Following my previous features Types of Staples – Explained and Brad and Pins – Explained we shall conclude with Types of Nails commonly used in this industry.
I’ll just refresh the types of finish most commonly found on fasteners:
Bright – the nails do not have any coating and will be susceptible to corrosion and therefore shouldn’t be used outdoors or in damp environments. Used mainly in pallet and case manufacturing where the corrosion isn’t a major concern.
Electro Galvanised – the nails are covered in a coating of zinc which gives a degree of protection against the onset of the rusting process.
Introducing Hot Dipped Galvanised – nails have in this process been placed in a bath of molten zinc giving a greater covering of zinc and therefore more resistance when being used in damp environments. This is not used on staples, brads or pins.
Stainless Steel – the nail has in this case a full resistance to corrosion and is ideal for use outdoors. Stainless Steel is also used in woods containing tannin because the tannin will react with the ordinary Bright or Galv finish and discolour very quickly.
The types of nails commonly found in nailers are:
Strip Nails – Sometimes referred to as stick nails. The nails are set at an angle and are held together most commonly with paper tape or plastic.
Paper tape nails are normally set at an angle of 34 degrees and have a clipped head so the nail can neatly sit side by side in the strip. This nail is found in most 1st Fix Air Nailers and gas nailers and also the Stanley Battery BF33-2 previously featured.
Plastic collation is generally set at an angle of 22 degrees and in this case has a full round head. Because of the full round head the plastic collation holds the nails apart so they can be held in a strip format. These tend to be air operated nailers and are ideally used in stock fencing (Nailing rails to posts) where the full round head can give that extra holding power.
Strip Nails generally vary in thickness from 2.8 – 3.4mm and length 50mm – 100mm.
Coil Nails – As it say’s on the tin the nails are wound in a coil formation and are most commonly found in air operated coil nailers. Up to the size of 50mm (2”) they are either the conical or flat type, above this size the coils are all wound in a flat collation. What I mean here (explained in the video) is the nails are wound evenly to create a flat topped coil or are wound to create a domed or conical profile towards the centre of the coil. In a nutshell your nailer will take one type or the other. (excepting some new models that can adjust to take both) The reason it is critical to get the right type of coil is the wire holding the nails together is in differing positions and causes all sorts of problems and jamming!!
Well I’ll finish now – have a great weekend……next week we’ll be doing a tool review on the Senco Fusion nailer…..no air………no gas……..no bulls..t ………..watch this space!!!
Don't overlook the need for safety gloves when working. These are available via our Amazon Associate Programme where you get the best price and we gain a small commission.
Get your personalised weekly Tool and Industry News here!
Get yours here:
Take Care,
Now, get your free copy of '3 Ways to make your AirTool Live Longer'
Nails are an integral part of modern wood frame construction structural connections such as framing, floors, walls, and roofs. These are the building blocks needed for a structure prior to completing a proper building envelope. For many, important information regarding nails and their use may need refreshing and updating.
By definition a nail is:
Most nails made today are formed from wire and have three physical features: the head, the shank, and the point (Figure 1).
ASTM International standard F1667, Standard Specification for Driven Fasteners: Nails, Spikes and Staples, provides information on materials of fabrication, dimensions and tolerances, coatings, style, strength requirements, and other information.
The American Wood Council (AWC) publications—National Design Specification® for Wood Construction (NDS®), Wood Frame Construction Manual (WFCM), and Special Design Provisions for Wind & Seismic (SDPWS)—incorporate specific information regarding nails for designers and subsequently are referenced in sections of the building codes. These AWC documents provide information on design values for nails regarding:
There are two primary methods for the development of building designs: prescriptive and performance.
ASTM F1667 and the AWC documents tie into the International Building Code (IBC®) and International Residential Code (IRC®). There are multiple tables in the IBC and the IRC that provide prescriptive fastening requirements. These tables include but are not limited to those listed in Table 1.
IBC IBC IRC Fastening Schedule 2014.10.1 R602.3(1) Hardboard Siding 2308.6.3(5) R602.3(2) Underlayment Application 1507.1.1(2) & 1507.1.1(3) R905.1.1(2) Wood Shingle and Shake 1507.8 R905.7.5(2) Table 1 – There are multiple tables in the IBC and the IRC that provide prescriptive fastening requirements. Some are included here.Designers have alternatives to the prescriptive requirements called out in the codes as well. These alternatives, “performance,” may be developed by using the design information provided in the AWC documents in conjunction with competent engineering design, accurate fabrication, proper supervision of construction, and use of recognized alternative materials such as those listed in code evaluation reports (Figure 2).
One of the most prominent code evaluation reports for nails is the ICC Evaluation Services report ESR-1539 http://www.icc-es.org/reports/pdf_files/ESR-1539.pdf, of which ISANTA is the report holder.
Whether a designer uses prescriptive requirements or independent design, there are a number of engineering aspects that must be considered when specifying the proper nails for the applications.
Nail sizes are typically described with reference to dimensions and style. Dimensionally, references are made to length, nominal shank diameter, and, where necessary, head diameters.
Example: 2½ x 0.131 in., where 2½ in. is the length of the shank and 0.131 in. is the nominal shank diameter.
Often described in terms taken from ASTM F1667, common nails, box nails, and cooler nails are referenced in the prescriptive requirements of the IRC and IBC. Although common, box, and cooler nails are similar in shape, they differ dimensionally. Table 2 shows the most frequently referenced sizes of these nail types. ASTM F1667 also references these nails with terms such as 6d, 8d, 10d, 12d, etc.
Table 6 Type I, Style 4A Box Nails Table 10 Type I, Style 7 Cooler Nails Table 15 Type I, Style 10 Common Nails L x D – head diameter L x D – head diameter L x D – head diameter 6d 2 x 0.099 – 0.266 17/8 x 0.092 – 0.250 2 x 0.113 – 0.266 8d 2½ x 0.113 – 0.297 23/8 x 0.113 – 0.281 2½ x 0.131 – 0.281 10d 3 x 0.128 – 0.312 27/8 x 0.120 – 0.297 3 x 0.148 – 0.312 12d 3¼ x 0.128 – 0.312 ================ 3¼ x 0.148 – 0.312 Table 2 – Nail comparisons by designation.Note that a 6d box ≠ 6d cooler ≠ 6d common nail. This applies to other sizes and other styles where the “d” designation is referenced. Always verify that the dimensions of the nail are referenced and the proper-size nail for the application is being used.
Nails listed in ASTM F1667 are, with a few exceptions, full, round, and concentric to the shank. Tolerances are provided for hand-driven nails. There are provisions that allow nails manufactured for use in power-fastening tools to have other head shapes (D-head, offset round, etc.) and to be manufactured to the tolerances specified by the manufacturer. See Figure 3.
Nails are typically referenced as smooth-shank or deformed-shank (ring and screw). See Figure 4.
For the various types of nails referenced in ASTM F1667, dimensions and tolerances are addressed as follows:
Most nails used in construction are made of carbon steel and, to a lesser extent, stainless steel. Carbon-steel nails are made of low-carbon, medium-low carbon, or medium-high carbon steel. Stainless steel nails are made of 302, 304, 305, or 316 stainless, with the most commonly used grades being 304 and 316. Other materials, such as copper, aluminum, or brass are called out for specialized applications.
The codes specify that nails used in preservative-treated wood, fire-retardant wood, and a variety of roofing materials (asphalt shingles, durable wood shingles, tile, etc.) have specific requirements with regard to corrosion resistance. Hot-dip galvanization per ASTM A153 (Standard Specification for Zinc Coating [Hot Dip] on Iron and Steel Hardware) Class D (1oz./ft²) coverage or stainless steel is referenced in a number of locations in the codes.
In addition to the code requirements, a designer needs to consider other applications and environmental factors when determining the proper material and coating compatibility needs in a design. Factors such as outdoor exposure to moisture or salt spray or attachment with dissimilar metals may compromise a fastener without the proper corrosion protection.
Three mechanical properties of nails are called out in ASTM F1667: ductility, tensile strength, and bending yield strength.
Of these three properties, the most critical for the designer is the bending yield strength.
Within ASTM F1667 and the NDS, there are provisions for minimum Fyb requirements for nail shank diameters (D):
These minimum requirements cover most of the nail diameters used in wood-frame construction.
The bending yield strength of the nail is used in determining the mode of failure in a connection when subjected to lateral loads due to wind or seismic loading. There are six primary modes of failure in a single shear connection. These are depicted in Figure 5 and are referenced in Appendix I of the NDS and in ESR-1539’s Appendix A.
Additionally, equations used to calculate the reference lateral design values for each mode of failure are available in Section 12.3 of the NDS and in Appendix A of ESR-1539. These equations take into consideration nail diameter, nail-bending yield strength, the dowel-bearing strength of both the side member and the main member (a function of wood specific gravity), and length of the nail in both the side member
and main member.
Nail withdrawal capacity (lb./in.) is the ability of a nail to resist withdrawal when driven into wood or wood products. The capacity is a function of the nail size, shank configuration, material of construction, and wood’s specific gravity. In a connection, the withdrawal is based on the penetration of the nail into the main member, not the top or side member. The main member is considered to be the member that holds the point of the nail when driven (Figure 6).
In the 2018 NDS, significant changes were made with regard to nail withdrawal. These changes consist of the following:
Withdrawal values for RSRS and PFRS nails are based on the length of ring penetration of the nail into the main members. Withdrawal values for all other nails are based on the total length of the nail penetration into the main member (Figure 7).
For more information on withdrawal values and changes to the NDS, please see https://tinyurl.com/yd3xaqwv.
Nail head pull-through is when the uplift forces on the side member in a nailed connection exceed the capacity of the member to remain in place, thus causing the nail head to pull through, separating members in the connection. In this case, the nail will remain driven into the main member of the connection (Figure 8).
With the publication of the 2018 NDS, pull-through values for round-head nails have been developed. Pull-through in a nailed connection is based on the side member thickness, side member specific gravity, and nail head perimeter. Tabulated values are available in NDS Table 12.2F, Head Pull-Through, WH, along with provisions on how to calculate pull-through values. A partial list of the values for nonstructural 1 or marine-grade plywood is shown in Table 3.
When published in mid-2018, the “NDS With Commentary” will address pull-through for other head shapes, allowing a designer to calculate pull-through for these other head shapes.
With the addition of the nail pull-through values, the 2018 WFCM Table 3.10, “Roof Sheathing Attachments Requirements for Wind Loads,” now addresses fastener uplift capacity for roof sheathing. These values are based on the minimum values obtained from nail withdrawal or head pull-through calculations.
In a building design, there are a number of factors to take into consideration when using nails. These include but are not limited to nail size, nail materials of construction, corrosion protection requirements, and the types of materials the nail is driven into.
Nail size has a direct effect on the shear, withdrawal, and pull-through capacity in a connection. The material used to make a nail also determines the strength of the connection in terms of the ability to withstand shear loads, along with withdrawal and pull-through. Materials and coatings are also important factors in determining the levels of corrosion protection required in the codes or under various environmental conditions.
With various references available—from published standards to evaluation reports—designers have multiple resources at hand to help in the design process, thus ensuring safe and reliable designs.
American Wood Council. National Design Specification for Wood Construction, 2018 Edition.
American Wood Council. Wood Frame Construction Manual, 2018 Edition.
American Wood Council. Special Design Provisions for Wind & Seismic, 2015 Edition.
ASTM International. (ASTM F1667), 2017 Standard Specification For Driven Fasteners: Nails, Spikes and Staples. ASTM International, West Conshohocken, PA.
International Code Council. International Residential Code® for One- and Two-Family Dwellings (IRC®) and International Building Code® (IBC®). Washington, D.C.
ICC Evaluation Services. ESR-1539, Brea, CA.
Rick Allen is the technical resource manager at the International Staple, Nail and Tool Association (ISANTA) in Chicago, Illinois. His responsibilities include managing the technical aspects of ISANTA, and updates to ESR-1539. He is the subcommittee chair of ASTM F16.05 on driven fasteners, vice-chair of the Roofing Industry Committee on Weather Issues (RICOWI), and a member of the AWC Wood Design Standards Committee.