Page 1 of 2 Fastenal Product Standard REV-01

Date: May 19, 2017

TRS.HWSL.IN.Z

Thread Rolling Screw, Hex Washer Slotted, Indented, Zinc The information below lists the required dimensional, chemical and physical characteristics of the products in this purchase order. If

the order received does not meet these requirements, it may result in a supplier corrective action request, which could jeopardize your

status as an approved vendor. Unless otherwise specified, all referenced consensus standards must be adhered to in their entirety.

Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.

#4 .188 .181 .060 .049 .243 .225 .019 .011 .039 .031 .042 .025

#6 .250 .244 .093 .080 .328 .302 .025 .015 .048 .039 .053 .033

#8 .250 .244 .110 .096 .348 .322 .031 .019 .054 .045 .074 .052

#10 .312 .305 .120 .105 .414 .384 .031 .019 .060 .050 .072 .057

#12 .312 .305 .155 .139 .432 .398 .039 .022 .067 .056 .103 .077

1/4 .375 .367 .190 .172 .520 .480 .050 .030 .075 .064 .101 .083

5/16 .500 .489 .230 .208 .676 .624 .055 .035 .084 .072 .134 .100

3/8 .562 .551 .295 .270 .780 .720 .063 .037 .094 .081 .168 .131

1/2 .750 .735 .400 .367 1.040 .960 .085 .050 .106 .091 .190 .165

Size

A

Width Across

Flats

H

Head Height

B

Washer

Diameter

U

Washer

Thickness

J

Slot Width

T

Slot Depth

Page 2 of 2 Fastenal Product Standard REV-01

Date: May 19, 2017

TRS.HWSL.IN.Z

P C

Point

Diameter

Diameter of

Circumscribing

Circle (Thread)

Max. Max. Max.

#4 40 0.1120 0.0900 0.1145

#6 32 0.1380 0.1110 0.1410

#8 32 0.1640 0.1370 0.1670

#10 24 0.1900 0.1530 0.1940

#10 32 0.1900 0.1630 0.1930

#12 24 0.2120 0.1790 0.2200

1/4 20 0.2500 0.2060 0.2550

5/16 18 0.3125 0.2640 0.3180

3/8 16 0.3750 0.3200 0.3810

1/2 13 0.5000 0.4160 0.5080

Nominal

Screw Size

Basic

Screw

Diameter

Thread

per Inch

Specification Requirements:

• Dimension, Material &

Performance: ASME B18.6.3

• Drive Style: Indented Hex Washer Slotted Head

• Finish: Fe/Zn 3AN per ASTM F1941/F1941M and waxed

• Hydrogen Embrittlement: Baking to relieve internal hydrogen embrittlement is

mandatory and shall be performed after electroplating

prior to the application of conversion finish where baking

temperatures can damage the conversion film. Baking may be

allowed after conversion finish provided temperature does not

alter performance. Part temperature shall reach 375°F to

400°F (190°C to 204°C) for a minimum of 4 hours, as soon as

practical after plating.

Hydrogen Embrittlement test results shall be maintained and

supplied to Fastenal upon request.