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Hex Cap Screws
Hex Cap Screws are an externally threaded mechanical device 1/4" diameter
or larger, with a trimmed hex head and a washer face on the bearing surface.
They come in different grades (or hardnesses). Grade 2-medium or low carbon
steel, a Grade 5 has greater tensile strength than a grade 2 and a Grade 8 which
has a greater tensile strength than a Grade 5. Also available in 18-8 stainless for
corosion resistence and in 316 Stainless which is even more corroision resistence
than 18-8.
NOMINAL OR BASIC PRODUCT DIA.
E
F
G
H
R
LT
BODY DIAMETER
WIDTH ACROSS FLATS
WIDTH ACROSS CORNERS
HEAD HEIGHT
RADIUS OF FILLET
THREAD
LENGTH
FOR SCREW LENGTHS UNDER 6"
FOR SCREW LENGTHS OVER 6"
MAX.
MIN
BASIC
MAX.
MIN.
MIN.
MAX.
BASIC
MIN.
MAX.
MIN.
BASIC
BASIC
1/4
.2500
.2500
.2450
7/16
.438
.428
.505
.488
5/32
.163
.150
.015
.750
1.000
5/16
.3125
.3125
.3065
1/2
.500
.489
.577
.557
13/64
.211
.195
.015
.875
1.125
3/8
.3750
.3750
.3690
9/16
.562
.551
.650
.628
15/64
.243
.226
.015
1.000
1.250
7/16
.4375
.4375
.4305
5/8
.625
.612
.722
.698
9/32
.291
.272
.015
1.125
1.375
1/2
.5000
.5000
.4930
3/4
.750
.736
.866
.840
5/16
.323
.302
.015
1.250
1.500
9/16
.5625
.5625
.5545
13/16
.812
.798
.938
.910
23/64
.371
.348
.020
1.375
1.625
5/8
.6250
.6250
.6170
15/16
.938
.922
1.083
1.051
25/64
.403
.378
.020
1.500
1.750
3/4
.7500
.7500
.7410
1-1/8
1.125
1.100
1.299
1.254
15/32
.483
.455
.020
1.750
2.000
7/8
.8750
.8750
.8660
1-5/16
1.312
1.285
1.516
1.465
35/64
.553
.531
.040
2.000
2.250
1
1.000
1.000
.9900
1-1/2
1.500
1.469
1.732
1.675
39/64
.627
.591
.060
2.250
2.500
1-1/8
1.125
1.125
1.1140
1-11/16
1.688
1.631
1.949
1.859
11/16
.718
.658
.060
2.500
2.750
1-1/4
1.250
1.250
1.239
1-7/8
1.875
1.812
2.165
2.066
25/32
.813
.749
.060
2.750
3.000
1-3/8
1.375
1.375
1.363
2-1/16
2.062
1.994
2.382
2.273
27/32
.878
.810
.060
3.000
3.250
1-1/2
1.500
1.500
1.488
2-1/4
2.250
2.175
2.598
2.480
15/16
.974
.902
.060
3.250
3.500
Mechanical and Material
Requirements for Grades 2, 5 & 8 Hex
Head Cap Screws
Abstract of SAE J429 1985
Grade Designation
Products
Nominal Size Dia., In.
Full Size Bolts, Screws Studs, Sems
Machine Test Specimens of Bolts, Screws and Studs
Surface Hardness
Core Hardness
Grade Identification Marking L
Proof Load (Stress) psi
Tensile Strength (Stress) Min., psi
Yield Strength (Stress) Min., psi
Tensile Strength (Stress) Min., psi
Elongation Min., %
Reduction of Area Min, %
Rockwell 30N Max.
Rockwell
Min.
Max.
2
Bolts, Screws, Studs
1/4 thru 3/4 Over 3/4 to 1-1/2
55,000
33,000
74,000
60,000
57,000
36,000
74,000
60,000
18
18
35
35
--
--
B80
B70
B100
B100
None
5
Bolts, Screws, Studs
1/4 thru 3/4
Over 3/4 to 1-1/2
85,000
74,000
120,000
105,000
92,000
81,000
120,000
105,000
14
14
35
35
54
50
C25
C19
C34
C30
8
Bolts, Screws, Studs
1/4 thru 1-1/2
120,000
150,000
130,000
150,000
12
35
58.6
C33
C39
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Hex Cap Screw PDF file
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