Cut-Off Saw Blade Compatibility Guide

Name: Cut-Off Saw Blade Compatibility Guide: Stihl, Husqvarna, Makita & Soff-Cut
Brand: Quality Diamond Blades
Availability: InStock

Cut-Off Saw Blade Compatibility Guide: Stihl, Husqvarna, Makita & Soff-Cut

QDB

QDB Engineering

Diamond Tooling Engineers · 15+ Years Field Experience

Direct Answer: Most handheld gas cut-off saws like the Stihl TS420, Husqvarna K770, and Makita EK7651H use standard 14-inch (350mm) diamond blades with a 1-inch arbor that includes a removable 20mm heavy brass adapter bushing. Larger demolition saws like the Stihl TS800 run 16-inch blades (20mm arbor), while early-entry flat saws like the Husqvarna Soff-Cut 150 require dedicated 6-inch or 8-inch blades with a triangular knockout arbor. Running the wrong arbor size causes severe blade vibration, arbor shaft scoring, and segment loss. For replacement blades matched to your exact saw model, call (661) 592-1022 for same-day SoCal pickup.

The Problem: Mismatched Arbors, Vibration, and Burned Bearings

There is nothing more frustrating on a jobsite than pulling a brand-new 14-inch diamond blade out of the box, mounting it to your Stihl TS420 or Husqvarna K770, and feeling the saw vibrate violently the second you pull the throttle. In nine out of ten cases, the operator tried to mount a 1-inch arbor blade onto a 20mm shaft without the proper brass bushing, or clamped an uneven washer against the steel core.

Running a loose blade damages the saw's output spindle, chews through drive belts in days, and knocks synthetic diamond segments loose from impact shock. Below is the direct contractor compatibility guide covering every major saw on California jobsites.

1. Handheld Gas Cut-Off Saws (The Big 3)

Stihl Cutquik Series (TS410, TS420, TS500i, TS700, TS800)

Stihl TS410 / TS420 / TS500i (Electronic Injection): Uses a 14-inch (350mm) blade with a 20mm arbor. Max cutting depth is 4.9 inches. Standard operating RPM is 5,350 RPM. If buying general contractor blades with 1-inch arbors, ensure a heavy-duty copper or brass 20mm reducing bushing is firmly seated in the center hole.
Stihl TS700 / TS800: High-displacement 98.5cc saws. The TS700 runs a 14-inch blade, while the heavy-duty TS800 runs a 16-inch (400mm) blade providing a 5.9-inch cutting depth. Both require 20mm arbors rated for 4,800 to 5,400 max RPM.

Husqvarna Power Cutters (K770, K970, K1270)

Husqvarna K770 (73.5cc): Standard 14-inch blade. Husqvarna features a reversible arbor bushing on the outer flange that flips between 20mm and 1-inch (25.4mm). Ensure the flange is flipped to the correct side before tightening the center bolt to 18–22 ft-lbs torque.
Husqvarna K970 / K1270: Available in 14-inch and 16-inch configurations. Commonly used for heavy pipe trenching, precast tilt-up wall cuts, and municipal street repairs. Max spindle RPM is 5,400 RPM for 14" and 4,700 RPM for 16".

Makita 4-Stroke Power Cutters (EK7651H, EK8100)

Makita EK7651H: 75.6cc 4-stroke engine (straight gas, no 50:1 2-stroke oil mix required). Uses a 14-inch blade with a 20mm arbor. Because 4-stroke saws produce high low-end torque, choose laser-welded blades with drop segments to avoid segment shear under heavy down-pressure.

2. Early-Entry Green Concrete Saws (Soff-Cut System)

Cutting expansion control joints in fresh "green" concrete (poured 1 to 4 hours earlier) requires dedicated early-entry saws to prevent micro-cracking. Standard flat saws will tear the loose aggregate and produce ragged edges.

Husqvarna Soff-Cut 150 & 2000: Use 6-inch and 8-inch diameter blades featuring a patented triangular arbor.
Matching Aggregate Hardness:
- Purple Bond (Ultra Hard Aggregate): For hard river rock, granite, and chert aggregates common in Southern California riverbeds.
- Amber Bond (Medium-Hard Aggregate): For limestone and standard gravel mixes.
- Orange / Red Bond (Soft / Abrasive Aggregate): For crushed brick, volcanic rock, and highly abrasive sand mixes.

3. Walk-Behind Flat Saws (Street & Highway Slicing)

Walk-behind diesel and gas flat saws (Husqvarna FS400/FS500, Multiquip/Mikasa, Core Cut CC1800, Norton Clipper) operate under different mechanical principles:

Arbor Standard: 1-inch (25.4mm) round arbor equipped with a drive pin hole.
The Drive Pin is Mandatory: The drive pin locks the blade to the inner drive collar. If the drive pin is sheared or missing, the blade will slip against the flange under heavy engine torque, scorching the blade core and wearing a groove into your saw shaft.
Diameters: 14", 16", 18", 20", 24", 30", and 36" blades. Always check your blade guard clearance before stepping up in diameter.

Quick Reference Saw Compatibility Chart

Saw Make & Model	Blade Diameter	Arbor Specification	Max Spindle RPM	Recommended QDB Blade
Stihl TS420 / TS500i	14 Inch (350mm)	20mm (or 1" w/ 20mm Bushing)	5,400 RPM	14" Laser-Welded Concrete
Husqvarna K770 / K970	14" or 16"	Reversible 20mm / 1"	5,400 / 4,700 RPM	14"/16" Multi-Material Demo
Makita EK7651H (4-Stroke)	14 Inch (350mm)	20mm Arbor	5,400 RPM	14" Combo Concrete/Asphalt
Soff-Cut 150 / 2000	6" & 8"	Triangular Knockout	6,000 RPM	6"/8" Early-Entry Green Slab
Walk-Behind Flat Saws (13-65HP)	16" to 36"	1" Arbor + Drive Pin	2,500 - 4,500 RPM	Heavy Slab Road Blades

Contractor Direct Tooling & Will-Call in Santa Clarita

Never let a stripped arbor bushing or worn-out blade halt production on your jobsite. Quality Diamond Blades stocks complete contractor multi-packs for Stihl, Husqvarna, and walk-behind saws with pre-installed heavy brass bushings. Stop by our will-call counter at 25583 Avenue Stanford, Santa Clarita, CA 91355 or call our tooling dispatch desk at (661) 592-1022 for instant contractor discounts.

Frequently Asked Questions

What size diamond blade fits a Stihl TS420 cut-off saw?

The Stihl TS420 runs a 14-inch (350mm) blade with a 20mm arbor. Most contractor blades come with a 1-inch arbor pre-fitted with a 20mm brass adapter bushing. If the bushing is missing or loose, do not run the saw—it will cause heavy vibration and destroy the arbor spindle bearings.

What is the difference between a 20mm and 1-inch saw arbor?

European-designed gas saws (Stihl, Husqvarna) commonly use a 20mm (0.787 inch) arbor shaft, whereas American walk-behind flat saws and masonry table saws use a 1-inch (25.4mm) arbor with a drive pin. Running a 1-inch blade on a 20mm shaft without a secure press-fit brass bushing causes the blade to mount off-center, making the saw hop and chip concrete.

What diamond blade arbor does a Soff-Cut early entry saw use?

Husqvarna Soff-Cut saws (such as the Soff-Cut 150 and 2000) use a patented triangular arbor connection and matching skid plate. Standard round-hole diamond blades will not fit Soff-Cut saws without damaging the shaft. Always match the blade bond color (purple, amber, or orange) to the aggregate hardness of the green concrete pour.

What blade size fits a Husqvarna K770 and K970?

The Husqvarna K770 uses a 14-inch blade with a reversible arbor bushing (fits both 20mm and 1-inch setups). The larger K970 and K1270 can be equipped with either a 14-inch or 16-inch guard depending on the model arm configuration.

Where can I pick up replacement gas saw blades today in Los Angeles?

Quality Diamond Blades stocks complete inventories of 12-inch, 14-inch, 16-inch, and early-entry diamond blades with pre-installed 20mm bushings at our Valencia warehouse: 25583 Avenue Stanford, Santa Clarita, CA 91355. Call (661) 592-1022 for 15-minute will-call pickup.