U-Bolt (Stainless Steel)

Specifications

How to choose Fastening Parts

Points to check when selecting, with the values for this product (U-Bolt (Stainless Steel)).

1. 1. Select a nominal diameter suited to the substrate and load

   The nominal diameter is the outer diameter of the thread. A larger diameter increases pull-out and shear resistance, but it must pass through the hole in the mounted item. Listed examples are 4 mm, 5 mm and 6 mm; determine the size by matching the hole diameter of the bracket and the weight of the suspended equipment.

2. 2. Determine the overall length from item thickness plus required embedment

   The overall length L of listed products is 35 to 80 mm. The remaining length after subtracting the thickness of the mounted item (band or bracket) is the embedment depth into the substrate, so for soft substrates such as ALC panels choose a length that secures sufficient embedment. Also confirm that the screw does not pass through the back of the substrate thickness.

3. 3. Check the thread length engaging the substrate

   The thread length ℓ of listed products is 30 to 55 mm, and this threaded portion provides the holding power. Even with the same overall length, a short threaded section means fewer threads engage the substrate depending on the thickness of the mounted item. Estimate the effective engagement length together with the thickness of the mounted item.

4. 4. Choose the head shape according to the mounting hole and finish

   Flat heads sink into countersunk holes to give a flush surface. Truss heads have a large, low profile and suit holding down brackets or bands with holes that are not countersunk, using their wide bearing surface. Decide based on the hole shape of the mounted item and whether the head may protrude.

5. 5. Verify bearing surface and clearance using head diameter and height

   Head diameter D is in the range of 7 to 12 mm and head height H is 2 to 3.5 mm. If the head diameter is not sufficiently larger than the hole in the mounted item, it cannot hold securely, and head height affects interference with surrounding members or covers. For brackets with slotted holes, confirm that the head diameter reliably exceeds the slot width.

6. 6. Check material and surface treatment for outdoor or humid environments

   This product: Material SUS304J3

   Corrosion is a concern for applications outdoors, such as downspout bands. Check the body material (such as stainless steel) and whether anti-corrosion treatment is applied, and watch for galvanic corrosion where the fastener contacts dissimilar metals in the mounting bracket. For structural applications where certified products are specified, as with structural screws, use products that conform to the certified specification.

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

About Fastening Parts and all products

Description

U-bolts made of SUS304J3, with nuts and flat washers in SUS304. Each piece includes 4 flat washers and 4 hexagon nuts. Made to order, so orders cannot be cancelled after placement. Unit price tiers apply based on quantity.

FAQ

Q. Which pipes or equipment can the N2 Series stainless steel U-bolts be used with?

A. The applicable diameter range is 17.3 to 114.3 mm. Typical applications are pipe fixing and equipment mounting.

Q. What are the material and thread sizes of the N2 Series stainless steel U-bolts?

A. The U-bolts are made of SUS304J3, and the nuts and flat washers are made of SUS304. Thread sizes available are M6, M8, and M10.

Q. Do the N2 Series stainless steel U-bolts include nuts and washers?

A. Yes. Each piece includes 4 flat washers and 4 hexagon nuts.

Q. Are same-day shipments available for the N2 Series stainless steel U-bolts?

A. Yes, same-day shipping is available. It applies to orders placed by 5:00 PM.

Q. Can the N2 Series stainless steel U-bolts be cancelled after ordering?

A. No. As these are made-to-order products, orders cannot be cancelled after placement.

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

Source documents

• Catalog スプリングネット 製品カタログ（ページ抜粋） 43 pages Open page 31
  Found on: https://www.samini.co.jp/catalog_list/