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IRWIN
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IRWIN: understand the range before choosing
IRWIN is a hand-tool brand. This AutoMotoPart page contains two 300mm bi-metal hacksaw-blade packs and one self-retracting safety knife. The 18 TPI blade is IRWIN 10504523, the 24 TPI blade is 10504524 and both packs contain two blades. The knife evidence matches IRWIN's 2088600 design with a 2mm box-cutting position and a full-extension general-use position.
AutoMotoPart currently lists 3 IRWIN items. The largest IRWIN groups are 3 tools entries. IRWIN totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact IRWIN listing, its current technical information and the item in front of you must agree.
What the IRWIN page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| Tools | 3 | The Tools group contains 18 TPI and 24 TPI 300mm bi-metal hacksaw blades plus one self-retracting safety knife; select by task rather than treating them as substitutes. |
The page contains three unique products. The two hacksaw items share 300mm length, bi-metal construction and a two-blade pack, but differ in pitch: 18 TPI or 24 TPI. The safety knife is a separate cutting tool, not a handle for either hacksaw blade. Package dimensions in the live text do not describe blade fit or cutting capacity.
Build a reliable shortlist
Identify the material, profile and wall thickness, then decide whether a hand hacksaw or controlled utility-knife cut is appropriate. Inspect for live wiring, pressurised lines, hidden fixings and hazardous coatings before cutting. Establish a stable support, clearance for the stroke or knife path and a safe landing point after breakthrough.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Blade reference | 18 and 24 TPI packs look similar but cut different section ranges | 10504523 or 10504524, EAN and printed pitch |
| Frame fit | Length, pin holes and tension must agree with the hacksaw | 300mm frame instructions and undamaged mountings |
| Tooth engagement | Too few teeth snag; overcrowding can impede chip clearance | Material thickness and at least several teeth in the cut |
| Knife exposure | Extra exposed blade increases reach and injury risk | 2mm box position or approved full extension |
| Workholding | Movement promotes binding, blade breakage and uncontrolled breakthrough | Vice, clamp, support and protected finished surface |
| Protection | Swarf, offcuts and freshly cut edges remain sharp | Risk assessment, eye protection and safe debris collection |
Do not select 18 or 24 TPI from material name alone. Sheet, tube, angle and solid bar present different thickness at the tooth line. For hollow profiles, the number of engaged teeth changes during the stroke, so orientation and support are part of the choice.
18 TPI blade 10504523
IRWIN's official European listing identifies 10504523 as a 300mm, 18 TPI bi-metal hacksaw blade supplied in a pack of two. Its wider tooth spacing can help chip clearance in eligible thicker sections. That does not make it a demolition blade or establish a maximum material size. Check that several teeth remain engaged and that the frame can complete a straight stroke without contacting surrounding components.
Mark the cut, clamp the work and begin with light accurate strokes so the teeth establish a track. Increase to steady full strokes without forcing or twisting. Lubrication depends on the work material and workplace method; do not improvise flammable or incompatible fluid. If teeth strip, the blade skates or the cut curves, stop and correct pitch, tension, workholding or technique rather than pressing harder.
24 TPI blade 10504524
IRWIN identifies 10504524 as the corresponding 300mm bi-metal two-pack with 24 TPI. Closer tooth spacing is useful where a thinner metal section would engage too few 18 TPI teeth. It can also support a more controlled start, but fine pitch does not guarantee a burr-free finish. Thin sheet still needs firm support to prevent vibration, tearing and edge distortion.
Tube and angle should be positioned so the blade does not suddenly encounter a wide unsupported face. Use light pressure as the tooth engagement changes, and support the offcut before breakthrough. Do not touch a freshly cut edge to test smoothness. Deburr by an appropriate method after the work has cooled and been made safe, then collect sharp swarf without brushing it towards hands.
Blade installation, tension and frame control
Release the frame tension by its instructions and inspect pins, handle and bow. Fit the correct 300mm blade squarely on both pins, with tooth direction matching the frame's intended cutting stroke. Apply the specified tension; a slack blade can wander and buckle, while excessive tension may damage blade or frame. Never fit a cracked, kinked, rusty or tooth-stripped blade merely to finish one cut.
Keep the wrist aligned and the frame in the cut plane. Use the blade length rather than short rapid strokes concentrated at one point. Avoid sideways correction under load. When working near a vehicle, isolate electrical or fluid hazards and shield finished surfaces from the bow, offcut and swarf. A hacksaw must not be used on an unidentified pressurised, fuel-bearing or live component.
Self-retracting safety knife 2088600
The official IRWIN product record for 2088600 confirms self-retracting spring action, an interlocking nose, ergonomic grip and two positions. The short position exposes about 2mm for eligible box material; the full position is for general tasks that genuinely require it. Retraction occurs when the operating action is released, so grip, contamination or a jammed mechanism must not be allowed to defeat it.
Cut on a stable surface away from the body. Place the free hand behind the knife, never in front of or below the path. Use shallow repeated passes rather than excess force where appropriate, and avoid hidden contents. Do not cut cable, hose, belts or trim still installed around live or safety-critical systems unless the repair procedure explicitly calls for it and the system is safely isolated.
Inspection, blade changes and disposal
Before work, extend and release the knife in a controlled direction to confirm immediate free retraction. Examine the nose and housing for looseness, residue and impact damage. Use IRWIN's tool-free entry procedure only on a stable bench with the blade controlled. Wear suitable cut protection for blade handling without assuming gloves make contact safe, and install only a compatible blade in the correct orientation.
A dull knife blade encourages force and should be changed before it slips or tears material. Used utility and hacksaw blades remain sharps: do not leave them on benches, wrap them loosely in paper or place them in ordinary open waste. Put them directly into the workplace's rigid blade container. Store the knife retracted and prevent unauthorised access to every cutting tool.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Assess | Identify material, thickness, hazards and intended finish | Cutting an unknown installed component |
| Select | Match 18 or 24 TPI, or choose the shortest knife exposure | Assuming one pitch or full extension suits everything |
| Prepare | Inspect tool, fit and tension blade, clamp and support work | Holding the offcut in the free hand |
| Cut | Keep alignment, moderate force and a clear body position | Twisting, side loading or cutting towards the body |
| Finish | Support breakthrough, deburr safely and contain blades and swarf | Touching sharp edges or leaving used blades loose |
Record blade pitch when repeat jobs are sensitive to finish or time. A known successful combination of material profile, orientation, clamping and pitch is more valuable than a generic statement that a blade cuts metal.
Reading real IRWIN references
The IRWIN names below are examples from the current range and show why the complete description matters. They are not universal IRWIN recommendations and should not be treated as a fitment list. Within IRWIN, a shared family word can conceal a different dimension, connector, material, pack format, operating condition or installation side.
| Example listing | What to verify beyond the name |
|---|---|
| Bi Metal Hacksaw Blades - 300mm - 24 TPI - Pack Of 2 | 10504524, 300mm, 24 TPI, bi-metal and pack of two |
| Safety Knife | 2088600 self-retracting knife, free mechanism, compatible blade and two positions |
| Bi Metal Hacksaw Blades - 300mm - 18 TPI - Pack Of 2 | 10504523, 300mm, 18 TPI, bi-metal and pack of two |
The live knife description includes a nonsensical minimum-age field, which has been excluded. Neither packaging measurements nor a catalogue age value establishes user competence, legal access or workplace authorisation. Training, supervision and the local cutting-tool procedure control use.
Common errors around IRWIN products
- Fitting a 300mm blade to a frame with incompatible pins or tension range.
- Choosing 18 or 24 TPI without considering the thickness actually crossing the teeth.
- Sawing unsecured work or holding the offcut in the free hand.
- Twisting a bi-metal blade in the cut because it is described as flexible.
- Forcing a dull or tooth-stripped blade instead of replacing it.
- Defeating the safety knife's spring return or holding its slider open with tape.
- Using full blade extension for shallow packaging or cutting towards the body.
- Discarding used blades loose or sweeping sharp swarf by hand.
IRWIN questions and answers
Q: Which IRWIN hacksaw blades are listed?
A: 300mm bi-metal packs of two in 18 TPI 10504523 and 24 TPI 10504524.
Q: What does TPI mean?
A: Teeth per inch; it describes tooth spacing, not the blade length or guaranteed cutting capacity.
Q: When is 18 TPI useful?
A: Generally on eligible thicker sections where several teeth engage and chip clearance is needed.
Q: When is 24 TPI useful?
A: Generally on thinner sections needing closer tooth spacing and controlled engagement.
Q: Will either blade fit every hacksaw?
A: No. Confirm 300mm length, mounting pins and the frame's tensioning instructions.
Q: Are bi-metal blades unbreakable?
A: No. They resist shattering but damage, twist, side load and bad tension can still cause failure.
Q: What is the safety knife reference?
A: The matched official design is IRWIN 2088600.
Q: What are its two blade positions?
A: About 2mm for eligible box cutting and full extension for approved general use.
Q: Does self-retracting mean cut-proof?
A: No. It reduces exposed time but does not replace a safe path, workholding or hand position.
Q: Can the retraction be locked open?
A: Do not defeat or modify the mechanism; use another appropriate tool if the task is unsuitable.
Q: When should a blade be changed?
A: When dull, chipped, bent, contaminated or unable to cut predictably with moderate force.
Q: How are used blades discarded?
A: Place them directly in the workplace's rigid sharps or blade container.
