SEELBOLTS

®

High-pressure, self-sealing bolts

SEELBOLTS® are designed to seal out air, water, lubricants and other liquids or gaseous contaminants. SEELBOLTS® are available in

many standard thread sizes and with optional sealing materials. They can also be supplied with either NYLOK® self-locking Aero-Patch™

or Aero-Pellet™, a black oxide, painted heads, or in a captivated (KAPTO-SKREW®) configuration.

LENGTHS

THREAD

P

H

Flats

Clear. Hole‡

Up to 1" + 0 – 1/32

SIZE

NOM.

MAX.

MAX.

Min.

Max.

1" to 2" + 0 – 1/16

1/4-28UNF-2A

.510"

.163"

.440"

.265"

.269"

3/8", 1/2", 5/8", 3/4"

1/4-20UNC-2A

.510"

.163"

.440"

.265"

.269"

3/8", 1/2", 5/8", 3/4"

5/16-24UNF-2A

.580"

.211"

.502"

.332"

.336"

1/2", 5/8", 3/4", 7/8"

5/16-18UNC-2A

.580"

.211"

.502"

.332"

.336"

3/8", 1/2", 5/8", 3/4", 7/8"

3/8-24UNF-2A

.650"

.243"

.565"

.395"

.399"

5/8", 3/4", 7/8", 1"

3/8-16UNC-2A

.650"

.243"

.565"

.395"

.399"

1/2", 5/8", 3/4", 7/8", 1"

1/2-20UNF-2A

.870"

.323"

.752"

.530"

.534"

1/2", 5/8", 3/4", 7/8", 1",

11/8", 11/4"

1/2-13UNC-2A

.870"

.323"

.752"

.530"

.534"

3/4", 7/8", 1", 11/8", 11/4"

TYPE ST HEXAGON HEAD SEELBOLTS

TYPE ST HEXAGON HEAD SEELBOLTS

THREAD

AN

P

H

Flats

Clear. Hole‡

LENGTHS

SIZE

Equiv.

NOM.

MAX.

MAX.

Min.

Max.

+1/32 – 1/16

1/4-28UNF-3A

AN4C

.510"

.172"

.440"

.265"

.269"

15/32", 17/32", 21/32", 25/32",

29/32", 11⁄32", 15⁄32", 19⁄32"

5/16-24UNF-3A

AN5C

.580"

.204"

.502"

.332"

.336"

19/32", 23/32", 27/32", 31/32"

13⁄32", 17⁄32", 111⁄32", 115⁄32", 119⁄32"

3/8-24UNF-3A

AN6C

.650"

.235"

.565"

.395"

.399"

45/64", 53/64", 61/64", 15⁄64",

113⁄64", 121⁄64", 129⁄64"

TYPE SB & AN SEELBOLTS

TYPE SB AN TYPE SEELBOLTS

Material: SEELSKREWS® and SEELBOLTS® — Non-magnetic stainless steel

(passivated). SEELNUTS® — Brass (nickel-plated) or steel (zinc-plated). Other

materials available on request. Silicone rubber per ZZ-R-765, Class I & II, Grade

70. Other seal materials available. Note: Type SB SEELBOLTS® meet

requirements of MIL-B-6812, material is stainless steel (magnetic).

Threads: Class 2 threads (normal commercial tolerance) are standard on stock

SEELSKREWS®, SEELBOLTS® and SEELNUTS®. Class 1 (loose tolerance) and

Class 3 (tight tolerance) threads are available on special order.

Temperature Range: -160°F to +500°F (-106°C to +260°C).

Pressure Range: Up to 6000 psi/vacuum, internal and external, subject to clearance

hole dimensions. Check factory for test data.

Shelf Life: Excess of 25 years.

Resistant to: Salt water, weather, dirt, dust, sunlight, ozone and most acids. See Table I.

Agency Listings: UL and CSA.

Installation: Install in same manner as standard fasteners. Standard break-edge

practices for deburring (i.e. break-sharp edges of 0.005" maximum) are

permissible. Recommended clearance hole depth is 2 to 3 times thread pitch.

See detail below.

Minimum Thread Length: SEELSKREWS®: For machine screws up to 11⁄4" long,

the complete thread should extend to within two threads (or closer) of the

bearing surface of the head.

SEELBOLTS®: For bolts up to 11⁄4" long, the minimum thread length should be

twice the diameter plus 1/4" (with a tolerance of plus 21⁄2 threads or 3/16",

whichever is greater). For bolts too short for this minimum, the distance from the

bearing surface of the head to the first complete thread shall not exceed the

length of 21⁄2 threads as measured with a ring thread gauge.

SEELSKREW®, SEELBOLT® & SEELNUT® SPECIFICATIONS

SEELSKREWS®: When ordering specify head style, thread size and length.

Examples:

• To order a slotted head SEELSKREW with an 8-32 thread, 1/2" long,

specify: SEELSKREW S8-32 x 1/2"

• To order an oversized slotted head SEELSKREW® with a 4-40 thread, 3/4"

long, specify: SEELSKREW SL 4-40 x 3/4"

• To order a Phillips head SEELSKREW with an M4 metric thread, 12 mm

long, specify: SEELSKREW RM 4 x 12mm

SEELBOLTS®: When ordering specify head style, thread size and length. Examples:

• To order a Type ST SEELBOLT with a 1/2-20UNF thread, 1" long, specify:

SEELBOLT ST 1/2-20UNF x 1"

SEELNUTS®: When ordering specify thread size. Example:

• To order a SEELNUT with an 8-32 thread, specify: SEELNUT 8-32

For non-stock thread sizes/head styles/lengths, or other sealing materials, please

consult the factory. KAPTO-SKREWS® and NYLOK® self-locking inserts are available

on special order.

NYLOK® is a trademark of NYLOK FASTENER CORPORATION.

HOW TO ORDER

4

TYPICAL CLEARANCE

HOLE DETAIL

To assure maximum sealing performance

of SEELSKREWS® and SEELBOLTS®

a clearance hole must be used.

Letter

S

L

V

N

E

F

G

Ozone

Excellent

Excellent

Excellent

Fair

Good

Excellent

Excellent

Chemicals

Good

Good

Excellent

Good

Good

Excellent

Excellent

Oil

Good

Excellent

Excellent

Excellent

Good

Poor

Excellent

Solvents

Fair

Good

Excellent

Good

Fair

Good

Good

Tensile

PSI

500-1800

600-1400

2000-2200

1500-3000

1500-4000

1400-1600

2000

Elongation

%

100-800

100-700

300-400

400-600

100-700

500-600

170

Abrasion

Resistance

Fair

Fair

Good

Good

Excellent

Excellent

Good

Compression

Set

Excellent

Excellent

Excellent

Excellent

Good

Excellent

Excellent

Material

Silicone

Rubber

Fluoro-

Silicone

Rubber

Viton® A

Buna N

(NBR)

Neoprene

(EPR)

Ethylene

Propylene

(EPDM)

Hydro-

genated

Nitrile

Relevant

Specifications

ZZ-R-765

CLASS I & II

GR. 70 RED

MIL-R-25988

AMS 3326

MIL-R-83248

CLASS I GR. 75

ASTM D2000-90

M2BG714

MIL-R-3065

AMS3209

ASTM D2000-90

M3BA708

ASTM D2000-90

M2BG714

(Green)

Service

Temp

°F

–150° to 500°

–78° TO 450°

–20° to 400°

–65° to 250°

–65° to 300°

–65° to 300°

–40° to 275°

RESISTANT TO

TABLE I: O-RING MATERIAL LIST

TYPICAL PROPERTIES

Other materials available. Please consult factory. Viton® is a registered trademark of DuPont Performance Elastomers.

Consult factory for additional sizes.

Consult factory for additional sizes.

Visit our website for downloadable CAD drawings:

www.apmhexseal.com