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Home
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Hex Bolts and Cap Screws
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Grade 8 Hex Cap Screw, Plated
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1/4-20 X 3 3/4 J429 GRADE 8 HEX CAP SCREW, PLATED
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1/4-20 X 3 3/4 J429 GRADE 8 HEX CAP SCREW, PLATED
Item #:
HHP80250375
1/4-20 X 3 3/4 J429 GRADE 8 HEX CAP SCREW, PLATED
$0.60289/EA
Quantity
Price
Quantity
Price
1
$0.60289/ EA
180
$0.5646/ EA
720
$0.50343/ EA
3230
$0.33164/ EA
Qty
In Stock
Add To Cart
Technical Data
Product Specification
Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications
Product Specification
Diameter
1/4
Length
3 3/4
Thread Length
0.7500
Grades
Grade 8
Finish
Plated
Weight
0.0559,
Governing Standards
Governing Standards
Grade 8
SAE J429
Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.1
Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A
Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.
Grade 8 Material Marking
Mechanical Properties
Mechanical Properties
Grade 8
Medium Carbon Steel, Heat Treated, Quenched and Tempered
Per SAE J429 2014-05
Diameter
Full Size Proof Load
Yield Strength
Tensile Strength
Elongation
Reduction in Area
Core Hardness
psi
Min psi
Min psi
Min %
Min %
Rockwell
1/4 thru 1 1/2"
120,000
130,000
150,000
12
35
C33 to C39
Chemical Properties
Chemical Properties
Grade 8
Per SAE J429 2014-05
Grade
Material
Carbon
Phosphorus
Sulfur
Boron
Tempering Temperature
% by weight
% by weight
% by weight
% by weight
Min
8
Carbon (1) Steel with additives (e.g. Boron (2) or Cr, or Mn)
0.25-0.55
0.025 max
0.025 max (5)
0.003
800F
Medium Carbon Steel
0.25-0.55
0.025 max
0.025 max (5)
800F
Alloy Steel (3,4)
0.25-0.55
0.025 max (6)
0.025 max (6)
800F
1. For steels of these types there shall be sufficient hardenability to ensure a microsructure consisting of approximately 90% martensite (refer Table 3) in the core of threaded sections of the fasteners after hardening and quenching and before tempering.
2. When boron is added the limits shall be 0.0005 % to 0.003 %.
3. Alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0.30 %, nickel 0.30 %, molybdenum 0.20 %, vanadium 0.10 %, manganese 1.65%. Where elements are specified in combinations of two, three, four, or five and have alloy contents less than those given above, the limit value to be applied for steel class determination is 70 % of the sum of the individual limit values shown above for the two, three, four or five elements concerned.
4. For steels of these types there shall be sufficient hardenability to ensure a microsructure consisting of approximately 90% martensite (refer Table 3) in the core of threaded sections of the fasteners after hardening and quenching and before tempering.
5. For studs only, sulfur content may be 0.13% maximum.
6. Alloy steel used to make fasteners by hot forging or machining may have a maximum content by weight of 0.030% P (phosphorus) and 0.040% S (sulfur).
Dimensional Specifications
Dimensional Specifications
Grade 8
Per ASME B18.2.1-2012
Nominal Diameter
UNC
UNF
E
F
G
H
J
LT
Y
Body Diameter
Width Across Flats
Width Across Corners
Head Height
Wrench Height
Thread Length
Transition Length
Max
Min
Basic
Max
Min
Max
Min
Basic
Max
Min
Min
Lengths up to 6"
Lengths > 6"
Max
1/4
0.25
20
28
0.25
0.2405
7/16
0.438
0.428
0.505
0.488
5/32
0.163
0.15
0.106
0.75
1
0.25
5/16
0.3125
18
24
0.3125
0.3065
1/2
0.5
0.489
0.577
0.557
13/64
0.211
0.195
0.14
0.875
1.125
0.275
3/8
0.375
16
24
0.375
0.369
9/16
0.562
0.551
0.65
0.628
15/64
0.243
0.226
0.16
1
1.25
0.312
7/16
0.4375
14
20
0.4375
0.4305
5/8
0.625
0.612
0.722
0.698
9/32
0.291
0.272
0.195
1.125
1.375
0.357
1/2
0.5
13
20
0.5
0.493
3/4
0.75
0.736
0.866
0.84
5/16
0.323
0.302
0.215
1.25
1.5
0.385
9/16
0.5625
12
18
0.5625
0.5545
13/16
0.812
0.798
0.938
0.91
23/64
0.371
0.348
0.25
1.375
1.625
0.417
5/8
0.625
11
18
0.625
0.617
15/16
0.938
0.922
1.083
1.051
25/64
0.403
0.378
0.269
1.5
1.75
0.455
3/4
0.75
10
16
0.75
0.741
1 1/8
1.125
1.1
1.299
1.254
15/32
0.483
0.455
0.324
1.75
2
0.5
7/8
0.875
9
14
0.875
0.866
1 5/16
1.312
1.285
1.516
1.465
35/64
0.563
0.531
0.378
2
2.25
0.556
1
1
8
14
1
0.99
1 1/2
1.5
1.469
1.732
1.675
39/64
0.627
0.591
0.416
2.25
2.5
0.625
1 1/8
1.125
7
12
1.125
1.114
1 11/16
1.688
1.631
1.949
1.859
11/16
0.718
0.658
0.461
2.5
2.75
0.714
1 1/4
1.25
7
12
1.25
1.239
1 7/8
1.875
1.812
2.165
2.066
25/32
0.813
0.749
0.53
2.75
3
0.714
1 3/8
1.375
6
12
1.375
1.363
2 1/16
2.062
1.994
2.382
2.273
27/32
0.878
0.81
0.569
3
3.25
0.833
1 1/2
1.5
6
12
1.5
1.488
2 1/4
2.25
2.175
2.598
2.48
15/16
0.974
0.902
0.64
3.25
3.5
0.833
All dimensions are in inches.
Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″