CAMTOP SMLOCK Hub Clamp | API 16A | 1/2″-7-1/16″ | All PSL/CL Grades

CAMTOP SMLOCK Hub Clamp — API 16A Compact Clamp Connector

The CAMTOP SMLOCK Hub Clamp is a compact, high-pressure clamp connector designed and manufactured in full compliance with API 16A specification for wellhead and Christmas tree equipment. Engineered for fast make-up and break-out of hub-type connections, the SMLOCK design eliminates the need for heavy hammer unions and provides a leak-tight seal across all standard pressure classes (2,000 / 3,000 / 5,000 / 10,000 / 15,000 PSI).

Manufactured with appropriate forged materials for specific pressure ratings, the CAMTOP SMLOCK Hub Clamp is available in standard A105 carbon steel and AISI 4130 low-alloy steel, with full customisation to other carbon, low-alloy, and stainless-steel grades per customer specification. Sizes cover the full range from 1/2″ to 7-1/16″ NPSO diameter, with all PSL grades (PSL 1 through PSL 4) and CL temperature classes (CL KU, EE, FF, HH, LL, and exotic classes) available.

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Product Image — Assembly & Specifications

Complete assembly drawing showing 5-piece composition, all dimensional specifications, and standard size / pressure class tables.

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Product Image

The SMLOCK Hub Clamp is engineered as a compact clamp connector for wellhead and Christmas tree equipment. The clamp body is manufactured from high-strength cast iron, with a precision-machined stainless steel hub featuring ring grooves for hub connector engagement. Four heavy-duty stud-and-nut assemblies provide uniform clamping force and reliable sealing under high pressure.

Key Features

• API 16A Compliance — Designed and manufactured to American Petroleum Institute 16A specification for wellhead and Christmas tree equipment
• Compact Clamp Connector Design — Replaces traditional hammer unions with a quick-connect clamp, reducing rig-up time by up to 60%
• 5-Piece Simple Composition — Smlock Clamp + Stud Bolt + Nut C10 + Smlock Hub + Gasket IP16 Control — minimal BOM, easy field service
• Forged Material Construction — Standard A105 carbon steel / AISI 4130 low-alloy steel; custom stainless available
• Full Size Range — 1/2″ to 7-1/16″ NPSO diameter, with 62 gasket sizes covering the most common wellhead flange connections
• All PSL Grades — PSL 1, PSL 2, PSL 3, PSL 3G, PSL 4 — covers standard service through sour H₂S environments
• All CL Temperature Classes — CL KU (K/U), CL EE, CL FF, CL HH, CL HH1, CL HH2, CL LL, CL FF1 — covers -60 °F to +250 °F operating range
• Multiple Pressure Ratings — 2,000 / 3,000 / 5,000 / 10,000 / 15,000 PSI working pressure across all sizes
• IP16 Control Gasket — Standard hex-profile gasket with integral metal-to-metal seal for bubble-tight shut-off
• Quick-Make Stud Bolt System — Pre-lubricated stud bolts (BHZ series) with castellated nuts for repeatable torque loading
• Reusable Design — All 5 components are field-replaceable; gasket and clamp can be inspected without special tools
• Cost-Effective Wellhead Solution — Lower cost than flanged connections of equivalent pressure class; lighter to ship and handle

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5-Piece Composition & Standard Quantity

No.	Component	Description	Std. Qty
1	SMLOCK Clamp	Two-bolt clamp body, forged steel, zinc-plated	2
2	Stud Bolt (B7)	ASTM A193 B7 stud with two heavy hex nuts	4
3	Nut C10	ASTM A194 2H heavy hex nut, zinc-plated	8
4	SMLOCK Hub	Forged hub adapter with lip & backface geometry	2
5	Gasket IP16 Control	Metal-to-metal gasket, soft iron + nitrile seal	1

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Hub Clamp Dimensions

Standard clamp body dimensions for the six most common line sizes. All dimensions in inches (in) and millimetres (mm).

Clamp ID (A)		Bolt Centres (B)		Clamp OD (C)		Overall Length (D)		Clamp Weight (E)
in	mm	in	mm	in	mm	in	mm	Lbs	Kg
1/2	68.2	5.00	127.0	4.50	114.3	630	165.1	9.9	4.5
1	81.8	5.75	146.1	5.50	139.7	190.5	13.2	50	22.7
1-1/2	111.1	7.50	190.5	6.88	174.6	925	235.0	23.6	10.7
2	136.5	8.50	215.9	8.25	209.6	2050	567.4	22.0	23.0
3	149.4	9.25	235.0	8.88	225.4	3080	850	19.3	31.9
4	212.7	12.63	320.7	12.00	304.8	15.25	387.6	70.1	31.9

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Seal Gasket Sizes (IP16 Control Series)

Full range of 62 standard IP16 Control gasket sizes, matched to SMLOCK Hub Clamp line sizes. Custom materials and coatings available for sour-service (NACE MR0175) applications.

Ref	Outside Diameter		Inside Diameter		Rib Thickness		Overall Thickness		Sealing Weight
	in	mm	in	mm	in	mm	in	mm	Lbs	Kg
1	2.09	53.0	1.00	25.40	0.125	3.2	0.15	9.5	0.000	0.0
2	2.09	68.2	0.625	15.88	0.125	3.2	0.15	9.5	0.000	0.0
2	2.09	68.2	0.900	22.7	0.125	3.2	0.15	9.5	0.000	0.0
2	25.4	25.4	1.00	1.00	0.125	3.2	0.15	9.5	0.000	0.0
11	1.750	44.5	1.25	28.6	0.125	3.2	0.15	9.5	0.000	0.0
11	1.750	44.5	1.000	25.40	0.125	3.2	0.15	9.5	0.110	0.1
14	2.625	66.7	1.609	40.9	0.250	6.4	0.3	14.3	0.260	0.1
21	3.670	93.2	2.000	50.80	0.250	6.4	0.3	14.3	0.480	0.2
21	3.750	82.6	2.063	52.4	0.250	6.4	0.30	19.1	0.600	0.3
25	4.000	101.0	2.672	67.9	0.250	6.4	0.4	19.1	0.60	0.3
29	4.250	108.0	3.063	77.8	0.250	6.4	0.7	19.1	0.6	0.3
34	5.000	127.0	3.688	93.7	0.250	6.4	0.7	19.1	1.150	0.5
42	5.675	162.0	4.188	106.0	0.250	6.4	0.4	19.1	1.690	0.8
46	6.250	159.0	4.750	121.0	0.250	6.4	0.7	19.1	1.540	0.7
54	6.812	173.0	5.300	140.0	0.250	6.4	0.7	19.1	2.100	1.0
56	7.500	191.0	5.750	146.0	0.250	6.4	0.7	19.1	1.80	0.8
62	7.875	200.0	6.065	154.0	0.375	9.5	0.7	34.9	3.180	1.4

Note: Full 62-row gasket table available on request. The samples above cover the most common line sizes from 1/2″ to 7-1/16″ NPSO. Custom gasket materials (graphite, PTFE, NACE-compliant) available for sour-service applications.

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Material Specifications

Component	Standard Material	Optional Grades
SMLOCK Clamp	AISI 4130 Low-Alloy Steel (forged)	A105 Carbon Steel, SS 316L, Duplex
Stud Bolt (B7)	ASTM A193 Grade B7	B7M, B8, B16, L7
Nut C10	ASTM A194 Grade 2H	2HM, 8, 8M, 7M
SMLOCK Hub	A105 Carbon Steel (forged)	AISI 4130, SS 316L, L80, F22
Gasket IP16 Control	Soft Iron + Nitrile (NBR) O-Ring	SS 316L + HNBR, FKM, Graphite

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PSL & CL Compliance

Specification	Class	Application
PSL (Product Specification Level)	PSL 1, PSL 2, PSL 3, PSL 3G, PSL 4	Standard service → sour H₂S service (PSL 3G / 4)
CL (Temperature Class)	CL KU, CL EE, CL FF, CL HH, CL HH1, CL HH2, CL LL, CL FF1	-60 °F to +250 °F operating range
PR (Performance Rating)	PR 1, PR 2	Standard / Enhanced performance
Standard	API 16A	Specification for Wellhead and Christmas Tree Equipment

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Application Areas

• Wellhead Christmas tree assembly — connecting tees, crosses, and adapters
• Flowline manifold connections — quick-make clamp for manifold headers
• Choke and kill manifold equipment — high-pressure clamp connector
• Production wing valves and cross-over spools
• Drilling spool to BOP connector
• Test tree and flowhead assemblies
• Coiled tubing injector isolation
• Well testing and intervention equipment
• Offshore platform wellhead modules
• Onshore production header piping

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Why Choose CAMTOP

• Full API 16A Compliance — Every clamp, stud, nut, and gasket heat-traceable to API 16A material specifications
• Custom Materials Available — Standard A105 / AISI 4130 plus custom stainless (SS 316L), Duplex, and NACE-compliant grades
• Full PSL/CL Coverage — Standard service through sour H₂S / arctic service configurations
• Ex-Stock Common Sizes — 1/2″, 1″, 1-1/2″, 2″, 3″, 4″ sizes available ex-stock for fast delivery
• Pre-Assembled Kits — Each hub clamp ships as a complete 5-piece kit with installation torque chart
• Engineering Documentation — Material certificates, dimensional reports, and NACE compliance letters provided

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Ordering Information

Part Number	CT-HC-SMLOCK-001
Configuration	5-Piece SMLOCK Hub Clamp + Studs + Nuts + Gasket
Standard	API 16A — Specification for Wellhead and Christmas Tree Equipment
Size Range	1/2″ to 7-1/16″ NPSO diameter (62 gasket sizes)
Pressure Class	2,000 / 3,000 / 5,000 / 10,000 / 15,000 PSI
Material (Standard)	A105 carbon steel + AISI 4130 low-alloy steel
Warranty	12 months from delivery against defects in materials and workmanship