Bahco 3851 Sandflex Cobra Bandsaw Blade | Cut to Length UK

This blade

The size you have chosen above, with the range's published details.

27 x 0.9mm, 2/3 TPI, PRX

Width	27mm
Thickness	0.9mm
TPI	2/3 (variable pitch)
Tooth form	PRX
Pricing	By length: the band plus the weld
Lengths	Welded from 1,000mm to 8,000mm
Brand	Bahco
Product code	3851
Construction	HSS tooth edge welded to a flexible alloy steel backing
Cuts	Steel, Stainless steel
Edge and tooth notes	Improved HSS tooth edge
Verification source	Manufacturer product page

Tooth form

What the manufacturer publishes about the tooth form of this blade.

PRX tooth: Bahco presents PRX as its general purpose tooth for contour cutting and smaller machines, on an M42 high speed steel edge. Bahco does not publish a rake angle for it.; Source: Bahco's published range.

Set and kerf

The set is the sideways angle given to the teeth. It makes the cut wider than the band body, so the body and the tooth edges clear the cut instead of rubbing. A wider set suits work where the cut tends to close on the blade. We do not publish a kerf or set width figure for this blade: ask us if your job depends on one.

All sizes

Every width, thickness, pitch and tooth form listed for this blade. Choose one to load it into the configurator.

Scroll sideways to see every pitch.

Listed sizes of 3851 Sandflex Cobra PRX Bandsaw Blade
Width x thickness	0.7/1 TPI	1/1.4 TPI	1.4/2 TPI	2/3 TPI	3/4 TPI	4/6 TPI	5/8 TPI	6/10 TPI	8/12 TPI	10/14 TPI
27 x 0.9mm
34 x 1.1mm
41 x 1.3mm
54 x 1.3mm
54 x 1.6mm
67 x 1.6mm

About this blade

Bahco Sandflex Cobra 3851 is a production metal cutting bi-metal bandsaw blade built for high performance. Bahco gives it an improved HSS tooth edge over the general purpose 3851. It suits production sawing of steel including stainless, where consistent output matters more than blade price. Supplied cut to length and welded for your machine.

Specifications come from the manufacturer's published information. If the job is unusual, talk to us before you order.

Cuts these materials

Industries that use this kind of blade

Reading the TPI

TPI is the number of teeth per inch along the band. A single figure, such as 14, is a constant pitch: the teeth are evenly spaced. Two figures, such as 2/3, are a variable pitch: the spacing changes along the band between 2 and 3 teeth per inch, which breaks up vibration and lets one blade cover a wider spread of section sizes.

Read the pitch against the thickness of metal the teeth pass through. The published rule is to keep between 6 and 24 teeth in the cut: too few and each tooth takes too big a bite, too many and the gullets clog. Thick sections need a coarse pitch, thin sections and tube walls a fine one.

For tube, profiles and bundles the pitch depends on the wall thickness too. The blade finder works it out from your section and names the chart it used.

Pitch for solid sections

The published chart for solid bar, by section thickness. The rows for pitches this blade is listed in are marked.

Pitch for solid sections
Section thickness	TPI
0 to 5mm	18
4 to 8mm	14
2 to 15mm	10/14 (listed for this blade)
8 to 20mm	8/12 (listed for this blade)
16 to 30mm	6/10 (listed for this blade)
25 to 40mm	5/8 (listed for this blade)
35 to 70mm	4/6 (listed for this blade)
60 to 120mm	3/4 (listed for this blade)
80 to 200mm	2/3 (listed for this blade)
120 to 400mm	1.5/2
250mm and up	1.1/1.6
400mm and up	0.75/1.25

Source: Addler (Excision) bandsaw blade tooth selection guide, corroborated by the Dakin-Flathers TPI chart. Accessed 2026-07-28. Starting recommendations from published manufacturer guidance, not guarantees. Tune at the machine.

How it compares in bi-metal blades

The nearest products in this range, compared on what the manufacturers publish. The from price is the lowest listed price for each product.

3851 Sandflex Cobra PRX Bandsaw Blade against the nearest products.
Consideration	This product	Challenger Bandsaw Blade	Maverick Bandsaw Blade	Production M42 Bandsaw Blade
Range code	3851	Not listed	Not listed	Not listed
Construction	HSS tooth edge welded to a flexible alloy steel backing	HSS tooth edge welded to a flexible alloy steel backing	HSS tooth edge welded to a flexible alloy steel backing	HSS tooth edge welded to a flexible alloy steel backing
Cuts	Steel, Stainless steel	Structural steel, Tube, Channel	Tool steel, Stainless steel, Structural steel, Aluminium, Cast iron, Nickel alloys, Titanium alloys	Alloy steel, Stainless steel
Edge and tooth notes	Improved HSS tooth edge	Not listed	Not listed	Not listed
Widths	27mm to 67mm	27mm to 54mm	27mm to 54mm	13mm to 27mm
Price	From £13.12 ex VAT, £15.74 inc VAT	From £13.21 ex VAT, £15.85 inc VAT	From £13.17 ex VAT, £15.80 inc VAT	From £8.43 ex VAT, £10.12 inc VAT

From the blog

Frequently asked questions

What does M42 mean on a bandsaw blade?

M42 is a cobalt high speed steel grade used for the tooth edge of bi-metal blades. It holds its hardness at the temperatures generated when cutting steel, so the edge outlasts carbon steel teeth on ferrous work.

When should I step up from M42 to M51?

M51 carries more tungsten and suits harder, more abrasive work such as tempered steels, larger solid sections and some exotic alloys. If M42 blades are wearing quickly on tough ferrous material rather than failing from fatigue, M51 is the usual next step.

How do I measure the blade length my machine needs?

Check the machine's specification plate or manual first: most state the blade length in millimetres. If neither survives, measure an old blade by marking the weld, rolling the loop along a straight line on the floor and measuring the distance covered. The measuring guide walks through both methods.

Can I order a length outside the range shown?

Use the enquiry link under the length field on this page and tell us the length and the machine. We will come back to you.

Full measuring instructions are in our guide, How to measure a bandsaw blade length, and on the custom lengths page.

Need a different blade or a different length? Price any blade we list at the exact loop length your machine takes.

Price a custom length

3851 Sandflex Cobra PRX Bandsaw Blade

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