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ASTM F1137

ASTM Protective Coatings

ASTM 153/A153M (HDG)
ASTM B766M (Cd+)
ASTM B695 (Mech Zn)
ASTM B840 (ZnCo+)
ASTM B841 (ZnNi+)
ASTM B994 (CoNi+)
ASTM F1136/F1136M (ZnAi+)
ASTM F1137 (Phosphate)
ASTM F1428 (AL+)
ASTM F1941/F1941M
ASTM F2329/F2329M
ASTM F2833
ASTM F3019/3019M

ISO PROTECTIVE COATINGS

ISO 4042
ISO 10683
ISO 15726
ISO 17668

ASTM F1137 Class A/B/C/D Phosphate/Oil Coated Fasteners

Stud Bolts, Nuts, Screws, Threaded Rod & Washers

ASTM F1137 specification covers the basic requirements for six grades of corrosion protection for fasteners. Grade A consists of a heavy zinc phosphate coating with no additional sealer (dry), Grade B consists of a heavy zinc phosphate coating with a dry organic sealer, Grade C consists of a heavy zinc phosphate coating with supplemental dry-to-touch oil type compound, Grade D consists of a heavy zinc phosphate coating with supplemental protective oil type compound,
Grade E consists of a grain-refined microcrystalline zinc phosphate with supplemental oil type compound, and Grade F consists of a manganese phosphate coating with supplemental oil type compound. This specification is intended primarily for fasteners such as nuts, clips, washers, and other ferrous threaded and non-threaded fasteners that require corrosion protection and lubrication. These coatings may or may not have a decorative finish. The values stated in either SI units or inch-pound units are to be regarded separately as standard

ASTM F1137 Coated Fasteners, Bolts, Screws, Nuts & Washers

ASTM F1137 Classifications

ASTM F1137 Requirements

Appearance
Unless otherwise agreed upon between the purchaser and the producer, the color of the protective coating shall be as-coated gray for all grades.
Corrosion Resistance
These coatings shall be capable of withstanding neutral salt spray for the minimum h specified in Table 1 with no base metal corrosion on significant surfaces. Significant surfaces on threaded fasteners are defined as the exposed surfaces when the fasteners are installed in a normal manner (bolt head, nut head, face, etc.). On other surfaces where control of the coating cannot be obtained under normal processing such as holes, recesses, threads, etc., the above requirements do not apply.
Thread Fit
The maximum thickness of coating which may be applied to threads on threaded products is limited by the basic thread size . Threads may be produced undersize/oversize (before coating) to accommodate the coating thickness, providing the finished product (after coating) meets all specified mechanical properties. All undersize/oversize must be within permissible limits as agreed upon between the supplier and the purchaser.
Dry-to-Touch
ASTM F1137 Grades B and ASTM F1137 Grade C shall be evenly coated and dry-to-touch such that when held with filter paper or equivalent and applying hand pressure for 5 to 10 s, there shall be no visible staining of the filter paper when viewed without use of supplementary magnification. For referee purposes, this test shall be performed using a force of 10 N as measured with a load-indicating gage.

ASTM F1137 Inspection

Samples shall be taken in accordance with Practice F1470.
Referee Inspection
The following referee thread inspection procedure may be utilized if the specified “go” gage binds on the screw.
Bolt or Screw
Assemble a phosphate-plated test nut with a 2B or 6H class thread down the full length of the thread.
Nut
Assemble a phosphate-plated test bolt or screw with a 2A or 6g class thread for a minimum of one diameter through the nut. The test nut or screw/bolt must run freely for the total length without binding.