ANSI B18.3-1998 Non-Knurled Socket Head Cap Screws

304 stainless steel inch-series socket head cap screws with smooth, non-knurled heads and 2A threads. Compare 120 full-thread catalogue references.

Selection notes

The supplier catalogue identifies ANSI B18.3-1998 and explicitly describes a non-knurled cylindrical head with 2A threads. Keep this appearance separate from the knurled range. Confirm the required drawing and accepted standard edition; the legacy catalogue reference does not establish compliance with a newer edition.

Catalogue specifications

Expand a group to compare the original inch-series size, thread coverage, tolerance class, marking and item reference. Sizes retain the supplier diameter, threads-per-inch and length notation. Availability is confirmed when quoting.

304 stainless steel / 2#-56 — 8 catalogue items

Catalogue size	Thread / version	Marking	Item reference
2#-56 X 5/32	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370551
2#-56 X 3/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370548
2#-56 X 1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370546
2#-56 X 5/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370550
2#-56 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370547
2#-56 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370545
2#-56 X 9/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370553
2#-56 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370549

304 stainless steel / 4#-40 — 11 catalogue items

Catalogue size	Thread / version	Marking	Item reference
4#-40 X 3/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370559
4#-40 X 1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370556
4#-40 X 5/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370561
4#-40 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370558
4#-40 X 7/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370563
4#-40 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370555
4#-40 X 9/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370564
4#-40 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370560
4#-40 X 3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370557
4#-40 X 7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370562
4#-40 X 1"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370554

304 stainless steel / 6#-32 — 14 catalogue items

Catalogue size	Thread / version	Marking	Item reference
6#-32 X 3/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370571
6#-32 X 1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370567
6#-32 X 5/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370574
6#-32 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370570
6#-32 X 7/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370576
6#-32 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370566
6#-32 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370573
6#-32 X 3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370569
6#-32 X 7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370575
6#-32 X 1"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370565
6#-32 X 1-1/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370577
6#-32 X 1-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370572
6#-32 X 1-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370578
6#-32 X 1-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370568

304 stainless steel / 8#-32 — 17 catalogue items

Catalogue size	Thread / version	Marking	Item reference
8#-32 X 1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370581
8#-32 X 5/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370588
8#-32 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370585
8#-32 X 7/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370591
8#-32 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370580
8#-32 X 9/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370593
8#-32 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370587
8#-32 X 3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370584
8#-32 X 1"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370579
8#-32 X 1-1/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370592
8#-32 X 1-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370586
8#-32 X 1-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370594
8#-32 X 1-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370583
8#-32 X 1-5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370595
8#-32 X 1-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370589
8#-32 X 1-7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370596
8#-32 X 2"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370582

304 stainless steel / 10#-24 — 21 catalogue items

Catalogue size	Thread / version	Marking	Item reference
10#-24 X 1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370599
10#-24 X 5/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370608
10#-24 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370604
10#-24 X 7/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370611
10#-24 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370598
10#-24 X 9/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370614
10#-24 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370607
10#-24 X 3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370603
10#-24 X 7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370610
10#-24 X 1"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370597
10#-24 X 1-1/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370613
10#-24 X 1-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370606
10#-24 X 1-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370616
10#-24 X 1-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370602
10#-24 X 1-5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370617
10#-24 X 1-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370609
10#-24 X 1-7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370618
10#-24 X 2"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370600
10#-24 X 2-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370612
10#-24 X 2-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370619
10#-24 X 2-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370605

304 stainless steel / 1/4-20 — 25 catalogue items

Catalogue size	Thread / version	Marking	Item reference
1/4-20 X 5/16	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370507
1/4-20 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370502
1/4-20 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370497
1/4-20 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370506
1/4-20 X 3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370501
1/4-20 X 7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370510
1/4-20 X 1"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370496
1/4-20 X 1-1/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370512
1/4-20 X 1-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370505
1/4-20 X 1-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370514
1/4-20 X 1-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370500
1/4-20 X 1-5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370516
1/4-20 X 1-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370509
1/4-20 X 1-7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370518
1/4-20 X 2"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370498
1/4-20 X 2-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370511
1/4-20 X 2-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370519
1/4-20 X 2-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370504
1/4-20 X 2-5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370520
1/4-20 X 2-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370513
1/4-20 X 3"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370499
1/4-20 X 3-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370515
1/4-20 X 3-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370508
1/4-20 X 3-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370517
1/4-20 X 4"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370503

304 stainless steel / 5/16-18 — 24 catalogue items

Catalogue size	Thread / version	Marking	Item reference
5/16-18 X 3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370527
5/16-18 X 1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370522
5/16-18 X 5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370531
5/16-18 X 3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370526
5/16-18 X 7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370534
5/16-18 X 1"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370521
5/16-18 X 1-1/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370536
5/16-18 X 1-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370530
5/16-18 X 1-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370538
5/16-18 X 1-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370525
5/16-18 X 1-5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370540
5/16-18 X 1-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370533
5/16-18 X 1-7/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370542
5/16-18 X 2"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370523
5/16-18 X 2-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370535
5/16-18 X 2-3/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370543
5/16-18 X 2-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370529
5/16-18 X 2-5/8	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370544
5/16-18 X 2-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370537
5/16-18 X 3	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370524
5/16-18 X 3-1/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370539
5/16-18 X 3-1/2	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370532
5/16-18 X 3-3/4	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370541
5/16-18 X 4"	Full thread; bright cleaned finish; thread class 2A; non-knurled head	Unmarked	370528

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