test specimen sizes, though the supplier and user can agree on other sizes and materials:
Bolts: Phosphate and oil treated, at least 1½ inch long with a hexagonal head, 3/8 inch size, 16 threads per inch Unified National Coarse thread series (3/8 by 16 UNC) and grade 5 as per SAE J429.
Steel Nuts: Type II, Style 4, nominally 21/64 inch thick as per Fed. Spec FF-N-836
Hardened Washers: conforming to Table 1 of SAE J174.
Result:
The result is expressed as the K value, which is the nut factor in the basic elastic torque-tension equation and is dimensionless.
Conclusion:
The standard ASTM D5648 describes the test method to determine the torque-tension relationship of adhesives that are applied onto threaded fasteners, for locking and sealing.
ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 test is a standard test method for the analysis of sulfochromate etch solutions used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
ASTM G65 measures the resistance of metallic materials to abrasion using the dry sand/rubber wheel apparatus. The quality, durability, and toughness of the sample are determined using this test. Metallic materials are ranked in their resistance to scratching abrasion under a controlled environment.
ASTM E2141 test methods provide accelerated aging and monitoring of the performance of time-dependent electrochromic devices (ECD) integrated in insulating glass units (IGU). This test helps to understand the relative serviceability of electrochromic glazings applied on ECD.
ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.
Send us a request
Process for testing
STEP 01
You share material and testing requirements with us
STEP 02
You ship your sample to us or arrange for us to pick it up.
STEP 03
We deliver the test report to your email.
Just share your testing requirements and leave the rest on us!
Free, no-obligation consultation
Guaranteed confidentiality
Quick turnaround time
Hassle-free process
Let us combine our capabilities to achieve success!!