Socket Head Cap Screws

January 22, 2017 by · Leave a Comment 

Socket Head Cap Screws

Socket Head Cap Screws

Standard and custom manufactured socket head cap screws.

Standard Socket Head Cap Screws

Sigma distributes quality fasteners – socket head cap screws, metric socket screws, flat head socket screws or button head socket screws. Also known as Allen head cap screws.

Custom and Modified Socket Head Cap Screws

If you specification requires a modified or custom socket head cap screw Sigma will deliver.

ASTM Material Selection Chart B7, B7M, L7, L7M, 660, 718 Inconel, 17-4 ph, MP35N

Available coated, plated and plain.

Heavy Hex Bolts

January 21, 2017 by · Leave a Comment 

Heavy Hex Bolts 

Heavy Hex Head Bolt

Heavy Hex Head Bolt

There are several ASTM bolting specifications that require a heavy hex head – larger than a standard or finished hex head. These specifications include: A193, A320 and A307B. Although A325 and A490 bolts also require a heavy hex head, they refer to Structural Bolts for dimensional specifications, since structural bolts have shorter thread lengths than standard heavy hex bolts. 

Heavy Hex Bolts are used in a varity of OEM equipment and can be manufactured in multiple ASTM grades. 

ASTM Material Selection Chart  

Check Out Heavy Hex Bolts our Bolt Catalog for Sizes and Dimensions.

Nitronic 60 Bolts

January 16, 2017 by · Leave a Comment 

Austenitic Stainless

Nitronic 60 Bolting

Nitronic 60 is truly an all purpose metal. This fully austenitic alloy was originally designed as a wear alloy, and subsequently has good high temperature properties for temperatures around 1800ºF. The oxidation resistance of Nitronic 60 is similar to Type 309 S.S., and far superior to Type 304S.S.

Material Selection

January 12, 2017 by · Leave a Comment 

Suggested materials for use in various temperatures and atmospheres typically encountered in the energy industry


ASTM
Design-
tion
Grade Service
Temp-
erature

Range
Strength and Ductility Suitable
Nuts
(ASTM/
Grade)
Tensile
Min.
psi
Yield Reduction
of Area
R/A
Elong-
tion
EL
Alloy
Type
AISI
ASTM A-193 B7 High Temp.
from 0 –
480ºC
125,000 100,000 50 16 Cr-Mo (4140) A194 Gr 2H
ASTM A-193 B16 High Temp.
from 0 –
550ºC
125,000 105,000 50 18 Cr-Mo V (4140M) A194 Gr 4
ASTM A-193 B7M High Temp.
from 0 –
450ºC
100,000 80,000 50 18 Cr-Mo (4140) A194 Gr 2HM
ASTM A-320 L7 Low Temp.
-100ºC
125,000 105,000 50 16 Cr-Mo (4140) A194 Gr 4 or
A194 Gr 7
ASTM A-193 B5 Up to 815ºC 100,000 80,000 50 16 5% Cr (501) A194 Gr 3
ASTM A-193 B6 Up to 450ºC 110,000 85,000 50 16 13% Cr (410) A194 Gr 6
ASTM A-193 B8 Low Temp.
-200 – 650ºC
75,000 30,000 50 30 18% CR –
8% Ni
(304) A194 B8
ASTM A-193 B8M Low Temp.
-200 – 750ºC
75,000 30,000 50 30 16%Cr –
10% Ni
(316) A194 B8M
ASTM A-320 B8 Low Temp.
-200 – 650ºC
75,000 30,000 50 30 18% Cr –
8% Ni
(304) A194 B8
ASTM A-320 B8M Low Temp.
-200 – 750ºC
75,000 30,000 50 30 16% Cr –
10% Ni
(316) A194 B8M
ASTM A-320 B8T Low Temp.
-200 – 650ºC
75,000 30,000 50 30 13% Cr (321) A194 B8T6
ASTM A-320 B8C Low Temp.
-200 – 650ºC
75,000 30,000 50 30 18% CR –
8% Ni
(347) A194 B8C
ASTM A-193 B8M
class 2
Low Temp.
-200 – 650ºC
125,000 100,000 35 12 16% Cr –
10% Ni
(304) A194 B8C
ASTM A-453 660 High Temp.
up to 750ºC
130,000 85,000 18 15 High Iron
Superalloy
660 (A286) A453 600
ASTM A-564
(cond. 900)
(cond. 1100)
630 Med Temp.
up to 316ºC
190,000
140,000
170,000
115,000
40
45
10
14
Precipitation
Hardening
STST
630 (17-4) A564 630
ASTM B-408 800 –
800H
High Temp.
540ºC – 815ºC
80,000 35,000 25 Incoloy ASTM B408
ASTM B-164 405 High Temp.
to 815ºC
85,000 50,000 15 Monel
ASTM B-164 K500 High Temp.
650ºC – 423ºC
Low Temp.
650 ºC – 253ºC
100,000 70,000 35 Monel
600, 625, 718, x750 ASTM B446, B637 High Temp.
from 850ºC – 1090ºC
100,000 80,000 30 Nickel Superalloy (Inconel)
B, C, X High Temp.
to 850ºC
170,000 115,000 30 Nickel Superalloy (Hastalloy)
Incoloy 925 High Temp.
to – 1000ºC
176,000 120,000 40 24 Nickel Iron Chrome

Stud Bolts

January 12, 2017 by · Leave a Comment 

Stud Bolts

Stud Bolts

Stud Bolts

Stud bolts are available in ASTM Grades B7, L7, B16, B16M, L7M, B8, 660 and B8M; they are also available exotic metals such as Monel, Titanium, Inconel, Alloy 20, and Hastelloy, 17-4PH. These studs are also available with industrial coatings such as SermaGard, Xylan, PTFE, Fluoropolymers and other coatings.

Stud Bolts for Pressure-Temperature Piping

  • Continuous Thread Studs (Fully Threaded Studs)

Stud bolts are threaded end to end and are often used for flange bolting with two nuts on either end.

There are two types of these studs.

  • Type one – usually for general purpose; the length of stud is measured from end to end. Threads are UNRC-2A.
  • Type two – studs for high temperature pressure piping. These studs are made to dimensional standard requirements of ANSI B16.5 the length of this stud is measured from first thread to first thread, exclusive of points. Threads are UNRC-2A for sizes 1 inch and under and 8 UNR-2A for sizes over 1 inch. The length of stud bolt, measured parallel to the axis, is the distance from first thread to first thread. First thread is defined as the intersection of the major diameter of the thread with the base of the point.

Double End Stud Bolts

Tap End Stud Bolts

ASTM Material Selection Chart