ISO 27528 Axial Screw Withdrawal Resistance Test on Wood-Based Panels

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ISO 27528 Standard for Axial Screw Withdrawal Resistance Test on Wood-Based Panels | Compliant UTM Test Machine Guide

ISO 27528 Wood-based panels — Determination of resistance to axial withdrawal of screws is a globally unified international testing standard designed to quantify the maximum axial pull-out force required to fully extract embedded screws from engineered wood composite panels, fully supported by our professional screw withdrawal testing machine and dedicated pull-out fixture accessories.

This official standard defines two mandatory core test modes for complete screw holding capacity evaluation: face screw withdrawal testing and edge screw withdrawal testing. It delivers consistent, comparable benchmark data to assess screw retention performance for furniture, cabinetry, construction and joinery manufacturers.

ISO 27528 applies exclusively to wood composite substrates with a minimum thickness of 15 mm, covering widely used engineered wood materials including fibreboard, particleboard, oriented strand board (OSB), plywood and all other structural wood-based panels. Our universal material testing machine paired with ISO 27528 certified axial test jigs meets all axial load, specimen setup and force measurement rules specified in this standard for lab quality control, product R&D and third-party material inspection.

Keywords: ISO 27528 screw withdrawal tester, axial screw pull-out test machine, wood panel screw holding strength UTM, engineered wood fastener withdrawal testing equipment, face & edge screw withdrawal test, wood composite axial pull-out force measurement, 15mm wood panel screw retention test, OSB plywood fibreboard fastener test, furniture cabinet screw holding capacity inspection

Test Principle

The core principle is to measure the maximum axial tensile force needed to fully pull a screw out of either the flat surface (face) or vertical edge of conditioned wood-based panels under steadily increasing uniaxial load. The test ensures pulling force acts strictly along the screw’s central axis without bending torque, to capture the true fastener retention performance of the panel substrate.

Test Specimen Info

Item	Requirement
Panel thickness	≥ 15 mm (if thinner, glue multiple layers to reach 15 mm)
Specimen size	At least 75 mm × 50 mm
Edges	Clean, straight, at right angles to panel surfaces
Number per panel	5 (unless product spec says otherwise)
Sampling / cutting	Per ISO 16999
Conditioning	(20 ± 2) °C, (65 ± 5)% RH to constant mass (≤ 0.1% mass change over 24 h); test within 1 h after removal
Screws	Common-use or application-specific steel screws, new, rust/oil/grease-free, undamaged.

Test Equipment stipulated in ISO 27528 Screw Withdrawal Test in Wood panels

Universal Testing Machine

Capable of continuous increasing axial load on screw heads via a stirrup fixture, with simultaneous rigid restraint of test specimens.

Load measurement accuracy must reach ±1% of the maximum recorded load.

Screw withdrawal test fixture

Screw holding grip:

Clamps the screw shank to transmit pure axial pulling force, eliminating lateral offset or rotational moment that distorts test results.

ISO 27528 screw withdrawal resistance test of wood-based panels

Metal restraining jig:

Equipped with a central slot to fix test pieces and align extraction force along the screw axis.

Critical rule: no jig component can sit closer to the screw than three times the screw’s outer diameter to avoid localized stress interference.

ISO 27528 screw withdrawal resistance test of wood-based panels

Key Test Parameters & Mandatory Test Stipulations

Pilot hole specification

Drill holes perpendicular to test surfaces/edges. Hole diameter prioritizes panel manufacturer guidance; if unavailable, follow screw maker recommendations; if neither exists, select the drill size one step smaller than the screw root diameter. Pilot hole length exceeds the target screw embedment depth.

Face withdrawal embedment depth: (11 ± 0.5) mm of full thread buried into panel face centre.

Edge withdrawal embedment depth: (15 ± 0.5) mm of full thread buried into midpoint of adjacent vertical edges; two screws per edge specimen.

Fixture clearance rule: Restraint parts maintain ≥3× screw diameter clearance around the embedded screw segment.

Force alignment rule: Test surface must be perpendicular to the axial pulling load direction.

Step-by-Step General Test Procedures of ISO 27528

Step 1: Specimen Preparation After Conditioning

Face test: Drill one perpendicular pilot hole at the geometric centre of the specimen flat face, drive one test screw to hit the 11±0.5 mm full-thread embedment depth.

Edge test: Drill two perpendicular pilot holes at the midpoint of two adjacent vertical edges, install two screws each embedded to 15±0.5 mm full thread depth. Record pilot hole diameter and length.

Step 2: Specimen Mounting & Positioning

Secure the conditioned specimen into the metal jig to meet two mandatory positioning rules:

a) No jig support within three times the screw diameter of the embedded screw perimeter;

b) The tested surface is perfectly perpendicular to the pulling load axis. Face specimens mount with the screw pointing upward; edge specimens follow the jig layout.

Step 3: Load Application & Data Recording

Mount the screw head into the testing machine’s stirrup grip, apply gradually increasing axial tensile load along the screw central axis until the screw fully pulls out from the panel. Capture the peak maximum load value during extraction.

Step 4: Result Calculation & Reporting

Calculate average maximum withdrawal force from replicate specimens, document all test variables (specimen size, conditioning cycle, screw type, pilot hole dimensions, embedment depth, peak loads).

Related Test Standard:

ASTM D1761	Standard Test Methods for Mechanical Fasteners in Wood and Wood-Based Materials
EN 320	Particleboards and fibreboards - Determination of resistance to axial withdrawal of screws
EN 1382	Timber Structures - Test methods - Withdrawal capacity of timber fasteners
GOST R 57176	Timber structures. Test methods for withdrawal capacity of timber fasteners
BS 6948	Methods of test for mechanically fastened joints in timber and wood-based materials
GB/T 17657	Test methods of evaluating the properties of wood-based panels (equivalent to ASTM D1037 domestic implementation standard)
ASTM D143	Small Clear Timber Specimen Mechanical Test Methods
ASME B18.6.1	Inch-Series Wood Screw Specification
ASTM D1037	Test Methods for Wood-Base Fiber and Particle Panel Materials

Industry Application Fields

This test is widely applied across the wood composite manufacturing and downstream utilization sectors:

Furniture & cabinet manufacturing: Evaluate screw connection durability for wardrobes, desks, kitchen cabinets and flat-pack furniture.

Construction & structural joinery: Test OSB, particleboard and plywood used for wall panels, subflooring, roof sheathing and interior partition boards.

Wood panel production quality control: Factory incoming inspection, finished product performance verification, new panel formulation R&D comparison.

Third-party material certification: Global compliance testing for wood panel products sold in international markets, providing standardized performance data for technical datasheets.

Why This Test Matters for the Material

Fastener reliability – Screw withdrawal strength directly predicts whether a joint will fail in service (e.g., cabinet hinge pull-out, furniture load, wall-panel fixing).

Material comparison – Allows objective comparison between panel types (plywood vs. MDF vs. OSB) and between densities/thicknesses.

Screw–panel compatibility – Different screws (coarse/fine thread, coating, diameter) behave differently; the test lets manufacturers matchscrew to panel.

Quality control – Panel producers can verify batch consistency against product specs.Design input – Engineers use withdrawal values for spacing, edge distances, and load calculations in furniture/construction design.

In short: without this test, you're guessing whether a screw will stay put — and in furniture or building elements, screw pull-out is one of the most common modes of connection failure.

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

Screw withdrawal test fixture, also widely named screw pull-out jig execute the accurate maximum screw withdrawal resistance (screw holding strength) test results for furniture, construction timber and engineered wood labs. Conform with ASTM D1761, ISO 27528 stabdard,

Q1: What is the core purpose of the ISO 27528 test?

A1: This standard test measures the maximum axial tensile force required to pull a screw out from wood-based panels (face or edge extraction). It quantifies the screw holding capacity of panels to evaluate connection reliability for furniture, cabinetry and construction use. It provides a globally unified test method for fastener retention performance of engineered wood panels ≥15 mm thick.

Q2: Why is the ISO 27528 screw withdrawal test important for wood-based panel materials?

A2: Screw pull-out strength is a critical mechanical property determining joint durability. Poor withdrawal resistance causes loose joints, wobbling furniture or structural failure in building assemblies.

It enables fair comparison between different panel types (MDF, particleboard, OSB, plywood) for material selection in product design.

It creates a uniform international testing benchmark, eliminating regional test differences for cross-border trade, product certification and tender compliance.

Manufacturers use test data to optimize board density, resin formulation and production processes to improve fastener holding performance.

Moisture-variant testing (standard climate, water soaking) predicts long-term service performance under different humidity environments.

It serves as a mandatory compliance test referenced by most national wood panel product standards for market access.

Q3: Which panels are covered by ISO 27528? Are there thickness limits?

A3: All common wood-based panels including particleboard, fibreboard (MDF/HDF), oriented strand board (OSB), plywood and composite wood panels. The standard only applies to panels with a thickness of 15 mm or greater. Thinner panels must be laminated to reach 15 mm minimum thickness before testing.

Q4: What are the two main screw withdrawal test modes specified in the standard?

A4: Face withdrawal: Screw embedded vertically into the flat panel surface, with a full thread embedment depth of 11 ± 0.5 mm.

Edge withdrawal: Screw embedded into the vertical edge of the panel, with a full thread embedment depth of 15 ± 0.5 mm. Tapered screw tip sections are excluded when calculating embedment depth.

Q5: What screws should be used for ISO 27528 testing?

A5: General industrial testing: New clean steel screws free of rust, oil, grease, thread damage or deformation; these should match screws intended for actual end-use applications. Full screw dimensions must be recorded in the test report.

Reference standard testing: Mandatory medium reference screws defined in normative Annex A, following dimensional tolerances from ISO 2768-1.

Screw length must be long enough to meet the required embedment depth plus extra exposed shank for fixture clamping.

Q6: How to determine the correct pilot hole diameter before inserting test screws?

A6: Follow this priority sequence:

First adopt the pilot hole size recommended by the wood panel manufacturer.

If unavailable, follow the screw manufacturer’s drilling guidance.

If no guidance from either party, select the drill bit size that is one step smaller than the screw root diameter.

All pilot hole dimensions (diameter and length) must be recorded in the final test report.

Q7: Why must we avoid contact between the jig and the panel near the embedded screw?

A7: The standard requires a minimum clearance of three times the screw outer diameter around the screw position. Close jig contact creates localized stress concentration, artificially raising or lowering the measured pull-out force and producing inaccurate, non-reproducible test results.

Q8: How many replicate specimens are needed for a valid ISO 27528 test result?

A8: A minimum of 5 replicate test pieces per panel grade is required unless the corresponding product specification defines a different sampling quantity. Multiple replicates reduce data deviation and ensure statistical reliability of average withdrawal strength.

Q9: What is the difference between face withdrawal and edge withdrawal test results?

A9: Edge withdrawal strength is usually lower than face withdrawal strength for most wood panels. Panel edges have less uniform fibre/compression density, creating weaker screw holding performance. Both tests are required to fully evaluate real-world assembly scenarios where screws are installed on either flat surfaces or board edges.

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