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Boardtech Flat Head 4×28

Model 338313 / ボードテック平サラ / Japan Power Fastening Corporation (Official website)

Steel flat-head tapping screw for fixing wood and wood-based building boards flush. Small type with nominal diameter of 4 mm.

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

Specifications

Thread type 4 TPI coarse thread
Head outer diameter D 10 mm
Head height K 0.8 mm
Cross recess number #2
Thread outer diameter d 4.2 mm
Overall length L 28 mm
Head plus cylindrical part length 4 mm
Thread length 17.2 mm
Cutting edge outer diameter 3.5 mm
Cutting edge length 7.0 mm
Applicable plate thickness minimum 1.6 mm
Applicable plate thickness maximum 2.3 mm
Grip length min. 6.4 mm
Grip length max. 16.5 mm
Box quantity 500 本/箱

ボードテック平サラ model comparison

Compare 9 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 Head height K
338016 5.0 mm 35 mm 5 TPI coarse thread, full thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338027 5.0 mm 45 mm 5 TPI coarse thread, full thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338038 5.0 mm 60 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338049 5.0 mm 70 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338313 This product 4.2 mm 28 mm 4 TPI coarse thread 1.6 mm 2.3 mm #2 10 mm 0.8 mm
338324 5.0 mm 50 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338335 5.0 mm 80 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338346 5.0 mm 90 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm
338357 5.0 mm 100 mm 5 TPI coarse thread, half thread 1.6 mm 3.2 mm #2 12 mm 0.8 mm

How to choose Tapping screws

Points to check when selecting, with the values for this product (338313).

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

    This product: Applicable plate thickness maximum 2.3 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 28 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 4 TPI coarse 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 4.2 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

Equipped with a fin to prevent board float, allowing boards to be installed flush. Thread is 4-thread coarse pitch, with a drill-type cutting tip at the point.

Features

  • Fin prevents board float
  • Cutting tip eliminates need for pilot hole
  • Trivalent chromate finish

Applications

  • Fixing wood-based building materials
  • Fixing wood wool boards and boards

FAQ

Q. What materials can the Boardtech Flat Head 4×28 (Model 338313) be used to fix?
A. It can be used for fixing wood-based building materials and fixing wood wool boards and boards. It is a steel flat-head tapping screw for fixing wood and wood-based building materials flush.
Q. Does the Boardtech Flat Head 4×28 (Model 338313) allow boards to be installed flush, and does it prevent board float?
A. Yes, it has a fin that prevents board float, allowing boards to be installed flush.
Q. Can the Boardtech Flat Head 4×28 (Model 338313) be used without drilling a pilot hole?
A. Yes, the tip has a drill-type cutting edge, so no pilot hole is required. Cutting edge outer diameter is 3.5 mm and cutting edge length is 7.0 mm.
Q. What is the applicable board thickness and fastening thickness range for the Boardtech Flat Head 4×28 (Model 338313)?
A. Applicable board thickness is 1.6 mm minimum to 2.3 mm maximum. Fastening thickness is 6.4 mm minimum to 16.5 mm maximum.
Q. What are the dimensions and Phillips recess number of the Boardtech Flat Head 4×28 (Model 338313)?
A. Thread outer diameter d is 4.2 mm, overall length L is 28 mm, thread length is 17.2 mm, head outer diameter D is 10 mm, head height K is 0.8 mm, and head plus cylinder length is 4 mm. Phillips recess number is #2, and thread type is 4-thread coarse pitch.

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

Source documents

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