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D4562-01 – Standard Test Method Technical Guide
🔬 Scope and Significance of the Test Method
This standard, D4562 – 01 (Reapproved 2019), covers the determination of the shear strength of curing liquid adhesives used for retaining cylindrical assemblies or for locking and sealing threaded fasteners. It provides data on the ability of an adhesive to withstand shearing forces, which is critical for evaluating its performance in applications such as bearing retention and threadlocking.
The test method involves bonding a metal pin inside a metal collar and determining the force required to shear the adhesive joint. This method is also suitable for determining the degree of cure and the effect of environmental exposure on shear strength. Values are stated in inch-pound units as the standard, with SI units provided for information.
💡 Technical Note: This method is specifically designed for anaerobic adhesives and sealants. It provides a direct measure of bond strength in a close-fitting cylindrical joint, closely simulating real-world conditions for retaining compounds.
📐 Specimen Geometry and Preparation
The test specimen consists of a metal pin and a metal collar. The most common material is steel conforming to Specification A108. A set of five specimens is prepared for each test. The geometric specifications are critical to the repeatability of the test.
| 🟦 Feature | 📏 Dimension (in.) | 📐 Dimension (mm) |
|---|---|---|
| Pin Diameter | 0.498 – 0.499 | 12.65 – 12.675 |
| Collar Inside Diameter | 0.500 – 0.501 | 12.7 – 12.725 |
| Collar Width | 0.435 – 0.439 | 11.05 – 11.15 |
| Diametrical Clearance | 0.001 – 0.003 | 0.025 – 0.075 |
| 🎯 Parameter | ⚡ Requirement |
|---|---|
| Surface Finish | 32 to 64 µin (0.8 to 1.6 µm) |
| Sample Size | 5 specimens per test |
All parts must be degreased according to Guide D2651 and stored in a low humidity atmosphere (20% relative humidity). To prevent oxidation from affecting the results, degreased specimens must be used within four days of cleaning. No priming or activation is allowed unless explicitly specified for the adhesive being tested.
⚠️ Critical Requirement: The diametrical clearance between the pin and collar is strictly limited to 0.001 to 0.003 in. (0.025 to 0.075 mm). Exceeding this clearance can lead to non-representative bondline thickness and invalid test results.
⚙️ Test Procedure and Key Measured Properties
Testing is performed using a Universal Test Machine capable of applying a controlled force to the assembled pin-and-collar specimen. The specimen is assembled using a specimen curing rack to ensure proper alignment during adhesive cure. The primary result is the force required to shear the adhesive joint.
The significance of this test method lies in its ability to provide reasonably accurate information on the shear strength of the adhesive. It is commonly used for quality control, product comparison, and evaluating the effects of environmental aging or different degrees of cure on the adhesive bond.
❓ Frequently Asked Questions
🔍 What is the main purpose of this test method?
The standard test method D4562 determines the shear strength of adhesives used for retaining cylindrical assemblies and locking threaded fasteners. It evaluates the adhesive’s ability to withstand shearing forces in a close-fitting metal joint.
💡 What is the specified clearance between the pin and collar?
The diametrical clearance must be between 0.001 and 0.003 inches (0.025 to 0.075 mm). This tight clearance is critical for accurately simulating the bondline of retaining compounds.
⚡ How many test specimens must be prepared for a valid test?
A set of five specimens is assembled for each individual test condition as detailed in Section 7.1 of the standard.
📌 What are the surface finish requirements for the pin and collar?
The contacting surfaces of both the pin and the collar must be finished to a surface roughness of 32 to 64 microinches (0.8 to 1.6 micrometers). This ensures consistent surface conditions for bonding.