Cut Sheet

F2 © 2003 Thomas & Betts Corporation. Specifications are subject to change without notice. www.tnb.com
Technical Information
Materials
The following materials are used for Steel City Spring Steel
Fasteners:
High Carbon Spring Steel
Spring steel products are manufactured using high carbon,
cold rolled steel, AISI C1075 or equivalent. The final part is
heat treated to give the formed product great resilience and
strength.
Low Carbon Steel
Mild steel products are manufactured using low carbon, cold
rolled steel, AISI C1008 or equivalent. Such parts receive a
zinc or painted finish to protect the finished product.
Finishes
Zinc Phosphate
The Zinc Phosphate finish is per MIL-SPEC-16232, type Z.
This finish includes a Zinc Phosphate base with a
supplementary sealant applied. The finished product will
withstand 24 to 72 hours of saltspray testing in accordance
with ASTM B117.
Pre-Galvanized
Products receiving a Pre-Galvanized finish are Low Carbon
Steel products with a coating of Zinc applied to the Steel
prior to part fabrication. This finish is in conformance with
ASTM A525.
Electro-Galvanized
The Electro-Galvanized finish is a Zinc finish which includes
an electro-plated layer of Zinc and then a Zinc Chromate.
This finish is applied after fabrication and is in conformance
with ASTM B633.
Painted
Some products in the Steel City line receive a Painted finish.
Parts are painted for applications which require alternate
colors to the standard black Zinc Phosphate (such as which
acoustical ceilings).
Load Ratings
The Steel City Spring Steel Fasteners products shown in this
catalog have a load limit based on the following:
Static Load Limit
Such products show the load limit which is based on a safety
factor of 3.
Ultimate Static Load Limit
Such products show the load limit which is the highest load
allowed, with no safety factor.
These Load Limits apply only to catalog numbers which list
such a limit. For both instances, the static load limits apply
only in the orientation described in the catalog or instruction
sheet. These loads apply only to the fastener, the structure to
which it will be attached must be evaluated separately.
Individual Part Numbering System
SSF - H A 1/4 T
12345
1. Catalog numbers will be preceeded by an “SSF” to signify
it is a Spring Steel Fastener part and to give it a unique
catalog number. Non-Spring Steel Fastening items in this
catalog are not preceded by SSF.
2. This portion of the catalog number is a one letter index
based on the category the product falls in. For this example,
“H” is used for the Hangers category. The following is a list
of all the categories and their one letter index:
B – Beams and Purlin
H – Hangers
C – Conduit and Cable
S – Stud Wall and Drywall
T – Acoustical Tee
V – Low Voltage / Telecom
M – Miscellaneous
3. This portion of the catalog number references the style in a
given category. For this example, “A” is used for the rod
and wire hanger with thread impressions.
4. This portion of the catalog number is numeric and will be
based on the size or range of sizes the part will fit. For
example, the SSF-HA1/4T is a hanger that fits b" threaded
rod, so the numeric code would be 1/4.
5. A final letter may be but will not always be included after
the numeric code. This final letter indicates one of the
following:
S – the part has an attached stud
T – the part has a thread impression
A – adjustable
Riveted Combinations
SSF - B V1/4 - A3/8
123 4
1. As with the individual parts, riveted combinations will always
be preceded by an “SSF” to signify it as a Spring Steel
Fastener part.
2. This portion of the catalog number, as with the individual
part, is a one letter index based on the category of the
product. For this example, “B” is used for the Beams and
Purlin category. (See listing above.)
3. Riveted combinations of two parts will have a catalog
number constructed from the two individual catalog
numbers. This portion of the catalog number references the
style and numeric size or range for the first piece of the
combination (see #3 and #4 under the Individual Part
Numbering System). Note that the first part in the
combination will have the same category as the combination.
In this example, V1/4 represents a vertical flange or C-purlin
clip with an individual catalog number of SSF-BV1/4.
4. This portion of the catalog number references the style
and numeric size or range for the second piece of the
combination (see #3 and #4 under the Individual Part
Numbering System). In this example, the A3/8
represents the rod hanger with an individual catalog
number of SSF-HA3/8.
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