SAE J995

» Materials » EN Specifications » SAE J995

This SAE Standard covers the mechanical and material requirements for three grades of steel nuts suitable for use in automotive and related engineering applications, in sizes 1/4 to 1-1/2 in, inclusive, and with dimensions conforming with the requirements of the latest issue of ASME B18.2.2 or ASME B18.6.3, as applicable.


SAE J995 Chemical Composition

Nut Grade C max Mn max P max S max
2 0.47 ... 0.12/2/ 0.15*'!
5 0.55 0.30 o.os!4!! 0.15(°!*5!
8 0.55 0.30 0.04 0.05(^!

NOTES :
1. All values are for ladle analysis (percent by weight) and are subject to standard varia- tions for check analysis as given in SAE J409.
2. Resulfurized and rephosphorized material is not subject to rejection based on check analysis for sulfur.
3. If agreed between purchaser and producer, sulfur content may be 0.23 max.
4. Phosphorus content may be 0.13 max for acid bessemer steel only.
5. If agreed between purchaser and producer, sulfur content may be 0.35 max and phos- phorus content may be 0.12 max provided that manganese content is 0.70 min.
6. If agreed between purchaser and producer, sulfur content may be 0.33 max provided that manganese content is 1.35 min.


SAE J995 Mechanical Requirements

SAE J995 PROOF LOAD REQUIREMENTS FOR NUTS!

Nut Grade Nut Size Thread Series
Nut Type
2(4)
1/4 thru 1-1/2 UNC
and BUN
Proof Load Stress, psi (1)
5
1/4 thru 1 UNC
and SUN
Proof Load Stress, psi (1)
5
1/4 thru 1
UNF,12 UN
and Finer Proof Load Stress, psi (1)
5
Over 1 thru 1-1/2
UNC
and SUN Proof Load Stress.psi (1)
5
Over 1 thru 1-1'2
UNF,12UN
and Finer Proof Lo-ad Stress,  psi (1)
8
1/4 thru 1-1J2 UNC
and SUN
Proof Load Stress, psi (1)
8
1/4 thru 11-112 UNF,12UN
and Finer
Proof Load
Stress, psi (1)
Hex - 120 000 109 000 105 000 94 000 150 000 150 000
Hex Aange - 120 000 109 000 105 000 94 000 150 000 150 000
Hex Jam (3) - 72 000 65 000 63 000 57 000 90 000 90 000
Heavy Hex Jam (3) - 72 000 65 000 63 000 57 000 90 000 90 000
Hex Slotted (3) - 96 000 S7 000 84 000 75 000 120 000 120 000
Heavy Hex (3) - 133 000 120 000 116 000 105 000 165 000 150 000
Hex Thick (3) - 133 000 120 000 116 000 105 000 165 000 150 000
Heavy Hex Slotted (3) - 105 000 96 000 92 000 S4 000 132 000 120 000
Hex Thick Slotted (3) - 105000 96000 92:000 S4000 132000 12000-0
Square (2) 90 000 - - - - - -
Note:

1.The proof load in pounds for a nut is computed by multiplying the proof load stress, in psi (Ibf/ink ), for the nut grade, size, thread series, and type, as shown in Table 2, and the stress area, in sq in (in'), for the applicable size and thread series shown in Table 3. (See Appendix A, Table A1 for computed values for some products.)
2.Grade 2 is normally applicable to square nuts only, and square nuts are normally available in Grade 2 only.
3.Proof load stress values for hex jam, heavy hex jam, hex slotted, heavy hex, hex thick, heavy hex slotted, and hex thick slotted nuts are based on requirements for hex nuts. Primarily, each value is derived from the ratio of minimum thickness of the product involved to the minimum thickness of hex or square machine screw nuts and hex nuts (see ASME B18.2.2 and ASME B18.6.3) of the same size—and adjusted to compensate for differences in width across flats, width and depth of slots, and depth of countersink.


SAE J995 Tensile Strength for Bolts, Screws and Studs

Coarse Thread Serles Coarse Thread Serles Fine Thread Serie.a Fine Thread Serles S-Thread
Series
8-Thf1'ad
Series
UNC UNC UNF UNF 8 UN 8 UN
Nominal Size and Threads Per Inch Tensile Stress Area ,sq in Nominal Size and Threads Per Inch Tensile Stress Area ,sq ln Nominal Size and Threads Per Inch Tensile Stress Area sq in
1/4 -20 0.0318 1/4 -28 0.0364 - -
5/16 -18 0.0524 5/16-24 0.0580 - -
318 -16 0.0775 318 -24 0.0878 - -
7116 -14 0.1063 7/16- 20 0.1187 - -
112 -13 0.1419 1/2 -20 0.1599 - -
9/16 -12 0.182 9/16- 18 0.203 - -
5/8-11 0.226 518 -18 0.256 - -
314 -10 0.334 3/4 -16 0.373 - -
7/6 - 9 0.462 7/8- 14 0.509 - -
1-8 0.606 1-12 0.663 1 - 8 0.606
1-1/8- 7 0.763 1-1/8-12 0.856 1-1/8 -8 0.790
1-1/4 -7 0.969 1-1/4 -12 1.073 1-1/4 -8 1.000
1-318-6 1.155 1-3/S - 12 1.315 1-31S -8 1.233
1-112-6 1.405 1-112-12 1.581 1-1/2 -8 1.492

Reference Documents


  • SAE J403
  • SAE J404
  • SAE J1268
  • ASTM F2328
  • ASTM F606
  • ASTM F1470
  • ASME B18.18.2
E-mail Whatsapp