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Boardtech Flat Countersunk Stainless Steel SUS410 5×35

Model 725668 / ボードテック平サラ ステンレス(サスガードSG処理) / Japan Power Fastening Corporation (Official website)

Flat countersunk tapping screw made of stainless steel SUS410 with enhanced corrosion resistance. Full thread type.

Last verified: (date the content was verified against the source document)

Specifications

Thread type 5 TPI coarse thread, full thread
Head outer diameter D 12 mm
Cross recess number #2
Thread outer diameter d 5.0 mm
Overall length L 35 mm
Head plus cylindrical part length 5 mm
Thread length 22.5 mm
Cutting edge outer diameter 4.2 mm
Cutting edge length 7.5 mm
Applicable plate thickness minimum 1.6 mm
Applicable plate thickness maximum 3.2 mm
Grip length min. 6.6 mm
Grip length max. 22.5 mm
Box quantity 250 本/箱

ボードテック平サラ ステンレス(サスガードSG処理) model comparison

Compare 6 models in the same series by specification.

Model Thread outer diameter d Overall length L Thread type Applicable plate thickness minimum Applicable plate thickness maximum Cross recess number Head outer diameter D Thread length
725668 This product 5.0 mm 35 mm 5 TPI coarse thread, full thread 1.6 mm 3.2 mm #2 12 mm 22.5 mm
725679 5.0 mm 45 mm 5 TPI coarse thread, full thread 1.6 mm 3.2 mm #2 12 mm 32.5 mm
725690 5.0 mm 60 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 37.5 mm
725701 5.0 mm 70 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 37.5 mm
727879 5.0 mm 50 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 37.5 mm
730981 5.0 mm 80 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 37.5 mm

How to choose Tapping screws

Points to check when selecting, with the values for this product (725668).

  1. 1. Select the range that matches the steel substrate thickness

    This product: Applicable plate thickness maximum 3.2 mm

    Drill screws have both an upper and lower limit on the steel sheet thickness they can drill through with the cutting tip. The listed products have a lower limit of 1.6 mm and an upper limit of 2.3 to 3.2 mm. If the substrate is thicker than the range, the cutting tip wears before the hole is drilled; if thinner, the thread engagement is insufficient. Check both the upper and lower limits against the plate thickness of the substrate steel.

  2. 2. Determine the length from the total fastening thickness

    This product: Overall length L 35 mm

    The overall length is determined by the combined thickness of the upper panel and substrate, plus the length needed for the cutting section to fully penetrate. The listed products range from 28 to 100 mm, and the upper and lower fastening thickness limits are specified for each product. If the thread engages before the cutting section (7 to 7.5 mm long) passes through the substrate, the screw may break, so confirm within the fastening thickness range.

  3. 3. Choose between full-thread and half-thread types

    This product: Thread type 5 TPI coarse thread, full thread

    Half-thread screws have a plain cylindrical section under the head, so they can pull the upper panel down to the substrate without being pushed up by the threads, which suits fixing thick boards. In the listed products, the 35 and 45 mm lengths are full-thread and 50 mm and longer are half-thread. Select the type according to the upper panel thickness and fixing method.

  4. 4. Check the thread outer diameter and cutting tip outer diameter

    This product: Thread outer diameter d 5.0 mm

    The thread outer diameter affects holding power and pilot hole diameter. The listed products have outer diameters of 4.2 to 5 mm, and the cutting tip outer diameter is 3.5 to 4.2 mm. The cutting tip outer diameter is smaller than the thread outer diameter and corresponds to the pilot hole for forming the internal thread. Select the nominal size according to the load conditions, the hole diameter in the upper panel, and the dimensions of the mating member.

  5. 5. Match the Phillips drive size and head style

    This product: Cross recess number #2

    Using a bit that does not match the Phillips drive number increases cam-out (bit slipping out) and damage to the recess. For a flush finish, select a countersunk head, and confirm that the head outer diameter of 10 to 12 mm fits within the seating surface or board surface. Match the bit number to the bits used on site.

  6. 6. Select material and surface treatment for the service environment

    Steel products with trivalent chromate plating are available for indoor use, and SUS410 products with corrosion-resistant treatment are available for outdoor or corrosive environments. SUS410 is a martensitic grade that gains hardness by quenching, and is used for drill screws. However, its corrosion resistance is inferior to austenitic grades such as SUS304.

This guide was written by AI based on the listed products' documents and specification items.

About Tapping screws and all products

Description

Made of stainless steel SUS410 treated with SUS Guard SG surface treatment to strengthen the surface layer. Intended for outdoor and corrosive environments.

Features

  • Made of SUS410
  • Improved corrosion resistance with SUS Guard SG treatment
  • Finned design prevents co-floating

Applications

  • Fastening of wood-based building materials
  • Fastening in outdoor and corrosive environments

FAQ

Q. Can Boardtech Flat Countersunk Stainless Steel 725668 (5×35) be used outdoors or in corrosive environments?
A. It is made of SUS410 and treated with SUS Guard SG to enhance corrosion resistance. It is used for fastening in outdoor and corrosive environments.
Q. What materials is Boardtech Flat Countersunk Stainless Steel 725668 suitable for?
A. It is used for fastening wood-based building materials. The applicable panel thickness is 1.6 mm minimum to 3.2 mm maximum.
Q. What are the dimensions and fastening thickness range of 725668 (5×35)?
A. The thread outer diameter d is 5.0 mm, the overall length L is 35 mm, and the thread length is 22.5 mm. The fastening thickness is 6.6 mm minimum to 22.5 mm maximum. The head outer diameter D is 12 mm, and the head plus cylindrical part length is 5 mm.
Q. Does Boardtech Flat Countersunk Stainless Steel 725668 prevent co-floating?
A. Yes, its finned structure prevents co-floating.
Q. What are the specifications and box quantity of Boardtech Flat Countersunk Stainless Steel 725668?
A. The thread type is 5 threads per inch coarse thread, full thread. The Phillips recess number is #2, the cutting blade outer diameter is 4.2 mm, and the cutting blade length is 7.5 mm. The box quantity is 250 pieces per box.

Written by AI based on the content of the source documents.

Source documents

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