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Tapstar M8 x 70

Model TP870 / STP870 / タップスター / Japan Power Fastening Corporation (Official website)

A screw-fastened anchor embedded in concrete and fixed by tightening with an impact driver. Medium-long M8 type.

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

Specifications

Overall length L 70 mm
Metric Thread Length 25 mm
Washer Outer Diameter 18 mm
Nut width across flats 12 mm
Anchor screw diameter 8.5 mm
Maximum thickness of workpiece 20 mm
Drill diameter (pilot hole diameter) 7.5 mm
Embedment depth 35 mm
Pull-Out Load 9 kN
Shear load 14 kN

タップスター model comparison

Compare 13 models in the same series by specification.

Model Anchor screw diameter Drill diameter (pilot hole diameter) Overall length L Embedment depth Pull-Out Load Shear load Maximum thickness of workpiece Metric Thread Length
TP1010 / STP1010 10.5 mm 9.5 mm 100 mm 45 mm 15 kN 22 kN 45 mm 25 mm
TP1060 / STP1060 10.5 mm 9.5 mm 60 mm 45 mm 15 kN 22 kN 5 mm 20 mm
TP1080 / STP1080 10.5 mm 9.5 mm 80 mm 45 mm 15 kN 22 kN 25 mm 25 mm
TP1210 / STP1210 12.4 mm 11.0 mm 100 mm 50 mm 18 kN 37 kN 37 mm 30 mm
TP1212 12.4 mm 11.0 mm 120 mm 50 mm 18 kN 37 kN 47 mm 30 mm
TP1260 12.4 mm 11.0 mm 60 mm 40 mm 10 kN 24 kN 7 mm 20 mm
TP1270 / STP1270 12.4 mm 11.0 mm 70 mm 50 mm 18 kN 37 kN 7 mm 25 mm
TP1290 / STP1290 12.4 mm 11.0 mm 90 mm 50 mm 18 kN 37 kN 27 mm 30 mm
TP645 / STP645 6.5 mm 5.5 mm 45 mm 30 mm 6 kN 7 kN 5 mm 15 mm
TP660 / STP660 6.5 mm 5.5 mm 60 mm 30 mm 6 kN 7 kN 20 mm 20 mm
TP8110 8.5 mm 7.5 mm 110 mm 35 mm 9 kN 14 kN 70 mm 25 mm
TP850 / STP850 8.5 mm 7.5 mm 50 mm 35 mm 9 kN 14 kN 5 mm 20 mm
TP870 / STP870 This product 8.5 mm 7.5 mm 70 mm 35 mm 9 kN 14 kN 20 mm 25 mm

How to choose Screw-in anchors

Points to check when selecting, with the values for this product (TP870 / STP870).

  1. 1. Select the bolt diameter to suit the attachment

    Determine the nominal diameter of the projecting metric thread (e.g., M6 to M12) according to the hole diameter and bracket specification of the attachment. The nominal diameter also changes the anchor thread diameter, pilot hole diameter, and nut width across flats for the tightening tool, so check these together.

  2. 2. Confirm the required pull-out load is met

    This product: Pull-Out Load 9 kN

    The listed products have pull-out loads of 6 to 18 kN. For hanging or ceiling installations, pull-out is the main load direction, so compare the value with the attachment weight and seismic loads including a safety factor. Also confirm the base strength and conditions under which the stated values were measured.

  3. 3. Check base type and embedment depth

    This product: Embedment depth 35 mm

    Holding capacity depends heavily on the base material and embedment depth (30 to 50 mm for listed products). Some examples show a maximum tensile load of about 1 kN in ALC and about 4 kN in lightweight block columns, which are much lower than in concrete, so always verify the compatible bases and the load values for each base.

  4. 4. Install with the specified pilot hole diameter

    This product: Drill diameter (pilot hole diameter) 7.5 mm

    The pilot hole diameter (5.5 to 11 mm for listed products) determines how far the threads bite into the base. A hole that is too large results in insufficient holding capacity, while one that is too small can prevent screw-in or cause damage. Use the drill diameter specified by the manufacturer, and note that even types without a pilot hole may require one depending on the base.

  5. 5. Choose a length that suits the attachment thickness

    This product: Maximum thickness of workpiece 20 mm

    Overall lengths range from 45 to 120 mm, and different lengths are available for the same nominal diameter. After securing the required embedment depth, select the length so that the attachment thickness (up to 5 to 70 mm) and the projecting thread length needed for the nut and washer are both accommodated.

  6. 6. Check shear load and material

    This product: Shear load 14 kN

    For applications with lateral forces, such as fixing brackets to walls, check the shear load (7 to 37 kN for listed products). For outdoor or humid locations, check whether steel-only or stainless steel versions are available and select a material suited to the corrosive environment.

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

About Screw-in anchors and all products

Description

Provides pull-out load of 9 kN and shear load of 14 kN at an embedment depth of 35 mm. Maximum fixture thickness is 20 mm. Available in steel and stainless steel, and height adjustment is possible after installation.

Features

  • Can be installed quickly with an impact driver
  • Edges and finish materials are less likely to crack
  • Height adjustment is possible after installation
  • Anchor can be removed

Applications

  • Equipment installation
  • Building services
  • Temporary construction

FAQ

Q. What kind of fastening can Tapstar M8 x 70 (TP870 / STP870) be used for?
A. It is used for equipment installation, building services, and temporary construction. It is a screw-fastened anchor embedded in concrete and fixed by tightening with an impact driver.
Q. What is the installation method for Tapstar M8 x 70 (TP870 / STP870), and how can it be adjusted after installation?
A. It is installed by tightening with an impact driver. Height adjustment is possible after installation. The anchor can also be removed.
Q. What are the embedment depth, maximum fixture thickness, and pilot hole diameter of Tapstar M8 x 70 (TP870 / STP870)?
A. The embedment depth is 35 mm, the maximum fixture thickness is 20 mm, and the drill diameter (pilot hole diameter) is 7.5 mm.
Q. What are the pull-out load and shear load of Tapstar M8 x 70 (TP870 / STP870), and what material types are available?
A. It provides a pull-out load of 9 kN and a shear load of 14 kN at an embedment depth of 35 mm. It is available in steel and stainless steel.
Q. Are the edges and finish materials of Tapstar M8 x 70 (TP870 / STP870) less likely to crack?
A. Yes, it has the feature of reducing cracking of edges and finish materials.

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

Source documents

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