Precision Accessories for Uncompromising Accuracy.

Universal Parallel Wedge Grips

Sliding wedge action increases grip force in proportion to the applied load.

Standard faces accept flat specimens upto 25 mm wide and 5 mm thick, or a rigid round bar of 8 mm, in a general purpose fixture engineered for heavier work. Interchangeable jaw faces for round specimens are available, matching the contact surface to the specimen geometry.

• Self-tightening sliding wedge action
• Flat specimens upto 25 mm wide, 5 mm thick
• Or a rigid round bar of 8 mm
• Interchangeable faces for round specimens

Manually Operated Heavy Duty Wedge Grips

Interchangeable grip faces adapt the circular housing to the material under test.

This general purpose sliding wedge is self-tightening under tension and engineered for heavier manual work, with testing capacities from 30 kN to 100 kN. Jaw inserts with different contact surfaces may be chosen to alter the contact made with the specimen.

• Testing capacities 30 kN to 100 kN
• Self-tightening sliding wedge action
• Built for heavier loads

25mm Square Vice Action Grip

Rubber-coated jaw faces provide secure, non-destructive holding of flat sheet specimens.

The fixture is a 25 mm square vice action grip with a maximum opening of 3 mm, closed manually against the specimen. It is applied to paper, thin plastic film, textiles, waxed paper and film containing slip additive.

• 25 mm square vice action grip
• Flat rubber-coated jaw faces
• Maximum opening 3 mm
• Paper, thin plastic film, textiles
• Handles waxed paper and slip additive film

100mm Wide Vice Action Grips

Broad, full-width clamping distributes grip stress evenly across the specimen under tension.

Jaw faces 100 mm wide and 50 mm long are supplied in interchangeable flat and corrugated forms, so the contact surface can be matched to paper, thin plastic films or textiles. A single body accepts either set as the material changes.

• Jaw faces 100 mm wide, 50 mm long
• Interchangeable flat and corrugated faces
• Vice action clamping
• Paper, thin plastic films, textiles

Eccentric Roller Grips

Eccentricity in the roller converts tensile force directly into gripping pressure.

Cross-hatched serration closes against a flat back plate, securing sheet materials, polymers and some rubbers. Two sizes cover flat and dumb-bell specimens upto 25 mm wide and 5 mm thick, and dumb-bell samples upto 50 mm wide and 6 mm thick.

• Self-tightening eccentric roller action
• Cross-hatched serrated roller face
• Upto 25 mm wide and 5 mm thick
• 50 mm size: upto 50 mm wide, 6 mm thick
• Sheet materials, polymers, some rubbers

Chuck Grips

A machined quick-release slot permits rapid loading and unloading of each specimen.

Manufactured for small round metal dumb-bell specimens, the grip suits the miniature Metric Type B′ size. Where a specimen falls outside the published range, tooling is designed to the customer's geometry.

• For small round metal dumb-bells
• Quick load and release slot machined in
• Suits Metric Type B′ miniature dumb-bells

Quick Release Bollard Grip

Wrapping the specimen spreads grip stress over the full contact arc.

Wrapping the specimen before it is clamped prevents grip breaks — the failure that happens at the jaw rather than in the material — by distributing grip stress around the bollard's circumference. Yarn, wool, man-made textile fibres, threads and wires are wound on before the free end is clamped, and release is immediate at the end of each test.

• Quick release for fast reloading
• Prevents grip breaks at the jaw
• Grip stress distributed by wrap contact
• For yarn, wool and man-made fibres
• Also suits other threads and wires

Split Capstan Grips

Constant closing pressure across both halves prevents progressive slippage under rising load.

Rope, wire, twine, cord and yarn are clamped against the capstan's curved body, so force enters the specimen gradually rather than at one short gripped section. Capstans can be configured to accommodate a variety of flexible strapping material.

• Split capstan, constant closing pressure
• Configurable for flexible strapping
• For rope, wire, twine, cord and yarn

Compression Anvils

Flat-plate platens bear uniformly on specimens of widely different materials.

The anvils are rigidly fixed and not self-aligning, so the load path established at set-up is maintained without deviation through the test. Where a component requires different geometry, the tooling is designed around it.

• Flat-plate compression platens
• Rigidly fixed, not self-aligning
• Bulk materials and finished components
• Fixtures built to your specimen

Direct Compression Fixture

Axial loading restricts force to the specimen axis, eliminating parasitic bending.

Available capacities run from 5 kN to 400 kN, so the fixture is matched to the section being tested rather than oversized for it. Tooling is supplied to most of the standards under which compressive work is performed.

• Capacities 5 kN to 400 kN
• Direct compression, axial loading
• Tooling to most standards
• Custom geometry to your specimen

Three Point Bend Fixture

Direct compression applies flexural load using geometry matched to the method.

A light duty fixture is offered in 1, 2, 5 and 10 kN with span supports of 10, 15, 20 or 25 mm diameter, and a heavy duty attachment extends from 20 kN upto 200 kN. Spans adjust from 25 to 300 mm for samples upto 150 mm wide, covering timber, metal board and rigid plastics.

• Light duty 1, 2, 5 and 10 kN
• Heavy duty 20 kN upto 200 kN
• Span adjustable 25–300 mm
• Light duty supports 10, 15, 20 or 25 mm
• Sample width upto 150 mm

Four Point Bend Fixture

Four point loading holds the bending moment constant between the inner supports.

Force is introduced at two positions along the span and reacted outboard of them, so a defined length of the specimen carries equal stress rather than a single contact line. Failure therefore occurs at the weakest section of that length.

Shear Test Fixture

Positive location dictates where shear develops within the specimen under test.

The body seats each half of the specimen against the loading direction and prevents rotation or out-of-plane movement during the test. Alignment is a property of the fixture, so successive determinations are made under identical geometric conditions.

Tensile Shear Fixture

Shear strength results from tension along a single load axis.

The fixture holds the specimen within the tension train and transfers force across the interface under test, without introducing bending or torsional components. Mounting is to the same load frame and pull rods used for tensile determinations.

Slant Shear Fixture

Inclined seating loads a bonded joint in combined compression and shear.

The two halves of the assembly are held at a fixed angle, so the adhesive line carries a defined ratio of normal and sliding stress. Comparative work on competing adhesive systems is therefore made on a common basis.

Tile Slant Shear Fixture

Compressive travel displaces the adhered faces without clamping the bond.

The specimen sits in the fixture and shear develops as the crosshead advances, so a fragile adhesive layer takes no preload before the test begins. The measured resistance is that of the interface alone.

Briquette Grip

Profiled seats carry tensile load into a specimen without parallel gripping surfaces.

Moulded cement and mortar briquettes are held by their waisted form, with force applied axially through the casting itself. Repeatable positioning keeps recorded strength figures comparable from one briquette to the next.

Hook Fixture

Engagement at the end loop loads a helical component along its axis.

Hook grips accept tension springs and spring wire, retaining each specimen by its own formed hooks rather than between jaw faces. Force is transmitted through the wire form itself, so the coils remain clear of any clamped contact.

Nail Or Screw Withdrawal Fixture

Peak withdrawal load quantifies the retention timber offers a mechanical fixing.

Screws and nails are drawn from a wood sample and the maximum force required is recorded, in accordance with ASTM D1037, ASTM D143 and ASTM D1761. Test pieces of 50 mm × 50 mm × 150 mm allow different boards, densities and fastener types to be compared on one arrangement.

• Measures maximum withdrawal load
• To ASTM D1037, ASTM D143, ASTM D1761
• For samples 50 mm × 50 mm × 150 mm
• Screws or nails in wood specimens

Attachment For Needle Piercing Force Measurement

Penetration force is measured on the load frame, with no separate instrument.

Fitted into the existing test train, the attachment reports piercing resistance through Dyna Desk – Test Bench alongside tensile and compression results. Where a specimen or its geometry falls outside the standard arrangement, tooling is engineered to suit it.

• Needle piercing force measurement
• Mounts as an attachment to the machine
• Bespoke versions built to your specimen

Syringe-Push Test Fixture

Fixture design follows ISO 7886-1 Annex G for sterile single-use hypodermics.

Plunger friction, the force to eject from a syringe or syringe-and-needle device, breakaway at the start of injection and the sustaining force through it are all measured. Volume bands below 2 ml, 2–50 ml and above 50 ml are accommodated, upto a syringe diameter of 20 mm.

• To ISO 7886-1 Annex G, tested at 100 mm/min
• Plunger friction, breakaway, sustaining
• Volumes under 2 ml, 2–50 ml and over 50 ml
• Maximum syringe diameter 20 mm
• Downward set-up for needle cap pull-off

1 kN Pneumatic Grip

Vice action secures specimens of low breaking load at 1 kN capacity.

Intended materials are film, paper and soft plastics, held by pneumatically operated jaws. Flat metal faces are fitted as standard, and optional faces may be specified where the material requires a different contact surface.

• 1 kN, engraved on the grip body
• Pneumatically operated vice action
• Maximum jaw opening 6 mm
• Flat metal faces; optional faces available
• Foot pedal control supplied

2 kN Pneumatic Grip

Identical air pressure clamps every sample, removing grip force as a variable.

At 2 kN the fixture is specified for paper, soft plastics and textiles. Foot pedal control operates the jaws, so the specimen is positioned with both hands and remains undisturbed as the faces close.

• 2 kN, engraved on the grip body
• Pneumatic vice action, foot pedal control
• Maximum jaw opening 6 mm
• Standard flat metal jaw faces
• Chamber-rated option: −20/+150 or −70/+250 °C

5 kN Pneumatic Grip

Rated at 5 kN, the vice action clamps rubbers and soft plastics.

This capacity carries the same pneumatically operated jaw arrangement as the rest of the family. Where a specimen falls outside the published fixtures, Dak designs the grip to the specimen and to the standard under which it is tested.

• 5 kN, engraved on the grip body
• Pneumatically operated vice action
• Maximum jaw opening 6 mm
• Optional jaw faces to suit the specimen
• Foot pedal control supplied

10 kN Pneumatic Grip

Rubber and textile samples sit in air-actuated jaws rated at 10 kN.

Chamber-rated versions of the grip are offered where the test must run inside an environmental chamber, with the specimen held at temperature throughout. The vice action and the pneumatic control are identical to those on the lighter units.

• 10 kN, engraved on the grip body
• Pneumatic vice action, foot pedal control
• Maximum jaw opening 6 mm
• Flat metal faces as standard
• Chamber-rated option: −20/+150 or −70/+250 °C

Light Duty Pneumatic Grip

Light duty jaws hold film and paper where clamping force stays low.

Faces of 25 mm square in flat metal close to a maximum opening of 6 mm, presenting a small contact area for film, paper, soft plastics, rubbers and textiles. A foot pedal closes the jaws, so both hands stay free to align the specimen, and optional faces are available where the standard set does not suit the material.

• Pneumatic vice action, foot pedal control
• Jaw faces 25 mm square, flat metal
• Maximum jaw opening 6 mm
• Film, paper, soft plastics, rubbers, textiles
• Optional jaw faces available

Heavy Duty Pneumatic Grips

Extended jaw geometry brings more of the specimen under clamping pressure.

Flat metal faces of 50 mm square close to a maximum opening of 6 mm, taking film, paper, soft plastics, rubbers and textiles at greater width, and additionally suiting copper and aluminium foils. A foot pedal closes the jaws, and optional faces are available.

• Jaw faces 50 mm square, flat metal
• Maximum jaw opening 6 mm
• Pneumatic vice action, foot pedal control
• Film, paper, soft plastics, rubbers, textiles
• Suits copper and aluminium foils
• Optional jaw faces available

Pneumatic Vice Action Grip

Square flat metal faces and air-driven closure serve routine tensile testing.

The jaws open to a maximum of 6 mm and accept film, paper, rubbers and textiles. Vice action is one of the grip designs Dak builds, alongside wedge, compression and flexural, pull out and ring arrangements.

• Jaw faces 25 mm square
• Maximum jaw opening 6 mm
• Pneumatically operated vice action
• Foot pedal control supplied
• Optional jaw faces available

Heavy Duty Circular Hydraulic Wedge Grips

Hydraulic actuation closes the wedges, which tighten further as tensile load rises.

A general purpose fixture for flat and round rigid materials, accepting sections 0–25 mm thick and bar of 6 to 38 mm diameter, with capacities from 25 kN to 400 kN by model. An electric foot switch and a three-phase 440/220 VAC power pack operate the jaws, so the operator's hands remain free to align the specimen.

• Capacity 25 kN to 400 kN by model
• Flat samples 0–25 mm thick
• Round bar 6–38 mm diameter
• Three-phase 440/220 VAC power pack
• Electric foot switch operation

Heavy Duty Hydraulic Grips

Fluid pressure holds the closing force steady, so seating repeats between tests.

Built for heavy duty belts and geo-fabrics, the fixture holds upto 200 kN and accommodates specimens upto 200 mm wide — a width no wedge grip in the manual range reaches. Wedge inserts carried in a square housing clamp the specimen in tension, with hydraulic actuation in place of manual tightening.

• Holds upto 200 kN
• Specimen width upto 200 mm
• Hydraulic wedge action, square housing
• For heavy duty belts and geo-fabrics

Hydraulic Wide Vice Action Grips

Renewable facing discs match the contact surface to the material under test.

Vice action closed by hydraulic pressure secures soft wires, cords and fibres in tension. Aluminium is fitted as standard, and leather or hard rubber may be substituted where the specimen is easily damaged.

• Renewable aluminium facing discs
• Leather or hard rubber disc option
• For soft wires, cords and fibres

Twin Side Acting Hydraulic Grips

Twin side-acting cylinders apply even pressure over a broad specimen.

Heavy duty grips for belts and geo-fabrics, rated to hold upto 200 kN and to accommodate sections upto 200 mm wide. Hydraulic closure keeps a wide section aligned with the load axis for the duration of the test.

• Holds upto 200 kN
• Specimens upto 200 mm wide
• Twin side-acting hydraulic clamping
• For heavy duty belts and geo-fabrics

Motorised Ring Grip

Driven rotation exposes an O-ring's entire circumference to the tensile load.

A motor turns the lower bollard while the upper one is unrestrained, so the rubber specimen advances continuously over both surfaces as extension proceeds rather than bearing on its starting points. Bollard dimensions are available to suit specific standards.

• Motor-driven lower bollard
• Upper bollard free to rotate
• For O-ring type rubber specimens
• Bollard sizes to suit specific standards

Advanced Video Extensometer

Classified Class 1 to ISO 9513, with accuracy verifiable by calibration.

Advanced optical tracking eliminates mechanical influence, providing absolute measurement accuracy for delicate or highly extensible materials.

• Class 1 to ISO 9513 and EN 10002-4
• Resolution from 0.5 µm, upto 100 Hz
• Accuracy from ±2.5 µm or 0.5% of reading
• Fields of view 25 mm upto 1000 mm
• Runs with Series 7200 and Series 9000

Clip-On Extensometers

An activation force under 60 g leaves the specimen unaffected.

Engineered with a cross-flexure body for true centre-point bending, ensuring strict linearity and reliable strain data across standard testing ranges.

• Gauge length 10 to 50 mm
• Resolution 0.001 mm, hysteresis 0.10%
• Travel +10 mm, upto 25 mm extended
• Activation force typically under 60 g
• −10 to +65 °C, or −20 to +200 °C
• Transverse: widths and diameters 0 to 25 mm

High Elongation Extensometer

Gripper arms release at break, protecting the sensor from elastomer wrap.

Long-stroke precision designed to accurately track extreme extensions, perfectly suited for high-stretch polymers and elastomers.

• Travel range 800 mm
• Gauge length adjustable 15 to 50 mm
• Resolution 0.01 mm (10 microns)
• For maximum forces above about 20 N

Environmental Chamber 3009-006

Forced-convection heating with optional sub-zero cooling covers general-purpose thermal testing.

Maximum temperature is 300 °C, and −70 °C is reached when the liquid CO₂ option is specified. Stability is held within ±2 °C with overshoot no greater than 2 °C, and either limit is attained in less than 30 minutes.

• 300 °C maximum; −70 °C with liquid CO₂
• Temperature stability ±2 °C
• Overshoot 2 °C maximum
• Maximum or minimum in under 30 minutes
• Forced convection, stainless steel interior

Environmental Chamber 3009-007

Extended heating capability serves elevated-temperature testing while retaining sub-ambient operation.

The upper limit is 400 °C, and the liquid CO₂ option lowers the same cabinet to −70 °C. Self-tuning PID control reaches set point in the shortest possible time, and Ramp-To-Setpoint adds a programmable rate where a defined thermal history is required.

• 400 °C maximum; −70 °C with liquid CO₂
• Temperature stability ±2 °C
• Gradient ±1% of set point, or ±2 °C
• Recovery 4 minutes after 1 minute open
• 240/120 V, 50/60 Hz; upto 4.0 kVA

Environmental Chamber 3009-008

Liquid nitrogen extends the working range to −150 °C for cryogenic characterisation.

Heating to 300 °C is retained, and an exhaust port ducts waste gases safely to a ventilated area. The variable speed fan reduces turbulence for delicate specimens and can be switched off for short tests.

• −150 °C minimum with liquid nitrogen
• 300 °C maximum
• Temperature stability ±2 °C
• Variable speed fan, switchable off
• Heated glass window for video strain

Load Cells

The measurement the whole test rests on, from 0.05 kN to 600 kN.

S-type below 20 kN and low profile universal above it, in tension, compression or both. Each cell carries its own calibration in non-changing memory, so the system recognises what has been fitted — no presets, no trim pots, and no drift with voltage or temperature.

• Standard capacities 0.05 kN to 600 kN
• Tension, compression, or both
• Safe to 150%, protected to 300%
• Digital calibration, self-identifying
• ASTM E-4, ISO 7500/1, EN 10002-2, DIN 51221