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Stainless Steel Self Drilling Tek Screws from Anzor

self drilling tek screws

Stainless Steel Self Drilling (Tek) Screws - hard enough?

There are two main types of Stainless Steel Self-Drilling Screws - Self Drilling Screws for Timber which often have a Type 17 style cutting flute:

timber tek screw

And Self Drilling Screw for Metal often called a Stainless Steel Tek Screw:

metal tek screw

Here we are talking about the Self Drilling Screw for Metal often called a Stainless Steel Tek Screw.

These are screws designed to self-drill into metal. There are several material types available and they each have their strengths and weaknesses. Getting the material right for your application is critical. Some Stainless Steel Grades have excellent corrosion resistance (304 and 316) but are relatively soft and will not self-drill through much more than the skin of a milk pudding! Other grades like 410 are heat treated and have excellent hardness - but anywhere near salt-water (or any sort of coastal atmosphere) and you will see some tea-staining pretty quick! Some grades such as Hardtec and Marutex Stainless Steel feature the benefits of both (hardness and excellent corrosion resistance) - but are only available in Hex Washer Face Head style. Getting the right material grade and screw type for your application is critical.

The Self Drilling Screw for Metal is generally available in 5 material types within the Stainless Steel range, they are:

Bi-Metal Self Drilling Screws - these are not completely Stainless, the Bi-Metal screw generally has a 304 Stainless Steel body with a Carbon Steel tip. Because of the Carbon Steel tip they are very hard and good for drilling but they are not 100% Stainless Steel. They have a 500hrs Salt Spray Protective Ruspert Coating on them to increase corrosion resistance somewhat.

410 Stainless Steel Self Drilling Screws - These are completely Stainless Steel. 410 is a Martensitic Stainless Steel and so can be hardened by heat treatment (which Austenitic types 304 and 316 cannot be). For this reason it has excellent drilling properties - however 410 has lower corrosion resistance than grade 304 and should not be used in highly or even moderately corrosive environments or tea-staining will result.

304 and 316 Stainless Steel Self Drilling Screws - Because the 300 series of Stainless Steels are of an Austenitic crystal structure - hardening by heat treatment is not possible. These screws provide excellent corrosion resistance but are really only good for self-drilling through thin aluminium due to the softness of the material.

Hardtec/Martuex Stainless Steel - Both 'Hardtec' and 'Marutex' grades of Stainless Steel are propriety grades made specifically for Stainless Steel Self Drilling Screws. They are hardened by heat treatment and so have excellent drilling performance into metals like grade 410 BUT unlike grade 410, these grades have Molybdenum added to them and have corrosion resistant properties in line with the 300 series Stainless Steel grades. Salt Spray tests show corrosion equal or better to that of 304 Stainless Steel and not far behind 316 Stainless Steel. They are an excellent screw!

The different Stainless Steel Self-drilling Screws available:

Type  Material  Strength  Weakness  Availability 
Winged Self Drilling Screw   410 Stainless Steel  Excellent for fixing timber to metal (self-drilling through plywood then into steel).  Corrosion resistance is to a medium level - not ideal for highly corrosive environments  Ex stock Anzor 
Countersunk Head Square or Phillips Drive Self Drilling Screw  410 Stainless Steel  Excellent drilling hardness- greater than 304 and 316  Not ideal for highly corrosive environments  Ex stock Anzor 
Pan Head Square or Phillips Drive Self Drilling Screw  410 Stainless Steel  Excellent drilling hardness- greater than 304 and 316  Not ideal for highly corrosive environments  Ex stock Anzor 
Bi-metal HWF Self Drilling Screws  Bi-Metal (304 Stainless body with Steel tip - and 500hrs Salt Spray Ruspert Coating)  A good cost effective option  Not 100% Stainless Steel.  Ex stock Anzor 
410 Self Drilling Screws  410 Stainless Steel  Excellent hardness for drilling metals.  Not suited for highly corrosive environments  Only stocked by Anzor in Countersunk and Pan Head. 
304 HWF Self Drilling Screws  304 Stainless Steel  Soft and only hard enough for drilling thin Aluminium.  Moderate corrosion resistance.  Not stocked by Anzor - too soft, see Hardtec/Marutex below. 
316 HWF Self Drilling Screws  316 Stainless Steel  Soft and only hard enough for drilling thin Aluminium.  High level of corrosion resistance  Not stocked by Anzor - too soft, see Hardtec/Marutex below. 
Hardtec HWF Self Drillers and Marutex HWF Self Drillers  Hardtec/Martux Stainless Steel  Very high level of hardness-excellent for self-drilling metal  High level of corrosion resistance (like 300 series Stainless Steel)  Ex stock Anzor 

Feel free to give us an email or call to help you find the best Self Drilling Screw solution.



Anzor Fasteners LLP Profile

07 9711 9977

Unit 7, 15 Overlord, PLace, Acacia Ridge, Brisbane, Qld, 4110

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Anzor Fasteners LLP Profile

07 9711 9977

ENQUIRE HERE

ENQUIRE NOW






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