How To Read Locating Hole Notation

A pattern such as 4-11-63 normally means 4 locating holes, 11mm hole diameter and 63mm pitch circle diameter. Some blades use more than one locating hole pattern, so a drawing or sample blade is the safest confirmation.

Common Reference Table

What To Confirm Before Production

Confirm outer diameter, bore, plate thickness, kerf, number of locating holes, hole diameter, PCD, rotation direction and whether the machine flange has special grooves or pin positions.

Best Evidence To Send

Send a clear photo of the old blade, a close-up of the bore and locating holes, the machine flange photo, a hand drawing with measurements or the original blade drawing. This avoids wrong fit and production delay.

What Is A GF Saw Blade?

A GF saw blade is a small circular blade used on portable orbital tube cutting machines. These blades are common in stainless steel pipe installation, clean pipeline work, maintenance cutting and tube-end preparation before welding.

For industrial buyers, the important point is repeatability. A blade that fits the machine but has the wrong tooth count or thickness can still create burrs, vibration, short life or unstable cutting. The safest selection method is to confirm the machine data first, then match the tube material and wall thickness.

Start With Machine Fit

Before discussing material or tooth count, confirm the machine model, blade outer diameter, bore size, plate thickness, kerf, pin holes and maximum cutting capacity. Many GF / SL style blades use a 16mm bore, but the final fit should always be checked against the machine, current blade or a clear sample photo.

Match Tooth Count To Tube Wall Thickness

Thin-wall stainless steel tube usually needs a finer tooth count to reduce grabbing and improve end-face quality. Thicker wall tube needs more chip space, so a lower tooth count is often more stable. The blade should cut smoothly without forcing the machine.

Too many teeth on a thick wall tube can overload the cutting edge and pack chips. Too few teeth on a thin wall tube can catch the tube, increase burrs and create a rougher cut.

Selection Checklist For Buyers

Common Cutting Problems And Causes

Information To Send For A Fast Recommendation

For a useful recommendation, send more than a blade diameter. The following information lets us check machine fit and cutting result before quoting.

Final Recommendation

If you already have a working blade, start from the existing specification and improve only the problem point. If you are replacing an unknown blade, confirm the machine model, bore size and wall thickness range first. For repeat orders, keep one confirmed blade record for each tube material and wall thickness group.

Yansam can support GF and SL series replacement saw blades by sample, drawing or machine data. For distributors and industrial users, keeping confirmed specification records helps future orders stay consistent.

Send GF Blade Cutting Details

Why Coating Matters

Coating helps reduce friction, improve wear resistance and support more stable cutting. It cannot fix every problem, but it can improve blade life when the base blade, tooth pitch and machine condition are correct.

Do Not Choose Coating Alone

If tooth count, feed, speed, clamping or coolant are wrong, a better coating may still fail. Send the full cutting condition before selecting a coating.

What To Send

Send blade OD, thickness, bore, tooth count, material grade, machine model, current coating if known, cutting speed, coolant condition and the problem you want to solve.

1. Run In A New Or Reground Blade

When a new HSS blade or a freshly reground blade is installed, reduce feed speed during the first 10 minutes of cutting. This gives the machine and blade a proper running-in period and helps extend blade life.

2. Match Feed And Speed To Material

Cutting speed and feed depend on workpiece cross-section and material toughness. Difficult or high-toughness materials such as stainless steel usually benefit from slower feed. When the material section is smaller, machine speed can sometimes be increased carefully.

3. Regrind At The Right Time

Any cutting operation needs effective cutting angle and tooth clearance. Timely and correct regrinding helps the HSS blade maintain maximum cutting performance. If vibration, noise, surface problems or unstable feeding appear, stop and inspect the blade rather than forcing the cut.

4. Use Suitable Coolant

Cutting produces heat. Without suitable coolant, blade life and cutting surface can both become worse. Coolant should be selected according to the workpiece material and machine condition.

5. Read The Chip Shape

6. Common After-Sales Problem Causes

Abnormal cutting may come from the material, blade, cutting machine or operator behavior. Material impurities can crack the blade or make the cut surface uneven. A softer HSS blade may avoid cracking but can still produce skew if the material causes turning during contact.

Blade-related causes include deformation from poor protection, dull teeth, wrong tooth count, insufficient blade strength, wrong blade type or poor quality. Machine-related causes include poor clamping, incorrect blade installation, runout, wrong cutting speed, unsuitable cutting oil and unstable fixtures.

Manual machines require extra care because the operator controls feed. Excessive force or too-fast feeding can cause blade cracking. Before cutting, confirm the workpiece is fixed, cutting conditions match the material, fixture surfaces are clean, rotation direction is correct, the blade is firmly installed, entry and exit are not too fast, and cutting oil is sufficient.

Common Symptoms And First Checks

What We Need To Diagnose

Send the current blade size, blade photo, machine model, material grade, workpiece size, wall thickness, coolant condition, daily cutting quantity and photos or videos of the problem.

When To Change Blade Type

If repeated adjustments do not solve the problem, the application may need a different blade family, coating, carbide grade, tooth count or kerf. This is why GF, HSS, TCT and cermet blades should be compared by real cutting condition.

1. Choose The Series By Cutting Condition

F series is more adaptable for mixed materials, older equipment and less ideal chip control. V series is used for faster, heavier cutting and stronger life requirements. S series is closer to light cutting and is useful for sticky materials, cleaner finish and stable equipment.

2. Treat Coating As A Performance Multiplier

PVD coating can reduce friction, lower tooth tip temperature and improve cutting life on suitable materials. However, coating cannot solve wrong tooth count, poor clamping, chip build-up, bad oil mist or machine maintenance problems.

3. Check Machine Condition Before Test Cutting

Confirm the wire brush can remove chips, oil mist reaches the cutting surface, air blowing removes inner tube chips, the clamp holds the material, the flange and machine head are clean, and the blade is installed without forced pressure.

4. Diagnose Abnormal Damage

5. Record Data Before Comparing Blades

A serious cermet blade test should record current blade performance, test blade performance, material grade, diameter, speed, feed, oil condition, cut surface and final blade damage state. Without comparable data, the test result is difficult to judge.