FF-C-450F
document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless
a specific exemption has been obtained
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheets and military standards. In the event of any conflict between requirements of this
specification and the specification sheets and military standards, the latter shall govern.
3.1.1 Type I, class 1 clamps (see MS16842). Materials for saddles, bolts, and nuts shall be carbon steel, the
properties of which shall withstand, without distortion, the torque test of 4.4.2. Saddles shall be made of steel
forgings for wire rope sizes up through 2 inches inclusive; of steel castings for wire rope sizes larger than 2 inches.
3.1.2 Type I, class 2 clamps (see MS16842). Material for bolts and nuts shall be carbon steel, the properties of
which shall withstand, without distortion, the torque test of 4.4.2. Saddles shall be made of malleable iron, 32510, in
accordance with ASTM-A47/A47M.
3.1.3 Type II clamps (see FF-C-450/1). Material for bolts, saddles, and nuts shall be carbon steel the properties of
which shall withstand, without distortion, the torque test of 4.4.2. Saddles shall be made of forged steel.
3.1.4 Type III clamps (see MS51868). Material for Class 1 clamps and Class 2 saddles and nuts shall be carbon
steel. Class 2 bolts shall be SAE-J429, grade 5 steel or better. The properties of all type III clamps shall withstand,
without distortion, the torque test of 4.4.2. Class 1 saddles with integral L-shaped bolts and Class 2 saddles shall be
forged.
3.1.5 Type IV clamps (see MS16843). Material for type IV clamp bodies shall be of forged steel 1035 to 1040.
The mating hexagon nut shall also be made of 1035 to 1040 steel.
3.2 Bolts.
3.2.1 Bolt threads. Thread series of bolts after hot dip zinc (galvanized) coating, electrodeposited zinc coating,
mechanically deposited zinc coating, or electrodeposited cadmium plating shall be Unified Coarse (UNC) Class 2A in
accordance with FED-STD-H28.
3.2.2 Thread methods. Bolt threads may be rolled or cut at the option of the manufacturer. Threads shall not be
recut or rerolled after hot dip zinc (galvanized) coating, electrodeposited zinc coating, mechanically deposited zinc
coating, or electrodeposited cadmium plating.
3.3 Nuts.
3.3.1 Nut threads. Nut threads shall be of the same series and class as the bolts on which they are to be used
(see 3.2.1). Hot dip zinc (galvanized) coated nuts shall be tapped after coating except those galvanized nuts used
with type III, class 2 clamps whose threads shall be cut oversize prior to being hot dip (galvanized) coated and then
recut after coating to maintain a proper fit with the mating bolt. Electrodeposited threaded nuts shall not be recut after
coating and plating.
3.3.2 Type. Nuts for types I, II, and III clamps shall be heavy, hexagon, nuts or flat nuts in accordance with ASME-
B18.2.2 except nuts for type I, class 2 (malleable iron) saddles shall conform to the hexagon, flat nut of ASME-
3.4 Dimensions. Dimensions and weights of wire rope clamps shall see 3.1, as applicable, and as otherwise
specified herein. Dimensional symbols are identified in see 3.1. Clamp sizes (see 3.1) are designated by the
diameter of the wire rope with which they are used.
3.5 Construction.
3.5.1 Configuration. Configuration details of clamp components may be to the contractor's design; however, the
clamps assembled shall be specified in FF-C-450/1, MS16842, MS16843, and MS51868, and shall conform to the
applicable description of this specification (see 6.2).
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