EN 1382 Test methods for withdrawal strength of timber fasteners

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EN 1382 Timber Standard | Axial Fastener Pull-Out Resistance Test for Structural Timber | Our Compliant Testing Equipment

EN 1382 (Timber Structures – Test methods – Withdrawal capacity of timber fasteners) is the authoritative European standard that our factory’s universal material testing machine and matched pull-out fixtures fully comply with. This norm lays out standardized laboratory procedures to measure the maximum axial pull-out resistance of mechanical fasteners embedded inside structural solid timber substrates.

The test scope covers three core fastener types: nails, wood screws and staples installed in solid timber, glued laminated timber (glulam), laminated veneer lumber (LVL) and cross-laminated timber (CLT). Distinct from EN 320 and ISO 27528 which target engineered wood composite panels like particleboard and MDF, EN 1382 exclusively focuses on solid structural timber for construction applications.

Accurate test data generated following EN 1382 delivers reliable benchmark values for structural timber engineering design and full Eurocode building compliance. Our custom-built axial withdrawal testing system ensures pure axial tension loading without eccentric force interference, producing repeatable pull-out strength results for structural timber manufacturers, civil engineering labs, third-party construction material inspection facilities and Eurocode-certified testing institutes across Europe.

EN 1382 Test methods for withdrawal strength of timber fasteners

Test Principle

The fastener is driven into a timber test piece (perpendicular or parallel to grain, depending on configuration), conditioned, then axially pulled out along the fastener axis while measuring F_max. The withdrawal parameter fₐₓ is then calculated by normalising F_maxto fastener diameter × penetration depth.

Unlike EN 320 / ISO 27528 which report F_max in N (or N/mm for thin EN 320), EN 1382's primary output is fₐₓ [N/mm²] — a material-level parameter, not just a fastener-level number. This is because timber withdrawal depends heavily on dand l_d, so normalising makes results comparable across fastener sizes.

Test Specimen Info

1, Covered Timber MaterialsSolid sawn timber, glued laminated timber (glulam), Laminated Veneer Lumber (LVL), Cross-Laminated Timber (CLT). This standard does not apply to particleboard, MDF or OSB (those use EN 320 or ISO 27528).

2, Permitted Fastener TypesRound wire nails, wood construction screws, U-shaped staples (definitions and dimensions shown in Standard Figure 1).

3, Specimen Geometric Mandatory DimensionsTwo distinct specimen sizing rules based on grain orientation:

(1) Fastener perpendicular to grain

Minimum specimen length in fastener insertion direction: l + 5d

All surrounding clearances ≥ 5d for nails/screws; ≥ 2a / ≥3a for staples

Fastener penetration depth fixed to 8d

Staples tested at crown angle a_crn=30^o relative to grain

(2) Fastener parallel to grain (end-grain insertion)

Minimum specimen length in insertion direction: 2ld + 5d

Fastener penetration depth range: 8d to 20d

Surrounding clearances match staple/nail dimensional rules.

Fasteners are inserted following standard construction practice; pre-drilling pilot holes is permitted as specified by engineering or fastener manufacturer guidance. Insertion shall be random relative to timber growth rings for solid timber; LVL fastener insertion is perpendicular to veneer layers.

Test Equipment required for EN 1382 Screw Withdrawal Test of timber:

Universal Testing Machine	Capable of continuous increasing axial load, precise peak load measurement, controlled constant crosshead speed, rigid specimen restraint, and displacement recording for load-slip curves.
Screw withdrawal test fixture	Separate grips for single screws/nails and two-legged staples to evenly distribute axial force along the fastener’s central axis without side torque.
Metal specimen restraining support frame	Designed to meet mandatory clearance rules: supports shall be no closer than 3d (3×fastener diameter) for nails/screws, or a (staple crown width) for staples around the embedded fastener to avoid artificial stress concentration.
Climate conditioning chamber	To stabilise timber specimens to constant mass before testing, controlling temperature and relative humidity.

Key Test Parameters & Mandatory Test Stipulations

Support clearance limit: ≥3d from fastener axis for screws/nails; ≥a for staples

Penetration depth: Perpendicular grain = fixed 8d; parallel grain = 8d ~ 20d adjustable range

Staple test angle: a_crn=30^o between staple crown and timber grain

Calculation formula: Standardised f_ax withdrawal strength for structural design

Loading protocol: Follow EN 26891’s monotonic increasing axial load until complete fastener pull-out failure.

EN 1382 Test methods for withdrawal strength of timber fasteners

General Test Procedures of EN 1382:

1: Specimen ConditioningPlace timber test blocks in climate chamber until constant mass is confirmed via two 6-hour apart weight readings with ≤0.1% mass variance. Record final moisture content of each specimen.

2: Fastener Installation & Penetration MeasurementDrill pilot holes if required, drive nails/screws/staples into timber to target penetration depth (8d for perpendicular grain; 8–20d for parallel end grain). Measure and record exact effective embedded depth ld for each fastener.

3: Specimen Mounting on Test MachineSecure the timber block into the metal support jig, strictly maintaining the minimum 3d / a clearance between jig supports and fastener axis. Attach the pulling fixture to the fastener head/staple crown to ensure load acts purely along the fastener’s central axis.

4: Axial Load ApplicationApply steadily increasing tensile axial load following the loading procedure defined in EN 26891 until the fastener fully withdraws from the timber substrate. Record the maximum peak force F_max achieved during the test.

5: Result Calculation & DocumentationCalculate the characteristic axial withdrawal strength f_ax using the standard formula for screws/nails or staples. Record all individual test data, timber properties, fastener specifications and conditioning parameters for the formal test report.

Related Test Standard:

ASTM D1761	Standard Test Methods for Mechanical Fasteners in Wood and Wood-Based Materials
ISO 27528	Wood-based panels - Determination of resistance to axial withdrawal of screws
EN 320	Particleboards and fibreboards - Determination of resistance to axial withdrawal of screws
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

European Mass Timber Construction Industry

Light-frame timber housing, CLT multi-storey buildings, glulam beam frames, roof trusses, timber bridges – core standard for structural joint safety verification.

Structural Timber Engineering & Design Firms

Generates withdrawal strength data for Eurocode 5 timber structure design calculations, used to size fastener layouts and calculate joint load capacities.

Timber & Fastener Manufacturers R&D & QC

Solid timber mills, screw/nail/staple producers, glulam/CLT factories for batch performance testing and new product development.

Third-Party EU Structural Testing & Certification Laboratories

Mandatory test for CE marking of structural timber components and construction fasteners placed on the EEA market.

Timber Research & Academic Institutions

Comparative testing of timber species, fastener types, moisture impact and long-term creep withdrawal performance.

Keywords: EN 1382 fastener pull-out testing machine, structural timber axial withdrawal tester, glulam CLT LVL screw pull-out UTM, Eurocode timber fastener resistance test equipment, axial pull-out resistance of timber fasteners, solid timber screw nail staple withdrawal test, EN 1382 compliant test fixture for structural lumber, Eurocode timber engineering design test machine, CLT glulam LVL fastener holding strength measurement

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 main objective of EN 1382:2016?

A1: EN 1382 is a harmonized European structural timber standard that specifies a uniform test method to measure the axial withdrawal pull-out capacity of nails, wood screws and staples embedded in solid structural timber, glulam, LVL and CLT. It generates standardized peak pull-out force data to calculate characteristic axial withdrawal strength f_ax, which is mandatory input for Eurocode 5 structural timber joint design. Two test orientations are covered: fastener perpendicular to timber grain and fastener parallel to timber end grain.

Q2: What timber materials and fasteners does EN 1382 cover? Which materials are excluded?

A2:Covered substrates: Solid sawn timber, glued laminated timber (glulam), Laminated Veneer Lumber (LVL), Cross-Laminated Timber (CLT).

Covered fasteners: Round wire nails, construction wood screws, U-shaped staples.

Excluded materials: Particleboard, MDF, OSB, plywood and other man-made wood composite panels. These materials use EN 320 or ISO 27528 screw withdrawal tests instead.

Q3: What is the core difference between EN 1382 and EN 320 / ISO 27528?

A3:Scope difference: EN 1382 applies to solid structural timber for building construction; EN 320 and ISO 27528 only apply to engineered wood panels for furniture production.

Fastener range: EN 1382 tests nails, screws and staples; EN 320 only uses a fixed ST4.2 reference screw, ISO 27528 only tests screws.

Engineering purpose: EN 1382 outputs structural design strength values for Eurocode 5; EN 320 / ISO 27528 only provide quality control indicators for furniture panels.

Grain consideration: EN 1382 differentiates pull-out performance parallel vs perpendicular to timber grain; panel standards ignore grain direction entirely.

Q4: Why is EN 1382 extremely important for European timber construction?

A4:Mandatory Eurocode 5 design basis: The axial withdrawal strength f_ax calculated from EN 1382 test results is the key parameter engineers use to calculate safe load capacity of timber fastener joints in all EU timber buildings.

CE marking legal requirement: Structural timber, glulam, CLT and construction fasteners sold in the EEA need EN 1382 test reports to comply with Construction Products Regulation (CPR) and obtain CE marking.

Prevent structural failure: Fastener pull-out is one of the most common causes of timber frame collapse under wind, snow and permanent loads; the test quantifies real holding capacity to avoid under-designed fastener layouts.

Unified cross-border testing benchmark: All EU member states follow identical specimen geometry, loading and calculation rules, eliminating inconsistent regional test results for cross-border material trade.

Evaluate environmental degradation: Variable moisture conditioning simulates real building humidity conditions, allowing assessment of long-term strength loss in damp service environments.

Guide product optimization: Timber mills adjust drying and grading processes; fastener manufacturers optimize thread, diameter and coating based on pull-out test data to improve joint performance.

Q5: What are the two main test configurations defined in EN 1382?

A5:Fastener axis perpendicular to grain (face insertion): The most common installation method in timber construction; fastener penetration depth fixed at 8 times fastener diameter (8d). Staples are tested at a crown angle of 30° relative to grain.

Fastener axis parallel to grain (end-grain insertion): Fastener driven into timber end grain; penetration depth ranges from 8d to 20d. Pull-out strength is always lower than perpendicular grain installation, representing a critical weak joint condition for structural design.

Q6: What penetration depth requirements apply for fasteners in each test configuration?

A6: Perpendicular to grain: Fasteners must be embedded to a fixed depth of 8× fastener diameter (8d).

Parallel to end grain: Fastener penetration depth shall be between 8d and 20d, adjustable based on engineering research or product testing objectives.

Q7: What happens if structural timber fails EN 1382 withdrawal testing?

A7: The product cannot obtain valid CE marking and cannot be legally supplied to EU construction markets.

Structural engineers cannot approve building designs using this timber, as joint load capacity calculations will not meet Eurocode 5 safety thresholds.

Timber manufacturers must adjust production processes (drying, grading, preservative treatment) and re-test to achieve compliant withdrawal strength values.

Fastener suppliers may need to redesign screw/nail thread patterns or surface coatings to improve pull-out resistance in low-performance timber grades.

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