FF-S-85D
NASM51110
- Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Shank
Drilled for Cotter Pin, Steel, Corrosion Resisting
Passivated, UNF-2A
NASM90725
- Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Steel,
Grade 5, Cadmium Plated, UNC-2A
NASM90726
- Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Steel,
Grade 5, Cadmium Plated, UNF-2A
(Application for copies of NASC publications should be addressed to the
Aerospace Industries Association, 1250 Eye Street, NW, Washington, DC 20005.)
3.
REQUIREMENTS
3.1 Material. Unless otherwise specified in the invitation for bids, contract
or order, cap screws shall be made of materials specified in 3.1.1 through 3.1.5
and Table IA (see 6.2).
3.1.1 Low carbon steel. Unless otherwise specified (see 6.2) grade 2 cap
screws shall be made of low carbon steel as shown in Table I. The chemical
composition shall contain a maximum of 0.28 percent carbon, a maximum of 0.04
percent phosphorus, and a maximum of 0.05 percent sulfur.
3.1.2 Medium carbon steel. Grade 5 cap screws shall be made of medium carbon
steel as shown in Table I and conforming to the requirements of SAE-AMS-STD-66.
The chemical composition shall contain 0.28 to 0.55 percent carbon, a maximum of
0.04 percent phosphorus and a maximum of 0.05 percent sulfur. It shall be
quenched and tempered at a minimum temperature of 800°F. Cap screws of the
following standards shall be made in accordance with the specification: MS35295,
NASM51095, NASM51096, NASM51105, NASM51106, NASM90725, and NASM90726.
Alloy steels.
3.1.3
3.1.3.1 Alloy steel, Grade 8. Grade 8 cap screws shall be made of alloy steel
as shown in Table I and conforming to the requirements of SAE-AMS-STD-66. The
chemical composition shall contain 0.28 to 0.55 percent carbon, a maximum of 0.04
percent phosphorus, and a maximum of 0.05 percent sulfur. It shall be hardened
sufficiently to a minimum oil-quench Rockwell hardness of C45 at the center of the
threaded section, one diameter from the end of the cap screw. Cap screws of the
following standards shall be made in accordance with the specification: MS35302,
MS51107, and MS51108.
TABLE I.
Grades and Mechanical Properties of Steel Cap
Screws 1/4 thru 3 Inch Diameters
Hardness
Tensile
Strength
Proof Load
Nominal Size
Rockwell
Grade
Brinell No.
p.s.i. (Min)
p.s.i.
Dia., Inch
Designation
Min
Max
Min
Max
2
1/4 thru 3/4 *
55,000
74,000
149
241
B80
B100
Over 3/4 thru 1-1/2**
33,000
60,000
121
241
B70
B100
1/4 thru 1
85,000
120,000
255
321
C25
C34
5
Over 1 thru 1-1/2
74,000
105,000
223
285
C19
C30
Over 1-1/2 thru 3
55,000
90,000
183
235
B90
C21.7
8
1/4 thru 1-1/2
120,000
150,000
302
352
C33
C39
Over 1-1/2 thru 3
85,000
120,000
302
352
C33
C39
9
1/4 thru 1-1/2
130,000
170,000
336
386
C36
C45
(Option Alloy)
* 6" and less in length.
** All diameters if length exceeds 6".
5
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