LN 65150 is a Luftfahrt-Norm (LN) test method focused on double-shear testing of screws and bolts. It is typically referenced when a fastener, pin, or bolted feature needs a controlled shear-loading verification rather than a tensile proof load.
If you are trying to match a customer or drawing callout to the right test setup (especially when older LN designations are cited), contact our team with the exact designation and the fastener details so the fixture and loading configuration can be aligned to the requirement.
LN 65150:1977-11 — Testing of metallic materials; double shear test of screws and bolts
LN 65150:1977-11 describes a method used to apply shear loading to screws and bolts in a double-shear arrangement and evaluate performance under that loading mode.
This document has been published as a withdrawn standard, so applicability is driven by what your contract, drawing, or qualification plan explicitly calls out.
Quick definition
Standard type: Test method / mechanical test procedure for fasteners in double shear.
Primary intent: Generate a controlled double-shear loading condition on a screw or bolt and record the resulting load at defined events (as required by the cited document).
What this standard covers
LN 65150 is centered on shear testing of screws and bolts using a double-shear configuration. In practice, this means the fastener is loaded so shear is introduced across two shear planes, using a dedicated test fixture that supports the specimen and transfers load through the joint.
The exact specimen details (fastener type, thread engagement or shank condition in the shear plane, and any required conditioning) should be taken from the specific customer citation and the LN document edition referenced.
Why this standard matters in testing
Fasteners are often selected and qualified based on multiple loading modes. When a design expects the fastener to resist transverse loads, a shear-focused test helps separate shear behavior from pure axial tensile behavior.
For aerospace and other highly controlled supply chains, an LN method may be referenced in legacy drawings, qualification records, or customer-specific verification plans—making correct fixture selection and correct interpretation of the specified output critical for acceptance.
Common materials, product types, or applications covered
LN 65150 is commonly associated with metallic fasteners such as screws and bolts used in engineered assemblies where shear loading is a key design consideration.
Common product focus: Screws, bolts, and similar fastener forms used in structural or mechanically loaded joints.
Common use case: Qualification, comparison, or verification testing where a double-shear condition is specified by the controlling requirement.
Common test or verification workflow
A typical LN 65150 workflow is fixture-driven: the test lab prepares the fastener specimen and assembles it into a double-shear tool that defines alignment and loading geometry. The fixture is then loaded under controlled conditions while force and relevant observations are recorded.
Common workflow elements: Specimen identification and dimensional checks, assembly into a double-shear fixture, monotonic loading to the required endpoint, and reporting of required load values and specimen/fastener condition after test.
Equipment commonly used for this standard
LN 65150 typically points to a mechanical test system capable of applying controlled compressive or tensile force through a dedicated shear fixture. The fixture is the key accessory because it creates the double-shear condition and governs alignment.
Common equipment: Universal testing machine (UTM) with an appropriate force range and data acquisition, double-shear test fixture sized to the fastener geometry, and tooling to control alignment and minimize unintended bending.
Practical selection note: For quoting and setup, the fastener diameter range, expected failure load, and required fixture style usually drive frame capacity, load cell selection, and fixture design more than the base machine model.
How to read this designation or revision
Designation format: LN 65150:1977-11 indicates the LN document number and an edition date (November 1977) as published in the catalog record.
Status sensitivity: LN 65150:1977-11 has been listed as withdrawn (withdrawn date shown as February 2, 2024 in the catalog record). When a withdrawn standard is cited, the contract or drawing typically determines whether the withdrawn edition is still mandatory for that program.
Related standards, methods, or frameworks
Shear testing of fasteners is also covered in other national and international standards families. When LN 65150 is cited on legacy documentation, programs may also reference newer EN/ISO or customer specifications for fastener mechanical testing.
Recommendation: Match your testing plan to the exact cited document set (including any drawing notes, material/heat treatment requirements, and acceptance criteria) before selecting fixtures or comparing results across different methods.
Request equipment and fixture guidance
If you are selecting a UTM capacity and a double-shear fixture around a specific screw/bolt size and expected load range, you can request a detailed quote for a configuration that fits your lab’s force range, fixturing, and reporting needs.